MD5加密算法（java代码）

package hdty.project.test.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class EncoderByMd5 {

public static String encodeByMd5(String plainText) {
StringBuffer buf = new StringBuffer("");
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(plainText.getBytes());
byte b[] = md.digest();
int i = 0;
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(); //32位的加密
//return buf.toString().substring(8,24); // 16位的加密
}

public static void main(String[] args) throws NoSuchAlgorithmException,
UnsupportedEncodingException {
System.out.println(Md5("6"));

}
}