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java实现对文件加解密操作
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源文件：
加密后的文件：
解密后的文件：
package com.gblfy.test
;import java.io.*
;/*** java 實現對文件加解密的方法** @author gblfy* @date 2020-12-08*/
public class IOSercet
{//獲取系統類型private static String OS
= System.getProperty
("os.name").toLowerCase
();//加密后的路徑public static final String secretFilePath
= "I:/666/";//解密后的路徑public static final String decrypFilePath
= "I:/777/";public static void main
(String
[] args
) {//1.測試批量加密
(源文件路徑和加密后的文件路徑不一樣
)getAllFileNameSecret
("I:/555/");//2.測試批量加密
(加密文件的源路徑和解密后的路徑不一樣
)getAllFileNameDecrypt
("I:/666/");}/*** 批量解密* 適用于加密文件的路徑和解密后的路徑不一樣的業務場景* 獲取指定目錄下的所有文件及子類文件夾下的所有文件** @param path 指定需要解密的目錄*/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
("文件夾：" + tempList
[i
]);getAllFileNameSecret
(tempList
[i
].getAbsolutePath
());}}return;}/*** 批量解密* 適用于加密文件的路徑和解密后的路徑不一樣的業務場景* 獲取指定目錄下的所有文件及子類文件夾下的所有文件** @param path 指定需要解密的目錄*/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
("文件夾：" + tempList
[i
]);getAllFileNameDecrypt
(tempList
[i
].getAbsolutePath
());}}return;}/*** 批量加密* 適用于源路徑和加密后的路徑不一樣的業務場景** @param srcFileName 源文件名稱*/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
("加密拷貝成功！");System.out.println
("加密用時：" +
(b - a
) +
"ms");}/*** 批量解密* 適用于加密文件的路徑和解密后的路徑不一樣的業務場景** @param secretFileName 加密的文件名稱*/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
("解密拷貝成功！");System.out.println
("解密用時：" +
(b - a
) +
"ms");}/*** 目錄不存在，則批量創建** @param fileDir*/public static void createDir
(String fileDir
) {File
file = new File
(fileDir
);//如果文件夾不存在則創建
if (!file.exists
() && !file.isDirectory
()) {System.out.println
("//不存在");file.mkdirs
();}}/*** 文件名稱處理** @param dealFileName* @return*/public static String getFileName
(String dealFileName
) {if (OS.indexOf
("windows") >= 0
) {//windows
return dealFileName.substring
(dealFileName.lastIndexOf
("\\") + 1
);} else {//linux
return dealFileName.substring
(dealFileName.lastIndexOf
("/") + 1
);}}
}
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