前言：
文本文件是我们在windows平台下常用的一种文件格式，
这种格式会随着操作系统的语言不同，而出现其默认的编码不同
那么如何使用程序获取“文本文件”的编码方式呢？
文件编码的格式决定了文件可存储的字符类型，所以得到文件的类型至关重要
下文笔者讲述获取一个文本文件的格式信息的方法分享，如下所示:
现思路:
例:
package com.java265.other;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
public class Test {
/*
* java265.com 获取文本文件的编码方式
*
**/
public static void main(String[] args) {
File file = new File("E://person/java265.com/java.txt");
System.out.println(GetEncoding(file));
}
public static String GetEncoding(File file)
{
String charset = "GBK";
byte[] first3Bytes = new byte[3];
try {
boolean checked = false;
InputStream is = new FileInputStream(file);
int read = is.read(first3Bytes, 0, 3);
if (read == -1)
return charset;
if (first3Bytes[0] == (byte) 0xFF && first3Bytes[1] == (byte) 0xFE) {
charset = "UTF-16LE";
checked = true;
} else if (first3Bytes[0] == (byte) 0xFE
&& first3Bytes[1] == (byte) 0xFF) {
charset = "UTF-16BE";
checked = true;
} else if (first3Bytes[0] == (byte) 0xEF
&& first3Bytes[1] == (byte) 0xBB
&& first3Bytes[2] == (byte) 0xBF) {
charset = "UTF-8";
checked = true;
}else if (first3Bytes[0] == (byte) 0xA
&& first3Bytes[1] == (byte) 0x5B
&& first3Bytes[2] == (byte) 0x30) {
charset = "UTF-8";
checked = true;
}else if (first3Bytes[0] == (byte) 0xD
&& first3Bytes[1] == (byte) 0xA
&& first3Bytes[2] == (byte) 0x5B) {
charset = "GBK";
checked = true;
}else if (first3Bytes[0] == (byte) 0x5B
&& first3Bytes[1] == (byte) 0x54
&& first3Bytes[2] == (byte) 0x49) {
charset = "windows-1251";
checked = true;
}
//bis.reset();
InputStream istmp = new FileInputStream(file);
if (!checked) {
int loc = 0;
while ((read = istmp.read()) != -1) {
loc++;
if (read >= 0xF0)
break;
if (0x80 <= read && read <= 0xBF)
break;
if (0xC0 <= read && read <= 0xDF) {
read = istmp.read();
if (0x80 <= read && read <= 0xBF)
continue;
else
break;
} else if (0xE0 <= read && read <= 0xEF) {
read = istmp.read();
if (0x80 <= read && read <= 0xBF) {
read = istmp.read();
if (0x80 <= read && read <= 0xBF) {
charset = "UTF-8";
break;
} else
break;
} else
break;
}
}
}
is.close();
istmp.close();
} catch (Exception e) {
e.printStackTrace();
}
return charset;
}
}
