Java Linux文件属性、lastModifiedTime、lastAccessTime、creationTime_Java_Linux_File Io

Java Linux文件属性、lastModifiedTime、lastAccessTime、creationTime

java linux file-io

Java Linux文件属性、lastModifiedTime、lastAccessTime、creationTime,java,linux,file-io,Java,Linux,File Io,我对Linux（Ubuntu）和文件属性有问题。我需要获取一些关于文件的数据，我需要的最重要的数据是lastModifiedTime，lastAccessTime，creationTime。在这里，我使用stat exception/EmptyAttributesListException.java命令，获取有关此文件的数据。问题是我的所有文件都具有相同的lastModifiedTime和creationTime。我想是关于Ubuntu的 File: exception/EmptyAttri

我对Linux（Ubuntu）和文件属性有问题。我需要获取一些关于文件的数据，我需要的最重要的数据是

lastModifiedTime

，

lastAccessTime

，

creationTime

。在这里，我使用

stat exception/EmptyAttributesListException.java

命令，获取有关此文件的数据。问题是我的所有文件都具有相同的lastModifiedTime和creationTime。我想是关于Ubuntu的

  File: exception/EmptyAttributesListException.java
  Size: 243         Blocks: 8          IO Block: 4096   regular file
Device: 807h/2055d  Inode: 4196285     Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/  denisu)   Gid: ( 1000/  denisu)
Access: 2020-10-07 23:18:00.011710418 +0300
Modify: 2020-10-07 23:17:58.795607161 +0300
Change: 2020-10-07 23:17:58.795607161 +0300
 Birth: -

这也是我用来获取文件属性的java代码

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;

import java.io.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.FileTime;
import java.nio.file.attribute.UserPrincipal;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Optional;

@AllArgsConstructor
@NoArgsConstructor
@Data
@ToString
public final class FileAttribute {

    private Path basePath;
    private LocalDateTime lastModifiedTime;
    private LocalDateTime lastAccessTime;
    private LocalDateTime creationTime;
    private Long size;
    private Boolean isRegularFile;
    private Boolean isDirectory;
    private Boolean isSymbolicLink;
    private Boolean isOther;
    private UserPrincipal owner;
    private Optional<Path> relativePath;
    private long lines;

    public FileAttribute(Path filePath) throws IOException {
        BasicFileAttributes attr = Files.readAttributes(filePath, BasicFileAttributes.class);
        this.basePath = filePath;

        this.creationTime = LocalDateTime.ofInstant(
                attr.creationTime().toInstant(),
                ZoneId.systemDefault());

        this.lastAccessTime = LocalDateTime.ofInstant(
                attr.lastAccessTime().toInstant(),
                ZoneId.systemDefault());

        this.lastModifiedTime = LocalDateTime.ofInstant(
                attr.lastModifiedTime().toInstant(),
                ZoneId.systemDefault());

        System.out.println(filePath);
        System.out.println("Creation: " + attr.creationTime());
        System.out.println("Access: " + attr.lastAccessTime());
        System.out.println("Modified: " + attr.lastModifiedTime());

        System.out.println("Creation: " + this.creationTime);
        System.out.println("Access: " + this.lastAccessTime);
        System.out.println("Modified: " + this.lastModifiedTime);

        System.out.println(this.creationTime.equals(this.lastModifiedTime));
        System.out.println(attr.creationTime().equals(attr.lastModifiedTime()) + "\n");

        this.isDirectory = attr.isDirectory();
        this.isOther = attr.isOther();
        this.isRegularFile = attr.isRegularFile();
        this.isSymbolicLink = attr.isSymbolicLink();
        this.size = attr.size();
        this.owner = Files.getOwner(filePath);
        this.relativePath = Optional.empty();
        this.lines = countLines(this.basePath);
    }

    public FileAttribute(Path filePath, Path fileRelativePath) throws IOException {
        BasicFileAttributes attr = Files.readAttributes(filePath, BasicFileAttributes.class);
        this.basePath = filePath;

        this.creationTime = LocalDateTime.ofInstant(
                attr.creationTime().toInstant(),
                ZoneId.systemDefault());

        this.lastAccessTime = LocalDateTime.ofInstant(
                attr.lastAccessTime().toInstant(),
                ZoneId.systemDefault());

        this.lastModifiedTime = LocalDateTime.ofInstant(
                attr.lastModifiedTime().toInstant(),
                ZoneId.systemDefault());

        System.out.println(filePath);
        System.out.println("Creation: " + attr.creationTime());
        System.out.println("Access: " + attr.lastAccessTime());
        System.out.println("Modified: " + attr.lastModifiedTime());

        System.out.println("Creation: " + this.creationTime);
        System.out.println("Access: " + this.lastAccessTime);
        System.out.println("Modified: " + this.lastModifiedTime);

        System.out.println(this.creationTime.equals(this.lastModifiedTime));
        System.out.println(attr.creationTime().equals(attr.lastModifiedTime()) + "\n");

        this.isDirectory = attr.isDirectory();
        this.isOther = attr.isOther();
        this.isRegularFile = attr.isRegularFile();
        this.isSymbolicLink = attr.isSymbolicLink();
        this.size = attr.size();
        this.owner = Files.getOwner(filePath);
        this.relativePath = Optional.of(fileRelativePath);
        this.lines = countLines(this.basePath);
    }
}

我知道这些文件不是在同一时间创建和修改的，因为它们是我项目的一部分，我一直在添加代码。

我的理解是，虽然ext4能够存储创建时间（“出生”时间），但实际上没有内核设置它。注意您的

stat

输出如何显示

Birth:-

。这意味着没有可用的创建时间。

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true
true

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true
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