java实现对字符串进行MD5加密

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Util {
	 public static String md5(String plainText) {
		 byte[] secretBytes = null;
		 try {
			 //获取明文字节数组
			 secretBytes = MessageDigest.getInstance("md5").digest(plainText.getBytes());
		 }
		 catch(NoSuchAlgorithmException e) {
			 throw new RuntimeException("No Such Algorithm.");
		 }
		 String md5code = new BigInteger(1,secretBytes).toString(16);
		 for(int i=0;i < 32 - md5code.length();i ++) {
			 md5code = "0" + md5code;
		 }
		 return md5code;
	 }
	 public static void main(String[] args) {
		String password = "123456";
		String code = MD5Util.md5(password);
		System.out.println(code);
	}
}