Md5加密

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class md5 {
public static void main(String[] args) {
String pass="qaz123";
//调用Md5方法
System.out.println("32位加密result: " + Md5(pass));//32位的加密
System.out.println("16位加密result: " + Md5(pass).substring(8,24));//16位的加密
}
private static String Md5(String pass ) {
StringBuffer buf = new StringBuffer("");
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(pass.getBytes());
byte b[] = md.digest();
int i;
for (int offset = 0; offset < b.length; offset++) {
i= b[offset];
if(i<0) i+= 256;
if(i<16)
buf.append("0");
buf.append(Integer.toHexString(i));
}
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return buf.toString();
}
}