java获取文本编码
java未来王者 人气:0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 { /* * 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; } }
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