HttpClient CloseableHttpClient GetMethod PostMethod http

pom依赖

<!--HttpClient的依赖--> <dependency> <groupId>commons-httpclient</groupId> <artifactId>commons-httpclient</artifactId> <version>3.1</version> </dependency> <!--CloseableHttpClient的依赖--> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.2</version> </dependency>

HttpClient 的get请求方式

private static void doGet() { HttpClient client = new HttpClient(); GetMethod getMethod = new GetMethod("https://www.thepaper.cn/"); int code = 0; try { code = client.executeMethod(getMethod); // 返回StatusCode，即状态码 if (code == 200) { String res = getMethod.getResponseBodyAsString(); // 这个代码，没太理解。 System.out.println(res); } } catch (IOException e) { e.printStackTrace(); } } idea运行结果：

postman调试结果：

HttpClient 的post请求方式

private static void doPost() { String praiseUrl = "https://www.thepaper.cn/www/commentPraise.msp"; // 澎湃新闻评论点赞url HttpClient client = new HttpClient(); // httpClient PostMethod postMethod = new PostMethod(praiseUrl); // postMethod // 必须设置下面这个Header 设置请求头 postMethod.addRequestHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 " + "(KHTML, like Gecko) Chrome/58.0.3029.81 Safari/537.36"); postMethod.addParameter("commentId", "18718372"); // 评论的id，抓包获得 try { int code = client.executeMethod(postMethod); // 获取返回码。 if (code == 200) { String res = postMethod.getResponseBodyAsString(); // 获取响应的 响应体。 System.out.println(res); } } catch (IOException e) { e.printStackTrace(); } } idea运行结果：

post请求结果：

CloseableHttpClient的get请求方式

public static void doGet() { CloseableHttpClient client = HttpClientBuilder.create().build(); // 获取http客户端。 HttpGet get = new HttpGet("http://www.thepaper.cn"); // 建立httpGet try { // 很奇怪，使用CloseableHttpClient来请求澎湃新闻的首页，GTE请求也必须加上下面这个Header，但是使用HTTPClient则不需要 get.addHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like " + "Gecko) Chrome/58.0.3029.81 Safari/537.36"); // 加上请求头 HttpResponse response = client.execute(get); // 获取响应。response String res = EntityUtils.toString(response.getEntity()); // 获取响应体。 System.out.println(res); } catch (IOException e) { e.printStackTrace(); } }

CloseableHttpClient的post请求方式

public static void doPost() { CloseableHttpClient client = HttpClientBuilder.create().build(); HttpPost post = new HttpPost("https://www.thepaper.cn/www/commentPraise.msp"); try { post.addHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like " + "Gecko) Chrome/58.0.3029.81 Safari/537.36"); List<NameValuePair> params = new ArrayList<>(); params.add(new BasicNameValuePair("commentId", "18718372")); post.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8)); HttpResponse response = client.execute(post); String res = EntityUtils.toString(response.getEntity()); System.out.println(res); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }