Java基础之访问文件与目录——测试文件或目录的路径（TryPath）

控制台程序，测试文件或目录的路径。

 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.nio.file.FileSystem;
 import java.nio.file.FileSystems;
 import java.nio.file.Files;
 import java.nio.file.attribute.BasicFileAttributes;
 import java.io.IOException;

 public class TryPath{
     public static void main(String[] args){
         FileSystem fileSystem=FileSystems.getDefault();

         Path path=fileSystem.getPath("garbage.java");
         checkPath(path);

         path=Paths.get(System.getProperty("user.dir"));
         checkPath(path);

         //Amend the following path to your environment
         path=fileSystem.getPath("E:","JavaProject","BeginningJava","Ch9_Directories","TryPath","TryPath.java");
         checkPath(path);

         return;
     }

     //check the attributes of a path
     static void checkPath(Path path){
         System.out.println("\n"+path+" has "+path.getNameCount() + " elements.");

         if(path.isAbsolute()){
             System.out.println(path + "is an absolute path.");
             System.out.println("The parent path is "+path.getParent());
             System.out.println("The root is "+path.getRoot());
         }
         else{
             System.out.println(path + " is a relative path.");
             path=path.toAbsolutePath();
         }

         if(Files.notExists(path)){
             System.out.println(path + " does not exist.");
             return;
         }

         try {
             BasicFileAttributes attr=Files.readAttributes(path,BasicFileAttributes.class);

             if(attr.isDirectory())
                 System.out.println(path.getFileName() + " is a directory.");
             else if(attr.isRegularFile()){
                 System.out.println(path.getFileName() + " is a file containing " + attr.size() + " bytes.");
             }
             System.out.println(path + " was created " + attr.creationTime());
             System.out.println(path + " was last accessed " + attr.lastAccessTime());
             System.out.println(path + " was last modified " + attr.lastModifiedTime());
             System.out.println(path + " is " + attr.size() + " bytes.");
         }catch(IOException e){
             System.err.println(e);
         }
     }
 }