Java網絡請求工具類

Java網絡請求工具類(依賴：org.apache.http;注：HttpClient 4.4,HttpCore 4.4)
到此處可以去下載依賴包：http://hc.apache.org/downloads.cgi

import java.util.List;

import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.config.RequestConfig;
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.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
/**

HttpServletUtil
*
@author ysj
@Date: 2015-1-30 下午2:07:55
*/
public class HttpServletUtil {
 private static CloseableHttpClient httpclient;
 private static RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(5000).setConnectTimeout(5000).build();
/**

Post:訪問數據庫并返回數據字符串
*
@param params
向服務器端傳的參數
@param url
@return String 數據字符串
@throws Exception
*/
public static String doPost(List<NameValuePair> params, String url) throws Exception {
 String result = null;
 httpclient = HttpClients.createDefault();
 HttpPost httpPost = new HttpPost(url);
 httpPost.setEntity(new UrlEncodedFormEntity(params));
 //設置請求和傳輸超時時間
 httpPost.setConfig(requestConfig);
 CloseableHttpResponse httpResp = httpclient.execute(httpPost);
 try {

 int statusCode = httpResp.getStatusLine().getStatusCode();
 // 判斷是夠請求成功
 if (statusCode == HttpStatus.SC_OK) {
     System.out.println("狀態碼:" + statusCode);
     System.out.println("請求成功!");
     // 獲取返回的數據
     result = EntityUtils.toString(httpResp.getEntity(), "UTF-8");
 } else {
     System.out.println("狀態碼:"
             + httpResp.getStatusLine().getStatusCode());
     System.out.println("HttpPost方式請求失敗!");
 }

} finally {

 httpResp.close();
 httpclient.close();

}
 return result;
}
/**

Get:訪問數據庫并返回數據字符串
*
@param url
@return String 數據字符串
@throws Exception
*/
public static String doGet(String url) throws Exception{
 String result = null;
 httpclient = HttpClients.createDefault();
 HttpGet httpGet = new HttpGet(url);
 //設置請求和傳輸超時時間
 httpGet.setConfig(requestConfig);
 CloseableHttpResponse httpResp = httpclient.execute(httpGet);
 try {
 int statusCode = httpResp.getStatusLine().getStatusCode();
 // 判斷是夠請求成功
 if (statusCode == HttpStatus.SC_OK) {
     System.out.println("狀態碼:" + statusCode);
     System.out.println("請求成功!");
     // 獲取返回的數據
     result = EntityUtils.toString(httpResp.getEntity(), "UTF-8");
 } else {
     System.out.println("狀態碼:"
             + httpResp.getStatusLine().getStatusCode());
     System.out.println("HttpGet方式請求失敗!");
 }

 } finally {
 httpResp.close();
 httpclient.close();

 }
 return result;
}
}</pre>