最近公司開發的幾個項目中,后臺Action向前端傳遞數據都是Json格式,于是對JSONObject、JSONArray簡單的研究了一下,廢話不多說,想使用JSONObject、JSONArray,策則在項目中必須要有commons-lang.jar commons-beanutils.jar commons-collections.jar commons-logging.jar ezmorph.jar json-lib-2.2.2-jdk15.jar 這些Jar包。
1.JSONObject與JSONArray使用的場景區別;
- 想通過鍵值對的形式獲取數據,使用JSONObject。
- 如果后臺查詢的是某個bean的list集合向前端頁面傳遞,使用JSONArray。
2. JSONObject與JSONArray使用方法區別;
創建方法不同:
JSONObject創建的方法:
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//創建JsonObject第一種方法 JSONObject jsonObject = new JSONObject(); jsonObject.put( "UserName" , "kobi" ); jsonObject.put( "age" , "34" ); jsonObject.put( "workIn" , "ALI" ); System.out.println( "jsonObject1:" + jsonObject); //創建JsonObject第二種方法 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)); |
JSONArray創建的方法
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//創建一個JsonArray方法1 JSONArray jsonArray = new JSONArray(); jsonArray.add( 0 , "kobi" ); jsonArray.add( 1 , "34" ); jsonArray.add( 2 , "ALI" ); System.out.println( "jsonArray1:" + jsonArray); //創建JsonArray方法2 ArrayList<String> arrayList = new ArrayList<String>(); arrayList.add( "kobi" ); arrayList.add( "34" ); arrayList.add( "ALI" ); System.out.println( "jsonArray2:" + JSONArray.fromObject(arrayList)); |
獲取方式不同
- 獲取JSONObject中值:String userName = jsonObject.getString("UserName");
- 獲取JSONArray中的值:String userName = arrayList.getString("2");
示例
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package com.yunos.tv.video.resource.controller.web; import java.util.ArrayList; import java.util.HashMap; import net.sf.json.JSONArray; import net.sf.json.JSONObject; public class Test { public static void main(String[] args) { //JsonObject和JsonArray區別就是JsonObject是對象形式,JsonArray是數組形式 //創建JsonObject第一種方法 JSONObject jsonObject = new JSONObject(); jsonObject.put( "UserName" , "ZHULI" ); jsonObject.put( "age" , "30" ); jsonObject.put( "workIn" , "ALI" ); System.out.println( "jsonObject1:" + jsonObject); //創建JsonObject第二種方法 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)); //創建一個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); //創建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解析一個HashMap,則會將整個對象的放進一個數組的值中 System.out.println( "jsonArray FROM HASHMAP:" + JSONArray.fromObject(hashMap)); //組裝一個復雜的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); } } |
結果:
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"]}
3. 解析JSON字符串;
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package com.yunos.tv.video.resource.controller.web; import net.sf.json.JSONArray; import net.sf.json.JSONObject; public class Test { public static void main(String[] args) { String jsonString = "{\"UserName\":\"kobi\",\"age\":\"34\",\"workIn\":\"ALI\",\"Array\":[\"kobi\",\"34\",\"ALI\"]}" ; //將Json字符串轉為java對象 JSONObject obj = JSONObject.fromObject(jsonString); //獲取Object中的UserName if (obj.has( "UserName" )) { System.out.println( "UserName:" + obj.getString( "UserName" )); } //獲取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) + " " ); } } } } |
返回值:
UserName:kobi
Array:kobi Array:34 Array:ALI
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持服務器之家。
原文鏈接:http://www.cnblogs.com/snake-hand/p/3167787.html