Java 获得文件编码格式<转>

Java判断文件编码集

/**                                                                              
* 获得远程URL文件的编码格式                                                     
*/                                                                              
public static String getReomoteURLFileEncode(URL url) {                          
   CodepageDetectorProxy detector = CodepageDetectorProxy.getInstance();          
   detector.add(new ParsingDetector(false));                                      
   detector.add(JChardetFacade.getInstance());                                    
   detector.add(ASCIIDetector.getInstance());                                     
   detector.add(UnicodeDetector.getInstance());                                   
   java.nio.charset.Charset charset = null;                                       
   try {                                                                          
    System.out.println(url);                                                     
    charset = detector.detectCodepage(url);                                      
   } catch (Exception ex) {                                                       
    ex.printStackTrace();                                                        
   }                                                                              
   if (charset != null) {                                                         
    return charset.name();                                                       
   } else {                                                                       
    return "utf-8";                                                              
   }                                                                              
}                                                                                
                                                                                  
                                                                                  
/**                                                                              
* 获得文件流的编码格式                                                          
*/                                                                              
public static String getInputStreamEncode(InputStream is) {                      
   CodepageDetectorProxy detector = CodepageDetectorProxy.getInstance();          
   detector.add(new ParsingDetector(false));                                      
   detector.add(JChardetFacade.getInstance());                                    
   detector.add(ASCIIDetector.getInstance());                                     
   detector.add(UnicodeDetector.getInstance());                                   
   java.nio.charset.Charset charset = null;                                       
   try {                                                                          
    charset = detector.detectCodepage(is, 0);                                    
   } catch (Exception ex) {                                                       
    ex.printStackTrace();                                                        
   }                                                                              
   if (charset != null) {                                                         
    return charset.name();                                                       
   } else {                                                                       
    return "utf-8";                                                              
   }                                                                              
}                                                                                
                                                                                  
/**                                                                              
* 获得本地文件的编码格式                                                        
*/                                                                              
public static String getLocalteFileEncode(String filePath) {                     
   CodepageDetectorProxy detector = CodepageDetectorProxy.getInstance();          
   detector.add(new ParsingDetector(false));                                      
   detector.add(JChardetFacade.getInstance());                                    
   detector.add(ASCIIDetector.getInstance());                                     
   detector.add(UnicodeDetector.getInstance());                                   
   java.nio.charset.Charset charset = null;                                       
   File file = new File(filePath);                                                
   try {                                                                          
    charset = detector.detectCodepage(file.toURI().toURL());                     
   } catch (Exception ex) {                                                       
    ex.printStackTrace();                                                        
   }                                                                              
   if (charset != null) {                                                         
    return charset.name();                                                       
   } else {                                                                       
    return "utf-8";                                                              
   }                                                                              
}                                                                                
/**                                                                              
* 获得字符串的编码格式                                                          
*/                                                                              
public static String getStringEncode(String str) {                               
   CodepageDetectorProxy detector = CodepageDetectorProxy.getInstance();          
   detector.add(new ParsingDetector(false));                                      
   detector.add(JChardetFacade.getInstance());                                    
   detector.add(ASCIIDetector.getInstance());                                     
   detector.add(UnicodeDetector.getInstance());                                   
   java.nio.charset.Charset charset = null;                                       
   InputStream myIn=new ByteArrayInputStream(str.getBytes());                     
   try {                                                                          
    charset = detector.detectCodepage(myIn,3);                                   
   } catch (Exception ex) {                                                       
    ex.printStackTrace();                                                        
   }                                                                              
   if (charset != null) {                                                         
    return charset.name();                                                       
   } else {                                                                       
    return "utf-8";                                                              
   }                                                                              
}