SpringMVC+AJAX+JSON

　　在做一个ajax发送json到springmvc的控制层，控制层的对象中有一个List集合，ajax调用总是报415错误。发现了一个一直没有注意到的问题，借机记录一下。

(细节部分都忽略了，在最后的demo项目地址中会有。这里只写主要的步骤)

一、添加pom.xml依赖

　　springmvc的pom.xml依赖在demo工程里都有，这里主要强调要添加以下两个依赖，否则@RequestBody和@ResponseBody这两个注解就不起作用。

<dependency>

    <groupId>com.fasterxml.jackson.core</groupId>

    <artifactId>jackson-core</artifactId>

    <version>2.5.4</version>

</dependency>

<dependency>

    <groupId>com.fasterxml.jackson.core</groupId>

    <artifactId>jackson-annotations</artifactId>

    <version>2.5.4</version>

</dependency>

<dependency>

    <groupId>com.fasterxml.jackson.core</groupId>

    <artifactId>jackson-databind</artifactId>

    <version>2.5.4</version>

</dependency>

<dependency>

    <groupId>com.fasterxml.jackson.jaxrs</groupId>

    <artifactId>jackson-jaxrs-json-provider</artifactId>

    <version>2.5.4</version>

</dependency>

二、Controller层

package org.hope.lee.controller;

import org.hope.lee.model.User;

import org.springframework.http.HttpStatus;

import org.springframework.http.ResponseEntity;

import org.springframework.stereotype.Controller;

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

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

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

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

import org.springframework.web.servlet.ModelAndView;

import com.alibaba.fastjson.JSONObject;

@Controller

@RequestMapping("/user")

public class UserController {

    @RequestMapping("index")

    public ModelAndView toAddUserPage() {

        return new ModelAndView("addUser");

    }

    @RequestMapping(value = "/add",method = RequestMethod.POST)

    @ResponseBody

    public ResponseEntity<String> addUser(@RequestBody User user) {

        JSONObject object = new JSONObject();

        object.put("success", "成功");

        return new ResponseEntity<>(object.toString(), HttpStatus.OK);

    }

}

三、JSP页面

　　注意"②"处的代码，这种方式传递list参数给controller层种的@RequestBody对象是会报415错误的。我发现是因为"②"处addresses的value会多一个双引号

　　{"name":"李四","age":"59","gender":"男","addresses":"[{\"addressName\":\"A区\"},{\"addressName\":\"B区\"}]"}。

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

    pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

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

<title>Insert title here</title>

<script type="text/javascript" src="../static/js/jquery-1.11.0.js"></script>

<script type="text/javascript">

    $(document).ready(function() {

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

            var vname = $('#name').val();

            var vage = $('#age').val();

            var vgender = $("input[name='gender']:checked").val();

            var checkedParams = $("input:checkbox:checked");

            checked_val = [];

            for(k in checkedParams){

                if(checkedParams[k].checked)

                    checked_val.push(checkedParams[k].value);

            };

            var arr = new Array();

            for(var i = 0; i < checked_val.length; i++) {

                arr.push({'addressName':checked_val[i]});

            }

            var arrs = JSON.stringify(arr);

            var params = {

                name : vname,

                age : vage,

                gender : vgender,

                addresses:arrs

            }

            var params2 = '{"name":\"'+vname+'\","age":'+vage+',"gender":\"'+vgender+'\","addresses":'+arrs+'}' //如果有更好的办法，希望给我留言。

            console.log("params=" + JSON.stringify(params));

            console.log("params2=" + params2);

            $.ajax({

                url : "add",

                type : 'POST',

                data : params2, //①

                //data:JSON.stringify(params), //②

                dataType : 'json',

                contentType : "application/json;charset=utf-8",

                beforeSend: function() {

                },

                success : function(data) {

                    alert("保存成功");

                },

                error : function(XMLHttpRequest, textStatus, errorThrown) {

                    console.log(textStatus + "服务器异常，请稍后尝试！");

                }

            });

        });

    });

</script>

</head>

<body>

    姓名：<input type="text" id="name" /><br/>

    年龄：<input type="text" id="age" /><br/>

    性别:

    男:<input type="radio" checked="checked" name="gender" value="男"/>

    女：<input type="radio" name="gender" value="女"/><br/>

    地址:

    A区<input type="checkbox" id="checkbox" value="A区" />

    B区<input type="checkbox" id="checkbox" value="B区" />

    C区<input type="checkbox" id="checkbox" value="B区" /><br/>

    <button id="btn" >保存</button>

</body>

</html>

https://gitee.com/huayicompany/spring-learn/tree/master/springmvc-json

巴特西

SpringMVC+AJAX+JSON

一、添加pom.xml依赖

二、Controller层

三、JSP页面

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