content: package com.jeespring.common.utils;
  
  import javax.servlet.http.HttpServletRequest;
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.io.PrintWriter;
  import java.net.URL;
  import java.net.URLConnection;
  import java.util.List;
  import java.util.Map;
  
  public class HttpRequest {
      /**
       * 向指定URL发送GET方法的请求
       *
       * @param url
       *            发送请求的URL
       * @param param
       *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
       * @return URL 所代表远程资源的响应结果
       */
      public static String sendGet(String url, String param) {
          String result = "";
          BufferedReader in = null;
          try {
              String urlNameString = url + "?" + param;
              URL realUrl = new URL(urlNameString);
              // 打开和URL之间的连接
              URLConnection connection = realUrl.openConnection();
              // 设置通用的请求属性
              connection.setRequestProperty("accept", "*/*");
              connection.setRequestProperty("connection", "Keep-Alive");
              connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
              // 建立实际的连接
              connection.connect();
              // 获取所有响应头字段
              //Map<String, List<String>> map = connection.getHeaderFields();
              // 遍历所有的响应头字段
              //for (String key : map.keySet()) {
                 // System.out.println(key + "--->" + map.get(key));
              //}
              // 定义 BufferedReader输入流来读取URL的响应
              in = new BufferedReader(new InputStreamReader(
                      connection.getInputStream()));
              String line;
              while ((line = in.readLine()) != null) {
                  result += line;
              }
          } catch (Exception e) {
              System.out.println("发送GET请求出现异常！" + e.toString());
              result="Down";
              //e.printStackTrace();
          }
          // 使用finally块来关闭输入流
          finally {
              try {
                  if (in != null) {
                      in.close();
                  }
              } catch (Exception e2) {
                  e2.printStackTrace();
              }
          }
          return result;
      }
  
      /**
       * 向指定 URL 发送POST方法的请求
       *
       * @param url
       *            发送请求的 URL
       * @param param
       *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
       * @return 所代表远程资源的响应结果
       */
      public static String sendPost(String url, String param) {
          PrintWriter out = null;
          BufferedReader in = null;
          String result = "";
          try {
              URL realUrl = new URL(url);
              // 打开和URL之间的连接
              URLConnection conn = realUrl.openConnection();
              // 设置通用的请求属性
              conn.setRequestProperty("accept", "*/*");
              conn.setRequestProperty("connection", "Keep-Alive");
              conn.setRequestProperty("user-agent",
                      "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
              // 发送POST请求必须设置如下两行
              conn.setDoOutput(true);
              conn.setDoInput(true);
              // 获取URLConnection对象对应的输出流
              out = new PrintWriter(conn.getOutputStream());
              // 发送请求参数
              out.print(param);
              // flush输出流的缓冲
              out.flush();
              // 定义BufferedReader输入流来读取URL的响应
              in = new BufferedReader(
                      new InputStreamReader(conn.getInputStream()));
              String line;
              while ((line = in.readLine()) != null) {
                  result += line;
              }
          } catch (Exception e) {
              System.out.println("发送 POST 请求出现异常！"+e.toString());
              //e.printStackTrace();
          }
          //使用finally块来关闭输出流、输入流
          finally{
              try{
                  if(out!=null){
                      out.close();
                  }
                  if(in!=null){
                      in.close();
                  }
              }
              catch(IOException ex){
                  ex.printStackTrace();
              }
          }
          return result;
      }
  
      public static String getParameterMapString(HttpServletRequest request){
          if(request.getQueryString()!=null){
              if(request.getQueryString().length()>0){
                  return request.getQueryString();
              }
          }
          Map map = request.getParameterMap();
          java.util.Enumeration enumx = request.getParameterNames();
          String result="";
          while(enumx.hasMoreElements()){
              String  paramName=(String)enumx.nextElement();
              String[]  values=request.getParameterValues(paramName);
              for(int  i=0;i<values.length;i++){
                  result+=paramName+"="+values[i]+"&";
              }
          }
          return result;
      }
  }