一個利用byte2hexString的簡單MD5的應用，把你的密碼加密

				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"));
}

結果：

900150983cd24fb0d6963f7d28e17f72
5d41402abc4b2a76b9719d911017c592
e10adc3949ba59abbe56e057f20f883e
2fc0228c7266d61d184dcf2a6b3b81d3