java中生成MD5值

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

public class Md5Utils {

    /**
     * 使用md5的算法进行加密
     */
    public static String md5(String plainText){
        
        byte[] secretBytes = null;
        
        try {
            secretBytes = MessageDigest.getInstance("md5").digest(plainText.getBytes());
            
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException("没有md5这个算法！");
        }
        
        String md5code = new BigInteger(1, secretBytes).toString(16);//16进制数字
        // 如果生成数字未满32位，需要前面补0
        for (int i = 0; i < 32 - md5code.length(); i++) {
            md5code = "0" +md5code;
        }
        return md5code;
    }
    
    
    
}