springMVC 传递参数和回传数据

本文主要是介绍springMVC 传递参数和回传数据，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1、基本数据类型+String上传：

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><html>
<body>
<h2>Hello World!</h2>
<%
String path = request.getContextPath();
%>
<a href="<%=request.getContextPath()%>/user/delete.do?id=10015"> delete </a><form action="<%=path %>/user/login.do" method="post">账号：<input type="text" name="account"><br>密码：<input type="password" name="pwd"><br>账号：<input type="submit" value="提交"><br></form>
</body>
</html>

Controller写法：

package com.xingxue.controller;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;import com.xingxue.service.UserService;@Controller
@RequestMapping("/user")
public class UserContrller {@Autowiredpublic UserService service;public ModelAndView userLogin1(String account, String pwd) {System.out.println("canshu : " + account);System.out.println("canshu : " + pwd);ModelAndView mv = new ModelAndView();mv.setViewName("user/ok");mv.addObject("msg", "ok!!!!!!");return mv;}}

测试通过
复杂数据类型，实体对象作为参数传递：

@RequestMapping("/login2.do")public ModelAndView userLogin2(User user) {System.out.println("canshu : " + user.getAccount());System.out.println("canshu : " + user.getPwd());ModelAndView mv = new ModelAndView();mv.setViewName("user/ok");mv.addObject("msg", "ok!!!!!!");return mv;}
页面代码
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><html>
<body>
<h2>Hello World!</h2>
<%
String path = request.getContextPath();
%>
<a href="<%=request.getContextPath()%>/user/delete.do?id=10015"> delete </a><form action="<%=path %>/user/login2.do" method="post">账号：<input type="text" name="account"><br>密码：<input type="password" name="pwd"><br>账号：<input type="submit" value="提交"><br></form>
</body>
</html>

此处注意：区别与struts2， struts2 提交参数是对象名.属性名，springMVC是直接属性名，springMVC会自动到该对象获取该属性并且注入数据。

HashMap接收参数

此处需要注意：@RequestParam注解，表示吧参数全部注入到map对象里面

@RequestMapping("/login3.do")public ModelAndView userLogin3(@RequestParam HashMap<String, Object> param) {System.out.println(param.get("account"));System.out.println(param.get("pwd"));ModelAndView mv = new ModelAndView();mv.setViewName("user/ok");mv.addObject("msg", "ok!!!!!!");return mv;}
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><html>
<body>
<h2>Hello World!</h2>
<%
String path = request.getContextPath();
%>
<a href="<%=request.getContextPath()%>/user/delete.do?id=10015"> delete </a><form action="<%=path %>/user/login3.do" method="post">账号：<input type="text" name="account"><br>密码：<input type="password" name="pwd"><br>账号：<input type="submit" value="提交"><br></form>
</body>
</html>

springMVC 获取servletAPI对象

@RequestMapping("/login3.do")public ModelAndView userLogin3(@RequestParam HashMap<String, Object> param,HttpSession session,HttpServletRequest request,HttpServletResponse response) {ModelAndView mv = new ModelAndView();HashMap<String, Object> loginUser = this.service.userLogin(param);if(loginUser == null) {mv.addObject("msg", "NO!!!!!!");mv.setViewName("index");} else {session.setAttribute("loginUser", loginUser);mv.addObject("msg", "OK!!!!!!");mv.setViewName("user/ok");}return mv;}

springMVC如果需要获取servletAPI ，只需要在方法的参数里面定义该类型的参数，springMVC就会自动注入一个该类型对象给我们。

参数回传：

ModelAndView mv = new ModelAndView();HashMap<String, Object> loginUser = this.service.userLogin(param);if(loginUser == null) {mv.addObject("msg", "NO!!!!!!");mv.setViewName("../index");} else {session.setAttribute("loginUser", loginUser);mv.addObject("msg", "OK!!!!!!");mv.setViewName("user/ok");}