SpringMVC传值、转发、重定向例子

1. 练习接收页面参数值
   1. 使用request
   2. 使用@RequestParam注解
   3. 使用实体对象
2. 练习向页面传出数据
   1. 使用ModelAndView对象
   2. 使用ModelMap对象
   3. 使用@ModelAttribute注解
3. 练习使用session
   1. 在Controller方法参数上直接声明HttpSession即可使用
4. 练习重定向
   1. 使用RedirectView
   2. 使用redirect:

package web;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.view.RedirectView;

import entity.User;

//非注解方式
//public class HelloController implements Controller {
//
//
//    public ModelAndView handleRequest(HttpServletRequest request,
//            HttpServletResponse response) throws Exception {
//        System.out.println("Hello, Controller.");
//        return new ModelAndView("jsp/hello");
//    }
//
//}

@Controller
@RequestMapping("/demo")
public class HelloController{
    private Integer age=22;

    @RequestMapping("hello.do")
    public ModelAndView hello(HttpServletRequest request,
            HttpServletResponse response) throws Exception{
        return new ModelAndView("jsp/hello");
    }

    /**
     * 测试request接收参数*/
    @RequestMapping("test1.do")
    public ModelAndView test1(HttpServletRequest req){
        String userName = req.getParameter("userName");
        String password = req.getParameter("password");
        System.out.println(userName);
        System.out.println(password);
        return new ModelAndView("jsp/hello");
    }

    /**
     * 测试sping会自动将表单参数注入到方法参数
     */
    @RequestMapping("test2.do")
    public ModelAndView test2(String userName,
            @RequestParam("password") String pwd){
        System.out.println(userName+","+pwd);
        return new ModelAndView("jsp/hello");
    }

    /**
     * 测试对象接收参数
     */
    @RequestMapping("test3.do")
    public ModelAndView test3(User user){
        System.out.println(user);
        return new ModelAndView("jsp/hello");
    }

    /**
     * 使用ModelAndView传出参数 内部 HttpServletRequest的Attribute传递到jsp页面
     */
    @RequestMapping("test4.do")
    public ModelAndView test4(User user){
        Map<String, Object> data = new HashMap<String, Object>();
        data.put("user", user);
        return new ModelAndView("jsp/hello",data);
    }

    /**
     * 使用ModelMap传出参数   内部HttpServletRequest的Attribute传递到jsp页面
     */
    @RequestMapping("test5.do")
    public ModelAndView test5(User user,ModelMap modelMap){
        modelMap.put("user", user);
        return new ModelAndView("jsp/hello");
    }

    /**
     * 使用ModelAttribute 内部HttpServletRequest的Attribute传递到jsp页面
     * 在Contoller的参数部分或者bean属性方法上使用
     */
    @RequestMapping("test6.do")
    public ModelAndView test6(@ModelAttribute("user")User user){
        return new ModelAndView("jsp/hello");
    }

    @ModelAttribute("age")
    public Integer getAge(){
        return age;
    }

    /**
     * session存储   可以使用HttpServletRequest的getSession方法访问
     */
    @RequestMapping("test7.do")
    public ModelAndView test7(HttpServletRequest req){
        HttpSession session = req.getSession();
        session.setAttribute("salary", 6000.0);
        return new ModelAndView("jsp/hello");
    }

    //返回String 转发
    @RequestMapping("/test8.do")
    public String test8(User user, ModelMap model) {
        model.addAttribute("user", user);
        return "jsp/hello";
    }

    /**
     * 错误页面
     */
    @RequestMapping("test9.do")
    public String test9(){
        return "error/error";
    }

    /**
     *使用RedirectView重定向
     */
    @RequestMapping("test10")
    public ModelAndView test10(User user){
        if(user.getUserName().equals("123")){
            return new ModelAndView("jsp/hello");//test10.do 转发
        }else{
            return new ModelAndView(new RedirectView("test9.do"));//test9.do?age=22 重定向
        }
    }

    /**
     * 使用redirect重定向
     */
    @RequestMapping("test11")
    public String test11(User user){
        if(user.getUserName().equals("123")){
            return "jsp/hello";
        }else{
            return "redirect:test9.do";
        }
    }
}

user实体

package com.tarena.entity;
import java.io.Serializable;
public class User implements Serializable {
    private Integer id;
    private String userName;
    private String password;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
}