package org.shefron.utils;import java.io.BufferedInputStream;import java.io.FileInputStream;import java.net.URL;import java.util.Arrays;import org.mozilla.intl.chardet.nsDetector;import org.mozilla.intl.chardet.nsICharsetDetectionObserver;import org.mozilla.intl.chardet.nsPSMDetector;public final class FileCharsetDetector {	/**	 *	 * @param filePath the local filepath	 * @param langFlag	 *            nsPSMDetector.CHINESE,	 *            nsPSMDetector.SIMPLIFIED_CHINESE,	 *            nsPSMDetector.TRADITIONAL_CHINESE,	 *            nsPSMDetector.ALL ...	 * @return	 * @throws Exception	 */	public final static CharsetObj getPriorityCharset(String filePath, int langFlag) throws Exception {		if(langFlag <1 || langFlag>6){			langFlag = nsPSMDetector.ALL;		}		final CharsetObj charsetObj = new CharsetObj();		FileInputStream fis = null;		try {			fis = new FileInputStream(filePath);			nsDetector det = new nsDetector(langFlag);			// Set an observer...			// The Notify() will be called when a matching charset is found.			det.Init(new nsICharsetDetectionObserver() {				public void Notify(String charset) {					charsetObj.setFound(true);					charsetObj.setCharset(charset);				}			});			BufferedInputStream imp = new BufferedInputStream(fis);			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) {				charsetObj.setAscii(true);			}			charsetObj.setProbableCharsets(det.getProbableCharsets());		} catch (Exception e) {			System.out.println("File handler Error!");			throw new Exception("File handler Error:"+e.getMessage());		}		return charsetObj;	}	/**	 *	 * @param filePath the local filepath	 * @return	 * @throws Exception	 */	public final static CharsetObj getPriorityCharset(String filePath) throws Exception{		return getPriorityCharset(filePath, nsPSMDetector.ALL);	}	/**	 *	 * @param url the www url	 * @return	 * @throws Exception	 */	public final static CharsetObj getPriorityCharset(URL url) throws Exception{		return getPriorityCharset(url, nsPSMDetector.ALL);	}	/**	 *	 * @param url the www url	 * @param langFlag	 * @return	 * @throws Exception	 */	public static CharsetObj getPriorityCharset(URL url, int langFlag) throws Exception {		if(langFlag <1 || langFlag>6){			langFlag = nsPSMDetector.ALL;		}		final CharsetObj charsetObj = new CharsetObj();		try {			nsDetector det = new nsDetector(langFlag);			// Set an observer...			// The Notify() will be called when a matching charset is found.			det.Init(new nsICharsetDetectionObserver() {				public void Notify(String charset) {					charsetObj.setFound(true);					charsetObj.setCharset(charset);				}			});			BufferedInputStream imp = new BufferedInputStream(url.openStream());			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) {				charsetObj.setAscii(true);			}			charsetObj.setProbableCharsets(det.getProbableCharsets());		} catch (Exception e) {			System.out.println("File handler Error!");			throw new Exception("File handler Error:"+e.getMessage());		}		return charsetObj;	}	public final static class CharsetObj {		private boolean found = false;		private String[] probableCharsets = null;		private String charset = null;		public String getCharset() {			return charset;		}		@Override		public String toString() {			return "CharsetObj [charset=" + this.getCharset() + ", found=" + this.isFound()					+ ", isAscii=" + this.isAscii() + ", probableCharsets="					+ Arrays.toString(this.getProbableCharsets()) + "]";		}		public void setCharset(String charset) {			this.charset = charset;		}		private boolean isAscii = true;		public boolean isFound() {			return found;		}		public String[] getProbableCharsets() {			return probableCharsets;		}		public boolean isAscii() {			return isAscii;		}		public void setFound(boolean found) {			this.found = found;		}		public void setProbableCharsets(String[] probableCharsets) {			this.probableCharsets = probableCharsets;		}		public void setAscii(boolean isAscii) {			this.isAscii = isAscii;		}	}}

使用jchardet1.1 判断文件或网页编码