Java中加密工具类

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package com.hyphen.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* @ClassName: test1
* @Description: TODO(这里用一句话描述这个类的作用)
* @author wusong
* @date 2014-9-2 下午12:56:11
*
*/
public class EncryptUtil {

   public static void main(String[] args) {
       //md5加密测试
       String md5_1 = md5("123");
       String md5_2 = md5("abc");
       System.out.println(md5_1 + "\n" + md5_2);
       System.out.println("md5 length: " + md5_1.length());
       //sha加密测试
       String sha_1 = sha("123");
       String sha_2 = sha("abc");
       System.out.println(sha_1 + "\n" + sha_2);
       System.out.println("sha length: " + sha_1.length());
   }

   // md5加密
   public static String md5(String inputText) {
       return encrypt(inputText, "md5");
   }

   // sha加密
   public static String sha(String inputText) {
       return encrypt(inputText, "sha-1");
   }

   /**
   * md5或者sha-1加密
   *
   * @param inputText
   *            要加密的内容
   * @param algorithmName
   *            加密算法名称：md5或者sha-1，不区分大小写
   * @return
   */
   private static String encrypt(String inputText, String algorithmName) {
       if (inputText == null || "".equals(inputText.trim())) {
           throw new IllegalArgumentException("请输入要加密的内容");
       }
       if (algorithmName == null || "".equals(algorithmName.trim())) {
           algorithmName = "md5";
       }
       String encryptText = null;
       try {
           MessageDigest m = MessageDigest.getInstance(algorithmName);
           m.update(inputText.getBytes("UTF8"));
           byte s[] = m.digest();
           // m.digest(inputText.getBytes("UTF8"));
           return hex(s);
       } catch (NoSuchAlgorithmException e) {
           e.printStackTrace();
       } catch (UnsupportedEncodingException e) {
           e.printStackTrace();
       }
       return encryptText;
   }

   // 返回十六进制字符串
   private static String hex(byte[] arr) {
       StringBuffer sb = new StringBuffer();
       for (int i = 0; i < arr.length; ++i) {
           sb.append(Integer.toHexString((arr[i] & 0xFF) | 0x100).substring(1,
                   3));
       }
       return sb.toString();
   }
}

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