java实现http的Post、Get、代理访问请求

package com.snowfigure.kits.net; import java.io.BufferedReader; import java.io.IOException;import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStreamWriter;import java.io.UnsupportedEncodingException; import java.net.HttpURLConnection; import java.net.InetSocketAddress;import java.net.Proxy;import java.net.URL; import java.net.URLConnection;import java.util.List;import java.util.Map; /**  * Http请求工具类  * @author snowfigure  * @since 2014-8-24 13:30:56  * @version v1.0.1  */public class HttpRequestUtil {  static boolean proxySet = false;  static String proxyHost = "127.0.0.1";  static int proxyPort = 8087;  /**    * 编码    * @param source    * @return    */   public static String urlEncode(String source,String encode) {     String result = source;     try {       result = java.net.URLEncoder.encode(source,encode);     } catch (UnsupportedEncodingException e) {       e.printStackTrace();       return "0";     }     return result;   }  public static String urlEncodeGBK(String source) {     String result = source;     try {       result = java.net.URLEncoder.encode(source,"GBK");     } catch (UnsupportedEncodingException e) {       e.printStackTrace();       return "0";     }     return result;   }  /**    * 发起http请求获取返回结果    * @param req_url 请求地址    * @return    */   public static String httpRequest(String req_url) {    StringBuffer buffer = new StringBuffer();     try {       URL url = new URL(req_url);       HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();         httpUrlConn.setDoOutput(false);       httpUrlConn.setDoInput(true);       httpUrlConn.setUseCaches(false);         httpUrlConn.setRequestMethod("GET");       httpUrlConn.connect();         // 将返回的输入流转换成字符串       InputStream inputStream = httpUrlConn.getInputStream();       InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");       BufferedReader bufferedReader = new BufferedReader(inputStreamReader);         String str = null;       while ((str = bufferedReader.readLine()) != null) {         buffer.append(str);       }       bufferedReader.close();       inputStreamReader.close();       // 释放资源       inputStream.close();       inputStream = null;       httpUrlConn.disconnect();       } catch (Exception e) {       System.out.println(e.getStackTrace());     }     return buffer.toString();   }       /**    * 发送http请求取得返回的输入流    * @param requestUrl 请求地址    * @return InputStream    */   public static InputStream httpRequestIO(String requestUrl) {     InputStream inputStream = null;     try {       URL url = new URL(requestUrl);       HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();       httpUrlConn.setDoInput(true);       httpUrlConn.setRequestMethod("GET");       httpUrlConn.connect();       // 获得返回的输入流       inputStream = httpUrlConn.getInputStream();     } catch (Exception e) {       e.printStackTrace();     }     return inputStream;   }        /**   * 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);      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。   * @param isproxy   *        是否使用代理模式   * @return 所代表远程资源的响应结果   */  public static String sendPost(String url, String param,boolean isproxy) {    OutputStreamWriter out = null;    BufferedReader in = null;    String result = "";    try {      URL realUrl = new URL(url);      HttpURLConnection conn = null;      if(isproxy){//使用代理模式        @SuppressWarnings("static-access")        Proxy proxy = new Proxy(Proxy.Type.DIRECT.HTTP, new InetSocketAddress(proxyHost, proxyPort));        conn = (HttpURLConnection) realUrl.openConnection(proxy);      }else{        conn = (HttpURLConnection) realUrl.openConnection();      }      // 打开和URL之间的连接             // 发送POST请求必须设置如下两行      conn.setDoOutput(true);      conn.setDoInput(true);      conn.setRequestMethod("POST");  // POST方法                    // 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)");      conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");             conn.connect();             // 获取URLConnection对象对应的输出流      out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");      // 发送请求参数      out.write(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);      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 void main(String[] args) {    //demo:代理访问    String url = "http://api.adf.ly/api.php";    String para = "key=youkeyid&youuid=uid&advert_type=int&domain=adf.ly&url=http://somewebsite.com";         String sr=HttpRequestUtil.sendPost(url,para,true);    System.out.println(sr);  }   }