怎么加密怎么解密？

try (FileInputStream in = new FileInputStream(args[1]);
     FileOutputStream out = new FileOutputStream(args[2])
) {
    for (int read; (read = in.read()) != -1; ) out.write(read ^ 789);
} catch (IOException e) {
    e.printStackTrace();
}

这么写大家好理解点 public static void main(String[] args) throws IOException { FileInputStream fileInputStream = new FileInputStream(args[1]); FileOutputStream fileOutputStream = new FileOutputStream(args[2]); switch (args[0]){ case "-e" : encryption(fileInputStream,fileOutputStream); case "-d" : decrypt(fileInputStream,fileOutputStream); } } /** * 加密方法 * @param fileName * @param fileOutputName */ public static void encryption(FileInputStream fileInputStream, FileOutputStream fileOutputStream) throws IOException { while (fileInputStream.available() > 0){ fileOutputStream.write(fileInputStream.read()+1); } fileInputStream.close(); fileOutputStream.close(); } /** * 解密方法 * @param fileName * @param fileOutputName */ public static void decrypt(FileInputStream fileInputStream, FileOutputStream fileOutputStream) throws IOException { while (fileInputStream.available() > 0){ fileOutputStream.write(fileInputStream.read()-1); } fileInputStream.close(); fileOutputStream.close(); }

public static void main(String[] args) throws IOException { FileInputStream in = new FileInputStream(args[1]); FileOutputStream out = new FileOutputStream(args[2]); int data; switch (args[0]) { case "-e": while ((data = in.read()) > -1) { out.write(data + 1); } break; case "-d": while ((data = in.read()) > -1) { out.write(data - 1); } break; } in.close(); out.close(); } }