用java代码发送http请求

 //发送post请求
             PrintWriter out = null;
             BufferedReader in = null;
             String result = "";
             try {
                 URL realUrl = new URL("http:...........................");
                 // 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
                //参数格式如下
                 out.print("uid="+uid+"&status="+status+"&gender="+gender+"&channel="+u.getChannel());
                 // 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(),"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();
                 }
             }
             System.out.println(result);