根据对方提供的url获取对方返回的字符串信息

/* * 解析URL获取返回的字符串信息 */private  String doHttpRequest(String url) {        StringBuffer result = new StringBuffer();        BufferedReader in = null;        try {        URLConnection connection = null;            URL realUrl = new URL(url);            // 打开和URL之间的连接            connection = realUrl.openConnection();        // 发送POST请求必须设置如下两行            connection.setDoOutput(true);            connection.setDoInput(true);            // 获取URLConnection对象对应的输出流            PrintWriter out = new PrintWriter(connection.getOutputStream());                     // 定义 BufferedReader输入流来读取URL的响应            in = new BufferedReader(new InputStreamReader(connection.getInputStream(),"GBK"));            String line;            while ((line = in.readLine()) != null) {                result.append(line);                // flush输出流的缓冲                out.flush();            }        } catch (Exception e) {        }finally {// 使用finally块来关闭输入流            try {                 if (in != null) {                    in.close();                }            } catch (Exception e2) {                e2.printStackTrace();            }        }        return result.toString();}