SpringMvc 封装传递参数的方式 和限制访问的方式Post?Get?..

 <form method="post" action="${pageContext.request.contextPath}/user/hello1.action">
      <input type="text"  name="username">
      <br/>
      <input type="submit" value="提交"/>
    </form>

@Controller
@RequestMapping(value = "/user", method = RequestMethod.POST) //可以限制访问的方式 只有post的请求才能进入
public class HelloAction {



    @RequestMapping("/hello1.action")
    //springmvc是通过方法的参数方式传递参数的，所以它可以实现单例的
    public String hello(Model model, HttpServletRequest request, HttpServletResponse response,String username) throws  Exception{
        System.out.println("传递过来的username:"+username);
        model.addAttribute("messsage","注解实现springmvc");
        return "hello";
    }
}

 <form method="post" action="${pageContext.request.contextPath}/user/hello1.action">
      <input type="text"  name="username">
      <br/>
      <input type="submit" value="提交"/>
    </form>

package com.cn.controllers;

public class User {
    private String username;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    @Override
    public String toString() {
        return "User{" +
                "username=‘" + username + ‘\‘‘ +
                ‘}‘;
    }
}

@Controller
@RequestMapping(value = "/user", method = RequestMethod.POST) //可以限制访问的方式 只有post的请求才能进入
public class HelloAction {

　　

 //时期类型转换器
　　
　　@InitBinder
    protected void initBinder(HttpServletRequest request, ServletRequestDataBinder binder) throws Exception {
        //参数类型：将String转成什么类型的字节;
        binder.registerCustomEditor(
                Date.class,
                new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"),true));


    }

    @RequestMapping("/hello1.action")
    //springmvc是通过方法的参数方式传递参数的，所以它可以实现单例的
    public String hello(Model model, User user) throws  Exception{

        System.out.println(user.getUsername());

        return "hello";
    }
}