一个利用byte2hexString的简单MD5的应用，把你的密码加密

				import java.security.MessageDigest;

public static String MD5Encode(String sourceString) {  
   String resultString = null;  
   try{  
      resultString=new String(sourceString);  
      MessageDigest md = MessageDigest.getInstance("MD5");  
      resultString=byte2hexString(md.digest(resultString.getBytes()));  
   }catch (Exception ex) {  
   }  
   return resultString;  
}  
 
public staticfinal String byte2hexString(byte[] bytes) {
   StringBuffer buf = new StringBuffer(bytes.length * 2);
   for (int i = 0; i < bytes.length; i++) {
      if ( ((int) bytes[i] & 0xff) < 0x10) {
         buf.append("0");
      }
      buf.append(Long.toString((int) bytes[i] & 0xff, 16));
   }
   return buf.toString();
}

public staticvoid main(String[] args) throws Exception {
   System.out.println(MD5Encode("abc"));  
   System.out.println(MD5Encode("hello"));  
   System.out.println(MD5Encode("123456"));  
   System.out.println(MD5Encode("你好Blog"));
}

结果：

900150983cd24fb0d6963f7d28e17f72
5d41402abc4b2a76b9719d911017c592
e10adc3949ba59abbe56e057f20f883e
2fc0228c7266d61d184dcf2a6b3b81d3