maven依赖包：
com.alibaba
fastjson
1.2.47
测试所需的实体类
package com.xxx.controller;
import java.io.Serializable;
public class Data implements Serializable {
private static final long serialVersionUID = -6957361951748382519L;
private String id;
private String suborderNo;
private String organUnitType;
private String action;
private String parent;
private String organUnitFullName;
private Long ordinal;
get、set方法省略。。。
}
package com.xxx.controller;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
public class Error implements Serializable {
private static final long serialVersionUID = -432908543160176349L;
private String code;
private String message;
private String success;
private List data = new ArrayList<>();
get、set方法省略。。。
}
四、JSON格式字符串、JSON对象及JavaBean之间的相互转换
4.1) JAVA对象转JSON字符串
//java对象转json字符串
public static void beanTojson() {
Data data = new Data();
data.setAction("add");
data.setId("1");
data.setOrdinal(8L);
data.setOrganUnitFullName("testJSON");
data.setParent("0");
data.setSuborderNo("58961");
String s = JSON.toJSONString(data);
System.out.println("toJsonString()方法：s=" + s);
//输出结果{"action":"add","id":"1","ordinal":8,"organUnitFullName":"testJSON","parent":"0","suborderNo":"58961"}
}
4.2) A. JSON字符串转JSON对象
//json字符串转json对象
public static void jsonToJsonBean() {
String s ="{\"action\":\"add\",\"id\":\"1\",\"ordinal\":8,\"organUnitFullName\":\"testJSON\",\"parent\":\"0\",\"suborderNo\":\"58961\"}";
JSONObject jsonObject = JSON.parseObject(s);
String action = jsonObject.getString("action");
String id = jsonObject.getString("id");
System.out.println("action ="+action);//add
System.out.println("id ="+id);//1
System.out.println("jsonObject ="+jsonObject);
//action =add
//id =1
//jsonObject ={"parent":"0","organUnitFullName":"testJSON","action":"add","id":"1","suborderNo":"58961","ordinal":8}
}
B. 复杂JSON格式字符串与JSONObject之间的转换
public static void jsonToBean() {
String str ="{\"meta\":{\"code\":\"0\",\"message\":\"同步成功!\"},\"data\":{\"orderno\":\"U_2018062790915774\",\"suborderno\":\"SUB_2018062797348039\",\"type\":\"organunit\",\"result\":{\"organunit\":{\"totalCount\":2,\"successCount\":0,\"failCount\":2,\"errors\":[{\"code\":\"UUM70004\",\"message\":\"组织单元名称不能为空\",\"data\":{\"id\":\"254\",\"suborderNo\":\"SUB_2018062797348039\",\"organUnitType\":\"部门\",\"action\":\"add\",\"parent\":\"10000\",\"ordinal\":0,\"organUnitFullName\":\"组织单元全称\"},\"success\":false},{\"code\":\"UUM70004\",\"message\":\"组织单元名称不能为空\",\"data\":{\"id\":\"255\",\"suborderNo\":\"SUB_2018062797348039\",\"organUnitType\":\"部门\",\"action\":\"add\",\"parent\":\"10000\",\"ordinal\":0,\"organUnitFullName\":\"组织单元全称\"},\"success\":false}]},\"role\":{\"totalCount\":0,\"successCount\":0,\"failCount\":0,\"errors\":[]},\"user\":{\"totalCount\":0,\"successCount\":0,\"failCount\":0,\"errors\":[]}}}}";
JSONObject jsonObject = JSON.parseObject(str);
JSONObject data = jsonObject.getJSONObject("data");
JSONObject result = data.getJSONObject("result");
String organunit1 = result.getString("organunit");
System.out.println(organunit1);
JSONObject organunit = result.getJSONObject("organunit");
JSONArray errors2 = organunit.getJSONArray("errors");
List error = JSON.parseObject(errors2.toJSONString(), new TypeReference>() {
});
}
4.3) A. JSON字符串转JAVA简单对象
//json字符串转java简单对象
public static void jsonStrToJavaBean() {
String s ="{\"action\":\"add\",\"id\":\"1\",\"ordinal\":8,\"organUnitFullName\":\"testJSON\",\"parent\":\"0\",\"suborderNo\":\"58961\"}";
Data data = JSON.parseObject(s, Data.class);
System.out.println("data对象"+data.toString());
System.out.println("action="+data.getAction()+"---id="+data.getId());
//data对象Data{id='1', suborderNo='58961', organUnitType='null', action='add', parent='0', organUnitFullName='testJSON', ordinal=8}
//action=add---id=1
/**
* 另一种方式转对象
*/
Data dd = JSON.parseObject(s, new TypeReference() {});
System.out.println("另一种方式获取data对象"+dd.toString());
System.out.println("另一种方式获取="+dd.getAction()+"---id="+dd.getId());
//另一种方式获取data对象Data{id='1', suborderNo='58961', organUnitType='null', action='add', parent='0', organUnitFullName='testJSON', ordinal=8}
//另一种方式获取=add---id=1
}
B. JSON字符串 数组类型与JAVA对象的转换
测试json字符串
{"errors":[{"code":"UUM70004","message":"组织单元名称不能为空","data":{"id":"254","suborderNo":"SUB_2018062797348039","organUnitType":"部门","action":"add","parent":"10000","ordinal":0,"organUnitFullName":"组织单元全称"},"success":false},{"code":"UUM70004","message":"组织单元名称不能为空","data":{"id":"255","suborderNo":"SUB_2018062797348039","organUnitType":"部门","action":"add","parent":"10000","ordinal":0,"organUnitFullName":"组织单元全称"},"success":false}]}
//json字符串--数组型与JSONArray对象之间的转换
public static void jsonStrToJSONArray() {
String str = "{\"errors\":[{\"code\":\"UUM70004\",\"message\":\"组织单元名称不能为空\",\"data\":{\"id\":\"254\",\"suborderNo\":\"SUB_2018062797348039\",\"organUnitType\":\"部门\",\"action\":\"add\",\"parent\":\"10000\",\"ordinal\":0,\"organUnitFullName\":\"组织单元全称\"},\"success\":false},{\"code\":\"UUM70004\",\"message\":\"组织单元名称不能为空\",\"data\":{\"id\":\"255\",\"suborderNo\":\"SUB_2018062797348039\",\"organUnitType\":\"部门\",\"action\":\"add\",\"parent\":\"10000\",\"ordinal\":0,\"organUnitFullName\":\"组织单元全称\"},\"success\":false}]}";
JSONObject jsonObject = JSON.parseObject(str);
JSONArray error = jsonObject.getJSONArray("errors");
List errors = JSON.parseObject(error.toJSONString(), new TypeReference>() {
});
for (Error e: errors) {
//Error的属性
System.out.println("Error属性="+e.getSuccess());
System.out.println("Error属性="+e.getCode());
System.out.println("Error属性="+e.getMessage());
//Error集合属性
List datas = e.getData();
for (Data d: datas) {
System.out.println("data对象属性="+d.getId());
System.out.println("data对象属性="+d.getAction());
System.out.println("data对象属性="+d.getSuborderNo());
}
}
//Error属性=false
//Error属性=UUM70004
//Error属性=组织单元名称不能为空
//data对象属性=254
//data对象属性=add
//data对象属性=SUB_2018062797348039
//Error属性=false
//Error属性=UUM70004
//Error属性=组织单元名称不能为空
//data对象属性=255
//data对象属性=add
//data对象属性=SUB_2018062797348039
}
C. JSON字符串 第二种方法-->数组类型与JAVA对象的转换
//第二种方法：json字符串--数组型与JSONArray对象之间的转换
@Test
public void jsonStrToJSONArray2() {
String str = "{\"errors\":[{\"code\":\"UUM70004\",\"message\":\"组织单元名称不能为空\",\"data\":{\"id\":\"254\",\"suborderNo\":\"SUB_2018062797348039\",\"organUnitType\":\"部门\",\"action\":\"add\",\"parent\":\"10000\",\"ordinal\":0,\"organUnitFullName\":\"组织单元全称\"},\"success\":false},{\"code\":\"UUM70004\",\"message\":\"组织单元名称不能为空\",\"data\":{\"id\":\"255\",\"suborderNo\":\"SUB_2018062797348039\",\"organUnitType\":\"部门\",\"action\":\"add\",\"parent\":\"10000\",\"ordinal\":0,\"organUnitFullName\":\"组织单元全称\"},\"success\":false}]}";
//获取jsonobject对象
JSONObject jsonObject = JSON.parseObject(str);
//把对象转换成jsonArray数组
JSONArray error = jsonObject.getJSONArray("errors");
//error==>[{"code":"UUM70004","message":"组织单元名称不能为空","data":{"id":"254","suborderNo":"SUB_2018062797348039","organUnitType":"部门","action":"add","parent":"10000","ordinal":0,"organUnitFullName":"组织单元全称"},"success":false},{"code":"UUM70004","message":"组织单元名称不能为空","data":{"id":"255","suborderNo":"SUB_2018062797348039","organUnitType":"部门","action":"add","parent":"10000","ordinal":0,"organUnitFullName":"组织单元全称"},"success":false}]
//将数组转换成字符串
String jsonString = JSONObject.toJSONString(error);//将array数组转换成字符串
//将字符串转成list集合
List errors = JSONObject.parseArray(jsonString, Error.class);//把字符串转换成集合
for (Error e: errors) {
//Error的属性
System.out.println("另一种数组转换Error属性="+e.getSuccess());
System.out.println("另一种数组转换Error属性="+e.getCode());
System.out.println("另一种数组转换Error属性="+e.getMessage());
//Error集合属性
List datas = e.getData();
for (Data d: datas) {
System.out.println("另一种数组转换data对象属性="+d.getId());
System.out.println("另一种数组转换data对象属性="+d.getAction());
System.out.println("另一种数组转换data对象属性="+d.getSuborderNo());
}
}
//另一种数组转换Error属性=false
//另一种数组转换Error属性=UUM70004
//另一种数组转换Error属性=组织单元名称不能为空
//另一种数组转换data对象属性=254
//另一种数组转换data对象属性=add
//另一种数组转换data对象属性=SUB_2018062797348039
//另一种数组转换Error属性=false
//另一种数组转换Error属性=UUM70004
//另一种数组转换Error属性=组织单元名称不能为空
//另一种数组转换data对象属性=255
//另一种数组转换data对象属性=add
//另一种数组转换data对象属性=SUB_2018062797348039
}
4.4) JAVA对象转JSON对象
//javabean转json对象
public static void jsonBenToJsonObject() {
Data data = new Data();
data.setAction("add");
data.setId("1");
data.setOrdinal(8L);
data.setOrganUnitFullName("testJSON");
data.setParent("0");
data.setSuborderNo("58961");
JSONObject jsonObj = (JSONObject) JSON.toJSON(data);
JSON json = (JSON) JSON.toJSON(data);
System.out.println("jsonObj"+jsonObj);
System.out.println("json对象"+json);
//jsonObj{"parent":"0","organUnitFullName":"testJSON","action":"add","id":"1","suborderNo":"58961","ordinal":8}
//json对象{"parent":"0","organUnitFullName":"testJSON","action":"add","id":"1","suborderNo":"58961","ordinal":8}
}
/**
* 通过fastjson把字符串转换成泛型数组
* TypeReference
*/
public static void string2List(){
StringBuffer buffer=new StringBuffer();
buffer.append("[{");
buffer.append("\"age\":").append("27").append(",");
buffer.append("\"userName\":").append("\"龙叔\"").append(",");
buffer.append("\"address\":").append("\"广东省云浮市\"");
buffer.append("}]");
String jsonText=buffer.toString();
//转成成数组
Student[] stu2 = JSON.parseObject(jsonText,new TypeReference(){});
List list = Arrays.asList(stu2);
for(Student st:list){
System.out.println(st.getAddress());
}
// 转换成ArrayList
ArrayList list2 = JSON.parseObject(jsonText, new TypeReference>(){});
for (int i = 0; i < list2.size(); i++) {
Student obj =(Student) list2.get(i);
System.out.println(obj.getAddress());
}
}
/**
* 通过fastjson把Map换成字符串转
*/
public static void map2json(){
//创建一个Map对象
Map map = new HashMap();
map.put("username", "周伯通");
map.put("address", "广东省仙游谷");
map.put("age", "198");
String json = JSON.toJSONString(map,true); //转成JSON数据
Map map1 = (Map)JSON.parse(json);
//遍历数组数据
for (String key : map1.keySet()) {
System.out.println(key+":"+map1.get(key));
}
}
/**
* 通过fastjson把Map换成字符串转
*/
public static void map2JSON() {
Map map = new HashMap();
map.put("username", "周伯通");
map.put("address", "广东省仙游谷");
map.put("age", "198");
String json = JSON.toJSONString(map);
Map map1 = JSON.parseObject(json);
for (Object obj : map.entrySet()) {
Map.Entry entry = (Map.Entry) obj;
System.out.println(entry.getKey() + "--->" + entry.getValue());
}
}
}
package ivyy.taobao.com.entity;
import java.io.Serializable;
/**
*@Author:liangjl
*@Date:2014-12-19
*@Version:1.0
*@Description:
*/
public class Student implements Serializable{
private Integer age;
private String sex;
private String userName;
private String birthday;
private String address;
private String email;
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getBirthday() {
return birthday;
}
public void setBirthday(String birthday) {
this.birthday = birthday;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
}