Java如何設定檔案為唯讀？

在java程式設計中，如何設定檔案為唯讀？

此範例演示如何使用File類的file.setReadOnly()和file.canWrite()方法設定檔案為唯讀模式。

package com.yiibai;

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());
    }
}

執行上述範例程式碼，將產生以下結果 -

true
false

範例-2

以下是java中設定檔案唯讀的另一個範例

package com.yiibai;

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");
        }
    }
}

執行上述範例程式碼，將產生以下結果 -

This file is read only
This file is writable