Android File Encode Guess guessEncoding(File file)

Description

guess Encoding

Parameter

Parameter	Description
file	a parameter

Declaration

public static String guessEncoding(File file) 

Method Source Code

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

public class Main{
    private static final String ENCODE_GBK = "GBK";
    private static final String ENCODE_UTF8 = "UTF-8";
    /**// ww  w.  j a va  2 s  . c o  m
     * 
     * @param inputStream
     * @return
     */
    public static String guessEncoding(InputStream inputStream) {
        try {
            byte[] rs = getFileByte(inputStream);
            String str = new String(rs, ENCODE_UTF8);
            if (str.equals(new String(str.getBytes(), ENCODE_UTF8))) {
                return ENCODE_UTF8;
            } else {
                str = new String(rs, ENCODE_GBK);
                if (str.equals(new String(str.getBytes(), ENCODE_GBK))) {
                    return ENCODE_GBK;
                }
            }
        } catch (Exception e) {
        }
        return null;
    }
    /**
     * 
     * @param file
     * @return
     */
    public static String guessEncoding(File file) {
        FileInputStream fis = null;
        try {
            fis = new FileInputStream(file);
            return FileUtil.guessEncoding(fis);
        } catch (Exception e) {
            return null;
        } finally {
            if (fis != null) {
                try {
                    fis.close();
                } catch (Exception ex) {
                }
                ;
                fis = null;
            }
        }
    }
    /**
     * 
     * @param inputStream
     * @return
     * @throws Exception
     */
    public static byte[] getFileByte(InputStream inputStream)
            throws Exception {
        InputStream fis = null;
        ByteArrayOutputStream sb = null;
        try {
            fis = inputStream;
            sb = new ByteArrayOutputStream();
            byte[] bytes = new byte[128];
            int n = -1;
            n = fis.read(bytes);
            while (n > -1) {
                sb.write(bytes, 0, n);
                n = fis.read(bytes);
            }
            byte[] rs = sb.toByteArray();
            return rs;
        } catch (Exception e) {
            throw e;
        } finally {
            if (fis != null) {
                fis.close();
                fis = null;
            }
            if (sb != null) {
                sb.close();
                sb = null;
            }
        }
    }
}

Related

1. guessEncoding(InputStream inputStream)
2. guessEncoding(File file)
3. getEncodingOfXml(File file)