package com.qing.qing.test;

import org.apache.commons.io.FileUtils;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

public class TestBM {
    public static void main(String[] args) {
        String path = "D:\\ytzz\\ddd.txt";
        path = "D:\\ytzz\\ddd - 副本.txt";
 
        File file = new File(path);
        if(!file.exists()){
            System.out.println("not found");
            return;
        }
        try {
            String type = getFileCharsetName(path);
            System.out.println(type);
            byte[] bytes = FileUtils.readFileToByteArray(new File(path));
 
            System.out.println(new String(bytes,type));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static String getFileCharsetName(String fileName) throws IOException {
        InputStream inputStream = new FileInputStream(fileName);
        byte[] head = new byte[3];
 
        inputStream.read(head);

        String charsetName = "GBK";//或GB2312，即ANSI
        if (head[0] == -1 && head[1] == -2 ) //0xFFFE
            charsetName = "UTF-16";
        else if (head[0] == -2 && head[1] == -1 ) //0xFEFF
            charsetName = "Unicode";//包含兩種編碼格式：UCS2-Big-Endian和UCS2-Little-Endian
        else if(head[0]==-27 && head[1]==-101 && head[2] ==-98)
            charsetName = "UTF-8"; //UTF-8(不含BOM)
        else if(head[0]==-17 && head[1]==-69 && head[2] ==-65)
            charsetName = "UTF-8"; //UTF-8-BOM
        inputStream.close();
        //System.out.println(code);
        return charsetName;

    }
}