需求：

某文件或者某字节流要检测他的编码格式。

实现：

基于jchardet

    	
     
      net.sourceforge.jchardet
     	
     
      jchardet
     	
     
      1.0
     
    

代码如下：

public class DetectorUtils {	private DetectorUtils() {	}	static class ChineseCharsetDetectionObserver implements			nsICharsetDetectionObserver {		private boolean found = false;		private String result;		public void Notify(String charset) {			found = true;			result = charset;		}		public ChineseCharsetDetectionObserver(boolean found, String result) {			super();			this.found = found;			this.result = result;		}		public boolean isFound() {			return found;		}		public String getResult() {			return result;		}	}	public static String[] detectChineseCharset(InputStream in)			throws Exception {		String[] prob=null;		BufferedInputStream imp = null;		try {			boolean found = false;			String result = Charsets.UTF_8.toString();			int lang = nsPSMDetector.CHINESE;			nsDetector det = new nsDetector(lang);			ChineseCharsetDetectionObserver detectionObserver = new ChineseCharsetDetectionObserver(					found, result);			det.Init(detectionObserver);			imp = new BufferedInputStream(in);			byte[] buf = new byte[1024];			int len;			boolean isAscii = true;			while ((len = imp.read(buf, 0, buf.length)) != -1) {				if (isAscii)					isAscii = det.isAscii(buf, len);				if (!isAscii) {					if (det.DoIt(buf, len, false))						break;				}			}			det.DataEnd();			boolean isFound = detectionObserver.isFound();			if (isAscii) {				isFound = true;				prob = new String[] { "ASCII" };			} else if (isFound) {				prob = new String[] { detectionObserver.getResult() };			} else {				prob = det.getProbableCharsets();			}			return prob;		} finally {			IOUtils.closeQuietly(imp);			IOUtils.closeQuietly(in);		}	}}

测试：

String file = "C:/3737001.xml";		String[] probableSet = DetectorUtils.detectChineseCharset(new FileInputStream(file));		for (String charset : probableSet) {			System.out.println(charset);		}

 依赖的jar参见附件