SpringMVC传值、转发、重定向例子

1.练习接收页面参数值1.使用request2.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HttpServletRequest和session2.使用ModelAndView对象（内部为利用HttpServletRequest的Attribute传递数据到页面）3.使用ModelMap对象（内部为利用HttpServletRequest的Attribute传递数据到页面）4.使用@ModelAttribute注解（内部为利用HttpServletRequest的Attribute传递数据到页面）3.练习使用session1.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RedirectView2.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 er;//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")publicclass HelloController{private Integer age=22;@RequestMapping("hello.do")public ModelAndView hello(HttpServletRequest request,HttpServletResponse response) throws Exception{ returnnew 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);returnnew ModelAndView("jsp/hello");}/*** 测试sping会自动将表单参数注入到方法参数* 最好每个形参前都添加@requestparameter* 通过反射只能得到方法参数类型不能等到方法参数名称没有加注解能成功获得为编译器自动添加*/@RequestMapping("test2.do")public ModelAndView test2(String userName,@RequestParam("password") String pwd){System.out.println(userName+","+pwd);returnnew ModelAndView("jsp/hello");}/*** 测试对象接收参数*/@RequestMapping("test3.do")public ModelAndView test3(User user){System.out.println(user);returnnew ModelAndView("jsp/hello");}/*** 使用ModelAndView传出参数内部 HttpServletRequest的Attribute 传递到jsp页面* ModelAndView(String viewName,Map data)data是处理结果*/@RequestMapping("test4.do")public ModelAndView test4(User user){Map<String, Object> data = new HashMap<String, Object>();data.put("user", user);returnnew 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);returnnew 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){ returnnew 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);returnnew 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")){returnnew ModelAndView("jsp/hello");//test10.do 转发}else{returnnew 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;publicclass User implements Serializable { private Integer id;private String userName;private String password;public Integer getId() {return id;}publicvoid setId(Integer id) {this.id = id;}public String getUserName() {return userName;}publicvoid setUserName(String userName) { erName = userName;}public String getPassword() {return password;}publicvoid setPassword(String password) { this.password = password;}}。