HttpClient入门

简介

HttpClient 是 Apache HttpComponents 项目中的一个开源的 Java HTTP 客户端库，用于发送 HTTP 请求和处理 HTTP 响应。它提供了一组强大而灵活的 API，使得在 Java 程序中执行 HTTP 请求变得相对简单

maven依赖

org.apache.httpcomponents httpclient 4.5.2

或者导入阿里云oss

com.aliyun.oss aliyun-sdk-oss

里面包含了httpclient

核心API:-

HttpClient.
HttpClients
CloseableHttpClient.
HttpGet
HttpPost

发送请求步骤

创建HttpClient对象

创建http请求对象

调用HttpClient的execute方法发送请求

示例get

  @Testpublic void httpGetTest() throws IOException {//获取创建HttpClient对象HttpClient httpClient = HttpClients.createDefault();//创建http请求对象HttpGet httpGet = new HttpGet("http://localhost:8080/user/shop/status");//调用HttpClient的execute方法发送请求，并获得响应HttpResponse response = httpClient.execute(httpGet);//获得响应的状态码int statusCode = response.getStatusLine().getStatusCode();System.out.println(statusCode);//获得响应体HttpEntity entity = response.getEntity();System.out.println(entity);}

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示例post

@Testpublic void httpPostTest() throws IOException, JSONException {//获取创建HttpClient对象CloseableHttpClient httpClient = HttpClients.createDefault();//创建http请求对象HttpPost httpPost = new HttpPost("http://localhost:8080/admin/employee/login");JSONObject jsonObject = new JSONObject();//封装数据形式jsonObject.put("username","admin");jsonObject.put("password","123456");StringEntity stringEntity = new StringEntity(jsonObject.toString());stringEntity.setContentEncoding("utf8");stringEntity.setContentType("application/json");httpPost.setEntity(stringEntity);//调用HttpClient的execute方法发送请求，并获得响应CloseableHttpResponse response = httpClient.execute(httpPost);int statusCode = response.getStatusLine().getStatusCode();System.out.println(statusCode);HttpEntity entity = response.getEntity();System.out.println(entity);}