处理流_图片的加密与解密

package com.zhou.exer;

import org.junit.jupiter.api.Test;

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

/**
 * @author upzhou
 * @create 2022-03-30 16:14
 */
public class PicTest {

    //图片的加密
    @Test
    public void test1(){

        FileInputStream fis = null;
        FileOutputStream fos = null;
        try {
            fis = new FileInputStream("小猫.jpg");
            fos = new FileOutputStream("小猫secret.jpg");

            byte[] buffer = new byte[20];
            int len;
            while ((len = fis.read(buffer)) != -1){
                //字节数组进行修改
                for (int i = 0; i < len; i++) {
                    buffer[i] = (byte) (buffer[i] ^ 5);
                }

                fos.write(buffer,0,len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (fos != null){
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                if (fis != null){
                    try {
                        fis.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }

    //图片的解密
    @Test
    public void test2(){

        FileInputStream fis = null;
        FileOutputStream fos = null;
        try {
            fis = new FileInputStream("小猫secret.jpg");
            fos = new FileOutputStream("小猫4.jpg");

            byte[] buffer = new byte[20];
            int len;
            while ((len = fis.read(buffer)) != -1){
                //字节数组进行修改
                for (int i = 0; i < len; i++) {
                    buffer[i] = (byte) (buffer[i] ^ 5);
                }

                fos.write(buffer,0,len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (fos != null){
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                if (fis != null){
                    try {
                        fis.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }
}