为什么我的程序拒绝访问创建文件的权限？ [英] Why is my program denying access to create a file?

问题描述

在我正在阅读的有关Java的书中，它通过使用写入文件并将其存储起来的程序演示了序列化。我遇到一个奇怪的错误，我不知道如何阅读，并且它拒绝我创建.txt文件。错误如下：

In the book I'm reading on Java, it demonstrates serialization by using a program that writes to a file and stores it away. I'm getting a strange error that I don't know how to read and it denies me access to creating a .txt file. Here's the error:

Exception in thread "main" java.io.FileNotFoundException: C:\testFile.txt (Access is denied)
    at java.io.FileOutputStream.open(Native Method)
    at java.io.FileOutputStream.<init>(Unknown Source)
    at java.io.FileOutputStream.<init>(Unknown Source)
    at serializableTests.MyProgram.main(MyProgram.java:18)

该程序有以下两个类别：

Here's the two classes for the program:

用户类别：

public class User implements Serializable {

    private static final long serialVersionUID = 4415605180317327265L;

    private String username;
    private String password;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

这是主要的类：

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.io.OutputStream;


public class MyProgram {
    public static void main(String[] args) throws IOException {
        User user = new User();
        user.setUsername("tpage");
        user.setPassword("password123");

        File file = new File("C:\\testFile.txt");
        OutputStream fileOutputStream = new FileOutputStream(file);
        ObjectOutputStream outputStream = new ObjectOutputStream(fileOutputStream);
        outputStream.writeObject(user);
        System.out.println("I've store the user object in a file called " + file.getName());
    }
}

输出

output

2019-04-22 08:40:28,895 [main] INFO  g.t.service.impl.CsvServiceImpl - Directory structure created data/test/tnx-log/tnc.log false 
2019-04-22 08:40:28,895 [main] INFO  g.t.service.impl.CsvServiceImpl - file.getAbsoluteFile() : C:\Users\jigar\apps\workspace\trade-publisher\data\test\tnx-log\tnc.log canWrite() : false
2019-04-22 08:40:28,895 [main] INFO  g.t.service.impl.CsvServiceImpl - txn log file created data/test/tnx-log/tnc.log true 

2019-04-22 08:40:28,957 [main] INFO  g.t.service.impl.CsvServiceImpl - Directory structure created data/test/tnx-log/tnc.log false 
2019-04-22 08:40:28,957 [main] INFO  g.t.service.impl.CsvServiceImpl - file.getAbsoluteFile() : C:\Users\jigar\apps\workspace\trade-publisher\data\test\tnx-log\tnc.log canWrite() : false


@Override
    public void createTxnInfoFile() throws IOException {
        File file = new File(txnLogFile);
        if (!file.exists()) {
            boolean directoryStructureCreated = file.getParentFile().mkdirs();
            logger.info("Directory structure created {} {} ", txnLogFile, directoryStructureCreated);
            logger.info("file.getAbsoluteFile() : " + file.getAbsoluteFile() + " canWrite() : " + file.canWrite());
            boolean fileCreated = file.createNewFile();
            logger.info("txn log file created {} {} ", txnLogFile, fileCreated);
        }
        file = null;
    }

推荐答案

在Windows的最新版本中，没有提升的特权，您将无法写入系统驱动器的根文件夹。

On recent versions of Windows, you cannot write to the root folder of the system drive without elevated privileges.

要使其正常运行，请将位置更改为另一个驱动器或更改为C中的子文件夹，例如您的配置文件目录。 c：\users\yourname\testfile.txt

To make it work, change the location to another drive or change to a subfolder in C, such as your profile directory, e.g. c:\users\yourname\testfile.txt

（请注意，您使用的是.txt结尾，但生成的文件在编辑器中无法读取。序列化是一种二进制格式。）

(Note that you're using a .txt ending but the file produced will not be readable in an editor. Serialization is a binary format.)

编辑：

要在代码更改中实现

File file = new File("C:\\testFile.txt");

类似

File file = new File("C:\\users\\bane\\testFile.txt");

我用过您的SO名称 bane-用您PC上的登录名替换

I've used your SO name "bane" - replace with whatever your login name is on your pc.

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