JSONObject转换为JSONArray

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一.JSONObject转JSONArray

//json串内容如下
{ 
   
    "request_id":"1111111111112",
    "audience":["aaa","bbb"],
    "settings":{ 
   
        "ttl":36000000,
        "strategy":{ 
   
            "default":3,
            "ios":4
        }
    }
}

以com.alibaba.fastjson中的JSONArray与JSONObject为例：

public static void main(String[] args) throws UnsupportedEncodingException { 
   
        String str = "{ 
   \n" +
                " \"request_id\":\"1111111111112\",\n" +
                " \"audience\":[\"aaa\",\"bbb\"],\n" +
                " \"settings\":{ 
   \n" +
                " \"ttl\":36000000,\n" +
                " \"strategy\":{ 
   \n" +
                " \"default\":3,\n" +
                " \"ios\":4\n" +
                " }\n" +
                " }\n" +
                "}";
        //一：JSONObject转JSONArray
        //json字符串转JSONObject
        JSONObject json = JSONObject.parseObject(str); //json = { 
   "settings":{ 
   "strategy":{ 
   "default":3,"ios":4},"ttl":36000000},"audience":["aaa","bbb"],"request_id":"1111111111112"}
        //方法一： 调用JSONArray的add方法，将JSONObject对象添加到JSONArray中
        JSONArray jsonArray = new JSONArray();
        jsonArray.add(json);
        System.out.println("方法一："+jsonArray); //jsonArray = [{ 
   "settings":{ 
   "strategy":{ 
   "default":3,"ios":4},"ttl":36000000},"audience":["aaa","bbb"],"request_id":"1111111111112"}]
        //方法二：直接在json前后加上 [] 符号
        String jsonArr = "["+json+"]";
        System.out.println("方法二："+jsonArr); // jsonArr = [{ 
   "settings":{ 
   "strategy":{ 
   "default":3,"ios":4},"ttl":36000000},"audience":["aaa","bbb"],"request_id":"1111111111112"}]

    }