请求一个url 获得返回结果(doPost doGet方式)

本文介绍了一个简单的Java方法，用于发送带有参数的POST请求到指定URL并接收响应内容。该方法首先构建请求URL，然后通过HttpURLConnection进行网络通信。

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public static String post(String urlStr, Map<String, String> map) {
       if (urlStr == null || map == null || map.size() == 0) {
           return null;
       }
       try {
           StringBuffer urt = new StringBuffer();
           urt.append(urlStr);
           urt.append("?");
           boolean add = true;
           for (Entry e : map.entrySet()) {
               if (add) {
                   add = false;
               } else {
                   urt.append("&");
               }
               urt.append(e.getKey());
               urt.append("=");
               urt.append(e.getValue() == null ? "" : e.getValue());
           }
           String responseContent = null;
           HttpURLConnection url_con = null;
           URL url = new URL(urt.toString());

           url_con = (HttpURLConnection) url.openConnection();
           url_con.setRequestMethod("POST");

           url_con.setDoOutput(true);

           StringBuffer params = new StringBuffer();
           byte[] b = params.toString().getBytes();
           url_con.getOutputStream().write(b, 0, b.length);
           url_con.getOutputStream().flush();
           url_con.getOutputStream().close();
           url_con.setReadTimeout(1500);
           InputStream in = url_con.getInputStream();
           BufferedReader rd = new BufferedReader(new InputStreamReader(in, "UTF-8"));
           String tempLine = rd.readLine();
           StringBuffer tempStr = new StringBuffer();
           while (tempLine != null) {
               tempStr.append(tempLine);
               tempLine = rd.readLine();
           }
           responseContent = tempStr.toString();
           rd.close();
           in.close();
   //       System.out.println(tempStr.toString());
           return tempStr.toString();
       } catch (Exception e1) {
           return null;
       }
   }