encrypter.java

java实现的可配置的工作流引擎,采用jsp+javabean实现

package com.hongsoft.res.util;

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

public class Encrypter {

  public static final String encodeHex(byte[] bytes) {
    StringBuffer buf = new StringBuffer(bytes.length * 2);
    int i;

    for (i = 0; i < bytes.length; i++) {
      if ( ( (int) bytes[i] & 0xff) < 0x10) {
        buf.append("0");
      }
      buf.append(Long.toString( (int) bytes[i] & 0xff, 16));
    }
    return buf.toString();
  }
  /**
   * MD5加密方法
   * @param data 需要加密的数据
   * @return 加密后的数据
   */
  public synchronized static final String hashByMD5(String data) {
    try {
      MessageDigest digest = MessageDigest.getInstance("MD5");
      // Now, compute hash.
      digest.update(data.getBytes());
      return encodeHex(digest.digest());
    }
    catch (NoSuchAlgorithmException nsae) {
      System.err.println("Failed to load the MD5 MessageDigest. " +
                         "will be unable to function normally.");
      nsae.printStackTrace();
      return null;
    }
  }
}