凯哥学堂

使用装饰设计模式加密数据：

package com.zs.JiaJiE09;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
 * 使用装饰设计模式把数据取反进行加密解密
 * Key方法为钥匙
 *
 * @author LZG
 *
 */

public class JMOutputStream extends OutputStream{
/**
 * 更多资料欢迎浏览凯哥学堂官网：http://kaige123.com 

 * @author 小沫
 */

    private int key;
    private OutputStream output;
    public JMOutputStream(OutputStream output){
        this.output=output;

    }
    public void Key(int key){
        this.key=key;
    }

    public void write(int b) throws IOException {
        output.write(~b+key);
    }


    public void write(byte[] b, int off, int len) throws IOException {
        for (int i = off; i < len; i++) {
            output.write(~b[i]+key);
        }
    }

    public void write(byte[] b) throws IOException {
        for (int i = 0; i < b.length; i++) {
            output.write(~b[i]+key);
        }
    }

}

测试类：

package com.zs.JiaJiE09;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class Test {
/**
 * 更多资料欢迎浏览凯哥学堂官网：http://kaige123.com 

 * @author 小沫
 */

    public static void main(String[] args) throws IOException{


        FileInputStream fin= new FileInputStream("e:/test/aa.txt");

        JMOutputStream fout = new JMOutputStream(new FileOutputStream("d:/test/aa111.txt"));
        fout.Key(1402);
        byte[] b = new byte[1024];

        while(fin.available()!=0){
            int len = fin.read(b);
            fout.write(b, 0, len);
        }

        fin.close();
        fout.close();
    }
}