一:什么是HttpClient？

主要是模擬瀏覽器發送請求給server，監聽響應信息，推斷返回結果的正確性怎樣，因為避開的瀏覽器的UI ，也就將瀏覽器中全部載入的時間（比方常常要載入圖片啊）都省掉了，所以這個運行效率相當高

二. 使用HttpClient

1.get請求

@Testpublic void doGet() throws Exception {//創建一個httpclient對象CloseableHttpClient httpClient = HttpClients.createDefault();//創建一個GET對象HttpGet get = new HttpGet("http://www.sogou.com");//執行請求CloseableHttpResponse response = httpClient.execute(get);//取響應的結果int statusCode = response.getStatusLine().getStatusCode();System.out.println(statusCode);HttpEntity entity = response.getEntity();String string = EntityUtils.toString(entity, "utf-8");System.out.println(string);//關閉httpclientresponse.close();httpClient.close();}

2.帶參數的get請求

@Testpublic void doGetWithParam() throws Exception{//創建一個httpclient對象CloseableHttpClient httpClient = HttpClients.createDefault();//創建一個uri對象URIBuilder uriBuilder = new URIBuilder("http://www.sogou.com/web");uriBuilder.addParameter("query", "花千骨");HttpGet get = new HttpGet(uriBuilder.build());//執行請求CloseableHttpResponse response = httpClient.execute(get);//取響應的結果int statusCode = response.getStatusLine().getStatusCode();System.out.println(statusCode);HttpEntity entity = response.getEntity();String string = EntityUtils.toString(entity, "utf-8");System.out.println(string);//關閉httpclientresponse.close();httpClient.close();}

3.post請求

@Testpublic void doPost() throws Exception {CloseableHttpClient httpClient = HttpClients.createDefault();//創建一個post對象HttpPost post = new HttpPost("http://localhost:8082/httpclient/post.html");//執行post請求CloseableHttpResponse response = httpClient.execute(post);String string = EntityUtils.toString(response.getEntity());System.out.println(string);response.close();httpClient.close();}

4.帶參數的post請求

@Testpublic void doPostWithParam() throws Exception{CloseableHttpClient httpClient = HttpClients.createDefault();//創建一個post對象HttpPost post = new HttpPost("http://localhost:8082/httpclient/post.html");//創建一個Entity。模擬一個表單List<NameValuePair> kvList = new ArrayList<>();kvList.add(new BasicNameValuePair("username", "zhangsan"));kvList.add(new BasicNameValuePair("password", "123"));//包裝成一個Entity對象StringEntity entity = new UrlEncodedFormEntity(kvList, "utf-8");//設置請求的內容post.setEntity(entity);//執行post請求CloseableHttpResponse response = httpClient.execute(post);String string = EntityUtils.toString(response.getEntity());System.out.println(string);response.close();httpClient.close();}

總結

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