java比较文件相同MD5

public class MD5Filter {
     
     public static String getMd5ByFile(File file) {
         String value = null ;
     try {
         FileInputStream in = new FileInputStream(file);
         MappedByteBuffer byteBuffer = in.getChannel().map(FileChannel.MapMode.READ_ONLY, 0 , file.length());
         MessageDigest md5 = MessageDigest.getInstance( "MD5" );
         md5.update(byteBuffer);
         BigInteger bi = new BigInteger( 1 , md5.digest());
         value = bi.toString( 16 );
     } catch (Exception e) {
         e.printStackTrace();
     } finally {
             if ( null != in) {
                 try {
                 in.close();
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }
     }
     return value;
     }
 
     public static void main(String[] args) {
         String v = MD5Filter.getMd5ByFile( new File( "C:\\Users\\Administrator\\Desktop\\index.txt" ));
     System.out.println(v.toUpperCase());
     }
｝
版权声明：本文为zhuixunhebe1原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接和本声明。