SpringMvc的xml配置与annotation配置的例子的区别

1.导入jar包时,要在xml配置基础上加 spring-aop-4.2.2.RELEASE.jar （注解的时候需要）

2.编写controller的时候要annotation需要做相关配置即红色部分，而xml就是要实现controller的接口

（a）annotation配置时

package com.spring.hello;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.stereotype.Controller;
@Controller
public class HelloController {
  @RequestMapping("/hello")
  public ModelAndView hello(HttpServletRequest req,HttpServletResponse resp)
  {
        ModelAndView mv=new ModelAndView();
        mv.addObject("msg", "第一个annotation");
        mv.setViewName("Hello");
        return mv;
  }
}

　　

（b）xml配置时

package com.spring.hello;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
 
public class HelloController implements Controller{
 
@Override
public ModelAndView handleRequest(HttpServletRequest arg0,
HttpServletResponse arg1) throws Exception {
// TODO Auto-generated method stub
ModelAndView mv=new ModelAndView();
mv.addObject("msg", "第一个SpringMvc");
mv.setViewName("Hello");
return mv;
}
 
}

3.在SpringMvc文件annotation不需要

<!--  配置hanlderMapping  -->
	<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean>
	<!--  配置 handlerAdapter-->
	<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>

但是要把

<!--  配置请求和处理器	-->
	<bean  name="/hello.do" class="com.spring.hello.HelloController"></bean>

　　修改成

	<!--  配置请求和处理器	-->
	<context:component-scan base-package="com.spring.hello"></context:component-scan>