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Copy pathjava-file-attr.java
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119 lines (104 loc) · 3.67 KB
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属性 |
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# java.nio.file.attribute
* 支持很详细的属性设置,包括权限等等
# 属性的最顶层接口
# 体系
AttributeView
|-FileAttributeView(文件属性接口)
|-BasicFileAttributeView
* 基本文件属性接口
|-PosixFileAttributes
* 软连接文件属性接口
|-UserDefinedFileAttributeView
* 用户自定义属性接口
|-FileOwnerAttributeView
* 文件所有者属性接口
|-AclFileAttributeView
* acl权限属性接口
|-FileStoreAttributeView(磁盘分区属性接口)
FileAttribute
# 属性接口
# 俩抽象方法
String name();
T value();
PosixFilePermission
# 权限属性枚举类
# 所有者权限
OWNER_READ,
OWNER_WRITE,
OWNER_EXECUTE,
# 所属组权限
GROUP_READ,
GROUP_WRITE,
GROUP_EXECUTE,
# 其他人权限
OTHERS_READ,
OTHERS_WRITE,
OTHERS_EXECUTE;
PosixFilePermissions
# 权限属性对象工具类
# 无法实例化对象,都是静态方法
Set<PosixFilePermission> fromString(String perms);
# 根据Linux的权限设置字符串,来创建一组 PosixFilePermission 对象
# "rw-------"
FileAttribute<Set<PosixFilePermission>> asFileAttribute(Set<PosixFilePermission> perms);
# 把一组 PosixFilePermission 转换为文件属性对象
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BasicFileAttributeView 接口方法 |
--------------------------------
BasicFileAttributes readAttributes();
* 获取文件属性
void setTimes(FileTime lastModifiedTime,FileTime lastAccessTime, FileTime createTime)
* 直接设置仨个时间相关的属性
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BasicFileAttributes |
--------------------------------
# 文件属性描述对象
# 获取
BasicFileAttributes basicFileAttributes = Files.readAttributes(path,BasicFileAttributes.class);
# 实例方法
FileTime lastModifiedTime();
FileTime lastAccessTime();
FileTime creationTime();
boolean isRegularFile();
boolean isDirectory();
boolean isSymbolicLink();
boolean isOther();
long size();
Object fileKey();
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获取文件属性 |
--------------------------------
Path path = Paths.get("/temp/demo.txt");
1,直接获取指定的属性
long size = (Long) Files.getAttribute(path, "basic:size", java.nio.file.LinkOption.NOFOLLOW_LINKS);
2,根据接口类型,获取属性View
<V extends FileAttributeView> V Files.getFileAttributeView(Path path,Class<V> type,LinkOption... options)
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设置文件属性 |
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Path path = Paths.get("/temp/demo.txt");
FileTime fileTime = FileTime.fromMillis(new Date().getTime());
Files.setAttribute(path, "basic:lastModifiedTime", fileTime, LinkOption.NOFOLLOW_LINKS); //最后修改时间
Files.setAttribute(path, "basic:creationTime", fileTime, LinkOption.NOFOLLOW_LINKS); //创建时间
Files.setAttribute(path, "basic:lastAccessTime", fileTime, LinkOption.NOFOLLOW_LINKS); //最后访问时间
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修改文件属性 |
--------------------------------
long time = System.currentTimeMillis();
FileTime fileTime = FileTime.fromMillis(time);
BasicFileAttributeView basicFileAttributeView = Files.getFileAttributeView(path, BasicFileAttributeView.class);
basicFileAttributeView.setTimes(fileTime, fileTime, fileTime);
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权限设置 |
---------------------------
Set<PosixFilePermission> perms = PosixFilePermissions.fromString("rw-------");
FileAttribute<Set<PosixFilePermission>> attrs = PosixFilePermissions.asFileAttribute(perms);
Files.setPosixFilePermissions(path,attrs)
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获取ACL权限 |
---------------------------
AclFileAttributeView aclview = Files.getFileAttributeView(path, AclFileAttributeView.class);
List<AclEntry> acllist = aclview.getAcl();