使用 jchardet 获得文件编码 -javacode

转载自：http://hi.baidu.com/hxzon/blog/item/f2b8b51bfa5101108618bfd1.html

//使用 jchardet 获得文件编码 -javacode //当含中文的文件用ANSI编码保存时，检测还是出错。 package org.mozilla.intl.chardet; import java.io.BufferedInputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.util.ArrayList; import java.util.List; /** * 借助JCharDet获取文件字符集 * * @author icer PS: JCharDet 是mozilla自动字符集探测算法代码的java移植，其官方主页为： * http://jchardet.sourceforge.net/ * @date 2008/11/13 */ public class FileCharsetDetector { private boolean found = false; /** * 如果完全匹配某个字符集检测算法, 则该属性保存该字符集的名称. 否则(如二进制文件)其值就为默认值 null, 这时应当查询属性 */ private String encoding = null; // public static void main(String[] argv) throws Exception { // if (argv.length != 1 && argv.length != 2) { // // System.out.println("Usage: FileCharsetDetector <path> [<languageHint>]"); // // System.out.println(""); // System.out.println("Where <path> is d:/demo.txt"); // System.out.println("For optional <languageHint>. Use following..."); // System.out.println(" 1 => Japanese"); // System.out.println(" 2 => Chinese"); // System.out.println(" 3 => Simplified Chinese"); // System.out.println(" 4 => Traditional Chinese"); // System.out.println(" 5 => Korean"); // System.out.println(" 6 => Dont know (default)"); // // return; // } else { // String encoding = null; // if (argv.length == 2) { // encoding = new FileCharsetDetector().guestFileEncoding(argv[0], Integer.valueOf(argv[1])); // } else { // encoding = new FileCharsetDetector().guestFileEncoding(argv[0]); // } // System.out.println("文件编码:" + encoding); // } // } /** added by bruce Yang on 2012.04.16.00.44~ */ public static void main(String[] args) throws Exception { List<String> pathList = new ArrayList<String>(); pathList.add("/Users/user/Novels/txt/猎头.txt"); pathList.add("/Users/user/Novels/txt/2哥小说集合/邪神传说5.txt.txt"); pathList.add("/Users/user/Novels/txt/2哥小说集合/福尔摩斯侦探小说全集（中）.txt"); pathList.add("/Users/user/Novels/txt/2哥小说集合/长生界0.txt.txt"); pathList.add("/Users/user/Downloads/开源框架/cocos2d-x/cocos2d-1.0.1-x-0.11.0/licenses/LICENSE_artwork.txt"); for(String path : pathList) { String encoding = new FileCharsetDetector().guestFileEncoding(path); System.out.println("文件编码:" + encoding); } } /** * 传入一个文件(File)对象，检查文件编码 * * @param file * File对象实例 * @return 文件编码，若无，则返回null * @throws FileNotFoundException * @throws IOException */ public String guestFileEncoding(File file) throws FileNotFoundException, IOException { return guestFileEncoding(file, new nsDetector()); } /** * 获取文件的编码 * * @param file * File对象实例 * @param languageHint * 语言提示区域代码 eg：1 : Japanese; 2 : Chinese; 3 : Simplified Chinese; * 4 : Traditional Chinese; 5 : Korean; 6 : Dont know (default) * @return 文件编码，eg：UTF-8,GBK,GB2312形式，若无，则返回null * @throws FileNotFoundException * @throws IOException */ public String guestFileEncoding(File file, int languageHint) throws FileNotFoundException, IOException { return guestFileEncoding(file, new nsDetector(languageHint)); } /** * 获取文件的编码 * * @param path * 文件路径 * @return 文件编码，eg：UTF-8,GBK,GB2312形式，若无，则返回null * @throws FileNotFoundException * @throws IOException */ public String guestFileEncoding(String path) throws FileNotFoundException, IOException { return guestFileEncoding(new File(path)); } /** * 获取文件的编码 * * @param path * 文件路径 * @param languageHint * 语言提示区域代码 eg：1 : Japanese; 2 : Chinese; 3 : Simplified Chinese; * 4 : Traditional Chinese; 5 : Korean; 6 : Dont know (default) * @return * @throws FileNotFoundException * @throws IOException */ public String guestFileEncoding(String path, int languageHint) throws FileNotFoundException, IOException { return guestFileEncoding(new File(path), languageHint); } /** * 获取文件的编码 * * @param file * @param det * @return * @throws FileNotFoundException * @throws IOException */ private String guestFileEncoding(File file, nsDetector det) throws FileNotFoundException, IOException { // Set an observer... // The Notify() will be called when a matching charset is found. det.Init(new nsICharsetDetectionObserver() { public void Notify(String charset) { found = true; encoding = charset; } }); BufferedInputStream imp = new BufferedInputStream(new FileInputStream( file)); byte[] buf = new byte[1024]; int len; boolean done = false; boolean isAscii = true; while ((len = imp.read(buf, 0, buf.length)) != -1) { // Check if the stream is only ascii. if (isAscii) isAscii = det.isAscii(buf, len); // DoIt if non-ascii and not done yet. if (!isAscii && !done) done = det.DoIt(buf, len, false); } det.DataEnd(); if (isAscii) { encoding = "ASCII"; found = true; } if (!found) { String prob[] = det.getProbableCharsets(); if (prob.length > 0) { // 在没有发现情况下，则取第一个可能的编码 encoding = prob[0]; } else { return null; } } return encoding; } }