How to make a file read only in java

摘要：在这篇文章中，我们将看到如何在java中创建只读文件。它是非常简单的。您需要调用java.io。文件的setReadOnly()方法。

1) How to make a file read only

Java program:

package cn.micai.io;

import java.io.File;

/**
 * 描述：How to make a file read only in java
 * <p>
 *
 * @author: 赵新国
 * @date: 2018/6/7 14:13
 */
public class FileHiddenMain {

    public static void main(String [] args) {
        System.out.println("-----------------");
        // Read the file
        File configFile = new File("src/main/resources/config.properties");
        configFile.setReadOnly();

        if (configFile.canWrite()) {
            System.out.println("Config file can be writtern");
        } else {
            System.out.println("config file is read only");
        }
        System.out.println("-----------------");
        

    }
}

当您运行在程序之上时，您将得到以下输出：

2) How to make it writable  again

如果您只完成了文件读取，那么您可以通过使用setWritable（true）来再次使文件可写。这个方法是在java 1.6中引入的。

Java program:

package cn.micai.io;

import java.io.File;

/**
 * 描述：How to make a file read only in java
 * <p>
 *
 * @author: 赵新国
 * @date: 2018/6/7 14:13
 */
public class FileHiddenMain {

    public static void main(String [] args) {
        System.out.println("-----------------");
        // Read the file
        File configFile = new File("src/main/resources/config.properties");
        configFile.setReadOnly();

        if (configFile.canWrite()) {
            System.out.println("Config file can be writtern");
        } else {
            System.out.println("config file is read only");
        }
        System.out.println("-----------------");

        System.out.println("Making config file writable again");
        // this method is available from jdk 1.6
        configFile.setWritable(true);

        if(configFile.canWrite()) {
            System.out.println("Config file can be written");
        } else {
            System.out.println("config file is read only");
        }
        System.out.println("-----------------");

    }
}

当您运行在程序之上时，您将得到以下输出：