JSONObject与JSONArray的使用-解析Json

来源：互联网发布：计算一组数据的标准差编辑：程序博客网时间：2024/06/12 01:05

需要依赖的包：commons-lang.jar commons-beanutils.jar commons-collections.jar commons-logging.jar ezmorph.jar json-lib-2.2.2-jdk15.jar

import net.sf.json.JSONArray;import net.sf.json.JSONObject;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.utils.URIUtils;public class Test {      public static void main(String[] args) {          //JsonObject和JsonArray区别就是JsonObject是对象形式，JsonArray是数组形式          //创建JsonObject第一种方法          JSONObject jsonObject = new JSONObject();          jsonObject.put("UserName", "ZHULI");          jsonObject.put("age", "30");          jsonObject.put("workIn", "ALI");          System.out.println("jsonObject1：" + jsonObject);          //创建JsonObject第二种方法          HashMap<String, String> hashMap = new HashMap<String, String>();          hashMap.put("UserName", "ZHULI");          hashMap.put("age", "30");          hashMap.put("workIn", "ALI");          System.out.println("jsonObject2：" + JSONObject.fromObject(hashMap));          //创建一个JsonArray方法1          JSONArray jsonArray = new JSONArray();          jsonArray.add(0, "ZHULI");          jsonArray.add(1, "30");          jsonArray.add(2, "ALI");          System.out.println("jsonArray1：" + jsonArray);          //创建JsonArray方法2          ArrayList<String> arrayList = new ArrayList<String>();          arrayList.add("ZHULI");          arrayList.add("30");          arrayList.add("ALI");          System.out.println("jsonArray2：" + JSONArray.fromObject(arrayList));          //如果JSONArray解析一个HashMap，则会将整个对象的放进一个数组的值中          System.out.println("jsonArray FROM HASHMAP：" + JSONArray.fromObject(hashMap));            //输出为jsonArray FROM HASHMAP：[{"workIn":"ALI","age":"30","UserName":"ZHULI"}]         //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);          System.out.println("jsonObject2：" + jsonObject2);                    //输出为jsonObject2：{"UserName":"ZHULI","age":"30","workIn":"ALI","Array":["ZHULI","30","ALI"]}      }  }

结果为：

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

解析Json字符串

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) + " ");              }          }      }

输出：

UserName:ZHULI  Array:ZHULI Array:30 Array:ALI

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