import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Set; import cpdetector.io.CodepageDetectorProxy; import cpdetector.io.HTMLCodepageDetector; import cpdetector.io.JChardetFacade; public class PageEncodeDetector {   private static CodepageDetectorProxy detector = CodepageDetectorProxy       .getInstance();   static {     detector.add(new HTMLCodepageDetector(false));     detector.add(JChardetFacade.getInstance());   }   /**     * 测试用例     *        * @param args     */   public static void main(String[] args) {     PageEncodeDetector web = new PageEncodeDetector();     try {       System.out.println(web.getCharset("http://www.baidu.com/"));     } catch (IOException e) {       // TODO Auto-generated catch block       e.printStackTrace();     }   }   /**     * @param strurl     *                        页面url地址,需要以 http://开始，例：http://www.pujia.com     * @return     * @throws IOException     */   public String getCharset(String strurl) throws IOException {     // 定义URL对象     URL url = new URL(strurl);     // 获取http连接对象     HttpURLConnection urlConnection = (HttpURLConnection) url         .openConnection();     ;     urlConnection.connect();     // 网页编码     String strencoding = null;     /**      * 首先根据header信息，判断页面编码      */     // map存放的是header信息(url页面的头信息)     Map<String, List<String>> map = urlConnection.getHeaderFields();     Set<String> keys = map.keySet();     Iterator<String> iterator = keys.iterator();     // 遍历,查找字符编码     String key = null;     String tmp = null;     while (iterator.hasNext()) {       key = iterator.next();       tmp = map.get(key).toString().toLowerCase();       // 获取content-type charset       if (key != null && key.equals("Content-Type")) {         int m = tmp.indexOf("charset=");         if (m != -1) {           strencoding = tmp.substring(m + 8).replace("]", "");           return strencoding;         }       }     }     /**      * 通过解析meta得到网页编码      */     // 获取网页源码(英文字符和数字不会乱码，所以可以得到正确<meta/>区域)     StringBuffer sb = new StringBuffer();     String line;     try {       BufferedReader in = new BufferedReader(new InputStreamReader(url           .openStream()));       while ((line = in.readLine()) != null) {         sb.append(line);       }       in.close();     } catch (Exception e) { // Report any errors that arise       System.err.println(e);       System.err           .println("Usage:     java     HttpClient     <URL>     [<filename>]");     }     String htmlcode = sb.toString();     // 解析html源码，取出<meta />区域，并取出charset     String strbegin = "<meta";     String strend = ">";     String strtmp;     int begin = htmlcode.indexOf(strbegin);     int end = -1;     int inttmp;     while (begin > -1) {       end = htmlcode.substring(begin).indexOf(strend);       if (begin > -1 && end > -1) {         strtmp = htmlcode.substring(begin, begin + end).toLowerCase();         inttmp = strtmp.indexOf("charset");         if (inttmp > -1) {           strencoding = strtmp.substring(inttmp + 7, end).replace(               "=", "").replace("/", "").replace("\"", "")               .replace("\‘", "").replace(" ", "");           return strencoding;         }       }       htmlcode = htmlcode.substring(begin);       begin = htmlcode.indexOf(strbegin);     }     /**      * 分析字节得到网页编码      */     strencoding = getFileEncoding(url);     // 设置默认网页字符编码     if (strencoding == null) {       strencoding = "GBK";     }     return strencoding;   }   /**     *        *<br>     * 方法说明：通过网页内容识别网页编码     *        *<br>     * 输入参数：strUrl 网页链接; timeout 超时设置     *        *<br>     * 返回类型：网页编码     */   public static String getFileEncoding(URL url) {     java.nio.charset.Charset charset = null;     try {       charset = detector.detectCodepage(url);     } catch (Exception e) {       System.out.println(e.getClass() + "分析" + "编码失败");     }     if (charset != null)       return charset.name();     return null;   } }