Java NIO、NIO.2学习笔记(七)
java.nio.file.*;
import java.nio.*;
import java.nio.charset.*;
import java.nio.file.attribute.*;
public class AttributeViewTest
{
public static void main(String[] args) throws Exception
{
// 获取将要操作的文件
Path testPath = Paths.get("AttributeViewTest.java");
// 获取访问基本属性的BasicFileAttributeView
BasicFileAttributeView basicView = Files.getFileAttributeView(testPath , BasicFileAttributeView.class);
// 获取访问基本属性的BasicFileAttributes
BasicFileAttributes basicAttribs = basicView.readAttributes();
// 访问文件的基本属性
System.out.println("创建时间：" + new Date(basicAttribs.creationTime().toMillis()));
System.out.println("最后访问时间：" + new Date(basicAttribs.lastAccessTime().toMillis()));
System.out.println("最后修改时间：" + new Date(basicAttribs.lastModifiedTime().toMillis()));
System.out.println("文件大小：" + basicAttribs.size());
// 获取访问文件属主信息的FileOwnerAttributeView
FileOwnerAttributeView ownerView = Files.getFileAttributeView(testPath, FileOwnerAttributeView.class);
// 获取该文件所属的用户
System.out.println(ownerView.getOwner());
// 获取系统中guest对应的用户
UserPrincipal user = FileSystems.getDefault().getUserPrincipalLookupService().lookupPrincipalByName("guest");
// 修改用户
ownerView.setOwner(user);
// 获取访问自定义属性的FileOwnerAttributeView
UserDefinedFileAttributeView userView = Files.getFileAttributeView(testPath, UserDefinedFileAttributeView.class);
List attrNames = userView.list();
// 遍历所有的自定义属性
for (String name : attrNames)
{
ByteBuffer buf = ByteBuffer.allocate(userView.size(name));
userView.read(name, buf);
buf.flip();
String value = Charset.defaultCharset().decode(buf).toString();
System.out.println(name + "--->" + value) ;
}
// 添加一个自定义属性
userView.write("发行者", Charset.defaultCharset().encode("疯狂Java联盟"));
// 获取访问DOS属性的DosFileAttributeView
DosFileAttributeView
dosView = Files.getFileAttributeView(testPath, DosFileAttributeView.class);
// 将文件设置隐藏、只读
dosView.setHidden(true);
dosView.setReadOnly(true);
}
}
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