写在前面为什么写这篇文章，源于和朋友聊天，又触动了我的知识盲点，先来一波面向百度的学习，直接根据两者的区别和性能对比搜索关键字httpclient和okhttp，没有找到我想要的答案，所以我去overstackflow看看有没有人问过这个问题，真的不会让你失望的。所以从用法、性能、超时配置等方面进行比较。HttpClient和OkHttp一般用于调用其他服务。一般服务暴露的接口是http，http常见的请求类型有GET、PUT、POST、DELETE。因此，我们主要介绍HttpClient对这些请求类型的使用。使用HttpClient发送请求的介绍主要分为以下几个步骤：创建一个CloseableHttpClient对象或者CloseableHttpAsyncClient对象，前者是同步的，后者是异步创建的Http请求对象。调用execute方法来执行请求。如果是异步请求，执行前需要调用start方法创建连接：CloseableHttpClienthttpClient=HttpClientBuilder.create().build();连接是同步的ConnectionGET请求：@TestpublicvoidtestGet()throwsIOException{Stringapi="/api/files/1";Stringurl=String.format("%s%s",BASE_URL,api);HttpGethttpGet=newHttpGet(url);CloseableHttpResponseresponse=httpClient。execute(httpGet);System.out.println(EntityUtils.toString(response.getEntity()));}使用HttpGet表示连接是GET请求，HttpClient调用execute方法发送一个GET请求和一个PUT请求：@TestpublicvoidtestPut()throwsIOException{Stringapi="/api/user";Stringurl=String.format("%s%s",BASE_URL,api);HttpPuthttpPut=newHttpPut(url);UserVOuserVO=UserVO.builder().name("h2t").id(16L).build();httpPut.setHeader("Content-Type","application/json;charset=utf8");httpPut.setEntity(newStringEntity(JSONObject.toJSONString(userVO),"UTF-8"));CloseableHttpResponseresponse=httpClient.execute(httpPut);System.out.println(EntityUtils.toString(response.getEntity())));}POST请求：添加对象@TestpublicvoidtestPost()throwsIOException{Stringapi="/api/user";Stringurl=String.format("%s%s",BASE_URL,api);HttpPosthttpPost=newHttpPost(url);UserVOuserVO=UserVO.builder().name("h2t2").build();httpPost.setHeader("Content-Type","application/json;charset=utf8");httpPost.setEntity(newStringEntity(JSONObject.toJSONString(userVO),"UTF-8"));CloseableHttpResponseresponse=httpClient.execute(httpPost);System.out.println(EntityUtils.toString(response.getEntity()));}这个请求是一个创建对象的请求，需要传入一个json串上传文件@TestpublicvoidtestUpload1()throwsIOException{Stringapi="/api/files/1";Stringurl=String.format("%s%s",BASE_URL,api);HttpPosthttpPost=newHttpPost(url);Filefile=newFile("C:/Users/hetiantian/Desktop/学习/docker_practice.pdf");FileBodyfileBody=newFileBody(file);MultipartEntityBuilderbuilder=MultipartEntityBuilder.create();builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);builder.addPart("file",fileBody);//addPart上传文件HttpEntityentity=builder.build();httpPost.setEntity(entity);CloseableHttpResponseresponse=httpClient.execute(httpPost);System.out.println(EntityUtils.toString(response.getEntity()));}通过addPart上传文件DELETE请求：@TestpublicvoidtestDelete()throwsIOException{Stringapi="/api/user/12";Stringurl=String.format("%s%s",BASE_URL,api);HttpDeletehttpDelete=newHttpDelete(url);CloseableHttpResponseresponse=httpClient.execute(httpDelete);System.out.println(EntityUtils.toString(response.getEntity())));}取消请求：@TestpublicvoidtestCancel()throwsIOException{Stringapi="/api/files/1";Stringurl=String.format("%s%s",BASE_URL,api);HttpGethttpGet=newHttpGet(url);httpGet.setConfig(requestConfig);//设置超时//测试连接取消1000){httpGet.abort();System.out.println("taskcanceled");break;}}System.out.println(EntityUtils.toString(response.getEntity()));}调用abort方法取消请求执行Result:taskcanceledcost8098mscDisconnectedfromthetargetVM,address:'127.0.0.1:60549',transport:'socket'java.net.SocketException:socketclosed...[略]使用OkHttp使用OkHttp发送请求主要分为以下几个步骤：创建一个OkHttpClient对象创建一个Request对象，将Request对象封装为一个Call，通过Call进行同步或异步请求，调用execute方法同步执行，调用enqueue方法异步执行创建连接：privateOkHttpClientclient=newOkHttpClient();GET请求：@TestpublicvoidtestGet()throwsIOException{Stringapi="/api/files/1";Stringurl=String.format("%s%s",BASE_URL,api);Requestrequest=newRequest.Builder().url(url).get().build();finalCallcall=client.newCall(request);Responseresponse=call.execute();System.out.println(response.body().string());}PUT请求：@TestpublicvoidtestPut()throwsIOException{Stringapi="/api/user";Stringurl=String.format("%s%s",BASE_URL,api);//请求参数UserVOuserVO=UserVO.builder().name("h2t").id(11L).build();RequestBodyrequestBody=RequestBody.create(MediaType.parse("application/json;charset=utf-8"),JSONObject.toJSONString(userVO));Requestrequest=newRequest.Builder().url(url).put(requestBody).build();finalCallcall=client.newCall(request);Responseresponse=调用。execute();System.out.println(response.body().string());}POST请求：添加对象@TestpublicvoidtestPost()throwsIOException{Stringapi="/api/user";Stringurl=String.format("%s%s",BASE_URL,api);//请请求参数JSONObjectjson=newJSONObject();json.put("name","hetiantian");RequestBodyrequestBody=RequestBody.create(MediaType.parse("application/json;charset=utf-8"),String.valueOf(json));Requestrequest=newRequest.Builder().url(url).post(requestBody)//post请求.build();finalCallcall=client.newCall(request);Responseresponse=call.execute();System.out.println(response.body().string());}上传文件@TestpublicvoidtestUpload()throwsIOException{Stringapi="/api/files/1";Stringurl=String.format("%s%s",BASE_URL,api);RequestBodyrequestBody=newMultipartBody.Builder().setType(MultipartBody.FORM).addFormDataPart("file","docker_practice.pdf",RequestBody.create(MediaType.parse("multipart/form-data"),newFile("C:/Users/hetiantian/Desktop/学习/docker_practice.pdf"))).build();Requestrequest=newRequest.Builder().url(url).post(requestBody)//默认为GET请求，可以不写.build();finalCallcall=client.newCall(request);Responseresponse=call.execute();System.out.println(response.body().string());}使用addFormDataPart方法模拟一个表单上传文件DELETE请求：@TestpublicvoidtestDelete()throwsIOException{Stringurl=String.format("%s%s",BASE_URL,api);//请求参数Requestrequest=newRequest.Builder().url(url).delete().build();finalCallcall=client.newCall(request);Responseresponse=call.execute();System.out.println(response.body().string());}请求取消:@TestpublicvoidtestCancelSysnc()throwsIOException{Stringapi="/api/files/1";Stringurl=String.format("%s%s",BASE_URL,api);Requestrequest=newRequest.Builder().url(url)。get().build();finalCallcall=client.newCall(request);Responseresponse=call.execute();longstart=System.currentTimeMillis();//取消测试连接while(true){//1分钟搞定no到达结果时，取消请求if(System.currentTimeMillis()-start>1000){call.cancel();System.out.println("taskcanceled");break;}}System.out.println(response.body().string());}调用cancel方法取消测试结果：taskcanceledcost9110mscjava.net.SocketException:socketclosed...[省略]总结OkHttp使用build方式创建对象更简洁，使用.post/.delete/.put/.get方法表示请求类型。不需要像HttpClient一样创建HttpGet、HttpPost等方法来创建请求类型依赖包。如果HttpClient需要发送异步请求和实现文件上传，需要引入额外的异步请求依赖
