Java （三）APACHE Commons IO 常规炒

 1 import java.io.File;
 2 
 3 import org.apache.commons.io.FileUtils;
 4 
 5 public class Main {
 6 
 7     public static void main(String[] args) {
 8         long length = FileUtils.sizeOf(new File("J:/PrtSc/20190321/1.png"));
 9         System.out.println(length);
10         
11         length = FileUtils.sizeOf(new File("J:/PrtSc/20190321"));
12         System.out.println(length);
13         
14         length = FileUtils.sizeOfDirectory(new File("J:/PrtSc/20190321"));
15         System.out.println(length);
16     }
17 }

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 1 import java.io.File;
 2 import java.util.Collection;
 3 
 4 import org.apache.commons.io.FileUtils;
 5 import org.apache.commons.io.filefilter.EmptyFileFilter;
 6 
 7 public class Main {
 8 
 9     public static void main(String[] args) {
10         System.out.println(System.getProperty("user.dir") + "\n");
11         
12         Collection<File> files1 = FileUtils.listFiles(new File(System.getProperty("user.dir")), EmptyFileFilter.NOT_EMPTY, null);
13         for (File file: files1) {
14             System.out.println(file.getAbsolutePath());
15         }
16         
17         System.out.println("\n" + new File("empty.txt").length() + " bytes");
18     }
19 }

I:\Java\mycode\CommonsIO

I:\Java\mycode\CommonsIO\.classpath
I:\Java\mycode\CommonsIO\.project

0 bytes

I:\Java\mycode\CommonsIO

I:\Java\mycode\CommonsIO\.classpath
I:\Java\mycode\CommonsIO\.project
I:\Java\mycode\CommonsIO\empty.txt

47 bytes

 1 import java.io.File;
 2 import java.util.Collection;
 3 
 4 import org.apache.commons.io.FileUtils;
 5 import org.apache.commons.io.filefilter.DirectoryFileFilter;
 6 import org.apache.commons.io.filefilter.EmptyFileFilter;
 7 
 8 public class Main {
 9 
10     public static void main(String[] args) {
11         System.out.println(System.getProperty("user.dir") + "\n");
12         
13         Collection<File> files1 = FileUtils.listFiles(new File(System.getProperty("user.dir")), EmptyFileFilter.NOT_EMPTY, DirectoryFileFilter.INSTANCE);
14         for (File file: files1) {
15             System.out.println(file.getAbsolutePath());
16         }
17     }
18 }

I:\Java\mycode\CommonsIO

I:\Java\mycode\CommonsIO\.classpath
I:\Java\mycode\CommonsIO\.project
I:\Java\mycode\CommonsIO\.settings\org.eclipse.jdt.core.prefs
I:\Java\mycode\CommonsIO\bin\com\mk\Main.class
I:\Java\mycode\CommonsIO\lib\commons-io-2.6-sources.jar
I:\Java\mycode\CommonsIO\lib\commons-io-2.6.jar
I:\Java\mycode\CommonsIO\src\com\mk\Main.java

 1 import java.io.File;
 2 import java.util.Collection;
 3 
 4 import org.apache.commons.io.FileUtils;
 5 import org.apache.commons.io.filefilter.DirectoryFileFilter;
 6 import org.apache.commons.io.filefilter.SuffixFileFilter;
 7 
 8 public class Main {
 9 
10     public static void main(String[] args) {
11         System.out.println(System.getProperty("user.dir") + "\n");
12         
13         Collection<File> files1 = FileUtils.listFiles(new File(System.getProperty("user.dir")), new SuffixFileFilter("java"), DirectoryFileFilter.INSTANCE);
14         for (File file: files1) {
15             System.out.println(file.getAbsolutePath());
16         }
17     }
18 }

I:\Java\mycode\CommonsIO

I:\Java\mycode\CommonsIO\src\com\mk\Main.java

 1 import java.io.File;
 2 import java.util.Collection;
 3 
 4 import org.apache.commons.io.FileUtils;
 5 import org.apache.commons.io.filefilter.DirectoryFileFilter;
 6 import org.apache.commons.io.filefilter.FileFilterUtils;
 7 import org.apache.commons.io.filefilter.SuffixFileFilter;
 8 
 9 public class Main {
10 
11     public static void main(String[] args) {
12         System.out.println(System.getProperty("user.dir") + "\n");
13         
14         Collection<File> files1 = FileUtils.listFiles(new File(System.getProperty("user.dir")), FileFilterUtils.or(new SuffixFileFilter("java"), new SuffixFileFilter("class")), DirectoryFileFilter.INSTANCE);
15         for (File file: files1) {
16             System.out.println(file.getAbsolutePath());
17         }
18     }
19 }

I:\Java\mycode\CommonsIO

I:\Java\mycode\CommonsIO\bin\com\mk\Main.class
I:\Java\mycode\CommonsIO\src\com\mk\Main.java