Java中将对象（实体）类转成Json格式的数据

在往常接口测试工作中都会遇到将对象（实体）类转成Json格式的数据构造成body发送给服务端，抽空对比了下几个第三方工具类的转换速度（jackson、Gson、fastjson）

步骤：

1.新建实体类Body

2.在测试用例@Test方法中统计各种第三方包的时间

上代码（代码上不了，放开源中国的Git上：https://gitee.com/veryxly/TestAPIDamo，后期这个项目慢慢做成接口测试demo）

BodyClass为实体类

TestCase为测试方法

可以用这种方法构造接口请求的body（Json类型），也可以将Json数据转换为实体。原先的做法是用map存储数据，然后对map进行转换成Json。

结论：Gson相对较快，其次是fastjson，然后jackson，以上仅实验所得数据！

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贴部分代码，主要是转换部分

@Test

public void TC_XZ_001() throws Exception{

String jsonStr;

BodyClass body = new BodyClass();

body.setAccess_token("8447ff97-9b8c-4224-9cec");

body.setCatalog("1");

body.setTag("1");

body.setPageSize("10");

body.setPage("1");

body.setDataType("json");

long startTime = System.currentTimeMillis();

ObjectMapper objectMapper = new ObjectMapper();

jsonStr = objectMapper.writeValueAsString(body);

long endTime = System.currentTimeMillis();

long userTime = endTime - startTime;

System.out.println("jackson json:"+jsonStr+";Time:"+userTime);

}

@Test

public void TC_XZ_002(){

String jsonStr;

BodyClass body = new BodyClass();

body.setAccess_token("8447ff97-9b8c-4224-9cec");

body.setCatalog("1");

body.setTag("1");

body.setPageSize("10");

body.setPage("1");

body.setDataType("json");

long startTime = System.currentTimeMillis();

Gson gson = new Gson();

jsonStr = gson.toJson(body);

long endTime = System.currentTimeMillis();

long userTime = endTime - startTime;

System.out.println("Gson json:"+jsonStr+";Time:"+userTime);

}

@Test

public void TC_XZ_003(){

Object jsonStr;

BodyClass body = new BodyClass();

body.setAccess_token("8447ff97-9b8c-4224-9cec");

body.setCatalog("1");

body.setTag("1");

body.setPageSize("10");

body.setPage("1");

body.setDataType("json");

long startTime = System.currentTimeMillis();

jsonStr = JSON.toJSON(body);

long endTime = System.currentTimeMillis();

long userTime = endTime - startTime;

System.out.println("fastjson json:"+jsonStr+";Time:"+userTime);

}

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期间怀疑jackson包用错了，试了三四个版本放弃了，是相对慢！Time单位为ms。

jackson json:{"access_token":"8447ff97-9b8c-4224-9cec","catalog":"1","tag":"1","pageSize":"10","page":"1","dataType":"json"};Time:375

Gson json:{"access_token":"8447ff97-9b8c-4224-9cec","catalog":"1","tag":"1","pageSize":"10","page":"1","dataType":"json"};Time:237

fastjson json:{"access_token":"8447ff97-9b8c-4224-9cec","catalog":"1","dataType":"json","pageSize":"10","page":"1","tag":"1"};Time:405

jackson json:{"access_token":"8447ff97-9b8c-4224-9cec","catalog":"1","tag":"1","pageSize":"10","page":"1","dataType":"json"};Time:395

Gson json:{"access_token":"8447ff97-9b8c-4224-9cec","catalog":"1","tag":"1","pageSize":"10","page":"1","dataType":"json"};Time:181

fastjson json:{"access_token":"8447ff97-9b8c-4224-9cec","catalog":"1","dataType":"json","pageSize":"10","page":"1","tag":"1"};Time:203

jackson json:{"access_token":"8447ff97-9b8c-4224-9cec","catalog":"1","tag":"1","pageSize":"10","page":"1","dataType":"json"};Time:351

Gson json:{"access_token":"8447ff97-9b8c-4224-9cec","catalog":"1","tag":"1","pageSize":"10","page":"1","dataType":"json"};Time:63

fastjson json:{"access_token":"8447ff97-9b8c-4224-9cec","catalog":"1","dataType":"json","pageSize":"10","page":"1","tag":"1"};Time:91