java 中http请求为了防止乱码解决方案

packagecom.lrdd.utils;

importjava.io.BufferedReader;

importjava.io.IOException;

importjava.io.InputStreamReader;

importjava.io.OutputStreamWriter;

importjava.io.PrintWriter;

importjava.net.URL;

importjava.net.URLConnection;

importjava.util.List;

importjava.util.Map;

publicclassHttpRequest {

  /**

   * 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

   */

  publicstaticString sendGet(String url, String param) {

    String result ="";

    BufferedReader in =null;

    try{

      String urlNameString = url +"?"+ param;

      URL realUrl =newURL(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> 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 =newBufferedReader(newInputStreamReader(

          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();

      }

    }

    returnresult;

  }

  /**

   * 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

   */

  publicstaticString sendPost(String url, String param) {

    PrintWriter out =null;

    BufferedReader in =null;

    String result ="";

    try{

      URL realUrl =newURL(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 =newPrintWriter(newOutputStreamWriter(conn.getOutputStream(),"utf-8"));

      // 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 =newBufferedReader(

          newInputStreamReader(conn.getInputStream(),"utf-8"));

      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();

      }

    }

    returnresult;

  } 

}