Using Java to implement the file read and write function of Windows computers. When encountering a denial of access during writing, the computer should respond and ask the user to click whether to authorize or not
时间: 2024-01-22 17:18:47 浏览: 24
To implement file read and write functions in Java for Windows computers, you can use the standard Java I/O classes such as `File`, `FileReader`, `FileWriter`, `BufferedReader`, and `BufferedWriter`.
To handle access denial during writing, you can catch the `IOException` that may occur and then display a dialog box to the user asking for authorization. Here's an example of how you can achieve this:
```java
import java.io.*;
public class FileReadWriteExample {
public static void main(String[] args) throws IOException {
// create a file object
File file = new File("example.txt");
// create a new file writer
BufferedWriter writer = new BufferedWriter(new FileWriter(file));
// try to write to the file
try {
writer.write("Hello, world!");
} catch (IOException e) {
// if access is denied, ask the user for authorization
int option = JOptionPane.showConfirmDialog(null, "Access to file denied. Do you want to authorize?", "Access Denied", JOptionPane.YES_NO_OPTION);
// if the user authorizes, try to write to the file again
if (option == JOptionPane.YES_OPTION) {
// set the file to be writable
file.setWritable(true);
// try to write to the file again
writer.write("Hello, world!");
}
} finally {
// always close the writer
writer.close();
}
// create a new file reader
BufferedReader reader = new BufferedReader(new FileReader(file));
// read from the file
String line;
while ((line = reader.readLine()) != null) {
System.out.println(line);
}
// always close the reader
reader.close();
}
}
```
In this example, we create a file object and a writer object to write to the file. We then try to write to the file and catch any `IOException` that may occur. If access is denied, we display a dialog box asking the user for authorization. If the user authorizes, we set the file to be writable and try to write to the file again.
We then create a reader object to read from the file and print the contents to the console. Finally, we close both the writer and reader objects.