Java如何进行Base64的编码(Encode)与解码(Decode)?

时间:2023-01-10 18:10:35

Java如何进行Base64的编码(Encode)与解码(Decode)?

关于base64编码Encode和Decode编码的几种方式

Base64是一种能将任意Binary资料用64种字元组合成字串的方法,而这个Binary资料和字串资料彼此之间是可以互相转换的,十分方便。在实际应用上,Base64除了能将Binary资料可视化之外,也常用来表示字串加密过后的内容。如果要使用Java 程式语言来实作Base64的编码与解码功能,可以参考本篇文章的作法。

package edu;
import sun.misc.BASE64Encoder;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.io.UnsupportedEncodingException;
 
@SuppressWarnings("restriction")
public class Jiami {
    public static void main(String[] args) throws UnsupportedEncodingException {
        String userpwd= "jojo12525";
        MessageDigest sha1 = null;
        try {
            sha1 = MessageDigest.getInstance("SHA1");
        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        BASE64Encoder base64en = new BASE64Encoder();
        String pwd = base64en.encode(sha1.digest(userpwd.trim().getBytes("utf-8")));
        System.out.println(pwd);
    }
}

--------------------- 
作者:_calm 
来源:CSDN 
原文:https://blog.csdn.net/u011514810/article/details/72725398 
版权声明:本文为博主原创文章,转载请附上博文链接!

 

早期作法

早期在Java上做Base64的编码与解码,会使用到JDK里sun.misc套件下的BASE64Encoder和BASE64Decoder这两个类别,用法如下:

final BASE64Encoder encoder = new BASE64Encoder(); final BASE64Decoder decoder = new BASE64Decoder(); final String text = "字串文字"; final byte[] textByte = text.getBytes("UTF-8"); //编码 final String encodedText = encoder.encode(textByte); System.out.println(encodedText); //解码 System.out.println(new String(decoder.decodeBuffer(encodedText), "UTF-8")); final BASE64Encoder encoder = new BASE64Encoder(); final BASE64Decoder decoder = new BASE64Decoder(); final String text = "字串文字"; final byte[] textByte = text.getBytes("UTF-8"); //编码 final String encodedText = encoder.encode(textByte); System.out.println(encodedText); //解码 System.out.println(new String(decoder.decodeBuffer(encodedText), "UTF-8"));
  • 1
    final BASE64Encoder encoder = new BASE64Encoder();
    final BASE64Decoder decoder = new BASE64Decoder();
    final String text = "字串文字";
    final byte[] textByte = text.getBytes("UTF-8");
    //编码
    final String encodedText = encoder.encode(textByte);
    System.out.println(encodedText);
    //解码
    System.out.println(new String(decoder.decodeBuffer(encodedText), "UTF-8"));
    
    final BASE64Encoder encoder = new BASE64Encoder();
    final BASE64Decoder decoder = new BASE64Decoder();
    final String text = "字串文字";
    final byte[] textByte = text.getBytes("UTF-8");
    //编码
    final String encodedText = encoder.encode(textByte);
    System.out.println(encodedText);
    
    //解码
    System.out.println(new String(decoder.decodeBuffer(encodedText), "UTF-8"));

     

  • 从以上程式可以发现,在Java用Base64一点都不难,不用几行程式码就解决了!只是这个sun.mis c套件所提供的Base64功能,编码和解码的效率并不太好,而且在以后的Java版本可能就不被支援了,完全不建议使用。

Apache Commons Codec作法

Apache Commons Codec有提供Base64的编码与解码功能,会使用到org.apache.commons.codec.binary套件下的Base64类别,用法如下:

final Base64 base64 = new Base64(); final String text = "字串文字"; final byte[] textByte = text.getBytes("UTF-8"); //编码 final String encodedText = base64.encodeToString(textByte); System.out.println(encodedText); //解码 System.out.println(new String(base64.decode(encodedText), "UTF-8")); final Base64 base64 = new Base64(); final String text = "字串文字"; final byte[] textByte = text.getBytes("UTF-8"); //编码 final String encodedText = base64.encodeToString(textByte); System.out.println(encodedText); //解码 System.out.println(new String(base64.decode(encodedText), "UTF-8"));
final Base64 base64 = new Base64(); final String text = "字串文字"; final byte[] textByte = text.getBytes("UTF-8"); //编码 final String encodedText = base64.encodeToString(textByte); System.out.println(encodedText); //解码 System.out.println(new String(base64.decode(encodedText), "UTF-8")); final Base64 base64 = new Base64(); final String text = "字串文字"; final byte[] textByte = text.getBytes("UTF-8"); //编码 final String encodedText = base64.encodeToString(textByte); System.out.println(encodedText); //解码 System.out.println(new String(base64.decode(encodedText), "UTF-8"));

以上的程式码看起来又比早期用sun.mis c套件还要更精简,效能实际执行起来也快了不少。缺点是需要引用Apache Commons Codec,很麻烦。

Java 8之后的作法

Java 8的java.util套件中,新增了Base64的类别,可以用来处理Base64的编码与解码,用法如下:

final Base64.Decoder decoder = Base64.getDecoder(); final Base64.Encoder encoder = Base64.getEncoder(); final String text = "字串文字"; final byte[] textByte = text.getBytes("UTF-8"); //编码 final String encodedText = encoder.encodeToString(textByte); System.out.println(encodedText); //解码 System.out.println(new String(decoder.decode(encodedText), "UTF-8")); final Base64.Decoder decoder = Base64.getDecoder(); final Base64.Encoder encoder = Base64.getEncoder(); final String text = "字串文字"; final byte[] textByte = text.getBytes("UTF-8"); //编码 final String encodedText = encoder.encodeToString(textByte); System.out.println(encodedText); //解码 System.out.println(new String(decoder.decode(encodedText), "UTF-8"));
  • final Base64.Decoder decoder = Base64.getDecoder(); final Base64.Encoder encoder = Base64.getEncoder(); final String text = "字串文字"; final byte[] textByte = text.getBytes("UTF-8"); //编码 final String encodedText = encoder.encodeToString(textByte); System.out.println(encodedText); //解码 System.out.println(new String(decoder.decode(encodedText), "UTF-8")); final Base64.Decoder decoder = Base64.getDecoder(); final Base64.Encoder encoder = Base64.getEncoder(); final String text = "字串文字"; final byte[] textByte = text.getBytes("UTF-8"); //编码 final String encodedText = encoder.encodeToString(textByte); System.out.println(encodedText); //解码 System.out.println(new String(decoder.decode(encodedText), "UTF-8"));与sun.mis c套件和Apache Commons Codec所提供的Base64编解码器来比较的话,Java 8提供的Base64拥有更好的效能。实际测试编码与解码速度的话,Java 8提供的Base64,要比sun.mis c套件提供的还要快至少11倍,比Apache Commons Codec提供的还要快至少3倍。因此在Java上若要使用Base64,这个Java 8底下的java .util套件所提供的Base64类别绝对是首选!

 


package edu;import sun.misc.BASE64Encoder;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.io.UnsupportedEncodingException; @SuppressWarnings("restriction")public class Jiami {public static void main(String[] args) throws UnsupportedEncodingException {String userpwd= "jojo12525";MessageDigest sha1 = null;try {sha1 = MessageDigest.getInstance("SHA1");} catch (NoSuchAlgorithmException e) {// TODO Auto-generated catch blocke.printStackTrace();}BASE64Encoder base64en = new BASE64Encoder();String pwd = base64en.encode(sha1.digest(userpwd.trim().getBytes("utf-8")));System.out.println(pwd);}}
--------------------- 作者:_calm 来源:CSDN 原文:https://blog.csdn.net/u011514810/article/details/72725398 版权声明:本文为博主原创文章,转载请附上博文链接!