获取https网页的内容

public static String getHtmlString(String url) {
try {
URL uri = new URL(url);
HttpsURLConnection con = (HttpsURLConnection) uri.openConnection();
con.setInstanceFollowRedirects(false);
con.setUseCaches(false);
con.setAllowUserInteraction(false);
con.setRequestProperty("User-Agent","Mozilla/5.0 (Windows NT 10.0; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0");
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) {
e.printStackTrace();
return "f";
}
}

需要注意的就是这一句模拟浏览器进行访问

con.setRequestProperty("User-Agent","Mozilla/5.0 (Windows NT 10.0; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0");