1.JAR包簡介
要使程序可以運行必須引入JSON-lib包,JSON-lib包同時依賴于以下的JAR包:
1.commons-lang.jar
2.commons-beanutils.jar
3.commons-collections.jar
4.commons-logging.jar
5.ezmorph.jar
6.json-lib-2.2.2-jdk15.jar
2.JSONObject對象使用
JSON-lib包是一個beans,collections,maps,java arrays 和XML和JSON互相轉換的包。在本例中,我們將使用JSONObject類創建JSONObject對象,然后我們打印這些對象的值。為了使用JSONObject對象,我們要引入"net.sf.json"包。為了給對象添加元素,我們要使用put()方法。
2.1.實例1
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package jsontest; import net.sf.json.JSONArray; import net.sf.json.JSONObject; public class JSONObjectSample { // 創建JSONObject對象 private static JSONObject createJSONObject() { JSONObject jsonObject = new JSONObject(); jsonObject.put( "username" , "huangwuyi" ); jsonObject.put( "sex" , "男" ); jsonObject.put( "Min.score" , new Integer( 99 )); jsonObject.put( "nickname" , "夢中心境" ); return jsonObject; } public static void main(String[] args) { JSONObject jsonObject = JSONObjectSample.createJSONObject(); //靜待方法,直接通過類名+方法調用 // 輸出jsonobject對象 System.out.println( "jsonObject:" + jsonObject); // 判讀輸出對象的類型 boolean isArray = jsonObject.isArray(); boolean isEmpty = jsonObject.isEmpty(); boolean isNullObject = jsonObject.isNullObject(); System.out.println( "是否為數組:" + isArray + ", 是否為空:" + isEmpty + ", isNullObject:" + isNullObject); // 添加屬性,在jsonObject后面追加元素。 jsonObject.element( "address" , "福建省廈門市" ); System.out.println( "添加屬性后的對象:" + jsonObject); // 返回一個JSONArray對象 JSONArray jsonArray = new JSONArray(); jsonArray.add( 0 , "this is a jsonArray value" ); jsonArray.add( 1 , "another jsonArray value" ); jsonObject.element( "jsonArray" , jsonArray); //在jsonObject后面住家一個jsonArray JSONArray array = jsonObject.getJSONArray( "jsonArray" ); System.out.println(jsonObject); System.out.println( "返回一個JSONArray對象:" + array); // 添加JSONArray后的值 // {"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"夢中心境","address":"福建省廈門市","jsonArray":["this is a jsonArray value","another jsonArray value"]} System.out.println( "結果=" + jsonObject); // 根據key返回一個字符串 String username = jsonObject.getString( "username" ); System.out.println( "username==>" + username); // 把字符轉換為 JSONObject String temp = jsonObject.toString(); JSONObject object = JSONObject.fromObject(temp); // 轉換后根據Key返回值 System.out.println( "qq=" + object.get( "QQ" )); }} |
輸出結果
jsonObject:{"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"夢中心境"}
是否為數組:false,
是否為空:false,
isNullObject:false添加屬性后的對象:
{"username":"huangwuyi",
"sex":"男",
"QQ":"413425430",
"Min.score":99,"nickname":"夢中心境",
"address":"福建省廈門市"}
{"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"夢中心境",
"address":"福建省廈門市","jsonArray":["this is a jsonArray value","another jsonArray value"]}
返回一個JSONArray對象:["this is a jsonArray value","another jsonArray value"]
結果={"username":"huangwuyi","sex":"男",
"QQ":"413425430","Min.score":99,"nickname":"夢中心境","address":"福建省廈門市",
"jsonArray":["this is a jsonArray value",
"another jsonArray value"]}username==>huangwuyiqq=413425430
2.2.實例2.
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package jsontest; import net.sf.json.JSONArray; import net.sf.json.JSONObject; public class JSONTest { public static void main(String args[]) { JSONObject jsonObj0 = new JSONObject(); JSONObject jsonObj = new JSONObject(); JSONObject jsonObj2 = new JSONObject(); JSONObject jsonObj3 = new JSONObject(); JSONArray jsonArray = new JSONArray(); //創建jsonObj0 jsonObj0.put( "name0" , "zhangsan" ); jsonObj0.put( "sex1" , "female" ); System.out.println( "jsonObj0:" +jsonObj0); //創建jsonObj1 jsonObj.put("name", "xuwei"); jsonObj.put( "sex" , "male" ); System.out.println( "jsonObj:" +jsonObj); //創建jsonObj2,包含兩個條目,條目內容分別為jsonObj0,jsonObj1 jsonObj2.put( "item0" , jsonObj0); jsonObj2.put( "item1" , jsonObj); System.out.println( "jsonObj2:" +jsonObj2); //創建jsonObj3,只有一個條目,內容為jsonObj2 jsonObj3.element( "j3" , jsonObj2); System.out.println( "jsonObj3:" +jsonObj3); //往JSONArray中添加JSONObject對象。發現JSONArray跟JSONObject的區別就是JSONArray比JSONObject多中括號[] jsonArray.add(jsonObj); System.out.println( "jsonArray:" +jsonArray); JSONObject jsonObj4 = new JSONObject(); jsonObj4.element( "weather" , jsonArray); System.out.println( "jsonObj4:" +jsonObj4); }} |
輸出結果:
jsonObj0:{"name0":"zhangsan","sex1":"female"
}jsonObj:{"name":"xuwei","sex":"male"}jsonObj2:
{"item0":{"name0":"zhangsan","sex1":"female"},
"item1":
{"name":"xuwei","sex":"male"}}jsonObj3:{"j3":
{"item0":{"name0":"zhangsan","sex1":"female"}
,"item1":{"name":"xuwei","sex":"male"}}}
jsonArray:[{"name":"xuwei","sex":"male"}]
jsonObj4:{"weather":
[{"name":"xuwei","sex":"male"}]}
以上所述是小編給大家介紹的JSONObject與JSONArray的使用知識,希望對大家有所幫助,如果大家想了解更多內容敬請關注服務器之家網站!