java 自定义加密和解密文件

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package game01;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;
import java.util.Scanner;

public class Tool {
	public static FileInputStream fis =null;
	public static FileOutputStream fos =null;
	public static long start;//计时
	public static long end; 
	public static String jiamilj = null;
	public static String jiemilj = null;
	public static FileChannel fc = null;//文件大小
	
	
	public static void main(String []args) throws IOException{
		
		Scanner in = new Scanner(System.in);
		System.out.println("你要加密还是解密：");
		String input = in.next();
		
		if(input.equals("加密")){
			
			Scanner in01 = new Scanner(System.in);
			System.out.println("你要加密的文件路径：（E:\\a.txt）:");
			String input01 = in01.next();
			System.out.println(input01);
			
			jiami(input01);
			System.out.println("加密成功，加密路径："+jiamilj);
			System.out.println("加密用时"+(end-start)+"毫秒");
			size(1);
			System.out.println("文件大小"+fc.size()+"Byte");
			fis.close();
			fos.close();
		}else{
			Scanner in02 = new Scanner(System.in);
			System.out.println("你要解密的文件路径：（E:\\b.txt）:");
			String input02 = in.next();
			jiemi(input02);
			System.out.println("解密成功,解密路径为："+jiemilj);
			System.out.println("解密密用时"+(end-start)+"毫秒");
			size(2);
			System.out.println("文件大小"+fc.size()+"Byte");
			fis.close();
			fos.close();
		}	
		
		
	}
	
	
	//加密
	public static void jiami(String input02) throws IOException{
		start = System.currentTimeMillis();
		in01(input02);
		end = System.currentTimeMillis();
	}
	//解密
	public static void jiemi(String input02) throws IOException{
		start = System.currentTimeMillis();
		in02(input02);
		end = System.currentTimeMillis();
	}
	
	
	//配套加密
	public static void in01(String input03) throws IOException{
		 fis = new FileInputStream(input03);		
		int i;  //核心代码  
		while((i=fis.read())!=-1){			
			out01(i);
		}
		
	}	
	public static void out01(int i) throws IOException{
		 fos = new FileOutputStream("E:\\b.txt",true);
		fos.write(i+1);	
		jiamilj = "E:\\b.txt";
	}
	
	
	//配套解密
	public static void in02(String input03) throws IOException{
		fis = new FileInputStream(input03);		
		int i;  //核心代码  
		while((i=fis.read())!=-1){
			out02(i);
		}	
	}
	public static void out02(int i) throws IOException{
		 fos = new FileOutputStream("E:\\c.txt",true);
		fos.write(i-1);	
		jiemilj = "E:\\c.txt";
	}
	
	//求文件大小
	public static void size(int s) throws FileNotFoundException{
		if(s==1){
			FileInputStream fis01 = new FileInputStream("E:\\b.txt");
			fc = fis01.getChannel();
		}else{
			FileInputStream fis01 = new FileInputStream("E:\\c.txt");
			fc = fis01.getChannel();
		}
		
	}

}

本文地址：https://blog.csdn.net/xiaomingpeng/article/details/109928318