Controller加载控制与业务bean加载控制

SpringMVC相关bean(表现层bean)

Spring控制的bean

业务bean(Service)

功能bean(DateSource等)

SpringMVC相关bean加载控制

SpringMVC加载的bean对应的包均在com.itheima.controller包内

Spring相关bean加载控制

方式一:Spring加载的bean设定扫描范围为com.itheima,排除controller包内的bean

方式二:Spring加载的bean设定扫描范围为精准扫描,例如service包、dao包等

方式三:不区分Spring与SpringMVC的环境,加载到同一个环境中

方式一:

名称:@ComponentScan

类型:类注解

范例:

​​import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.stereotype.Controller;

@Configuration
//设置spring配置类加载bean时的过滤规则,当前要求排除掉表现层对应的bean
//excludeFilters属性:设置扫描加载bean时,排除的过滤规则
//type属性:设置排除规则,当前使用按照bean定义时的注解类型进行排除
//classes属性:设置排除的具体注解类,当前设置排除@Controller定义的bean
@ComponentScan(value="com.itheima",
excludeFilters = @ComponentScan.Filter(
type = FilterType.ANNOTATION,
classes = Controller.class
)
)
public class SpringConfig {
}​​

属性:

excludeFilters:排除扫描路径中加载的bean,需要指定类别(type)与具体项(classes)

includeFilters:加载指定的bean,需要指定类别(type)与具体项(classes)

方式三:

bean的加载格式:

public class ServletContainersInitConfig extends AbstractDispatcherServletInitializer {
protected WebApplicationContext createServletApplicationContext() {
AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
ctx.register(SpringMvcConfig.class);
return ctx;
}
protected WebApplicationContext createRootApplicationContext() {
AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
ctx.register(SpringConfig.class);
return ctx;
}
protected String[] getServletMappings() {
return new String[]{"/"};
}
}

简化开发:

//web配置类简化开发,仅设置配置类类名即可
public class ServletContainersInitConfig extends AbstractAnnotationConfigDispatcherServletInitializer {

protected Class<?>[] getRootConfigClasses() {
return new Class[]{SpringConfig.class};
}

protected Class<?>[] getServletConfigClasses() {
return new Class[]{SpringMvcConfig.class};
}

protected String[] getServletMappings() {
return new String[]{"/"};
}
}