HttpClient4.x工具獲取如何使用

HttpClient4.x工具能夠讓咱們輸入url,就能夠請求某個頁面(我的感受挺實用的,特別是封裝在代碼中)

首先咱們須要在maven工程中添加依賴

<dependency>

                <groupId>org.apache.httpcomponents</groupId>

                <artifactId>httpclient</artifactId>

                <version>4.5.3</version>

            </dependency>

            <dependency>

                <groupId>org.apache.httpcomponents</groupId>

                <artifactId>httpmime</artifactId>

                <version>4.5.2</version>

            </dependency>

 

            <dependency>

                <groupId>commons-codec</groupId>

                <artifactId>commons-codec</artifactId>

            </dependency>

            <dependency>

                <groupId>commons-logging</groupId>

                <artifactId>commons-logging</artifactId>

                <version>1.1.1</version>

            </dependency>

                    <dependency>

                    <groupId>org.apache.httpcomponents</groupId>

                    <artifactId>httpcore</artifactId>

            </dependency>

 

 

        <!-- gson工具，封裝http的時候使用 -->

        <dependency>

            <groupId>com.google.code.gson</groupId>

            <artifactId>gson</artifactId>

            <version>2.8.0</version>

        </dependency>

 

接下來,咱們來封裝一下,有get/post請求

 1 /**
 2 * 封裝http get post  3 */
 4 public class HttpUtils {  5 
 6 private static final Gson gson = new Gson();  7 /**
 8 * get方法  9 */
10 public static Map<String,Object> doget(String url,int timeout){ 11 Map<String,Object> map = new HashMap<>(); 12 CloseableHttpClient httpClient = HttpClients.createDefault();
　　//配置無關緊要,根據我的情景 13 RequestConfig requestConfig = RequestConfig.custom().setConnectionRequestTimeout(timeout) //設置鏈接超時時間
14 .setConnectionRequestTimeout(timeout) //設置請求超時時間
15 .setSocketTimeout(timeout) 16 .setRedirectsEnabled(true) //設置容許自動重定向
17 .build(); 1819 HttpGet httpGet = new HttpGet(url); 20 httpGet.setConfig(requestConfig); 21 
22 try { 23 HttpResponse httpResponse = httpClient.execute(httpGet); 24 if(httpResponse.getStatusLine().getStatusCode() == 200){ 25 String jsonResult = EntityUtils.toString(httpResponse.getEntity()); 26 map = gson.fromJson(jsonResult, map.getClass()); //經過gson工具,將響應流轉換成map集合 27 } 28 
29 }catch(Exception e){ 30 e.printStackTrace(); 31 }finally{ 32 try{ 33 httpClient.close(); 34 }catch(Exception e) { 35 e.printStackTrace(); 36 } 37 } 38 return map; 39 } 40 /**
41 * 封裝post,與get有殊途同歸之妙 42 */
43 public static String dopost(String url,String data,int timeout){ 44 CloseableHttpClient httpClient = HttpClients.createDefault(); 45 RequestConfig requestConfig = RequestConfig.custom().setConnectionRequestTimeout(timeout) //設置鏈接超時
46 .setConnectionRequestTimeout(timeout) //設置請求超時
47 .setRedirectsEnabled(true) //設置容許自動重定向
48 .build(); 49 
50 HttpPost httpPost = new HttpPost(url); 51 httpPost.setConfig(requestConfig); 52 httpPost.addHeader("Content-Type","text/html; chartset=UTF-8"); //添加頭信息
53 if (data != null && data instanceof String) {//使用字符串傳參
54 StringEntity stringEntity = new StringEntity(data, "UTF-8"); 55 httpPost.setEntity(stringEntity); 56 } 57 try { 58 CloseableHttpResponse httpResponse = httpClient.execute(httpPost); 59 HttpEntity httpEntity = httpResponse.getEntity(); 60 if (httpResponse.getStatusLine().getStatusCode() == 200){ 61 String result = EntityUtils.toString(httpEntity); 62 return result; 63 } 64 } catch (Exception e) { 65 e.printStackTrace(); 66 }finally { 67 try{ 68 httpClient.close(); 69 }catch (Exception e){ 70 e.printStackTrace(); 71 } 72 } 73 
74 return null; 75 
76 } 77 }

封裝好HttpClient工具後,咱們來調用一下

get請求

HttpUtils.doget(請求地址,請求時間(timeout));

post請求

HttpUtils.dopost(請求地址, 請求傳的數據(傳以前須要轉換成string), 請求時間(timeout));