Java网络请求工具类(依赖：org.apache.http;注：HttpClient 4.4,HttpCore 4.4)
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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:访问数据库并返回数据字符串       *       * @param params       *            向服务器端传的参数       * @param url       * @return String 数据字符串       * @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));          //设置请求和传输超时时间          httpPost.setConfig(requestConfig);          CloseableHttpResponse httpResp = httpclient.execute(httpPost);          try {              int statusCode = httpResp.getStatusLine().getStatusCode();              // 判断是够请求成功              if (statusCode == HttpStatus.SC_OK) {                  System.out.println("状态码:" + statusCode);                  System.out.println("请求成功!");                  // 获取返回的数据                  result = EntityUtils.toString(httpResp.getEntity(), "UTF-8");              } else {                  System.out.println("状态码:"                          + httpResp.getStatusLine().getStatusCode());                  System.out.println("HttpPost方式请求失败!");              }          } finally {              httpResp.close();              httpclient.close();          }          return result;      }         /**       * Get:访问数据库并返回数据字符串       *       * @param url       * @return String 数据字符串       * @throws Exception       */       public static String doGet(String url) throws Exception{          String result = null;          httpclient = HttpClients.createDefault();          HttpGet httpGet = new HttpGet(url);          //设置请求和传输超时时间          httpGet.setConfig(requestConfig);          CloseableHttpResponse httpResp = httpclient.execute(httpGet);          try {              int statusCode = httpResp.getStatusLine().getStatusCode();              // 判断是够请求成功              if (statusCode == HttpStatus.SC_OK) {                  System.out.println("状态码:" + statusCode);                  System.out.println("请求成功!");                  // 获取返回的数据                  result = EntityUtils.toString(httpResp.getEntity(), "UTF-8");              } else {                  System.out.println("状态码:"                          + httpResp.getStatusLine().getStatusCode());                  System.out.println("HttpGet方式请求失败!");              }          } finally {              httpResp.close();              httpclient.close();          }          return result;       }  }