问题说明:

新建一个Spring项目,新建一个Bean类:HelloWorld类,Main.java是主程序,xml是Spring配置文件。

项目结构如下:

Spring报错:java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist_java

 

打开文件夹,src目录下的结构如下: 

Spring报错:java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist_java_02

 

打开bin文件夹,目录如下

Spring报错:java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist_xml_03

 

HelloWorld.java代码:



Spring报错:java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist_xml_04

1 package com.tt.spring.beans;
2
3 public class HelloWorld {
4
5 private String name;
6
7 public void setName(String name) {
8 this.name = name;
9 }
10
11 public void hello(){
12 System.out.println("hello: "+name);
13 }
14
15 }


Spring报错:java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist_xml_04


Main.java



Spring报错:java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist_xml_04

1 package com.tt.spring.beans;
2
3 import org.springframework.context.ApplicationContext;
4 import org.springframework.context.support.ClassPathXmlApplicationContext;
5
6 public class Main {
7
8 public static void main(String[] args){
9 /*
10 //创建HelloWorld的一个对象
11 HelloWorld helloWorld = new HelloWorld();
12 //为name属性赋值
13 helloWorld.setName("tt");
14 */
15 //调用hello方法
16
17 //1.创建Spring 的 IOC 容器对象
18 ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
19
20 //2.从IOC容器中获取Bean实例
21 HelloWorld helloWorld = (HelloWorld) ctx.getBean("helloWorld");
22
23 //3.调用Hello方法
24 helloWorld.hello();
25
26 }
27 }


Spring报错:java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist_xml_04


applicationContext.xml:



Spring报错:java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist_xml_04

1 <?xml version="1.0" encoding="UTF-8"?>
2 <beans xmlns="http://www.springframework.org/schema/beans"
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4 xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
5
6 <!-- 配置bean -->
7 <bean id="helloWorld" class="com.tt.spring.beans.HelloWorld">
8 <property name="name" value="Spring"></property>
9 </bean>
10 </beans>


Spring报错:java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist_xml_04


运行Main.java程序,结果显示报错。报错如下:

信息: Loading XML bean definitions from class path resource [applicationContext.xml]

Exception in thread "main" org.springframework.beans.factory.BeanDefinitionStoreException: IOException parsing XML document from class path resource [applicationContext.xml]; nested exception is java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist

at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:343)

at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:303)

at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:180)

at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:216)

at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:187)

at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:251)

at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:127)

at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:93)

at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:129)

at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:540)

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:454)

at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)

at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)

at com.tt.spring.beans.Main.main(Main.java:18)

Caused by: java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist

at org.springframework.core.io.ClassPathResource.getInputStream(ClassPathResource.java:158)

at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:329)

... 13 more

 

 

问题分析:


个人的文件目录树大概这样:


 


SpringDemo根目录


   --src java源文件


   --WEB-INF


        --web.xml


        --applicationContext.xml


        --classes文件夹


           --com包


              --java编译后的class文件


   --index.jsp


 


根据网上查找的解决办法,我把applicationContext.xml从bin的com层的最里面复制出来放到classess文件夹即bin文件夹中(不能放到com中,应为xml中class路径),该问题解决了。


Spring报错:java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist_spring_10


现在目录树如下:


 


   --src java源文件


   --WEB-INF


         --web.xml


         --classes文件夹


             --applicationContext.xml


             --com包


                  --java编译后的class文件


   --index.jsp


 


但是,当新建另一个Bean:Car类时,问题马上来了!!!!!!!




Spring报错:java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist_xml_04

1  1 package com.tt.spring.beans;
2 2
3 3 public class Car {
4 4
5 5 private String brand;
6 6 private String corp;
7 7 private int price;
8 8 private int maxSpeed;
9 9
10 10
11 11 public Car() {
12 12 System.out.println("Car's Constructor");
13 13 }
14 14
15 15 public Car(String brand, String corp, int price) {
16 16 super();
17 17 this.brand = brand;
18 18 this.corp = corp;
19 19 this.price = price;
20 20 }
21 21
22 22 @Override
23 23 public String toString() {
24 24 return "Car [brand=" + brand + ", corp=" + corp + ", price=" + price + ", maxSpeed=" + maxSpeed + "]";
25 25 }
26 26
27 27 }


Spring报错:java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist_xml_04


applicationContext.xml



Spring报错:java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist_xml_04

1 <?xml version="1.0" encoding="UTF-8"?>
2 <beans xmlns="http://www.springframework.org/schema/beans"
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4 xsi:schemaLocation="http://www.springframework.org/schema/beans
5 http://www.springframework.org/schema/beans/spring-beans.xsd">
6
7 <context:component-scan base-package="com.tt.spring.beans"></context:component-scan>
8 <!--
9 配置bean
10 class:bean的全类名,通过反射的方式在IOC容器中创建Bean实例,所以要求Bean中必须有无参的构造器
11 id:标识容器中的bean,id唯一
12 -->
13 <bean id="helloWorld" class="com.tt.spring.beans.HelloWorld">
14 <property name="name" value="Spring"></property>
15 </bean>
16
17 <!-- 通过构造方法来配置bean的属性 -->
18 <bean id="car" class="com.tt.spring.beans.Car">
19 <constructor-arg value="Audi"></constructor-arg>
20 <constructor-arg value="chengdu"></constructor-arg>
21 <constructor-arg value="30000"></constructor-arg>
22 </bean>
23
24 </beans>


Spring报错:java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist_xml_04


Main.java

Spring报错:java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist_xml_15

 

控制台打印信息如下:

 

Spring报错:java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist_xml文件_16

 

看到没?只能获取一个bean实例,不能获取两个。

原因分析:

在项目里,applicationContext.xml是在src最里面一层的,不在src的那一层,所以一旦运行Main.java文件,相应的就会在bin的目录下生成对应的applicationContext.xml文件。

Spring报错:java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist_spring_17

但是我们又在bin文件夹里做过粘贴applicationContext.xml。

 Spring报错:java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist_spring_10

所以说applicationContext.xml的目录压根就是混乱的!!!既是处于根目录,又处于com最里面的目录。

要么在项目上将xml移到src那一层,那么bin底下的xml也对应着-------xml就处于根目录。

要么在项目上仍然位于com的最里面,那么bin那里就不要将xml移出来----xml就处于最里面的目录

至于xml文件究竟在哪个目录,就该用相应的读取方式。

 

ClassPathXmlApplicationContext和FileSystemXmlApplicationContext读取xml


 

 ApplicationContext applicationContext = new FileSystemXmlApplicationContext("WEB-INF/classes/applicationContext.xml"); 


 ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml") 


 


 现在这个项目是使用ClassPathXmlApplicationContext读取xml文件的,就把配置文件appicationContext.xml放到src的那一层。


Spring报错:java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist_根目录_19

 


如果使用FileSystemXmlApplicationContext读取,则需把配置文件放到整个项目的根目录