/**
     *网页抓取方法
     * @param urlString      要抓取的url地址
     * @param charset        网页编码方式
     * @param timeout        超时时间

     * @return               抓取的网页内容\

      *      //http://blog.csdn.net/yjflinchong

     * @throws IOException   抓取异常
     */
    public static String GetWebContent(String urlString, final String charset, int timeout) throws IOException {

        if (urlString == null || urlString.length() == 0) {

            return null;
        }
        urlString = (urlString.startsWith("http://") || urlString.startsWith("https://")) ? urlString : ("http://" + urlString).intern();
        URL url = new URL(urlString);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setDoOutput(true);   
        conn.setRequestProperty("Pragma", "no-cache");   
        conn.setRequestProperty("Cache-Control", "no-cache");   
        //http://blog.csdn.net/yjflinchong
        int temp = Integer.parseInt(Math.round(Math.random()*7)+"");
        conn.setRequestProperty(
                "User-Agent",
                    UserAgent[temp]);  // 模拟手机系统
        conn.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");//只接受text/html类型，当然也可以接受图片,pdf,*/*任意，就是tomcat/conf/web里面定义那些
        conn.setConnectTimeout(timeout);
        try {

            if (conn.getResponseCode() != HttpURLConnection.HTTP_OK) {

                return null;
            }
        } catch (Exception e) {

            try {

                log.printException(e);
            } catch (Exception e2) {

                e2.printStackTrace();
            }
            return null;
        }
        InputStream input = conn.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(input,
                charset));
        String line = null;
        StringBuffer sb = new StringBuffer();
        while ((line = reader.readLine()) != null) {

            sb.append(line).append("\r\n");

        }

         //http://blog.csdn.net/yjflinchong

        if (reader != null) {

            reader.close();
        }
        if (conn != null) {

            conn.disconnect();
        }
        return sb.toString();
    }
    
    public static String[] UserAgent = {

        "Mozilla/5.0 (Linux; U; Android 2.2; en-us; Nexus One Build/FRF91) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.2",
        "Mozilla/5.0 (iPad; U; CPU OS 3_2_2 like Mac OS X; en-us) AppleWebKit/531.21.10 (KHTML, like Gecko) Version/4.0.4 Mobile/7B500 Safari/531.21.11",

        "Mozilla/5.0 (SymbianOS/9.4; Series60/5.0 NokiaN97-1/20.0.019; Profile/MIDP-2.1 Configuration/CLDC-1.1) AppleWebKit/525 (KHTML, like Gecko) BrowserNG/7.1.18121",

        //http://blog.csdn.net/yjflinchong

        "Nokia5700AP23.01/SymbianOS/9.1 Series60/3.0",
        "UCWEB7.0.2.37/28/998",
        "NOKIA5700/UCWEB7.0.2.37/28/977",
        "Openwave/UCWEB7.0.2.37/28/978",
        "Mozilla/4.0 (compatible; MSIE 6.0; ) Opera/UCWEB7.0.2.37/28/989"

    };

      本文转自yjflinchong 51CTO博客，原文链接：http://blog.51cto.com/yjflinchong/1164973，如需转载请自行联系原作者