(Spring4 json入门)Spring4+SpringMVC+页面数据发送与接收(json格式)

jar包(Maven仓库):

Spring4 jar包(Maven仓库):

在测试过程中我查看了网上的一些教程,但是那些教程都是在Spring3环境下的,Spring3和Spring4解析json需要的jar文件不同.

在这里贴出Sring3解析json需要的jar

Sring3解析json需要的jar

1,页面获取后端数据

 jQuery.ajax( {  
        type : "GET",  
        contentType : "application/json",  
        url : "<%=request.getContextPath()%>/easyui/list.do",  
        dataType : "json",  
        success : function(data) {  
          if (data && data.success == "true") {  
            $("#info").html("共" + data.total + "条数据。<br/>");  
            $.each(data.data, function(i, item) {  
              $("#info").append(  
                  "编号：" + item.id + "，姓名：" + item.username  
                      + "，年龄：" + item.age);  
            });  
          }  
        },  
        error : function() {  
          alert("error")  
        }  
      });

jqunery ajax get 向controller请求数据contentType : "application/json",  json格式,url为请求的地址,请求成功之后json数据添加到页面

@RequestMapping(value = "/list", method = RequestMethod.GET,consumes="application/json")  
      @ResponseBody    
      public Map<String, Object> getUserList() {  
        List<UserModel> list = new ArrayList<UserModel>();  
        UserModel um = new UserModel();  
        um.setId("1");  
        um.setUsername("sss");  
        um.setAge(222);  
        list.add(um);  
        Map<String, Object> modelMap = new HashMap<String, Object>(3);  
        modelMap.put("total", "1");  
        modelMap.put("data", list);  
        modelMap.put("success", "true");  
        
        return modelMap;  
      }  
@ResponseBody   表示自动将页面json数据封装进对象只在contentType : "application/json",情况下允许.

2.向后端发送页面数据

//将一个表单的数据返回成JSON字符串  
$.fn.serializeObject = function() {  
  var o = {};  
  var a = this.serializeArray();  
  $.each(a, function() {  
    if (o[this.name]) {  
      if (!o[this.name].push) {  
        o[this.name] = [ o[this.name] ];  
      }  
      o[this.name].push(this.value || '');  
    } else {  
      o[this.name] = this.value || '';  
    }  
  });  
  return o;  
};  
  
  
$("#submit").click(function() {  
        var jsonuserinfo = $.toJSON($("#form").serializeObject());  //$.toJSON($("#form")是 jqunery.json.js中的方法
alert(jsonuserinfo); jQuery.ajax( { type : "POST", //contentType: "application/json; charset=utf-8",  contentType : 'application/json', url : "<%=request.getContextPath()%>/easyui/add.do", data : jsonuserinfo, dataType : "json", success : function(data) { alert("新增成功！"); }, error : function(data) { alert("error") } }); });
serializeObject()方法将表单内容转换成json字符串,jqunery的json对象和json字符串之间的转换也许需要jqunery插件包

jquery.json-2.2.min.js   jquery提供的json包
json2.js      json官网提供的json包 

var obj = JSON.parse(jsonuserinfo); //字符串转json对象,json2.js中的方法

var c = JSON.stringify(obj); //json对象转字json符串,json2.js中的方法

json对象和字符串的转换有很多种方式,具体的可以看其他的教程.

@RequestMapping(value = "/add", method = RequestMethod.POST,consumes="application/json")  
      @ResponseBody  
      public Map<String, String> addUser(@RequestBody UserModel model) {  
          //System.out.println(123);
         int s =  model.getAge();
          String ss = model.getId();
        String sss =   model.getUsername();
        TestUtil.test(s+ss+sss); 
          
        Map<String, String> map = new HashMap<String, String>(1);  
        map.put("success", "true");  
        return map;  
      }  
 @ResponseBody会自动将页面发送的json字符串解析成java对象,其实json对象底层就是map集合对象,java提供了工具可以将map集合转换成json对象,当然json对象和json数组的概念还是需要大家花费一些时间理解的

以下是全部代码:
<%@ page contentType="text/html; charset=utf-8" language="java" import="java.util.*,java.sql.*" errorPage="" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!doctype html>
<html>
  <head>
     <meta charset="utf-8">
     <base href="<%=basePath%>">
    
     <title>Spring MVC</title>  
<script src="${pageContext.request.contextPath}/static/editormd/examples/js/jquery.min.js"></script>
        <script type="text/javascript" src="${pageContext.request.contextPath}/static/js/jquery.json-2.2.min.js"></script>
<script type="text/javascript">
//将一个表单的数据返回成JSON对象  
$.fn.serializeObject = function() {  
  var o = {};  
  var a = this.serializeArray();  
  $.each(a, function() {  
    if (o[this.name]) {  
      if (!o[this.name].push) {  
        o[this.name] = [ o[this.name] ];  
      }  
      o[this.name].push(this.value || '');  
    } else {  
      o[this.name] = this.value || '';  
    }  
  });  
  return o;  
};  
  
  
$(document).ready(function() {  
      jQuery.ajax( {  
        type : "GET",  
        contentType : "application/json",  
        url : "<%=request.getContextPath()%>/easyui/list.do",  
        dataType : "json",  
        success : function(data) {  
          if (data && data.success == "true") {  
            $("#info").html("共" + data.total + "条数据。<br/>");  
            $.each(data.data, function(i, item) {  
              $("#info").append(  
                  "编号：" + item.id + "，姓名：" + item.username  
                      + "，年龄：" + item.age);  
            });  
          }  
        },  
        error : function() {  
          alert("error")  
        }  
      });  
      $("#submit").click(function() {  
        var jsonuserinfo = $.toJSON($("#form").serializeObject());  
        alert(typeof jsonuserinfo);  
        jQuery.ajax( {  
          type : "POST",  
            //contentType: "application/json; charset=utf-8",       
              contentType : 'application/json', 
              
          url : "<%=request.getContextPath()%>/easyui/add.do",  
          data : jsonuserinfo,  
          dataType : "json",  
          success : function(data) {  
            alert("新增成功！");  
          },  
          error : function(data) {  
            alert("error")  
          }  
        });  
      });  
    });  
    </script>
</head>  
<body>  
<div id="info"></div>  
<form action="<%=request.getContextPath()%>/easyui/add.do" method="post" id="form">  
编号：<input type="text" name="id" value="12"/>  
姓名：<input type="text" name="username" value="走走走"/>  
年龄：<input type="text" name="age" value="44"/>  
  
<input type="button" value="提交" id="submit"/>  
</form>  
</body>  
</html>
HTML代码
/**
     * 
     * Spring4 json test   start -------------------------------
     * @return
     */
    @RequestMapping(value = "/list", method = RequestMethod.GET,consumes="application/json")  
      @ResponseBody    
      public Map<String, Object> getUserList() {  
        TestUtil.test("123");
         
        List<UserModel> list = new ArrayList<UserModel>();  
        UserModel um = new UserModel();  
        um.setId("1");  
        um.setUsername("sss");  
        um.setAge(222);  
        list.add(um);  
        Map<String, Object> modelMap = new HashMap<String, Object>(3);  
        modelMap.put("total", "1");  
        modelMap.put("data", list);  
        modelMap.put("success", "true");  
        
        return modelMap;  
      }  
    
    /**
     * Spring4 json test
     * @return
     */
      @RequestMapping(value = "/add", method = RequestMethod.POST,consumes="application/json")  
      @ResponseBody  
      public Map<String, String> addUser(@RequestBody UserModel model) {  
          //System.out.println(123);
         int s =  model.getAge();
          String ss = model.getId();
        String sss =   model.getUsername();
        TestUtil.test(s+ss+sss); 
          
        Map<String, String> map = new HashMap<String, String>(1);  
        map.put("success", "true");  
        return map;  
      }
Java代码
package com.zlay.pojo;


public class UserModel{
    /**
     * 
     * Spring4 json test   class
     * @return
     */
    private String id;
    private String username;
    private int age ;
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    

}
UserModel类
 
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原文地址：https://www.cnblogs.com/zlay0701/p/5919841.html