Java之网络请求工具类(依赖：org.apache.http;注：HttpClient 4.4,HttpCore 4.4)

到此处可以去下载依赖包：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: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;
      }
 }