1.MD5

package com.ninemax.utils.tools;import java.math.BigInteger;import java.security.MessageDigest;/** * Created by AckMan on 2016/9/6. * * 源数据MD5加密比较,不可解密 * * MD5是一种不可逆的摘要算法 */public class MD5Utils {    public static String md5Encode(String str){        byte [] result = null;        if(str.isEmpty()){            return  null;        }        try {            System.out.println("加密前:" + str);            result = MessageDigest.getInstance("md5").digest(str.getBytes("utf-8"));            System.out.println("加密后:" + new BigInteger(1, result).toString(16));        } catch (Exception e) {            e.printStackTrace();        }        return new BigInteger(1, result).toString(16);    }    public static void main(String args[]){       md5Encode("darker");    }}

MD5运行结果

加密前:darker加密后:ea225ae75583177eba676db77e3af75d

2.Base64

package com.ninemax.utils.tools;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;import java.io.IOException;import java.io.UnsupportedEncodingException;/** * Created by AckMan on 2016/9/6. * * Base64是一种编码方式 */public class Base64Utils {    public static String encode(String str){        if(str.isEmpty()){            return  null;        }        BASE64Encoder encoder = new BASE64Encoder();        try {            System.out.println("加密前:" + str);            String result =  encoder.encode(str.getBytes("utf-8"));            System.out.println("加密后:" + result);            return encoder.encode(str.getBytes("utf-8"));        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        }        return null;    }    public static String decode(String str){        if(str.isEmpty()){            return null;        }        BASE64Decoder decoder = new BASE64Decoder();        try {            System.out.println("解密前:" + str);            byte[] result =   decoder.decodeBuffer(str);            System.out.println("解密后:" + new String(result));        } catch (IOException e) {            e.printStackTrace();        }        return null;    }    public static void main(String args[]){        //encode("darker");        decode(encode("darker"));    }}

Base64运行结果

加密前:darker加密后:ZGFya2Vy解密前:ZGFya2Vy解密后:darker