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Copy pathEncrypt.java
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130 lines (117 loc) · 3.12 KB
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import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
public class Encrypt {
/**
* @author crazykay
* @see "在异或运算中，对于两个变量 x,y 满足 (x^y^y)==x"
*/
// 加密数值（可随意设定）
private static final int PASSWORD = 01234567;
// 设置加密文件后缀（可随意设定）
private static final String SUFFIX = ".enc";
// path指定加密文件路径
public void doEncrypt(String path) {
FileInputStream in = null;
FileOutputStream out = null;
try {
int tmp = 0;
File inFile = new File(path);
in = new FileInputStream(inFile);
File outFile = new File(path + SUFFIX);
out = new FileOutputStream(outFile);
while ((tmp = in.read()) != -1) {
// 加密处理
out.write(tmp ^ PASSWORD);
}
} catch (FileNotFoundException e) {
System.err.println("文件不存在！！");
} catch (IOException e) {
System.err.println("文件读取异常！！");
} finally {
// finally块关闭流操作
try {
if (in != null) {
in.close();
}
if (out != null) {
out.close();
}
} catch (IOException e) {
System.err.println("关闭流失败！！");
}
}
}
// path指定解密文件路径
public void doDecrypt(String path) {
int index = path.lastIndexOf(SUFFIX);
if (index != path.length() - SUFFIX.length()) {
System.err.println("文件类型不正确！！");
return;
}
FileInputStream in = null;
FileOutputStream out = null;
try {
int tmp = 0;
File inFile = new File(path);
in = new FileInputStream(inFile);
String name = path.substring(0, index);
File outFile = new File(name);
out = new FileOutputStream(outFile);
while ((tmp = in.read()) != -1) {
// 再次异或PASSWORD实现解密
out.write(tmp ^ PASSWORD);
}
} catch (FileNotFoundException e) {
System.err.println("文件不存在！！");
} catch (IOException e) {
System.err.println("文件读取异常！！");
} finally {
// finally块关闭流操作
try {
if (in != null) {
in.close();
}
if (out != null) {
out.close();
}
} catch (IOException e) {
System.err.println("关闭流失败！！");
}
}
}
public static void main(String[] args) {
Encrypt encrypt = new Encrypt();
// 第一个参数指定操作（加密/解密）
// 第二个参数制定文件所在路径
if (args.length != 2) {
System.err.println("参数设置不正确");
System.out.println();
System.out.println("java Encrypt [OPTION] [FILE PATH]");
System.out.println("\tencrypt\t-e\t加密\n\tdecrypt\t-d\t解密");
return;
}
switch (args[0]) {
case "encrypt":
encrypt.doEncrypt(args[1]);
break;
case "-e":
encrypt.doEncrypt(args[1]);
break;
case "decrypt":
encrypt.doDecrypt(args[1]);
break;
case "-d":
encrypt.doDecrypt(args[1]);
break;
default:
System.err.println("参数设置不正确");
System.out.println();
System.out.println("java Encrypt [OPTION] [FILE PATH]");
System.out.println("\tencrypt\t-e\t加密\n\tdecrypt\t-d\t解密");
break;
}
}
}