java safefile类
时间: 2023-11-20 16:53:42 浏览: 48
Java中没有内置的SafeFile类,但您可以自己创建一个类来实现文件的安全操作。您可以使用Java IO流来读取和写入文件,以确保文件的安全性。在读取和写入文件时,您可以使用try-catch块来捕获可能出现的异常,例如FileNotFoundException和IOException。此外,您还可以使用Java的加密库来加密和解密文件,以确保文件的安全性。
以下是一个示例代码,演示如何使用Java IO流来读取和写入文件,并使用Java加密库来加密和解密文件:
```java
import java.io.*;
import javax.crypto.*;
import javax.crypto.spec.*;
public class SafeFile {
private static final String ALGORITHM = "AES";
private static final String TRANSFORMATION = "AES/CBC/PKCS5Padding";
private static final byte[] KEY = "MySecretKey12345".getBytes();
private static final byte[] IV = "RandomInitVector".getBytes();
public static void encryptFile(File inputFile, File outputFile) throws Exception {
Key secretKey = new SecretKeySpec(KEY, ALGORITHM);
IvParameterSpec iv = new IvParameterSpec(IV);
Cipher cipher = Cipher.getInstance(TRANSFORMATION);
cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
FileInputStream inputStream = new FileInputStream(inputFile);
byte[] inputBytes = new byte[(int) inputFile.length()];
inputStream.read(inputBytes);
byte[] outputBytes = cipher.doFinal(inputBytes);
FileOutputStream outputStream = new FileOutputStream(outputFile);
outputStream.write(outputBytes);
inputStream.close();
outputStream.close();
}
public static void decryptFile(File inputFile, File outputFile) throws Exception {
Key secretKey = new SecretKeySpec(KEY, ALGORITHM);
IvParameterSpec iv = new IvParameterSpec(IV);
Cipher cipher = Cipher.getInstance(TRANSFORMATION);
cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
FileInputStream inputStream = new FileInputStream(inputFile);
byte[] inputBytes = new byte[(int) inputFile.length()];
inputStream.read(inputBytes);
byte[] outputBytes = cipher.doFinal(inputBytes);
FileOutputStream outputStream = new FileOutputStream(outputFile);
outputStream.write(outputBytes);
inputStream.close();
outputStream.close();
}
}
```
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