JSONObject与JSONArray

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一、引入maven包

<dependency>   <groupId>net.sf.json-lib</groupId>   <artifactId>json-lib</artifactId>   <version>2.3</version>   <classifier>jdk15</classifier></dependency>

此处用的2.3版本,一般用net.sf的json包比较多，org.json的包也可以用，只不过创建对象时的方式有点不同，这里net.sf的json包为例，下面的例子有引用原文博主的例子：

二、JSONObject

 //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));输出结果：

jsonObject1：{"UserName":"ZHULI","age":"30","workIn":"ALI"}jsonObject2：{"workIn":"ALI","age":"30","UserName":"ZHULI"}

三、JSONArray

 //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));                //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);输出结果：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"]}

四、解析字符串

 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) + " ");            }        }输出结果：UserName:ZHULIArray:ZHULI Array:30 Array:ALI

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