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:
- 通过获取文件流的前3个字节
- 判断其值的方式，即可获取文本文件的编码方式
例:
package com.java265.other;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
public class Test {
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;
}
}到此这篇关于java获取一个文本文件的编码(格式)信息的文章就介绍到这了,更多相关java获取文本编码内容请搜索编程网以前的文章或继续浏览下面的相关文章希望大家以后多多支持编程网！
