JAVA加密解密文件

最新推荐文章于 2024-08-12 16:25:56 发布

原创最新推荐文章于 2024-08-12 16:25:56 发布 · 160 阅读

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import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class DESFile {

   public static void main(String[] args) throws IOException {
       // secret("F:\\test\\test.png");
       decrypt("F:\\test\\test_sec.png");
   }

   // 加密
   public static void secret(String str) throws IOException {
       BufferedInputStream bis = new BufferedInputStream(new FileInputStream(str));
       String[] s = str.split("\\.");
       BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(s[0] + "_sec." + s[1]));
       int n;
       long a = System.currentTimeMillis();
       System.out.println("a=" + a);
       while ((n = bis.read()) != -1) {
           bos.write(n + 1);
           System.out.println(String.valueOf(n + 1));
       }
       long b = System.currentTimeMillis();
       System.out.println("b=" + b);
       bis.close();
       bos.close();
       System.out.println("加密拷贝成功！");
       System.out.println("加密用时：" + (b - a) + "ms");
   }

   // 解密
   public static void decrypt(String str) throws IOException {
       BufferedInputStream bis = new BufferedInputStream(new FileInputStream(str));
       String[] s = str.split("\\.");
       BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(s[0] + "_dec." + s[1]));
       int n;
       long a = System.currentTimeMillis();
       while ((n = bis.read()) != -1) {
           bos.write(n - 1);
           System.out.println((n - 1));
       }
       long b = System.currentTimeMillis();
       bis.close();
       bos.close();
       System.out.println("解密拷贝成功！");
       System.out.println("解密用时：" + (b - a) + "ms");
   }

}