SpringMVC获取页面表单参数的几种方式

最新推荐文章于 2022-11-27 14:17:00 发布

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最新推荐文章于 2022-11-27 14:17:00 发布

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本文详细介绍了在SpringMVC环境下，如何通过四种不同方式从页面表单中获取参数，包括直接使用方法参数、通过HttpServletRequest、利用Bean对象以及接收JSON数据。

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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

复制代码

<%@ 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>

复制代码

package com.yyx.model;

public class User {
private String userName;
private String userPwd;

public String getUserName() {
return userName;

    }

public void setUserName(String userName) {
this.userName = userName;

    }

public String getUserPwd() {
return userPwd;

    }

public void setUserPwd(String userPwd) {
this.userPwd = userPwd;

    }


}

复制代码

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

复制代码

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";

    }

}

复制代码

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

复制代码

<%@ 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>

复制代码

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