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;}}