Java如何設置檔為只讀？

在java編程中，如何設置檔為只讀？

此示例演示如何使用File類的file.setReadOnly()和file.canWrite()方法設置檔為只讀模式。

package com.zaixian;

import java.io.File;

public class ReadOnlyFile {

    public static void main(String[] args) {
        File file = new File("F:/worksp/javaexamples/java_files/myfile.txt");
        System.out.println(file.setReadOnly());
        System.out.println(file.canWrite());
    }
}

執行上述示例代碼，將產生以下結果 -

true
false

示例-2

以下是java中設置檔只讀的另一個示例

package com.zaixian;

import java.io.File;
import java.io.IOException;

public class ReadOnlyFile2 {
    public static void main(String[] args) throws IOException {
        File file = new File("F:/worksp/javaexamples/java_files/myfile.txt");
        file.setReadOnly();

        if (file.canWrite()) {
            System.out.println("This file is writable");
        } else {
            System.out.println("This file is read only");
        }
        file.setWritable(true);
        if (file.canWrite()) {
            System.out.println("This file is writable");
        } else {
            System.out.println("This file is read only");
        }
    }
}

執行上述示例代碼，將產生以下結果 -

This file is read only
This file is writable