java 获取URL链接 内容

public static String getHtmlConentByUrl(String ssourl) {
try {
URL url = new URL(ssourl);
HttpURLConnection con = (HttpURLConnection) url.openConnection();

con.setInstanceFollowRedirects(false);
con.setUseCaches(false);
con.setAllowUserInteraction(false);
con.connect();
StringBuffer sb = new StringBuffer();
String line = "";
BufferedReader URLinput = new BufferedReader(new InputStreamReader(con.getInputStream()));
while ((line = URLinput.readLine()) != null) {
sb.append(line);
}
con.disconnect();

return sb.toString().toLowerCase();

} catch (Exception e) {

return null;
}

}