【Java学习笔记】文件信息

作者：gnuhpc
出处：http://www.cnblogs.com/gnuhpc/

文件路径：

import java.io.File;
public class FilePath {
    public static void main(String arg[]) {
        String pname1 =
            File.separator + "stuff" +
            File.separator + "vtc" +
            File.separator + "java6" +
            File.separator + "1204";
        System.out.println(pname1);
        String pname2 =
            File.separator + "stuff" +
            File.separator + "bin";
        System.out.println(pname2);
        String path = pname1 + File.pathSeparator + pname2;
        System.out.println(path);
    }
}

从文件名得到文件路径信息：

import java.io.File;
import java.io.IOException;
public class FileNames {
    public static void main(String arg[]) {
        File file;
        try {
            file = new File("FileNames.java");
            System.out.println("Name: " + file.getName());
            System.out.println("Parent: " + file.getParent());
            System.out.println("Path: " + file.getPath());
            System.out.println("Absolute path: " + file.getAbsolutePath());
            System.out.println("Canonical path: " + file.getCanonicalPath());
            System.out.println();
            file = new File(
                File.separator + "home" +
                File.separator + "doc" +
                File.separator + "vtc" +
                File.separator + "java6" +
                File.separator + "1204");
            System.out.println("Name: " + file.getName());
            System.out.println("Parent: " + file.getParent());
            System.out.println("Path: " + file.getPath());
            System.out.println("Absolute path: " + file.getAbsolutePath());
            System.out.println("Canonical path: " + file.getCanonicalPath());
            System.out.println();
            file = new File(".");
            System.out.println("Name: " + file.getName());
            System.out.println("Parent: " + file.getParent());
            System.out.println("Path: " + file.getPath());
            System.out.println("Absolute path: " + file.getAbsolutePath());
            System.out.println("Canonical path: " + file.getCanonicalPath());
            System.out.println();
        } catch(IOException e) {
            System.out.println(e);
        }
    }
}

文件信息：

import java.io.File;
import java.io.IOException;
public class FileInfo {
    public static void main(String arg[]) {
        File file;
        if(arg.length != 1) {
            System.out.println("Usage: java FileInfo <filename>");
            return;
        }
        try {
            file = new File(arg[0]);
            System.out.println("Canonical path: " + file.getCanonicalPath());
            System.out.println("Is a normal file: " + file.isFile());
            System.out.println("Is a directory: " + file.isDirectory());
            System.out.println("Is a hidden file: " + file.isHidden());
            System.out.println("Can execute: " + file.canExecute());
            System.out.println("Can read: " + file.canRead());
            System.out.println("Can Write: " + file.canWrite());
            System.out.println("Path name is absolute: " + file.isAbsolute());
            System.out.println("Length of file: " + file.length());
            if(file.isDirectory()) {
                String name[] = file.list();
                for(int i=0; i<name.length; i++)
                    System.out.println("        " + name[i]);
            }
        } catch(IOException e) {
            System.out.println(e);
        }
    }
}

作者：gnuhpc
出处：http://www.cnblogs.com/gnuhpc/