FastJson、Jackson、Gson、Json的效率简单对比

最新推荐文章于 2025-06-28 08:07:08 发布

玉de王小狗

最新推荐文章于 2025-06-28 08:07:08 发布

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分类专栏： java基础文章标签： java json gson fastjson jackson

本文链接：https://blog.youkuaiyun.com/qq_22650745/article/details/75579403

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本文介绍了在优化代码过程中遇到的JSON解析效率问题，对比了FastJson、Jackson、Gson和org.Json四个Java JSON库在处理大量数据时的性能。测试结果显示，对于str—>list转换，FastJson速度最快，Gson次之但不稳定，org.Json最慢；而对于list—>str转换，Jackson表现最佳，其他三者差距较小。

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今天上班优化代码的时候，发现从Redis中取出List<Map<String,String>>格式的json字符串，通过net.sf.json将其转成List的时候，如果List.size()在1000左右时，消耗处理时间为1000ms，效率非常低；然后搜了下java解析json常用api，发现alibaba的fastJson处理效率还是不错的，当size在1000左右时，也就不足100ms。
然后。。。。回家就简单对比了下几个json处理方式：FastJson、Jackson、Gson、org.Json;
首先maven引入依赖：

    <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>20170516</version>
        </dependency>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.1</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.35</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.0.pr4</version>
        </dependency>

编写相应的类，测试jsonStr–list，list–jsonStr的处理时间

org.json

package com.love.yu.maven.learn.json;

import java.util.List;
import org.json.JSONArray;

public class TestJson {
    public void testJsonStr2List(String str) {
        long a = System.currentTimeMillis();
        JSONArray jsonArray = new JSONArray(str);
        List<Object> list = jsonArray.toList();
        long b = System.currentTimeMillis();
        System.out.println("JsonStr2List:size=" + list.size() + ",time=" + (b - a));
    }

    public String testJsonList2Str(List<String> list) {
        long a = System.currentTimeMillis();
        JSONArray array = new JSONArray(list);
        String str = array.toString();
        long b = System.currentTimeMillis();
        System.out.println("JsonList2Str:length=" + str.length() + ",time=" + (b - a));
        return str;
    }
}

fastJson

package com.love.yu.maven.learn.json;

import java.util.List;
import com.alibaba.fastjson.JSONArray;

public class TestFastJson {
    public void testFastJsonStr2List(String str) {
        long a = System.currentTimeMillis();
        JSONArray jsonArray = JSONArray.parseArray(str);
        List<String> list = jsonArray.toJavaList(String.class);
        long b = System.currentTimeMillis();
        System.out.println("FastJsonStr2List:size=" + list.size() + ",time=" + (b - a));
    }

    public String testFastJsonList2Str(List<String> list) {
        long a = System.currentTimeMillis();
        String str = JSONArray.toJSONString(list);
        long b = System.currentTimeMillis();
        System.out.println("FastJsonList2Str:length=" + str.length() + ",time=" + (b - a));
        return str;
    }
}

jackson

package com.love.yu.maven.learn.json;

import java.io.IOException;
import java.util.List;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class TestJackson {
    public void testJacksonStr2List(String str) throws JsonParseException, JsonMappingException, IOException {
        long a = System.currentTimeMillis();
        ObjectMapper objectMapper = new ObjectMapper();
        List<String> list = objectMapper.readValue(str, List.class);
        long b = System.currentTimeMillis();
        System.out.println("JacksonStr2List:size=" + list.size() + ",time=" + (b - a));
    }

    public String testJacksonList2Str(List<String> list) throws JsonProcessingException {
        long a = System.currentTimeMillis();
        ObjectMapper objectMapper = new ObjectMapper();
        String str = objectMapper.writeValueAsString(list);
        long b = System.currentTimeMillis();
        System.out.println("JacksonList2Str:length=" + str.length() + ",time=" + (b - a));
        return str;
    }
}

gson

package com.love.yu.maven.learn.json;

import java.util.List;

import com.google.gson.Gson;

public class TestGson {
    public void testGsonStr2List(String str) {
        long a = System.currentTimeMillis();
        Gson gson = new Gson();
        List<String> list = gson.fromJson(str, List.class);
        long b = System.currentTimeMillis();
        System.out.println("GsonStr2List:size=" + list.size() + ",time=" + (b - a));
    }

    public String testGsonList2Str(List<String> list) {
        long a = System.currentTimeMillis();
        Gson gson = new Gson();
        String str = gson.toJson(list);
        long b = System.currentTimeMillis();
        System.out.println("GsonList2Str:length=" + str.length() + ",time=" + (b - a));
        return str;
    }
}

最后编写测试类（Main代替）

package com.love.yu.maven.learn.json;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.love.yu.maven.learn.enums.CityEnum;
import com.love.yu.maven.learn.util.Enums;

public class CompareJson {
    public static void main(String[] args) throws JsonParseException, JsonMappingException, IOException {
        List<String> list = new ArrayList<String>();
        for (int i = 0; i < 5000000; i++) {
            String name = Enums.random(CityEnum.class).name();
            list.add(name + "-" + i);
        }

        TestJson testJson = new TestJson();
        for (int i = 0; i < 10; i++) {
            String str = testJson.testJsonList2Str(list);
            testJson.testJsonStr2List(str);
        }

        System.out.println("------------");
        TestFastJson fastJson = new TestFastJson();
        for (int i = 0; i < 10; i++) {
            String str = fastJson.testFastJsonList2Str(list);
            fastJson.testFastJsonStr2List(str);
        }

        System.out.println("------------");
        TestJackson testJackson = new TestJackson();
        for (int i = 0; i < 10; i++) {
            String str = testJackson.testJacksonList2Str(list);
            testJackson.testJacksonStr2List(str);
        }
        System.out.println("------------");
        TestGson testGson = new TestGson();
        for (int i = 0; i < 10; i++) {
            String str = testGson.testGsonList2Str(list);
            testGson.testGsonStr2List(str);
        }
    }
}

以size=5000000的list测试转换效率，结果如下

JsonList2Str:length=93890636,time=2060
JsonStr2List:size=5000000,time=4272
JsonList2Str:length=93890636,time=2646
JsonStr2List:size=5000000,time=3270
JsonList2Str:length=93890636,time=2512
JsonStr2List:size=5000000,time=4024
JsonList2Str:length=93890636,time=2366
JsonStr2List:size=5000000,time=3918
JsonList2Str:length=93890636,time=2386
JsonStr2List:size=5000000,time=3977
JsonList2Str:length=93890636,time=2323
JsonStr2List:size=5000000,time=3928
JsonList2Str:length=93890636,time=2352
JsonStr2List:size=5000000,time=4019
JsonList2Str:length=93890636,time=2355
JsonStr2List:size=5000000,time=4001
JsonList2Str:length=93890636,time=2342
JsonStr2List:size=5000000,time=3913
JsonList2Str:length=93890636,time=2401
JsonStr2List:size=5000000,time=4152
------------
FastJsonList2Str:length=93890636,time=2269
FastJsonStr2List:size=5000000,time=747
FastJsonList2Str:length=93890636,time=2150
FastJsonStr2List:size=5000000,time=646
FastJsonList2Str:length=93890636,time=2032
FastJsonStr2List:size=5000000,time=673
FastJsonList2Str:length=93890636,time=2020
FastJsonStr2List:size=5000000,time=652
FastJsonList2Str:length=93890636,time=2149
FastJsonStr2List:size=5000000,time=639
FastJsonList2Str:length=93890636,time=2015
FastJsonStr2List:size=5000000,time=639
FastJsonList2Str:length=93890636,time=2050
FastJsonStr2List:size=5000000,time=632
FastJsonList2Str:length=93890636,time=1998
FastJsonStr2List:size=5000000,time=639
FastJsonList2Str:length=93890636,time=2175
FastJsonStr2List:size=5000000,time=630
FastJsonList2Str:length=93890636,time=2011
FastJsonStr2List:size=5000000,time=624
------------
JacksonList2Str:length=93890636,time=1989
JacksonStr2List:size=5000000,time=671
JacksonList2Str:length=93890636,time=666
JacksonStr2List:size=5000000,time=1763
JacksonList2Str:length=93890636,time=615
JacksonStr2List:size=5000000,time=1843
JacksonList2Str:length=93890636,time=412
JacksonStr2List:size=5000000,time=1643
JacksonList2Str:length=93890636,time=651
JacksonStr2List:size=5000000,time=1727
JacksonList2Str:length=93890636,time=625
JacksonStr2List:size=5000000,time=1755
JacksonList2Str:length=93890636,time=594
JacksonStr2List:size=5000000,time=1584
JacksonList2Str:length=93890636,time=647
JacksonStr2List:size=5000000,time=1704
JacksonList2Str:length=93890636,time=651
JacksonStr2List:size=5000000,time=1817
JacksonList2Str:length=93890636,time=606
JacksonStr2List:size=5000000,time=1626
------------
GsonList2Str:length=93890636,time=2244
GsonStr2List:size=5000000,time=708
GsonList2Str:length=93890636,time=2031
GsonStr2List:size=5000000,time=2133
GsonList2Str:length=93890636,time=2091
GsonStr2List:size=5000000,time=688
GsonList2Str:length=93890636,time=2078
GsonStr2List:size=5000000,time=1721
GsonList2Str:length=93890636,time=2150
GsonStr2List:size=5000000,time=648
GsonList2Str:length=93890636,time=2211
GsonStr2List:size=5000000,time=2679
GsonList2Str:length=93890636,time=1974
GsonStr2List:size=5000000,time=679
GsonList2Str:length=93890636,time=2079
GsonStr2List:size=5000000,time=1706
GsonList2Str:length=93890636,time=2124
GsonStr2List:size=5000000,time=647
GsonList2Str:length=93890636,time=2103
GsonStr2List:size=5000000,time=2604