SpringMVC参数接收

Spring MVC框架中请求参数处理与作用域提升技术

最新推荐文章于 2025-09-12 18:08:49 发布

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最新推荐文章于 2025-09-12 18:08:49 发布

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文章标签： java

原文链接：http://www.cnblogs.com/c2603/p/4945071.html

本文详细介绍了Spring MVC框架下通过HttpServletRequest、Model、URL路径变量、ModelMap、ModelAttribute以及作用域提升至session级别的多种请求参数处理方式，并通过实例展示了如何接收并操作这些参数。

1、通过HttpRequest

    @RequestMapping("/save.do")
   public String Save(HttpServletRequest request){
       String userName=request.getParameter("userName");
       String gender = request.getParameter("gender");
       System.out.println("UserName:"+userName);
       System.out.println("Gender:"+gender);
       return "index";
   }

2、通过Model

public class User {
   private String userName;
   private String gender;
   private Integer age;

get set方法省略
}

提交表单的数据只要包含userName，gender，age，Spring会自动注入

@RequestMapping("/save1.do")
   public String Save(User user){
       System.out.println("(Model)UserName:"+user.getUserName());
       System.out.println("(Model)Gender:"+user.getGender());
       return "index";
   }

3、通过URL

    @RequestMapping("/save2/{userName}/{gender}.do")
   public String Save(@PathVariable("userName")String userName,@PathVariable("gender")String gender ){
       System.out.println("(url)UserName:"+userName);
       System.out.println("(url)Gender:"+gender);
       return "index";
   }

请求的URL/save2/cym/m.do, 接收到的参数值userName=cym,gender=m

    @RequestMapping("/save3.do")
   public String Save3(String userName){
       try {
           String strTemp = new String(userName.getBytes("ISO-8859-1"),"utf-8");
           System.out.println("(url)UserName:"+strTemp);
       } catch (UnsupportedEncodingException e) {

           e.printStackTrace();
       }

       return "index";
   }

请求的URL/save3.do?userName=cym

5 ModelMap

@RequestMapping("/modelmap.do")
   public String par1(ModelMap map){
       map.put("msg", "2015-01-13");
       return "modelmap";
   }

jsp页面通过${msg}可以取到值

6 ModelAttribute

    @RequestMapping("/modelattribute.do")
   public String par2(@ModelAttribute("user")User user){
       user.setAge(30);
       user.setGender("F");
       user.setUserName("cwg");
       return "modelmap";
   }

jsp页面取值 ${user.age } ${user.gender } ${user.userName }

将user变成session级别

@Controller
@RequestMapping("/session")
@SessionAttributes("user")
public class SessionController {

   @ModelAttribute("user")
   public User getUser(){
       return new User();
   }

}

注：通过这种方式将user作用域提升到session级别不能通过HttpSession对象iinvalidate(),removeAttribute清除

可能用如下方式清除

   @RequestMapping("/loginout.do")
   public String loginout(SessionStatus sessionStatus){
       sessionStatus.setComplete();
       return "modelmap";
   }

转载于:https://www.cnblogs.com/c2603/p/4945071.html