JSON数据处理

1.添加json依赖

springmvc 默认使用jackson作为json类库,不需要修改applicationContext-servlet.xml任何配置，只需引入以下类库springmvc就可以处理json数据：

<!--spring-json依赖-->
<dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.9.0</version>
</dependency>

2.注解

@RequestBody：作用是接收前端ajax传递给后端的json字符串，并将json格式的数据转为java对象
@ResponseBody：作用是将java对象转为json格式的数据传递给前台ajax

3.JSON、集合、对象三种数据处理

3.1.JSON数据处理

1)pojo

package com.by.pojo;import java.io.Serializable;
import java.util.Date;public class Account implements Serializable {private Integer id;private String name;private Float money;private Address address;private Date date;@Overridepublic String toString() {return "Account{" +"id=" + id +", name='" + name + '\'' +", money=" + money +", address=" + address +", date=" + date +'}';}public Date getDate() {return date;}public void setDate(Date date) {this.date = date;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Float getMoney() {return money;}public void setMoney(Float money) {this.money = money;}public Address getAddress() {return address;}public void setAddress(Address address) {this.address = address;}
}

package com.by.pojo;import java.io.Serializable;public class Address implements Serializable {private String provinceName;private String cityName;@Overridepublic String toString() {return "Address{" +"provinceName='" + provinceName + '\'' +", cityName='" + cityName + '\'' +'}';}public String getProvinceName() {return provinceName;}public void setProvinceName(String provinceName) {this.provinceName = provinceName;}public String getCityName() {return cityName;}public void setCityName(String cityName) {this.cityName = cityName;}
}

2）编写controller层

@Controller
@RequestMapping("/Account")
public class AccountController {
@RequestMapping("/controller16")@ResponseBody //pojo---》转JSONpublic Account controller16(@RequestBody Account account){//@RequestBody json--》转pojoSystem.out.println(account);return account;}
}

3）在index.jsp里面定义ajax请求

添加按钮

 <input type="button" value="测试ajax请求json和响应json" id="testJson"/>

引入js库文件

<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>

编写ajax代码

  <script type="text/javascript">$(function(){$("#testJson").click(function(){$.ajax({type:"post",url:"/Account/controller16",contentType:"application/json;charset=UTF-8",data:'{"id":1,"name":"张二狗","money":999.0}',success:function(data) {}})});})</script>

结果：

3.2集合数据处理

1）编写controller层

@RequestMapping("/controller17")@ResponseBodypublic Map controller17(@RequestBody Account account){Map<String, Object> map = new HashMap<>();try {//int a=6/0;map.put("status",200);map.put("msg",account);} catch (Exception e) {e.printStackTrace();map.put("status",500);map.put("msg","未知异常！！！！");}return map;}

2）编写ajax代码

<script type="text/javascript">$(function(){$("#testJson").click(function(){$.ajax({type:"post",url:"/Account/controller17",contentType:"application/json;charset=UTF-8",data:'{"id":1,"name":"张二狗","money":999.0}',success:function(data) {if (data.status == 200) {alert(data.msg.name);alert(data.msg.money);}else {alert(data.msg);}}})});})</script>

测试：

3.3对象数据处理

1)pojo

package com.by.pojo;public class Result {private Integer status;private Object msg;@Overridepublic String toString() {return "Result{" +"status=" + status +", msg=" + msg +'}';}public Integer getStatus() {return status;}public void setStatus(Integer status) {this.status = status;}public Object getMsg() {return msg;}public void setMsg(Object msg) {this.msg = msg;}
}

2)编写controller层

 @RequestMapping("/controller18")@ResponseBodypublic Result controller18(@RequestBody Account account){Result result = new Result();try {//int a=6/0;result.setStatus(200);result.setMsg(account);} catch (Exception e) {e.printStackTrace();result.setStatus(500);result.setMsg("未知异常！！！！！");}return result;}

3)编写ajax代码

 <script type="text/javascript">$(function(){$("#testJson").click(function(){$.ajax({type:"post",url:"/Account/controller18",contentType:"application/json;charset=UTF-8",data:'{"id":1,"name":"张二狗","money":999.0}',success:function(data) {if (data.status == 200) {alert(data.msg.name);alert(data.msg.money);}else {alert(data.msg);}}})});})</script>

结果：