base64加盐算法

package com.rd.p2p.common.util;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;

import com.rd.p2p.common.util.code.BASE64Decoder;
import com.rd.p2p.common.util.code.BASE64Encoder;

/**
* base64加盐算法
*
*/
public class SaltUtil {

   /**
   * 字符串Base64位加密
   * @param str
   * @return
   */
   public static Map<String, Object> base64Encode(String string) {
       Map<String, Object> data = new HashMap<String, Object>();
       // 生成6位随机数
       String salt = getSalt();
       // 重新封装
       String str = string + salt;
       // base64加密
       BASE64Encoder encoder = new BASE64Encoder();
       String result = encoder.encode(str.getBytes());
       data.put("result", result);
       data.put("salt", salt);
       return data;
   }

   /**
   * 字符串Base64位解密
   * @param str
   * @return
   * @throws IOException
   */
   public static String base64Decode(String str, String salt) {
       try {
           if (StringUtil.isNotBlank(str)) {
               BASE64Decoder decoder = new BASE64Decoder();
               String string = decoder.decodeStr(str);
               String result = string.replaceAll(salt, "");
               return result;
           } else {
               return null;
           }
       } catch (IOException e) {
           e.printStackTrace();
       }
       return "";
   }

   private static String getSalt() {
       String[] ValidStr={"0","1","2","3","4","5","6","7","8","9",
           "a","b","c","d","e","f","g","h","i","j","k","l","m","n","p","q","r","s","t","u","v","w","x","y","z"};
       int number=ValidStr.length;
       String salt = "";
       Random random = new Random();
       for (int i = 0; i < 6; i++) {
           String rand = String.valueOf(ValidStr[random.nextInt(number)]);
           salt += rand;
       }
       return salt;
   }
}
这里采用随机6位字符串+需要加密的字符串生成一条新的字符串，然后对该字符串进行base64加密（加密工具类可以参考我写的关于base64的工具类），将加密后的字符串和salt存到数据库中，需要时再进行解密操作。如果是密码等可以采用MD5进行加密，防止数据库密码泄漏。

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