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json转对象

2019-06-10 20:36 1431 查看

json转对象,就是把json串用对象类表示,然后调用new JSONObject().parseObject(json, User.class)方法
如:json串

{
"id": "10",
"name": "每特教育",
"items": [
{
"itemId": "20",
"itemName": "蚂蚁课堂"
},
{
"itemId": "21",
"itemName": "每特学院"
}
]
}

定义user类,将对象关系包含进去

package com.edu.emple;

import java.util.List;

/**
* @author shkstart
* @date 2019/6/10- 20:23
*/
class Item{
private String itemId;
private String itemName;

public String getItemId() {
return itemId;
}

public void setItemId(String itemId) {
this.itemId = itemId;
}

public String getItemName() {
return itemName;
}

public void setItemName(String itemName) {
this.itemName = itemName;
}

@Override
public String toString() {
return "Item{" +
"itemId='" + itemId + '\'' +
", itemName='" + itemName + '\'' +
'}';
}
}
public class User {
private String id;
private String name;
private List<Item> items;

public String getId() {
return id;
}

public void setId(String id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public List<Item> getItems() {
return items;
}

public void setItems(List<Item> items) {
this.items = items;
}

@Override
public String toString() {
return "User{" +
"id='" + id + '\'' +
", name='" + name + '\'' +
", items=" + items +
'}';
}
}

测试:

package com.edu.emple;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

/**
* @author shkstart
* @date 2019/6/10- 18:53
*/
public class test001 {
static String json ="{\"id\":\"10\",\"name\":\"每特教育\",\"items\":[{\"itemId\":\"20\",\"itemName\":\"蚂蚁课堂\"},{\"itemId\":\"21\",\"itemName\":\"每特学院\"}]}";

public static void main(String[] args) {
//1.先转换为jsonobject对象
JSONObject jsonObject = new JSONObject().parseObject(json);
String id = jsonObject.getString("id");
System.out.println(id);
String name = jsonObject.getString("name");
System.out.println("id:"+id+"name:"+name);
JSONArray jsonArray =jsonObject.getJSONArray("items");
for (int i = 0; i < jsonArray.size(); i++) {
JSONObject jsonObject1 = jsonArray.getJSONObject(i);
String itemId = jsonObject1.getString("itemId");
String itemName = jsonObject1.getString("itemName");
System.out.println("itemId:"+itemId+"----itemName"+itemName);

}

//json转对象
User user = new JSONObject().parseObject(json, User.class);
System.out.println(user.toString());
}
}

结果:

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