java实现对文件加解密操作

源文件：
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加密后的文件：

解密后的文件：

package com.gblfy.test;import java.io.*;/*** java 实现对文件加解密的方法** @author gblfy* @date 2020-12-08*/
public class IOSercet {//获取系统类型private static String OS = System.getProperty("os.name").toLowerCase();//加密后的路径public static final String secretFilePath = "I:/666/";//解密后的路径public static final String decrypFilePath = "I:/777/";public static void main(String[] args) {//1.测试批量加密(源文件路径和加密后的文件路径不一样)getAllFileNameSecret("I:/555/");//2.测试批量加密(加密文件的源路径和解密后的路径不一样)getAllFileNameDecrypt("I:/666/");}/*** 批量解密* 适用于加密文件的路径和解密后的路径不一样的业务场景* 获取指定目录下的所有文件及子类文件夹下的所有文件** @param path 指定需要解密的目录*/public static void getAllFileNameSecret(String path) {File file = new File(path);File[] tempList = file.listFiles();for (int i = 0; i < tempList.length; i++) {if (tempList[i].isFile()) {System.out.println("文     件：" + tempList[i]);secret(tempList[i].toString());}if (tempList[i].isDirectory()) {System.out.println("文件夹：" + tempList[i]);getAllFileNameSecret(tempList[i].getAbsolutePath());}}return;}/*** 批量解密* 适用于加密文件的路径和解密后的路径不一样的业务场景* 获取指定目录下的所有文件及子类文件夹下的所有文件** @param path 指定需要解密的目录*/public static void getAllFileNameDecrypt(String path) {File file = new File(path);File[] tempList = file.listFiles();for (int i = 0; i < tempList.length; i++) {if (tempList[i].isFile()) {System.out.println("文     件：" + tempList[i]);decrypt(tempList[i].toString());}if (tempList[i].isDirectory()) {System.out.println("文件夹：" + tempList[i]);getAllFileNameDecrypt(tempList[i].getAbsolutePath());}}return;}/*** 批量加密* 适用于源路径和加密后的路径不一样的业务场景** @param srcFileName 源文件名称*/public static void secret(String srcFileName) {long a = 0;long b = 0;createDir(secretFilePath);String secretFileName = getFileName(srcFileName);try {BufferedInputStream bis = new BufferedInputStream(new FileInputStream(srcFileName));BufferedOutputStream bos = new BufferedOutputStream(newFileOutputStream(secretFilePath + secretFileName));int n;a = System.currentTimeMillis();while ((n = bis.read()) != -1) {bos.write(n + 1);}b = System.currentTimeMillis();bis.close();bos.close();} catch (IOException e) {e.printStackTrace();}System.out.println("加密拷贝成功！");System.out.println("加密用时：" + (b - a) + "ms");}/*** 批量解密* 适用于加密文件的路径和解密后的路径不一样的业务场景** @param secretFileName 加密的文件名称*/public static void decrypt(String secretFileName) {long a = 0;long b = 0;try {createDir(decrypFilePath);String decryptFileName = getFileName(secretFileName);BufferedInputStream bis = new BufferedInputStream(new FileInputStream(secretFileName));BufferedOutputStream bos = new BufferedOutputStream(newFileOutputStream(decrypFilePath + decryptFileName));int n;a = System.currentTimeMillis();while ((n = bis.read()) != -1) {bos.write(n - 1);}b = System.currentTimeMillis();bis.close();bos.close();} catch (IOException e) {e.printStackTrace();}System.out.println("解密拷贝成功！");System.out.println("解密用时：" + (b - a) + "ms");}/*** 目录不存在，则批量创建** @param fileDir*/public static void createDir(String fileDir) {File file = new File(fileDir);//如果文件夹不存在则创建if (!file.exists() && !file.isDirectory()) {System.out.println("//不存在");file.mkdirs();}}/*** 文件名称处理** @param dealFileName* @return*/public static String getFileName(String dealFileName) {if (OS.indexOf("windows") >= 0) {//windowsreturn dealFileName.substring(dealFileName.lastIndexOf("\\") + 1);} else {//linuxreturn dealFileName.substring(dealFileName.lastIndexOf("/") + 1);}}
}