Jackson，Gson，Fastjson的解析时间对比

Jackson版本：2.9.1
Gson版本：2.8.2
Fastjson版本：1.2.40

pom.xml加入依赖

<dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.2</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.40</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.9.1</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.9.1</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.1</version>
        </dependency>

新建Bean类

package com;

public class Book{
    private String id;
    private String name;
    public Book() {
        super();
    }
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return "Book{" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                '}';
    }
}

---

测试类

package com;

import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.gson.Gson;
import com.alibaba.fastjson.JSON;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;

/**
 * Created by admin on 2017/11/12.
 */
public class Time {
    private final static Logger log = LoggerFactory.getLogger(Time.class);

    static void jackJson(String jsonStr, int num) throws IOException {
        long start = System.currentTimeMillis(); // 记录起始时间
        Book book = new Book();
        ObjectMapper mapper = new ObjectMapper();
        mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
        for (int j = 0; j<num; j++){
            book  = mapper.readValue(jsonStr, Book.class);
        }
        long end = System.currentTimeMillis();
        log.error("jackJson循环 {} 次花费的时间为:{}", num, end-start);
    }

    static void fastJson(String jsonStr, int num){
        long start = System.currentTimeMillis(); // 记录起始时间
        Book book = new Book();
        for (int j = 0; j<num; j++){
            book  = JSON.parseObject(jsonStr, Book.class);
        }
        long end = System.currentTimeMillis();
        log.error("fastJson循环 {} 次花费的时间为:{}", num, end-start);
    }

    static void gson(String jsonStr, int num){ long start = System.currentTimeMillis(); // 记录起始时间

        Gson gson = new Gson();
        Book book = new Book();
        for (int j = 0; j<num; j++){
            book = gson.fromJson(jsonStr, Book.class);
        }
        long end = System.currentTimeMillis();
        log.error("Gson循环 {} 次花费的时间为:{}", num, end-start);


    }

    public static void main(String[] args) throws IOException {
        String jsonStr = "{\"id\":\"2\",\"name\":\"Json技术\"}";
        fastJson(jsonStr, 50000);
        gson(jsonStr, 50000);
        jackJson(jsonStr, 50000);
        log.error("-----------------------------------------------------");
       fastJson(jsonStr, 500000);
       gson(jsonStr, 500000);
       jackJson(jsonStr, 500000);
        log.error("-----------------------------------------------------");
        fastJson(jsonStr, 800000);
        gson(jsonStr, 800000);
        jackJson(jsonStr, 800000);
        log.error("-----------------------------------------------------");
        fastJson(jsonStr, 2000000);
        gson(jsonStr, 2000000);
        jackJson(jsonStr, 2000000);
        log.error("-----------------------------------------------------");
        fastJson(jsonStr, 8000000);
        gson(jsonStr, 8000000);
        jackJson(jsonStr, 8000000);
        log.error("-----------------------------------------------------");
        fastJson(jsonStr, 200000000);
        gson(jsonStr, 200000000);
        jackJson(jsonStr, 200000000);
    }
}

测试结果：

解析二十万次（毫秒）

类型	第一次	第二次	第三次
FastJson	239	249	237
Gson	1170	1129	1156
JackSon	552	527	535

---

解析二百万次（毫秒）

类型	第一次	第二次	第三次
FastJson	2845	2420	2379
Gson	11238	11412	11247
JackSon	5917	5441	5468

---

解析二千万次（毫秒）

类型	第一次	第二次	第三次
FastJson	24182
Gson	102649
JackSon	54319

---

结论：
十万次以下，三个解析时间相差不大，
十万次以上的话，三个比例可以为：
Jackson：Gson：Fastjson = 5：11：2
所以无论什么情况下，还是Fastjson解析时间最快。