fastJson,jackJson,Gson性能比较

在Java里面，我们经常使用JSON格式的工具包对字符串或者对象进行解析，一般用得比较广泛的三种分别为：fastJson,jackJson,Gson，关于各个工具包的性能比较网络上比比皆是，在这里我只阐述在我本机环境下的测试结果，然后在根据结果对三种工具包进行一个解析，首先先贴代码：

importjava.util.Map;
importorg.codehaus.jackson.map.ObjectMapper;
importcom.alibaba.fastjson.JSONObject;
importcom.google.gson.Gson;

publicclassJsonTest1{
	privatestaticlongcount=10000;
	/**
	*@paramargs
	*@throwsException
	*/
	publicstaticvoidmain(String[]args)throwsException{
		//TODOAuto-generatedmethodstub
		gson();
		System.gc();
		jackJson();
		System.gc();
		fastJson();
		System.gc();
		System.out.println("---------------------------------------------------------------");
		gsonJson();
		System.gc();
		jackJsonJson();
		System.gc();
		fastJsonJson();
	}
	
	privatestaticlonggson(){
		Demodemo=newDemo();
		demo.setCmd("1");
		demo.setContent("dd");
		longendTime1=System.currentTimeMillis();
		
		for(inti=0;i<count;i++){
			Gsongson=newGson();
			gson.toJson(demo);
		}
		longendTime2=System.currentTimeMillis();
		System.out.println("gson--obj--json:"+(count*1000)/(endTime2-endTime1));
		returnendTime2-endTime1;
	}
	
	privatestaticlongjackJson()throwsException{
		Demodemo=newDemo();
		demo.setCmd("1");
		demo.setContent("dd");
		longendTime1=System.currentTimeMillis();
		for(inti=0;i<count;i++){
			ObjectMapperobjectMapper=newObjectMapper();
			objectMapper.writeValueAsString(demo);
		}
		longendTime2=System.currentTimeMillis();
		System.out.println("jackJson--obj--json:"+(count*1000)/(endTime2-endTime1));
		returnendTime2-endTime1;
	}
	
	
	privatestaticlongfastJson(){
		Demodemo=newDemo();
		demo.setCmd("1");
		demo.setContent("dd");

		longendTime1=System.currentTimeMillis();
		for(inti=0;i<count;i++){
			JSONObjectjsonObject=newJSONObject();
			jsonObject.toJSON(demo);
		}
		longendTime2=System.currentTimeMillis();
		System.out.println("fastJson--obj--json:"+(count*1000)/(endTime2-endTime1));
		returnendTime2-endTime1;
	}
	
	privatestaticlonggsonJson(){
		Stringjson="{"cmd":"1","sss":"dd"}";
		
		longendTime1=System.currentTimeMillis();
		
		for(inti=0;i<count;i++){
		Gsongson=newGson();
		gson.fromJson(json,Map.class);
		}
		longendTime2=System.currentTimeMillis();
		System.out.println("gson--json--obj:"+(count*1000)/(endTime2-endTime1));
		returnendTime2-endTime1;
	}
	
	privatestaticlongjackJsonJson()throwsException{
		Stringjson="{"cmd":"1","sss":"dd"}";
	
		longendTime1=System.currentTimeMillis();
		for(inti=0;i<count;i++){
			ObjectMapperobjectMapper=newObjectMapper();
			objectMapper.readValue(json,Map.class);
		}
		longendTime2=System.currentTimeMillis();
		System.out.println("jackJson--json--obj:"+(count*1000)/(endTime2-endTime1));
		returnendTime2-endTime1;
	}
	
	
	privatestaticlongfastJsonJson(){
		Stringjson="{"cmd":"1","sss":"dd"}";
	
		longendTime1=System.currentTimeMillis();
		for(inti=0;i<count;i++){
			JSONObjectjsonObject=newJSONObject();
			jsonObject.parSEObject(json,Map.class);
		}
		longendTime2=System.currentTimeMillis();
		System.out.println("fastJson--json--obj:"+(count*1000)/(endTime2-endTime1));
		returnendTime2-endTime1;
	}

}
classDemo{
	privateStringcmd;
	privateStringcontent;
	publicStringgetCmd(){
		returncmd;
	}
	publicvoidsetCmd(Stringcmd){
		this.cmd=cmd;
	}
	publicStringgetContent(){
		returncontent;
	}
	publicvoidsetContent(Stringcontent){
		this.content=content;
	}
}

运行结果如下：

我们可以看到fastJson的速度明显高于其他两个，真的是这样的吗？我们把代码在改进一下。

importjava.util.Map;
importorg.codehaus.jackson.map.ObjectMapper;
importcom.alibaba.fastjson.JSONObject;
importcom.google.gson.Gson;

publicclassJsonTest{

	privatestaticObjectMapperobjectMapper=newObjectMapper();
	
	privatestaticGsongson=newGson();
	
	privatestaticJSONObjectjsonObject=newJSONObject();
	

	privatestaticlongcount=10000;
	/**
	*@paramargs
	*@throwsException
	*/
	publicstaticvoidmain(String[]args)throwsException{
		//TODOAuto-generatedmethodstub
		gson();
		System.gc();
		jackJson();
		System.gc();
		fastJson();
		System.gc();
		System.out.println("---------------------------------------------------------------");
		gsonJson();
		System.gc();
		jackJsonJson();
		System.gc();
		fastJsonJson();
	}
	
	privatestaticlonggson(){
		Demodemo=newDemo();
		demo.setCmd("1");
		demo.setContent("dd");
		longendTime1=System.currentTimeMillis();
		
		for(inti=0;i<count;i++){
			gson.toJson(demo);
		}
		longendTime2=System.currentTimeMillis();
		System.out.println("gson--obj--json:"+(count*1000)/(endTime2-endTime1));
		returnendTime2-endTime1;
	}
	
	privatestaticlongjackJson()throwsException{
		Demodemo=newDemo();
		demo.setCmd("1");
		demo.setContent("dd");
		longendTime1=System.currentTimeMillis();
		for(inti=0;i<count;i++){
			objectMapper.writeValueAsString(demo);
		}
		longendTime2=System.currentTimeMillis();
		System.out.println("jackJson--obj--json:"+(count*1000)/(endTime2-endTime1));
		returnendTime2-endTime1;
	}
	
	
	privatestaticlongfastJson(){
		Demodemo=newDemo();
		demo.setCmd("1");
		demo.setContent("dd");

		longendTime1=System.currentTimeMillis();
		for(inti=0;i<count;i++){
			jsonObject.toJSON(demo);
		}
		longendTime2=System.currentTimeMillis();
		System.out.println("fastJson--obj--json:"+(count*1000)/(endTime2-endTime1));
		returnendTime2-endTime1;
	}
	
	privatestaticlonggsonJson(){
		Stringjson="{"cmd":"1","sss":"dd"}";
		
		longendTime1=System.currentTimeMillis();
		
		for(inti=0;i<count;i++){
		gson.fromJson(json,"sss":"dd"}";
	
		longendTime1=System.currentTimeMillis();
		for(inti=0;i<count;i++){
			objectMapper.readValue(json,"sss":"dd"}";
	
		longendTime1=System.currentTimeMillis();
		for(inti=0;i<count;i++){
			jsonObject.parSEObject(json,Map.class);
		}
		longendTime2=System.currentTimeMillis();
		System.out.println("fastJson--json--obj:"+(count*1000)/(endTime2-endTime1));
		returnendTime2-endTime1;
	}


}

classDemo{
	privateStringcmd;
	privateStringcontent;
	publicStringgetCmd(){
		returncmd;
	}
	publicvoidsetCmd(Stringcmd){
		this.cmd=cmd;
	}
	publicStringgetContent(){
		returncontent;
	}
	publicvoidsetContent(Stringcontent){
		this.content=content;
	}
}

运行结果如下：

结论：

• 在做了初始化的情况下GSON的速度都是最快的。

• 在使用GSON或jackJson做Json处理时最好有个全局的解析对象，不要每次调用的时候都去生成那样对性能的影响很大，另外经过测试，这里面没有线程安全问题。

• fastJson在json转化为对象的应用场景下性能比较突出

本次的jar版本为：

fastJson版本为1.1.41

GSON：2.1

O

（编辑：李大同）

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