json的数据格式（仔细查看）

1.json对象就是jsonObject，jsonobject里可以放入很多键值对，并以逗号为分隔符。

jsonObject里还可以嵌套JsonObject对象，或者数组信息作为value，数组作为key的velue时，要以中括号包起来。即：“array”：【“1”，“2”，“3”】，

3.怎样将key value放入jsonObject里？：用jsonObject的put方法，和element方法。element方法用于放入数组或者jsonObject。

4.json字符串，比如

String jsonString = "{"UserName":"ZHULI","age":"30","workIn":"ALI","Array":["ZHULI","30","ALI"]}";
        /* 将Json字符串转为java对象 */
 JSONObject obj = JSONObject.fromObject(jsonString);

5.5.理解Json的关键在于，在于区别json字符串和json对象，json对象可以转换为json字符串，json字符串可以转换为json对象。

6.5.理解Json的关键在于，在于区别json字符串和json对象，json对象可以转换为json字符串，json字符串可以转换为json对象。

5.理解Json的关键在于，在于区别json字符串和json对象，json对象可以转换为json字符串，json字符串可以转换为json对象。Jsonobject就是json的java对象。

6.Jsonobject就是json的java对象。

4.解析jsonObject，

  /* 组装一个复杂的JSONArray */
        JSONObject jsonObject2 = new JSONObject();
        jsonObject2.put("UserName", "ZHULI");
        jsonObject2.put("age", "30");
        jsonObject2.put("workIn", "ALI");
        jsonObject2.element("Array", arrayList);
        jsonObject2.element("Object", jsonObject);
        System.out.println("jsonObject2：" + jsonObject2);

    }
}

结果：

jsonObject1：{"workIn":"ALI","age":"30","UserName":"ZHULI"}
jsonObject2 FROM HASHMAP：{"workIn":"ALI","age":"30","UserName":"ZHULI"}
jsonArray1：["ZHULI","30","ALI"]
jsonArray2 FROM ArrayList：["ZHULI","30","ALI"]
jsonArray FROM HASHMAP：[{"workIn":"ALI","age":"30","UserName":"ZHULI"}]
jsonObject2：{"workIn":"ALI","age":"30","Array":["ZHULI","30","ALI"],"UserName":"ZHULI","Object":{"workIn":"ALI","age":"30","UserName":"ZHULI"}  
解析json

public class Test {  
  
    public static void main(String[] args) {  
  
        String jsonString = "{"UserName":"ZHULI","age":"30","workIn":"ALI","Array":["ZHULI","30","ALI"]}";  
        /* 将Json字符串转为java对象 */  
        JSONObject obj = JSONObject.fromObject(jsonString);  
  
        /* 获取Object中的UserName */  
        if (obj.has("UserName")) {  
            System.out.println("UserName:" + obj.getString("UserName"));  
        }  
  
        /* 获取ArrayObject */  
        if (obj.has("Array")) {  
            JSONArray transitListArray = obj.getJSONArray("Array");  
            for (int i = 0; i < transitListArray.size(); i++) {  
                System.out.print("Array:" + transitListArray.getString(i) + " ");  
            }  
        }  
    }  
}
解析json
public class Test {  
  
    public static void main(String[] args) {  
  
        String jsonString = "{"UserName":"ZHULI","age":"30","workIn":"ALI","Array":["ZHULI","30","ALI"]}";  
        /* 将Json字符串转为java对象 */  
        JSONObject obj = JSONObject.fromObject(jsonString);  
  
        /* 获取Object中的UserName */  
        if (obj.has("UserName")) {  
            System.out.println("UserName:" + obj.getString("UserName"));  
        }  
  
        /* 获取ArrayObject */  
        if (obj.has("Array")) {  
            JSONArray transitListArray = obj.getJSONArray("Array");  
            for (int i = 0; i < transitListArray.size(); i++) {  
                System.out.print("Array:" + transitListArray.getString(i) + " ");  
            }  
        }  
    }  
}
public class Test {

    public static void main(String[] args) {

        String jsonString = "{"UserName":"ZHULI","age":"30","workIn":"ALI","Array":["ZHULI","30","ALI"]}";
        /* 将Json字符串转为java对象 */
        JSONObject obj = JSONObject.fromObject(jsonString);

        /* 获取Object中的UserName */
        if (obj.has("UserName")) {
            System.out.println("UserName:" + obj.getString("UserName"));
        }

        /* 获取ArrayObject */
        if (obj.has("Array")) {
            JSONArray transitListArray = obj.getJSONArray("Array");
            for (int i = 0; i < transitListArray.size(); i++) {
                System.out.print("Array:" + transitListArray.getString(i) + " ");
            }
        }
    }
}