Android解析Json速度最快的库:json-smart

来源：互联网发布：阿里云国际版信用卡编辑：程序博客网时间：2024/05/06 17:15

场景描述：

本文仅验证了在安卓环境下使用Json的Key作为反序列化条件的解析速度。结论是解析速度最快的不是阿里的fastjson，也不是Google的Gson，而是json-smart。

Android 4.4.2

fastjson-1.1.34.android.jar

gson-2.2.4.jar

json-smart-2.0-RC3.jar

**注意场景的限定条件**

核心代码：

package com.h3c.mytestview;import java.io.StringReader;import net.minidev.json.JSONValue;import android.app.Activity;import android.os.Bundle;import android.util.Log;import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.JSONObject;import com.google.gson.Gson;import com.google.gson.JsonElement;import com.google.gson.JsonObject;import com.google.gson.JsonParser;import com.google.gson.stream.JsonReader;public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                new Thread(new Runnable() {            @Override            public void run() {                doSth();            }        }).start();    }        private void doSth() {        Log.e("H6c","start...");        String json = "{\"name\":\"reiz\"}";        String k = "";        try {            long startTime1 = System.currentTimeMillis();            for(int n = 0;n < 100000; n++) {                org.json.JSONObject jo;                    jo = new org.json.JSONObject(json);                k = jo.getString("name");            }            long endTime1 = System.currentTimeMillis() - startTime1;            Log.e("H6c","android:"+ endTime1);                        long startTime2 = System.currentTimeMillis();            for(int n = 0;n < 100000; n++) {                JSONObject jo = JSON.parseObject(json);                k = jo.getString("name");            }            long endTime2 = System.currentTimeMillis() - startTime2;            Log.e("H6c","fastjson:"+ endTime2);                        long startTime3 = System.currentTimeMillis();            for(int n = 0;n < 100000; n++) {                net.minidev.json.JSONObject jo = (net.minidev.json.JSONObject)JSONValue.parseStrict(json);                k = (String)jo.get("name");            }            long endTime3 = System.currentTimeMillis() - startTime3;            Log.e("H6c","json-smart:"+endTime3);                        long startTime4 = System.currentTimeMillis();            for(int n = 0;n < 100000; n++) {                JsonElement je = new JsonParser().parse(json);                JsonObject jo = je.getAsJsonObject();                k = jo.get("name").getAsString();            }            long endTime4 = System.currentTimeMillis() - startTime4;            Log.e("H6c","gson:"+endTime4);        } catch (Exception e) {            e.printStackTrace();        }    }}

测试结果:

Galaxy S3

===========Galaxy S3=============105-22 11:04:17.120: E/H6c(28681): start...05-22 11:04:21.525: E/H6c(28681): android:440005-22 11:04:28.135: E/H6c(28681): fastjson:660805-22 11:04:31.600: E/H6c(28681): json-smart:346705-22 11:04:47.440: E/H6c(28681): gson:15839===========Galaxy S3=============205-22 11:05:08.230: E/H6c(28681): start...05-22 11:05:12.120: E/H6c(28681): android:388605-22 11:05:17.285: E/H6c(28681): fastjson:516705-22 11:05:21.020: E/H6c(28681): json-smart:373605-22 11:05:34.040: E/H6c(28681): gson:13018===========Galaxy S3=============305-22 11:05:45.440: E/H6c(28681): start...05-22 11:05:49.470: E/H6c(28681): android:403305-22 11:05:54.500: E/H6c(28681): fastjson:503105-22 11:05:58.240: E/H6c(28681): json-smart:373605-22 11:06:13.485: E/H6c(28681): gson:15245

Galaxy S4

===========Galaxy S4=============105-22 10:58:03.541: E/H6c(26600): start...05-22 10:58:06.934: E/H6c(26600): android:339305-22 10:58:12.680: E/H6c(26600): fastjson:575205-22 10:58:15.232: E/H6c(26600): json-smart:254905-22 10:58:24.841: E/H6c(26600): gson:9610===========Galaxy S4=============205-22 11:00:51.675: E/H6c(26600): start...05-22 11:00:54.878: E/H6c(26600): android:320905-22 11:01:00.413: E/H6c(26600): fastjson:552605-22 11:01:02.986: E/H6c(26600): json-smart:256905-22 11:01:11.084: E/H6c(26600): gson:8099===========Galaxy S4=============305-22 11:01:31.213: E/H6c(26600): start...05-22 11:01:34.717: E/H6c(26600): android:350805-22 11:01:40.172: E/H6c(26600): fastjson:544305-22 11:01:42.734: E/H6c(26600): json-smart:256605-22 11:01:52.554: E/H6c(26600): gson:9823

Xiaomi3

===========Xiaomi 3=============105-22 11:02:05.461: E/H6c(30473): start...05-22 11:02:08.021: E/H6c(30473): android:256105-22 11:02:11.781: E/H6c(30473): fastjson:376605-22 11:02:13.411: E/H6c(30473): json-smart:162905-22 11:02:16.811: E/H6c(30473): gson:3402===========Xiaomi 3=============205-22 11:02:30.291: E/H6c(30473): start...05-22 11:02:32.481: E/H6c(30473): android:218405-22 11:02:36.341: E/H6c(30473): fastjson:385605-22 11:02:37.781: E/H6c(30473): json-smart:143905-22 11:02:40.991: E/H6c(30473): gson:3210===========Xiaomi 3=============305-22 11:02:47.731: E/H6c(30473): start...05-22 11:02:50.271: E/H6c(30473): android:254805-22 11:02:53.831: E/H6c(30473): fastjson:355305-22 11:02:55.261: E/H6c(30473): json-smart:143105-22 11:02:58.571: E/H6c(30473): gson:3310

从测试结果来看：

在使用key解析json的场景下，速度最快的是json-smart，其解析速度有所提升。

本文研究的结论是Android原生Java解析已经具备基础json解析能力，并且在速度上有一定的优势，在简单的场景下无需引用噱头比较大的fastjson和gson。而且在对速度没有极端追求的场景下也无需引入json-smart, 因为其可能仅仅只帮你节省了后台1s的时间，感官上其实察觉不明显。

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