Base64的Java实现

一 算法实现

1、JDK

2、Commonc Codec

3、Bouncy Castle

 

二 代码

package com.imooc.security.base64;

import java.io.IOException;

import org.apache.commons.codec.binary.Base64;

import sun.misc.BASE64Decoder;

import sun.misc.BASE64Encoder;

 

public class ImoocBase64 {

 

private static String src = "cakin24 security base64";

 

public static void main(String[] args) {

jdkBase64();

commonsCodesBase64();

bouncyCastleBase64();

}

 

public static void jdkBase64() {

try {

BASE64Encoder encoder = new BASE64Encoder();

String encode = encoder.encode(src.getBytes());

System.out.println("encode : " + encode);

 

BASE64Decoder decoder = new BASE64Decoder();

System.out.println("decode : " + new String(decoder.decodeBuffer(encode)));

} catch (IOException e) {

e.printStackTrace();

}

}

 

public static void commonsCodesBase64() {

byte[] encodeBytes = Base64.encodeBase64(src.getBytes());

System.out.println("encode : " + new String(encodeBytes));

 

byte[] decodeBytes = Base64.decodeBase64(encodeBytes);

System.out.println("decode : " + new String(decodeBytes));

}

 

public static void bouncyCastleBase64() {

byte[] encodeBytes = org.bouncycastle.util.encoders.Base64.encode(src.getBytes());

System.out.println("encode : " + new String(encodeBytes));

 

byte[] decodeBytes = org.bouncycastle.util.encoders.Base64.decode(encodeBytes);

System.out.println("decode : " + new String(decodeBytes));

}

}

 

三 运行效果

encode : Y2FraW4yNCBzZWN1cml0eSBiYXNlNjQ=

decode : cakin24 security base64

encode : Y2FraW4yNCBzZWN1cml0eSBiYXNlNjQ=

decode : cakin24 security base64

encode : Y2FraW4yNCBzZWN1cml0eSBiYXNlNjQ=

decode : cakin24 security base64

 

四 应用场景

email、秘钥、证书文件

 

五 产生原因

邮件的历史问题

 

六 其他

基于64个字符的编码算法，定义于RFC 2045