关于java网络编程请求URL

　　最近在写有关java后台url请求，才明白这是java的网络编程内容，在次记录一下一套java网络编程请求url代码，基本是通用的，只要修改一下url地址、请求参数、请求方式即可。

public static String getWeixinInterface (String url) throws IOException {
           StringBuffer bufferRes = new StringBuffer();

           try {

                   URL realUrl = new URL(url);
                   System.out.println(url);
                   HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();

                   // 连接超时

                   conn.setConnectTimeout(25000);

                   // 读取超时 --服务器响应比较慢,增大时间

                   conn.setReadTimeout(25000);

                   HttpURLConnection.setFollowRedirects(true);

                   // 请求方式

                   conn.setRequestMethod("POST");

                   conn.setDoOutput(true);

                   conn.setDoInput(true);

                   conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0");
                  //已知请求url关键字
                   conn.setRequestProperty("Referer", "https://api.weixin.qq.com/");
                   
                   OutputStream os = conn.getOutputStream();

                   String param = new String();

                   param = "发送请求参数";

                   os.write(param.getBytes());

                   conn.connect();

                   // 获取URLConnection对象对应的输出流

                 

                   InputStream in = conn.getInputStream();

                   BufferedReader read = new BufferedReader(new InputStreamReader(in,"UTF-8"));

                   String valueString = null;

                   while ((valueString=read.readLine())!=null){

                           bufferRes.append(valueString);

                   }

                   System.out.println(bufferRes.toString());

                   in.close();

                   if (conn != null) {

                           // 关闭连接

                           conn.disconnect();

                   }
                   return bufferRes.toString();
           } catch (Exception e) {

                   e.printStackTrace();
                   return "";

           }                    

上面请求返回的数据是如果是XML格式，可用以下这段代码把XML格式------>map集合

public static Map doXMLParse(String strxml) throws JDOMException, IOException {
        strxml = strxml.replaceFirst("encoding=\".*\"", "encoding=\"UTF-8\"");

        if(null == strxml || "".equals(strxml)) {
            return null;
        }
        
        Map m = new HashMap();
        
        InputStream in = new ByteArrayInputStream(strxml.getBytes("UTF-8"));
        SAXBuilder builder = new SAXBuilder();
        Document doc = builder.build(in);
        Element root = doc.getRootElement();
        List list = root.getChildren();
        Iterator it = list.iterator();
        while(it.hasNext()) {
            Element e = (Element) it.next();
            String k = e.getName();
            String v = "";
            List children = e.getChildren();
            if(children.isEmpty()) {
                v = e.getTextNormalize();
            } else {
                v = XMLUtil.getChildrenText(children);
            }
            
            m.put(k, v);
        }
        
        //关闭数据流
        in.close();
        
        return m;
    }