Base64加密解密实现

加密代码

类名：Base64Encode

package cn.lfd.demo;
import java.util.Scanner;
public class Base64Encode {

	/**
	 * @param args
	 */
	final byte[] array = {'A','B','C','D','E','F','G','H','I','J',
			                'K','L','M','N','O','P','Q','R','S','T',
			                'U','V','W','X','Y','Z','a','b','c','d',
			                'e','f','g','h','i','j','k','l','m','n',
			                'o','p','q','r','s','t','u','v','w','x',
			                'y','z','0','1','2','3','4','5','6','7',
			                '8','9','+','/'};
	public String Encode(byte [] toEncode){
		byte [] text = toEncode;
		byte [] transit = new byte[3];
		byte [] result = new byte[4];
		byte c1 = 0;
		byte c2 = 0;
		byte d1 = 0;
		byte d2 = 0;	
		StringBuffer sb = new StringBuffer("");
		int len = text.length;
		int discuss = len/3;
		int remainder = len % 3;
		for(int i = 0; i < discuss; i++){
			transit[0] = text[3*i];
			transit[1] = text[3*i + 1];
			transit[2] = text[3*i + 2];
			result[0] = (byte)(transit[0] >> 2);
			c1 = (byte)((byte)(transit[0] << 4) & (byte)(0x30));
			c2 = (byte)((byte)(transit[1] >> 4) & (byte)(0x0f));
			result[1] = (byte)((byte)c1 | (byte)c2);
			d1 = (byte)((transit[1] << 2) & (byte)0x3c);
			d2 = (byte)((byte)(transit[2] >> 6) & (byte)0x03);
			result[2] = (byte) (d1 | d2);
			result[3] = (byte)((byte)(transit[2]) & (byte)(0x3f));
			for(int j =0;j< 4;j++){
				sb = sb.append((char)array[result[j]]);
			}	
		}
		if(remainder == 1){
			transit[0] = text[3*discuss];
			result[0] = (byte)(transit[0] >> 2);
			result[1] = (byte)((byte)(transit[0] << 4) & (byte)(0x30));
			sb = sb.append((char)array[result[0]]);
			sb = sb.append((char)array[result[1]]);
			sb = sb.append("==");
		}
		
		if(remainder == 2){
			transit[0] = text[3 * discuss];
			transit[1] = text[3 * discuss +1];
			result[0] = (byte)(transit[0] >> 2);
			c1 = (byte)((byte)(transit[0] << 4) & (byte)(0x30));
			c2 = (byte)((byte)(transit[1] >> 4) & (byte)(0x0f));
			result[1] = (byte)((byte)c1 | (byte)c2);
			result[2] = (byte)((byte)(transit[1] << 2) & (byte)(0x3c));
			for(int k = 0; k < 3;k++){
				sb = sb.append((char)array[result[k]]);
			}
			sb = sb.append("=");
		}
		
		String encodeData = new String(sb);
		return encodeData;
	}
	
	public boolean equals_byte(byte[] array1,byte [] array2,int length) {
		// TODO 自动生成方法存根
		int i;
		for(i = 0;i < length; i ++){
			if(array1[i] != array2[i])
				break;
		}
		if(i == length)
			return true;
		else
			return false;
	}

	public static void main(String[] args) {
		// TODO 自动生成方法存根
		int i;
		Base64Encode base64_encode = new Base64Encode();
		Base64Decode base64_decode = new Base64Decode();
		System.out.println("请输入要编码的字符:");
		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		byte [] testArray = str.getBytes();
		String result = base64_encode.Encode(testArray);
		byte result_byte[] = base64_decode.Decode(result);

		boolean bool = base64_encode.equals_byte(result_byte, testArray, testArray.length);
		if(bool == true){
			System.out.println("Base64编解码成功！");
		}
		else{
			System.out.println("Base64编解码失败！");
		}
		System.out.println(result);
		
		System.out.println("解码为:"+new String(result_byte ,0 ,result_byte.length));
	}

}
package cn.lfd.demo