springboot无参构造器方法 spring 有参构造器注解

Spring是如何解析有参构造器的？

 

在前面的章节，笔者对SpringIOC的源码做了详细的介绍，但跳过了一个地方，因为通常情况下，我们的对象是只会包含默认的构造器，不会采用有参构造器，而且就算是有参构造器也都停留在XML的阶段里，因此笔者直接将特殊的情况直接跳过了，一来是Spring在处理有参构造器时较为复杂，笔者本来是不打算介绍的，但考虑到如果读者有好奇心想要去深入了解，因此笔者在这里对SpringIOC的源码在做一些补充吧。提示：对于本章的学习，读者一定要熟悉SpringIOC的源码，不然会一脸懵逼。

我们先回顾下以前的文章

在本章中，笔者介绍了Spring创建对象的详细过程，但并没有提到Spring在处理有参构造器的时候是如何处理的

这里我们用案例简单回顾下我们的问题吧，创建一个类

package com;


import org.springframework.stereotype.Component;

@Component
public class MutipleConstructs {


  private Integer id;

  private String name;

  public MutipleConstructs() {
    System.out.printf("MutipleConstructs");
  }


  public MutipleConstructs(Integer id) {
    System.out.printf("MutipleConstructs参数:"+id);
    this.id = id;
  }

  public MutipleConstructs(Integer id, String name) {
    System.out.printf("MutipleConstructs参数:"+id+","+name);
    this.id = id;
    this.name = name;
  }

  public Integer getId() {
    return id;
  }

  public void setId(Integer id) {
    this.id = id;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }
}

然后还是同样的配置类

import com.MyAutowired;
import com.MyImportBeanDefinitionRegistrar;

import org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor;
import org.springframework.context.annotation.*;

import java.lang.annotation.Annotation;
import java.util.LinkedHashSet;
import java.util.Set;

import static java.util.Arrays.asList;
import static org.springframework.context.annotation.AnnotationConfigUtils.AUTOWIRED_ANNOTATION_PROCESSOR_BEAN_NAME;

@Configuration
@ComponentScan("com")
/*@EnableAspectJAutoProxy*/
/*@Import(MyImportBeanDefinitionRegistrar.class)*/
public class AppConfig {


  //AutowiredAnnotationBeanPostProcessor
  /*@Bean*//*(name = AUTOWIRED_ANNOTATION_PROCESSOR_BEAN_NAME)*//*
  public AutowiredAnnotationBeanPostProcessor autowiredAnnotationBeanPostProcessor(){
    AutowiredAnnotationBeanPostProcessor beanPostProcessor=
        new AutowiredAnnotationBeanPostProcessor();
    Set<Class<? extends Annotation>> autowiredAnnotationTypes
        =new LinkedHashSet<>(asList(MyAutowired.class));
    beanPostProcessor.setAutowiredAnnotationTypes(autowiredAnnotationTypes);
    return beanPostProcessor;
  }*/

}

测试类

import org.springframework.context.annotation.AnnotationConfigApplicationContext;


public class Test {


    public static void main(String[] args) {

      AnnotationConfigApplicationContext annotationConfigApplicationContext=
          new AnnotationConfigApplicationContext(AppConfig.class);
      /*String[] strings=annotationConfigApplicationContext.getBeanDefinitionNames();
      for (String string : strings) {
        System.out.println(string);
      }*/

    }
}

我们查看执行结果

"C:\Program Files\Java\jdk1.8.0_201\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2018.3.5\lib\idea_rt.jar=52021:C:\Program Files\JetBrains\IntelliJ IDEA 2018.3.5\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_201\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\resources.jar;C:\Program 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ar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.eclipse.jetty\jetty-util\9.4.25.v20191220\fd8b642cc16728f1c36ca6a64653cb1b26ec0232\jetty-util-9.4.25.v20191220.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.webjars\webjars-locator-core\0.37\cc422f6cceec523b52d0abc6cff42e3f22d3d2ca\webjars-locator-core-0.37.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\javax.servlet\javax.servlet-api\4.0.1\a27082684a2ff0bf397666c3943496c44541d1ca\javax.servlet-api-4.0.1.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\javax.servlet.jsp.jstl\javax.servlet.jsp.jstl-api\1.2.1\f072f63ab1689e885ac40c221df3e6bb3e64a84a\javax.servlet.jsp.jstl-api-1.2.1.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-request-freemarker\1.0.7\cf75182100f643bf32e063c83dc1d8e0bfc258b7\tiles-request-freemarker-1.0.7.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-compat\3.0.8\8890ecc25134919e03a4f15b41e83ee5335f7beb\tiles-compat-3.0.8.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-el\3.0.8\d006d8201c7d9cee6c679ef0b0911ce35ced9187\tiles-el-3.0.8.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-request-jsp\1.0.7\6a9bde44749334e9ef85d0bdf854ff20641c113\tiles-request-jsp-1.0.7.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-request-servlet-wildcard\1.0.7\2b151fbe0d3c4b0d3cd6b804b30002a878189b74\tiles-request-servlet-wildcard-1.0.7.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-request-velocity\1.0.7\a79b6608238a31ee8b3ffabff824daed7df5251c\tiles-request-velocity-1.0.7.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-request-servlet\1.0.7\e9b9e3cda2a489b3292ed3a15a558b2b57ad0940\tiles-request-servlet-1.0.7.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-request-api\1.0.7\c649a9be6df263c888a2195447cd602d530cc233\tiles-request-api-1.0.7.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.commons\commons-lang3\3.8.1\6505a72a097d9270f7a9e7bf42c4238283247755\commons-lang3-3.8.1.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.commons\commons-compress\1.19\7e65777fb451ddab6a9c054beb879e521b7eab78\commons-compress-1.19.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\com.github.albfernandez\juniversalchardet\2.3.0\48441094fd92f5eb5d60ab0193a76151ebd48633\juniversalchardet-2.3.0.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\com.github.virtuald\curvesapi\1.06\159dd2e8956459a4eb0a9a6ecda9004d8d289708\curvesapi-1.06.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\com.fasterxml.woodstox\woodstox-core\5.1.0\bd416e84cbd20cb5f2cf13c30b023e814a4d6107\woodstox-core-5.1.0.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.codehaus.woodstox\stax2-api\4.1\b6e20f3760016b70358e9227be904ecb26a50530\stax2-api-4.1.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\commons-codec\commons-codec\1.13\3f18e1aa31031d89db6f01ba05d501258ce69d2c\commons-codec-1.13.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.commons\commons-collections4\4.4\62ebe7544cb7164d87e0637a2a6a2bdc981395e8\commons-collections4-4.4.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.commons\commons-math3\3.6.1\e4ba98f1d4b3c80ec46392f25e094a6a2e58fcbf\commons-math3-3.6.1.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.xmlbeans\xmlbeans\3.1.0\6dac1f897dfb3e3f17fc79b18a3353b2e51c464e\xmlbeans-3.1.0.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\commons-beanutils\commons-beanutils\1.8.0\c651d5103c649c12b20d53731643e5fffceb536\commons-beanutils-1.8.0.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-autotag-core-runtime\1.2\100bd3cae1a5debf9afb4ef5c8b36c508d06326\tiles-autotag-core-runtime-1.2.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.mvel\mvel2\2.0.11\14bb21dabd899d2e60d9c0d008f267ed0d6c9ea8\mvel2-2.0.11.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\com.google.code.findbugs\jsr305\1.3.9\40719ea6961c0cb6afaeb6a921eaa1f6afd4cfdf\jsr305-1.3.9.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\commons-collections\commons-collections\3.2.1\761ea405b9b37ced573d2df0d1e3a4e0f9edc668\commons-collections-3.2.1.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\oro\oro\2.0.8\5592374f834645c4ae250f4c9fbb314c9369d698\oro-2.0.8.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\jboss\javassist\3.7.ga\6d271a67a1d8718bfb225ace5a25f1c09427c9f8\javassist-3.7.ga.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\commons-lang\commons-lang\2.4\16313e02a793435009f1e458fa4af5d879f6fb11\commons-lang-2.4.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tomcat.embed\tomcat-embed-jasper\8.5.5\4dba14bb5d4d68460461285ecb60e57668b154f\tomcat-embed-jasper-8.5.5.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tomcat.embed\tomcat-embed-core\8.5.5\d55e12a418ff99ecd723a118c2a28bb91079972d\tomcat-embed-core-8.5.5.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tomcat.embed\tomcat-embed-el\8.5.5\54bd595afa6e4fd141c70fb2d1cecacf4bd11e53\tomcat-embed-el-8.5.5.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.eclipse.jdt.core.compiler\ecj\4.5.1\bee1367ac12fb6a20b422ff8711ebeb4f0a42316\ecj-4.5.1.jar" Test
ERROR StatusLogger Log4j2 could not find a logging implementation. Please add log4j-core to the classpath. Using SimpleLogger to log to the console...
MutipleConstructs
Process finished with exit code 0

可以看到这里打印了日志MutipleConstructs，说明我们创建了多个构造器，却依旧执行了默认构造器，如果我们修改下这个类MutipleConstructs

package com;


import org.springframework.stereotype.Component;

@Component
public class MutipleConstructs {


  private Integer id;

  private String name;

/*  public MutipleConstructs() {
    System.out.printf("MutipleConstructs");
  }*/


  public MutipleConstructs(Integer id) {
    System.out.printf("MutipleConstructs参数:"+id);
    this.id = id;
  }

  public MutipleConstructs(Integer id, String name) {
    System.out.printf("MutipleConstructs参数:"+id+","+name);
    this.id = id;
    this.name = name;
  }

  public Integer getId() {
    return id;
  }

  public void setId(Integer id) {
    this.id = id;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }
}

再次执行

"C:\Program Files\Java\jdk1.8.0_201\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2018.3.5\lib\idea_rt.jar=52054:C:\Program Files\JetBrains\IntelliJ IDEA 2018.3.5\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_201\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunmscapi.jar;C:\Program 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ar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.eclipse.jetty\jetty-util\9.4.25.v20191220\fd8b642cc16728f1c36ca6a64653cb1b26ec0232\jetty-util-9.4.25.v20191220.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.webjars\webjars-locator-core\0.37\cc422f6cceec523b52d0abc6cff42e3f22d3d2ca\webjars-locator-core-0.37.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\javax.servlet\javax.servlet-api\4.0.1\a27082684a2ff0bf397666c3943496c44541d1ca\javax.servlet-api-4.0.1.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\javax.servlet.jsp.jstl\javax.servlet.jsp.jstl-api\1.2.1\f072f63ab1689e885ac40c221df3e6bb3e64a84a\javax.servlet.jsp.jstl-api-1.2.1.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-request-freemarker\1.0.7\cf75182100f643bf32e063c83dc1d8e0bfc258b7\tiles-request-freemarker-1.0.7.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-compat\3.0.8\8890ecc25134919e03a4f15b41e83ee5335f7beb\tiles-compat-3.0.8.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-el\3.0.8\d006d8201c7d9cee6c679ef0b0911ce35ced9187\tiles-el-3.0.8.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-request-jsp\1.0.7\6a9bde44749334e9ef85d0bdf854ff20641c113\tiles-request-jsp-1.0.7.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-request-servlet-wildcard\1.0.7\2b151fbe0d3c4b0d3cd6b804b30002a878189b74\tiles-request-servlet-wildcard-1.0.7.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-request-velocity\1.0.7\a79b6608238a31ee8b3ffabff824daed7df5251c\tiles-request-velocity-1.0.7.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-request-servlet\1.0.7\e9b9e3cda2a489b3292ed3a15a558b2b57ad0940\tiles-request-servlet-1.0.7.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-request-api\1.0.7\c649a9be6df263c888a2195447cd602d530cc233\tiles-request-api-1.0.7.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.commons\commons-lang3\3.8.1\6505a72a097d9270f7a9e7bf42c4238283247755\commons-lang3-3.8.1.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.commons\commons-compress\1.19\7e65777fb451ddab6a9c054beb879e521b7eab78\commons-compress-1.19.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\com.github.albfernandez\juniversalchardet\2.3.0\48441094fd92f5eb5d60ab0193a76151ebd48633\juniversalchardet-2.3.0.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\com.github.virtuald\curvesapi\1.06\159dd2e8956459a4eb0a9a6ecda9004d8d289708\curvesapi-1.06.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\com.fasterxml.woodstox\woodstox-core\5.1.0\bd416e84cbd20cb5f2cf13c30b023e814a4d6107\woodstox-core-5.1.0.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.codehaus.woodstox\stax2-api\4.1\b6e20f3760016b70358e9227be904ecb26a50530\stax2-api-4.1.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\commons-codec\commons-codec\1.13\3f18e1aa31031d89db6f01ba05d501258ce69d2c\commons-codec-1.13.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.commons\commons-collections4\4.4\62ebe7544cb7164d87e0637a2a6a2bdc981395e8\commons-collections4-4.4.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.commons\commons-math3\3.6.1\e4ba98f1d4b3c80ec46392f25e094a6a2e58fcbf\commons-math3-3.6.1.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.xmlbeans\xmlbeans\3.1.0\6dac1f897dfb3e3f17fc79b18a3353b2e51c464e\xmlbeans-3.1.0.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\commons-beanutils\commons-beanutils\1.8.0\c651d5103c649c12b20d53731643e5fffceb536\commons-beanutils-1.8.0.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-autotag-core-runtime\1.2\100bd3cae1a5debf9afb4ef5c8b36c508d06326\tiles-autotag-core-runtime-1.2.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.mvel\mvel2\2.0.11\14bb21dabd899d2e60d9c0d008f267ed0d6c9ea8\mvel2-2.0.11.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\com.google.code.findbugs\jsr305\1.3.9\40719ea6961c0cb6afaeb6a921eaa1f6afd4cfdf\jsr305-1.3.9.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\commons-collections\commons-collections\3.2.1\761ea405b9b37ced573d2df0d1e3a4e0f9edc668\commons-collections-3.2.1.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\oro\oro\2.0.8\5592374f834645c4ae250f4c9fbb314c9369d698\oro-2.0.8.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\jboss\javassist\3.7.ga\6d271a67a1d8718bfb225ace5a25f1c09427c9f8\javassist-3.7.ga.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\commons-lang\commons-lang\2.4\16313e02a793435009f1e458fa4af5d879f6fb11\commons-lang-2.4.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tomcat.embed\tomcat-embed-jasper\8.5.5\4dba14bb5d4d68460461285ecb60e57668b154f\tomcat-embed-jasper-8.5.5.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tomcat.embed\tomcat-embed-core\8.5.5\d55e12a418ff99ecd723a118c2a28bb91079972d\tomcat-embed-core-8.5.5.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tomcat.embed\tomcat-embed-el\8.5.5\54bd595afa6e4fd141c70fb2d1cecacf4bd11e53\tomcat-embed-el-8.5.5.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.eclipse.jdt.core.compiler\ecj\4.5.1\bee1367ac12fb6a20b422ff8711ebeb4f0a42316\ecj-4.5.1.jar" Test
ERROR StatusLogger Log4j2 could not find a logging implementation. Please add log4j-core to the classpath. Using SimpleLogger to log to the console...
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mutipleConstructs' defined in file [E:\spring-framework-5.1.x\qitian0-Test\out\production\classes\com\MutipleConstructs.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.MutipleConstructs]: No default constructor found; nested exception is java.lang.NoSuchMethodException: com.MutipleConstructs.<init>()
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1322)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1213)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:559)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:518)
  at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:321)
  at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
  at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:319)
  at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
  at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:848)
  at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:892)
  at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:556)
  at org.springframework.context.annotation.AnnotationConfigApplicationContext.<init>(AnnotationConfigApplicationContext.java:100)
  at Test.main(Test.java:10)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.MutipleConstructs]: No default constructor found; nested exception is java.lang.NoSuchMethodException: com.MutipleConstructs.<init>()
  at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:83)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1314)
  ... 12 more
Caused by: java.lang.NoSuchMethodException: com.MutipleConstructs.<init>()
  at java.lang.Class.getConstructor0(Class.java:3082)
  at java.lang.Class.getDeclaredConstructor(Class.java:2178)
  at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:78)
  ... 13 more

Process finished with exit code 1

注意这里的异常信息，它是说有参构造器太多，不能确认是哪一个使我们想要的，这是构造器决策失败的异常，我们再来修改下代码

package com;


import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;

@Component
public class MutipleConstructs {


  private Integer id;

  private String name;

/*  public MutipleConstructs() {
    System.out.printf("MutipleConstructs");
  }*/

    public MutipleConstructs(Integer id) {
    System.out.printf("MutipleConstructs参数:"+id);
    this.id = id;
  }

  /*public MutipleConstructs(Integer id, String name) {
    System.out.printf("MutipleConstructs参数:"+id+","+name);
    this.id = id;
    this.name = name;
  }*/

  public Integer getId() {
    return id;
  }

  public void setId(Integer id) {
    this.id = id;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }
}

然后我们再来测试下

"C:\Program Files\Java\jdk1.8.0_201\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2018.3.5\lib\idea_rt.jar=52079:C:\Program Files\JetBrains\IntelliJ IDEA 2018.3.5\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_201\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\resources.jar;C:\Program 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ar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.eclipse.jetty\jetty-util\9.4.25.v20191220\fd8b642cc16728f1c36ca6a64653cb1b26ec0232\jetty-util-9.4.25.v20191220.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.webjars\webjars-locator-core\0.37\cc422f6cceec523b52d0abc6cff42e3f22d3d2ca\webjars-locator-core-0.37.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\javax.servlet\javax.servlet-api\4.0.1\a27082684a2ff0bf397666c3943496c44541d1ca\javax.servlet-api-4.0.1.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\javax.servlet.jsp.jstl\javax.servlet.jsp.jstl-api\1.2.1\f072f63ab1689e885ac40c221df3e6bb3e64a84a\javax.servlet.jsp.jstl-api-1.2.1.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-request-freemarker\1.0.7\cf75182100f643bf32e063c83dc1d8e0bfc258b7\tiles-request-freemarker-1.0.7.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-compat\3.0.8\8890ecc25134919e03a4f15b41e83ee5335f7beb\tiles-compat-3.0.8.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-el\3.0.8\d006d8201c7d9cee6c679ef0b0911ce35ced9187\tiles-el-3.0.8.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-request-jsp\1.0.7\6a9bde44749334e9ef85d0bdf854ff20641c113\tiles-request-jsp-1.0.7.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-request-servlet-wildcard\1.0.7\2b151fbe0d3c4b0d3cd6b804b30002a878189b74\tiles-request-servlet-wildcard-1.0.7.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-request-velocity\1.0.7\a79b6608238a31ee8b3ffabff824daed7df5251c\tiles-request-velocity-1.0.7.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-request-servlet\1.0.7\e9b9e3cda2a489b3292ed3a15a558b2b57ad0940\tiles-request-servlet-1.0.7.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-request-api\1.0.7\c649a9be6df263c888a2195447cd602d530cc233\tiles-request-api-1.0.7.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.commons\commons-lang3\3.8.1\6505a72a097d9270f7a9e7bf42c4238283247755\commons-lang3-3.8.1.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.commons\commons-compress\1.19\7e65777fb451ddab6a9c054beb879e521b7eab78\commons-compress-1.19.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\com.github.albfernandez\juniversalchardet\2.3.0\48441094fd92f5eb5d60ab0193a76151ebd48633\juniversalchardet-2.3.0.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\com.github.virtuald\curvesapi\1.06\159dd2e8956459a4eb0a9a6ecda9004d8d289708\curvesapi-1.06.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\com.fasterxml.woodstox\woodstox-core\5.1.0\bd416e84cbd20cb5f2cf13c30b023e814a4d6107\woodstox-core-5.1.0.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.codehaus.woodstox\stax2-api\4.1\b6e20f3760016b70358e9227be904ecb26a50530\stax2-api-4.1.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\commons-codec\commons-codec\1.13\3f18e1aa31031d89db6f01ba05d501258ce69d2c\commons-codec-1.13.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.commons\commons-collections4\4.4\62ebe7544cb7164d87e0637a2a6a2bdc981395e8\commons-collections4-4.4.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.commons\commons-math3\3.6.1\e4ba98f1d4b3c80ec46392f25e094a6a2e58fcbf\commons-math3-3.6.1.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.xmlbeans\xmlbeans\3.1.0\6dac1f897dfb3e3f17fc79b18a3353b2e51c464e\xmlbeans-3.1.0.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\commons-beanutils\commons-beanutils\1.8.0\c651d5103c649c12b20d53731643e5fffceb536\commons-beanutils-1.8.0.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tiles\tiles-autotag-core-runtime\1.2\100bd3cae1a5debf9afb4ef5c8b36c508d06326\tiles-autotag-core-runtime-1.2.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.mvel\mvel2\2.0.11\14bb21dabd899d2e60d9c0d008f267ed0d6c9ea8\mvel2-2.0.11.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\com.google.code.findbugs\jsr305\1.3.9\40719ea6961c0cb6afaeb6a921eaa1f6afd4cfdf\jsr305-1.3.9.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\commons-collections\commons-collections\3.2.1\761ea405b9b37ced573d2df0d1e3a4e0f9edc668\commons-collections-3.2.1.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\oro\oro\2.0.8\5592374f834645c4ae250f4c9fbb314c9369d698\oro-2.0.8.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\jboss\javassist\3.7.ga\6d271a67a1d8718bfb225ace5a25f1c09427c9f8\javassist-3.7.ga.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\commons-lang\commons-lang\2.4\16313e02a793435009f1e458fa4af5d879f6fb11\commons-lang-2.4.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tomcat.embed\tomcat-embed-jasper\8.5.5\4dba14bb5d4d68460461285ecb60e57668b154f\tomcat-embed-jasper-8.5.5.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tomcat.embed\tomcat-embed-core\8.5.5\d55e12a418ff99ecd723a118c2a28bb91079972d\tomcat-embed-core-8.5.5.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.apache.tomcat.embed\tomcat-embed-el\8.5.5\54bd595afa6e4fd141c70fb2d1cecacf4bd11e53\tomcat-embed-el-8.5.5.jar;C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\org.eclipse.jdt.core.compiler\ecj\4.5.1\bee1367ac12fb6a20b422ff8711ebeb4f0a42316\ecj-4.5.1.jar" Test
ERROR StatusLogger Log4j2 could not find a logging implementation. Please add log4j-core to the classpath. Using SimpleLogger to log to the console...
Exception in thread "main" org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'mutipleConstructs' defined in file [E:\spring-framework-5.1.x\qitian0-Test\out\production\classes\com\MutipleConstructs.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'java.lang.Integer' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
  at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:787)
  at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:236)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1360)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1202)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:559)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:518)
  at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:321)
  at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
  at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:319)
  at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
  at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:848)
  at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:892)
  at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:556)
  at org.springframework.context.annotation.AnnotationConfigApplicationContext.<init>(AnnotationConfigApplicationContext.java:100)
  at Test.main(Test.java:10)
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'java.lang.Integer' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
  at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1664)
  at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1222)
  at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1176)
  at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:875)
  at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:778)
  ... 14 more

Process finished with exit code 1

这里的异常信息就不一样了，我们再看下debug信息

可以看到这里的决策已经有结果了，而这里返回的结果信息就是我们定义的那个有参构造器，我们跟进去，然后最跟踪到

再进入

我们把代码贴出来，可以看到这个代码很长很长，相信读者也没有耐心看完，我就长话短说了

public BeanWrapper autowireConstructor(String beanName, RootBeanDefinition mbd,
      @Nullable Constructor<?>[] chosenCtors, @Nullable Object[] explicitArgs) {

    BeanWrapperImpl bw = new BeanWrapperImpl();
    this.beanFactory.initBeanWrapper(bw);
    //constructorToUse 要使用的构造方法，argsHolderToUse要使用的参数，拿到这些就可以创建bean了
    Constructor<?> constructorToUse = null;
    ArgumentsHolder argsHolderToUse = null;
    Object[] argsToUse = null;
        //如果确认了构造的参数，直接设置
    if (explicitArgs != null) {
      argsToUse = explicitArgs;
    }
    else {
      Object[] argsToResolve = null;
      synchronized (mbd.constructorArgumentLock) {
        constructorToUse = (Constructor<?>) mbd.resolvedConstructorOrFactoryMethod;
        if (constructorToUse != null && mbd.constructorArgumentsResolved) {
          // Found a cached constructor...
          argsToUse = mbd.resolvedConstructorArguments;
          if (argsToUse == null) {
            argsToResolve = mbd.preparedConstructorArguments;
          }
        }
      }
      if (argsToResolve != null) {
        argsToUse = resolvePreparedArguments(beanName, mbd, bw, constructorToUse, argsToResolve, true);
      }
    }

    if (constructorToUse == null || argsToUse == null) {
      // 上面是尝试从mbd.resolvedConstructorOrFactoryMethod拿一次，看能不能拿到，如果拿不到，就从参数拿
      Constructor<?>[] candidates = chosenCtors;
      //如果candidates为空，spring会认为自己判断有误，否认自己之前拿到构造器的模式，
      // 进行更加严谨的方式去重新拿构造方法
      if (candidates == null) {
        Class<?> beanClass = mbd.getBeanClass();
        try {
          candidates = (mbd.isNonPublicAccessAllowed() ?
              beanClass.getDeclaredConstructors() : beanClass.getConstructors());
        }
        catch (Throwable ex) {
          throw new BeanCreationException(mbd.getResourceDescription(), beanName,
              "Resolution of declared constructors on bean Class [" + beanClass.getName() +
              "] from ClassLoader [" + beanClass.getClassLoader() + "] failed", ex);
        }
      }
            //如果candidates.length == 1，表示spring已经确认了构造函数，这里并没有拿到具体的值，所以Spring会判断是不是无参构造处理，如果是就返回
      if (candidates.length == 1 && explicitArgs == null && !mbd.hasConstructorArgumentValues()) {
        Constructor<?> uniqueCandidate = candidates[0];
        if (uniqueCandidate.getParameterCount() == 0) {
          synchronized (mbd.constructorArgumentLock) {
            mbd.resolvedConstructorOrFactoryMethod = uniqueCandidate;
            mbd.constructorArgumentsResolved = true;
            mbd.resolvedConstructorArguments = EMPTY_ARGS;
          }
          bw.setBeanInstance(instantiate(beanName, mbd, uniqueCandidate, EMPTY_ARGS));
          return bw;
        }
      }



      boolean autowiring = (chosenCtors != null ||
          mbd.getResolvedAutowireMode() == AutowireCapableBeanFactory.AUTOWIRE_CONSTRUCTOR);
      ConstructorArgumentValues resolvedValues = null;
            //最小参数
      int minNrOfArgs;
      if (explicitArgs != null) {
        minNrOfArgs = explicitArgs.length;
      }
      else {
        //这里有Map也有List，表示可能会采用两种方式，比如会设置有序的就采用map
        //这里的cargs是用来装程序员配置的参数
        /*if(beanName.equals("user1")){
          mbd.getConstructorArgumentValues().addGenericArgumentValue("1","dsadasdsa");
        }*/
        ConstructorArgumentValues cargs = mbd.getConstructorArgumentValues();
        //这里的resolvedValues是用来合并两种参数
        resolvedValues = new ConstructorArgumentValues();
        //这里是spring获取对构造方法设置的最小参数
        //比如通过Spring的后置处理器使用（bd.getConstructorArgumentValues().addGenericArgumentValue）
        //参考MyImportBeanDefinitionRegistrar这个类
        minNrOfArgs = resolveConstructorArguments(beanName, mbd, bw, cargs, resolvedValues);
      }
            //这里的排序是对配合后面对参数选举的铺垫
      AutowireUtils.sortConstructors(candidates);
      //定义一个最大值
      int minTypeDiffWeight = Integer.MAX_VALUE;
      //存放需要排除的构造器
      Set<Constructor<?>> ambiguousConstructors = null;
      LinkedList<UnsatisfiedDependencyException> causes = null;
            //循环构造器
      for (Constructor<?> candidate : candidates) {
        Class<?>[] paramTypes = candidate.getParameterTypes();
                //当constructorToUse != null成立的时候会有这个argsToUse.length > paramTypes.length，这里就要回到排序了
        //排序后参数会3-》2-》1这样排序，如果有了3，来了一个2比较，那么spring就会认为不需要再进行处理了
        if (constructorToUse != null && argsToUse != null && argsToUse.length > paramTypes.length) {
          // Already found greedy constructor that can be satisfied ->
          // do not look any further, there are only less greedy constructors left.
          break;
        }
        // 这里的判断很重要，minNrOfArgs = resolveConstructorArguments(beanName, mbd, bw, cargs, resolvedValues);
        // 判断是如果这个构造方法的参数比我们对spring设置的参数还小，那么肯定是有问题的，会直接跳过
        if (paramTypes.length < minNrOfArgs) {
          continue;
        }

        ArgumentsHolder argsHolder;
        if (resolvedValues != null) {
          try {
            String[] paramNames = ConstructorPropertiesChecker.evaluate(candidate, paramTypes.length);
            if (paramNames == null) {
              ParameterNameDiscoverer pnd = this.beanFactory.getParameterNameDiscoverer();
              if (pnd != null) {
                paramNames = pnd.getParameterNames(candidate);
              }
            }
            //这里如果拿不到resolvedValues的值，spring会找不到匹配的类来对应，就会抛出异常
            argsHolder = createArgumentArray(beanName, mbd, resolvedValues, bw, paramTypes, paramNames,
                getUserDeclaredConstructor(candidate), autowiring, candidates.length == 1);
          }
          catch (UnsatisfiedDependencyException ex) {
            if (logger.isTraceEnabled()) {
              logger.trace("Ignoring constructor [" + candidate + "] of bean '" + beanName + "': " + ex);
            }
            // Swallow and try next constructor.
            if (causes == null) {
              causes = new LinkedList<>();
            }
            causes.add(ex);
            continue;
          }
        }
        else {
          // Explicit arguments given -> arguments length must match exactly.
          if (paramTypes.length != explicitArgs.length) {
            continue;
          }
          argsHolder = new ArgumentsHolder(explicitArgs);
        }

        int typeDiffWeight = (mbd.isLenientConstructorResolution() ?
            argsHolder.getTypeDifferenceWeight(paramTypes) : argsHolder.getAssignabilityWeight(paramTypes));
        // Choose this constructor if it represents the closest match.
        if (typeDiffWeight < minTypeDiffWeight) {
          constructorToUse = candidate;
          argsHolderToUse = argsHolder;
          argsToUse = argsHolder.arguments;
          minTypeDiffWeight = typeDiffWeight;
          ambiguousConstructors = null;
        }
        else if (constructorToUse != null && typeDiffWeight == minTypeDiffWeight) {
          if (ambiguousConstructors == null) {
            ambiguousConstructors = new LinkedHashSet<>();
            ambiguousConstructors.add(constructorToUse);
          }
          ambiguousConstructors.add(candidate);
        }
      }

      if (constructorToUse == null) {
        if (causes != null) {
          UnsatisfiedDependencyException ex = causes.removeLast();
          for (Exception cause : causes) {
            this.beanFactory.onSuppressedException(cause);
          }
          throw ex;
        }
        throw new BeanCreationException(mbd.getResourceDescription(), beanName,
            "Could not resolve matching constructor " +
            "(hint: specify index/type/name arguments for simple parameters to avoid type ambiguities)");
      }
      else if (ambiguousConstructors != null && !mbd.isLenientConstructorResolution()) {
        throw new BeanCreationException(mbd.getResourceDescription(), beanName,
            "Ambiguous constructor matches found in bean '" + beanName + "' " +
            "(hint: specify index/type/name arguments for simple parameters to avoid type ambiguities): " +
            ambiguousConstructors);
      }

      if (explicitArgs == null && argsHolderToUse != null) {
        argsHolderToUse.storeCache(mbd, constructorToUse);
      }
    }

    Assert.state(argsToUse != null, "Unresolved constructor arguments");
    bw.setBeanInstance(instantiate(beanName, mbd, constructorToUse, argsToUse));
    return bw;
  }

我们记住这里我们已经获取了有参构造器，那么是不是要根据有参构造器来执行对象创建了？没错，那么既然确定了构造器，那我们还缺少什么？参数是吧，那么我们就应该确定参数的值是多少，那么Spring从哪里获取的参数值呢？注意是参数值是指参数的具体值

我们可以很清晰的看到，这里就是获取参数的值，这里笔者还修改了做验证，笔者也可以尝试，其实就对ConstructorArgumentValues进行赋值和取值，这里笔者在spring-myabtis的章节做了非常详细的介绍，在看后面的代码

这里是正对多种情况，如果前面的构造器策略返回的是多个构造器，这里就会再次确认，并且做一个排序，从参数多的构造器进行校验，看是不是符合，如果不符合就不再校验。最后

如果构造器确认了，但是没有获取参数的值，就会抛出我们上文提的异常

Unsatisfied dependency expressed through constructor parameter 0;

当然这段代码还不止这些东西，后面还定义了最大值还进行赋值等等，但核心思想就是笔者前面所提及的内容了，OK，本章就算是对SpringIOC源码的关门章节了，愿我们每天都能进步一点点。