常用工具類--HttpClient常用請求(Post/Get)
阿新 • • 發佈:2018-12-11
HttpClient請求獲取資料
引入相應的包
import org.apache.http.NameValuePair; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.client.utils.URIBuilder; import org.apache.http.entity.ContentType; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.message.BasicNameValuePair; import org.apache.http.util.EntityUtils; import java.io.IOException; import java.net.URI; import java.util.ArrayList; import java.util.List; import java.util.Map;
Get方式請求:
public static String doGet(String url, Map<String, String> param) { // 建立Httpclient物件 CloseableHttpClient httpclient = HttpClients.createDefault(); String resultString = ""; CloseableHttpResponse response = null; try { // 建立uri URIBuilder builder = new URIBuilder(url); if (param != null) { for (String key : param.keySet()) { builder.addParameter(key, param.get(key)); } } URI uri = builder.build(); // 建立http GET請求 HttpGet httpGet = new HttpGet(uri); // 執行請求 response = httpclient.execute(httpGet); // 判斷返回狀態是否為200 if (response.getStatusLine().getStatusCode() == 200) { resultString = EntityUtils.toString(response.getEntity(), "UTF-8"); } } catch (Exception e) { e.printStackTrace(); } finally { try { if (response != null) { response.close(); } httpclient.close(); } catch (IOException e) { e.printStackTrace(); } } return resultString; }
無引數get方式呼叫
public static String doGet(String url) {
return doGet(url, null);
}
java程式碼中使用:
String resultJson = HttpClientUtil.doGet(READ_BASE_OPENID_URL + params);
Post方式請求
public static String doPost(String url, Map<String, String> param) { // 建立Httpclient物件 CloseableHttpClient httpClient = HttpClients.createDefault(); CloseableHttpResponse response = null; String resultString = ""; try { // 建立Http Post請求 HttpPost httpPost = new HttpPost(url); // 建立引數列表 if (param != null) { List<NameValuePair> paramList = new ArrayList<>(); for (String key : param.keySet()) { paramList.add(new BasicNameValuePair(key, param.get(key))); } // 模擬表單 UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList); httpPost.setEntity(entity); } // 執行http請求 response = httpClient.execute(httpPost); resultString = EntityUtils.toString(response.getEntity(), "utf-8"); } catch (Exception e) { e.printStackTrace(); } finally { try { response.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return resultString; }
無引數Post方法
public static String doPost(String url) {
return doPost(url, null);
}
java程式碼中呼叫
String resultJson = HttpClientUtil.doPost(READ_BASE_OPENID_URL + params);
以Json方式返回資料傳遞引數並返回結果
public static String doPostJson(String url, String json) throws Exception {
// 建立Httpclient物件
CloseableHttpClient httpClient = HttpClients.createDefault();
CloseableHttpResponse response = null;
String resultString = "";
try {
// 建立Http Post請求
HttpPost httpPost = new HttpPost(url);
// 建立請求內容
StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
httpPost.setEntity(entity);
// 執行http請求
response = httpClient.execute(httpPost);
resultString = EntityUtils.toString(response.getEntity(), "utf-8");
} catch (Exception e) {
//e.printStackTrace();
throw e;
} finally {
try {
response.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return resultString;
}