Get web site source code

public String getPageSource() {
        StringBuffer sb = new StringBuffer();
        try {
            // 构建一URL对象
            URL url = new URL(pageUrl);
            // 使用openStream得到一输入流并由此构造一个BufferedReader对象
            BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream(), pageEncode));
            String line;
            // 读取www资源
            while ((line = in.readLine()) != null) {
                sb.append(line);
            }
            in.close();
        } catch (Exception ex) {
            System.err.println(ex);
        }
        return sb.toString();
    }