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:
XML
<!--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
java
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;
@Override
public 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;
}
}
java
package com.by.pojo;
import java.io.Serializable;
public class Address implements Serializable {
private String provinceName;
private String cityName;
@Override
public 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
java
@Controller
@RequestMapping("/Account")
public class AccountController {
@RequestMapping("/controller16")
@ResponseBody //pojo---》转JSON
public Account controller16(@RequestBody Account account){//@RequestBody json--》转pojo
System.out.println(account);
return account;
}
}
3)在index.jsp里面定义ajax请求
添加按钮
html
<input type="button" value="测试ajax请求json和响应json" id="testJson"/>
引入js库文件
html
<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>
编写ajax代码
html
<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
java
@RequestMapping("/controller17")
@ResponseBody
public 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
html
<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
java
package com.by.pojo;
public class Result {
private Integer status;
private Object msg;
@Override
public 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
java
@RequestMapping("/controller18")
@ResponseBody
public 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
html
<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: