使用fastjson对Map或List实现快速Json格式转换

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fastjson是一个Java语言编写的高性能功能完善的JSON库支持各种JDK类型。包括基本类型、JavaBean、Collection、Map、Enum、泛型等，fastjson采用独创的算法，将parse的速度提升到极致，超过所有json库，包括曾经号称最快的jackson。以下简单的Map、List<Map>转换json示例：

import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.JSONArray;import com.alibaba.fastjson.JSONObject;import java.util.ArrayList;import java.util.HashMap;import java.util.Map;/*** * 利用alibaba的fastjson将数据转化为Json格式 */public class Transform2Json {    /** 将Map转换为JsonObject */    public static JSONObject map2JsonObject(){        HashMap<Object, Object> hp = new HashMap<>();        hp.put("lat",32.7681);        hp.put("lon","114.1379");        hp.put("header","iron");        hp.put("request","post");        hp.put("page","1");        String s = JSON.toJSONString(hp);        JSONObject jsonObject = JSONObject.parseObject(s);        return jsonObject;    }    /** 将List<Map>格式数据转换为JsonArray */    public static JSONArray list2JsonArray(){        ArrayList<Map<Object, Object>> maps = new ArrayList<>();        HashMap<Object, Object> dataMap = new HashMap<>();        HashMap<Object, Object> dataMap1 = new HashMap<>();        dataMap.put("request","get");        dataMap.put("status",200);        dataMap.put("header","git");        dataMap1.put("block","1");        maps.add(dataMap);        maps.add(dataMap1);        String s1 = JSON.toJSONString(maps);        JSONArray jsonArray = JSONArray.parseArray(s1);        return jsonArray;    }    public static void main(String[] args) {        JSONObject jsonObject = map2JsonObject();        JSONArray jsonArray = list2JsonArray();        System.out.println("Map转换JsonObject后:"+jsonObject);        System.out.println("List转换JsonArray后:"+jsonArray);    }}运行结果如下：Map转换JsonObject后:{"request":"post","header":"iron","lon":"114.1379","page":"1","lat":32.7681}List转换JsonArray后:[{"request":"get","header":"git","status":200},{"block":"1"}]Process finished with exit code 0

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