Base64算法定義?

Base64是一種基于64個字符的編碼算法，以任意8位字節序列組合的描述形式，這種形式不易直接識別。經Base64編碼后的字符串的字符數是以4為單位的整數倍?

Base64密鑰?

Base64編程使用?

package com.cry.base64;import java.io.IOException;import Decoder.BASE64Decoder; import Decoder.BASE64Encoder;public class Base64Util {/*** base64加密* @param data* @return*/public static String encryptBase64(byte[] data) {return new BASE64Encoder().encode(data);}/*** base64解密* @param data* @return* @throws IOException*/public static String decryptBase64(String data) throws IOException {byte[] resultBytes = new BASE64Decoder().decodeBuffer(data);return new String(resultBytes);}public static void main(String args[]) throws IOException {String data = "測試base64";String encodeData = Base64Util.encryptBase64(data.getBytes());System.out.println("加密后>>>" + encodeData);System.out.println("解密后>>" + Base64Util.decryptBase64(encodeData));;}}

Base64算法的實際應用

base64早期用于郵件傳輸，用于解決亂碼問題。

可以通過telnet 進行郵件傳輸，首先開啟telnet服務，然后以管理員形式打開cmd然后輸入：telnet smtp.163.com 25 然后回車進入以下界面：

輸入HELO 回車，然后輸入AUTH LOGIN回車，輸入用戶名(base64)回車，輸入密碼（base64）回車提示成功；

輸入MAIL FROM:<xxx1@163.com> 回車

輸入RCPT TO:<xxx2@163.com>回車

輸入DATA

輸入subject : xxxxx

from:xxx1@163.com

to:xxx2@163.com

…..

如圖：

java編碼實現

package com.cry.base64; import java.io.BufferedReader; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.PrintWriter; import java.net.Socket;public class SMTPMain {public static void main(String[] args) {// 用戶名密碼String sender = "xxx1@163.com";String receiver = "xxx2@163.com";String password = "password";// 將用戶名和密碼進行Base64編碼String userBase64 = Base64Util.encryptBase64(sender.substring(0,sender.indexOf("@")).getBytes());String passBase64 = Base64Util.encryptBase64(password.getBytes());try {Socket socket = new Socket("smtp.163.com", 25);InputStream inputStream = socket.getInputStream();OutputStream outputStream = socket.getOutputStream();BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));PrintWriter writter = new PrintWriter(outputStream, true); System.out.println(reader.readLine());// writter.println("test base64");System.out.println(reader.readLine());// AUTH LOGIN >>>Base64writter.println("AUTH LOGIN");System.out.println(reader.readLine());writter.println(userBase64);System.out.println(reader.readLine());writter.println(passBase64);System.out.println(reader.readLine());// 設置 "MAIL FROM" 和 "RCPT TO"writter.println("MAIL FROM:<" + sender + ">");System.out.println(reader.readLine());writter.println("RCPT TO:<" + receiver + ">");System.out.println(reader.readLine());// 設置 "DATA"writter.println("DATA");System.out.println(reader.readLine());writter.println("SUBJECT:hello test");writter.println("FROM:" + sender);writter.println("TO:" + receiver);writter.println("Content-Type: text/plain;charset=\"gb2312\"");writter.println();writter.println("hello world!");writter.println(".");writter.println("");System.out.println(reader.readLine());// over 斷開connectwritter.println("RSET");System.out.println(reader.readLine());writter.println("QUIT");System.out.println(reader.readLine());} catch (Exception e) {e.printStackTrace();}} }

總結

以上是生活随笔為你收集整理的Base64算法的编程使用的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。