Vincent Yeh開發筆記: 【Java】Base64編碼與解碼

2018年10月10日星期三

【Java】Base64編碼與解碼

程式碼：

package ciphertest;

import com.sun.org.apache.xml.internal.security.exceptions.Base64DecodingException;
import com.sun.org.apache.xml.internal.security.utils.Base64;
import java.util.Scanner;

public class Base64_Test {

public static void main(String[] args) {
Scanner src = new Scanner(System.in);
while (true) {
System.out.print("mode:");
String mode = src.nextLine();
if (mode.equals("x")) {
System.exit(0);
}

System.out.print("input:");
String contain = src.nextLine();

if (mode.equals("e")) {
System.out.println(encode(contain));
} else if (mode.equals("d")) {
try {
System.out.println(decode(contain));
} catch (Base64DecodingException e) {
System.err.println(e.getMessage());
}
}

}
}

static String encode(String msg) {
byte[] bytes_str = msg.getBytes();
return Base64.encode(bytes_str);
}

static String decode(String msg) throws Base64DecodingException {
return new String(Base64.decode(msg));
}
}

執行

Console

mode:e
input:Hello!! I am Vincent Yeh.
SGVsbG8hISBJIGFtIFZpbmNlbnQgWWVoLg==
mode:d
input:SGVsbG8hISBJIGFtIFZpbmNlbnQgWWVoLg==
Hello!! I am Vincent Yeh. mode:x