Android InputStream Encoding Get getEncodingFromHTML(InputStream is)

Description

get Encoding From HTML

Declaration

public static String getEncodingFromHTML(InputStream is)
        throws IOException 

Method Source Code

//package com.java2s;

import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {

    public static String getEncodingFromHTML(InputStream is)
            throws IOException {
        final int FIND_CHARSET_CACHE_SIZE = 4 * 1024;
        BufferedInputStream bis = new BufferedInputStream(is);
        bis.mark(FIND_CHARSET_CACHE_SIZE);
        byte[] cache = new byte[FIND_CHARSET_CACHE_SIZE];
        bis.read(cache);//w w  w.  jav a 2  s . co  m
        bis.reset();
        return getHtmlCharset(new String(cache));
    }

    public static String getHtmlCharset(String content) {
        String encoding = null;
        final String CHARSET_REGX = "<meta.*charset=\"?([a-zA-Z0-9-_/]+)\"?";
        Matcher m = Pattern.compile(CHARSET_REGX).matcher(content);
        if (m.find()) {
            encoding = m.group(1);
        }
        return encoding;
    }
}

Related

1. getStreamEncoding(InputStream is)
2. getStreamEncoding(InputStream is)