SpringMVC获取页面表单参数的几种方式

以下几种方式只有在已搭好的SpringMVC环境中，才能执行成功！

首先，写一个登陆页面和一个Bean类

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>


<!DOCTYPE html>


<html>


<head>


<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">


<title>yyx博客后台登录</title>

</head>


<body>


<form action="${pageContext.request.contextPath}/user/login.do"

method="post">


<table>


<tr>


<td>用户名:</td>


<td><input type="text"
  name="userName"></td>


</tr>


<tr>


<td>密码:</td>


<td><input type="password"  name="userPwd"></td>


</tr>


<tr>


<td colspan="2"><input 
type="submit" value="登陆"></td>


</tr>


</table>


</form>


</body>


</html>

package com.yyx.model;
public class User {


private String userName;


private String userPwd;


</span><span style="color: #0000ff">public</span><span style="color: #000000"> String getUserName() {</br>
    </span><span style="color: #0000ff">return</span><span style="color: #000000"> userName;</br>
}</br></br>

</span><span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> setUserName(String userName) {</br>
    </span><span style="color: #0000ff">this</span>.userName =<span style="color: #000000"> userName;</br>
}</br></br>

</span><span style="color: #0000ff">public</span><span style="color: #000000"> String getUserPwd() {</br>
    </span><span style="color: #0000ff">return</span><span style="color: #000000"> userPwd;</br>
}</br></br>

</span><span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> setUserPwd(String userPwd) {</br>
    </span><span style="color: #0000ff">this</span>.userPwd =<span style="color: #000000"> userPwd;</br>
}</br>

}

1、直接把表单的参数写在Controller相应的方法的形参中

package com.yyx.controller;


import org.springframework.stereotype.Controller;


import org.springframework.web.bind.annotation.RequestMapping;


@Controller


@RequestMapping("/user")


public class UserController {


@RequestMapping("/login")


public String loginByUser(String userName, String userPwd) {


System.out.println("userName is:" + userName);


System.out.println("userPwd is:" + userPwd);


return "success";


}


}

View Code

控制器中方法的形参String userName，String userPwd名称必须和登陆页面的name="userName"，name="userPwd"相同

2.通过HttpServletRequest接收

package com.yyx.controller;


import javax.servlet.http.HttpServletRequest;


import org.springframework.stereotype.Controller;


import org.springframework.web.bind.annotation.RequestMapping;


@Controller


@RequestMapping("/user")


public class UserController {


@RequestMapping("/login")


public String loginByUser(HttpServletRequest request) {


String userName=request.getParameter("userName");


String userPwd=request.getParameter("userPwd");


System.out.println("userName is:" + userName);


System.out.println("userPwd is:" + userPwd);


return "success";


}


}

View Code

控制器中String userName=request.getParameter("userName");String userPwd=request.getParameter("userPwd");的参数名称必须和登陆页面的name="userName"，name="userPwd"相同

3.通过一个bean来接收

package com.yyx.controller;


import org.springframework.stereotype.Controller;


import org.springframework.web.bind.annotation.RequestMapping;


import com.yyx.model.User;


@Controller


@RequestMapping("/user")


public class UserController {


@RequestMapping("/login")


public String loginByUser(User user) {


System.out.println("userName is:" + user.getUserName());


System.out.println("userPwd is:" + user.getUserPwd());


return "success";


}


}

登陆页面的name="userName"，name="userPwd"必须和Bean类的属性名称相同

4.通过json数据接收

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPE html>


<html>


<head>


<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">


<script type="text/javascript"


src="${pageContext.request.contextPath}/static/jquery-3.1.1.min.js"></script>


<title>yyx博客后台登录</title>

<script type="text/javascript">


$(document).ready(function() {


$("#button_submit").click(function() {


var name = $("#userName").val();


var pwd = $("#userPwd").val();


var user = {


userName : name,


userPwd : pwd


};//拼装成json格式


            $.ajax({


type : "POST",


url : "${pageContext.request.contextPath}/user/login.do",

data : user,


success : function(data) {

alert("成功");


},


error : function(e) {


alert("出错：" + e);


}


});


});


});


</script>


</head>


<body>


<form>


<table>


<tr>


<td>用户名:</td>


<td><input type="text"
 id="userName"></td>


</tr>


<tr>


<td>密码:</td>


<td><input type="password" id="userPwd"></td>


</tr>


<tr>


<td colspan="2"><input type="button" id="button_submit"


value="提交"></td>


</tr>


</table>


</form>


</body>


</html>

package com.yyx.controller;


import org.springframework.stereotype.Controller;


import org.springframework.web.bind.annotation.RequestMapping;


import com.yyx.model.User;


@Controller


@RequestMapping("/user")


public class UserController {


@RequestMapping("/login")


public String loginByUser(User user) {


System.out.println("userName is:" + user.getUserName());


System.out.println("userPwd is:" + user.getUserPwd());


return "success";


}


}

View Code

var user={userName:name,userPwd:pwd};//拼装成json格式语句中userName,userPwd必须和Bean类中属性名称相同