Commons_IO_FileUtils的使用

commos_io.jar包下载地址：http://commons.apache.org/proper/commons-io/download_io.cgi

官方文档地址：http://commons.apache.org/proper/commons-io/javadocs/api-release/index.html

//文件、目录遍历 

1 package commosIO;

 import java.io.File;

 import java.util.Collection;

 import org.apache.commons.io.FileUtils;

 import org.apache.commons.io.filefilter.DirectoryFileFilter;

 import org.apache.commons.io.filefilter.EmptyFileFilter;

 import org.apache.commons.io.filefilter.FileFilterUtils;

 import org.apache.commons.io.filefilter.SuffixFileFilter;

 public class CommosIOTest1 {

     public static void main(String[] args) {

         //文件或目录的大小

         long len = FileUtils.sizeOf(new File("src/commosIO/CommosIOTest1.java"));

         long len2 = FileUtils.sizeOf(new File("F:/EclipseWorkspace/Java300"));

         System.out.println(len);

         System.out.println(len2);

         System.out.println("-----------------------------");

         //列出目录下的文件  具体查看api文档

         Collection<File> c = FileUtils.listFiles(new File("F:/EclipseWorkspace/Java300"),

                 EmptyFileFilter.NOT_EMPTY,DirectoryFileFilter.INSTANCE);

         for(File temp:c) {

             System.out.println(temp.getAbsolutePath());

         }

         //只列出后缀为java的文件  文件过滤

         System.out.println("-----------------------------");

         Collection<File> c2 = FileUtils.listFiles(new File("F:/EclipseWorkspace/Java300"),

                 new SuffixFileFilter(".java"),DirectoryFileFilter.INSTANCE);

         for(File temp:c2) {

             System.out.println(temp.getAbsolutePath());

         }

         System.out.println("-----------------------------");

         Collection<File> c3 = FileUtils.listFiles(new File("F:/EclipseWorkspace/Java300"),

                 FileFilterUtils.or(new SuffixFileFilter(".java"),new SuffixFileFilter(".txt")),

                     DirectoryFileFilter.INSTANCE);

         for(File temp:c3) {

             System.out.println(temp.getAbsolutePath());

         }

     }

 }

输出：

1659

6089568

-----------------------------

F:\EclipseWorkspace\Java300\.classpath

F:\EclipseWorkspace\Java300\.project

F:\EclipseWorkspace\Java300\.settings\org.eclipse.jdt.core.prefs

F:\EclipseWorkspace\Java300\a-coyp.jpg

F:\EclipseWorkspace\Java300\a.jpg

F:\EclipseWorkspace\Java300\b.jpg

F:\EclipseWorkspace\Java300\bin\commosIO\CommosIOTest1.class

F:\EclipseWorkspace\Java300\bin\commosIO\CommosIOTest2.class

F:\EclipseWorkspace\Java300\bin\commosIO\CommosIOTest3.class

F:\EclipseWorkspace\Java300\bin\ioStudy\Coffee.class

F:\EclipseWorkspace\Java300\bin\ioStudy\Copy.class

F:\EclipseWorkspace\Java300\bin\ioStudy\Decorate.class

F:\EclipseWorkspace\Java300\bin\ioStudy\DecorateStudy1.class

F:\EclipseWorkspace\Java300\bin\ioStudy\DirStudy.class

F:\EclipseWorkspace\Java300\bin\ioStudy\Drink.class

F:\EclipseWorkspace\Java300\bin\ioStudy\IOstudy1.class

F:\EclipseWorkspace\Java300\bin\ioStudy\IOstudy2.class

F:\EclipseWorkspace\Java300\bin\ioStudy\IOstudy3.class

F:\EclipseWorkspace\Java300\bin\ioStudy\IOstudy4.class

F:\EclipseWorkspace\Java300\bin\ioStudy\IOstudy5.class

F:\EclipseWorkspace\Java300\bin\ioStudy\IOstudy6.class

F:\EclipseWorkspace\Java300\bin\ioStudy\IOstudy7.class

F:\EclipseWorkspace\Java300\bin\ioStudy\Milk.class

F:\EclipseWorkspace\Java300\bin\ioStudy\Sugar.class

F:\EclipseWorkspace\Java300\bin\test\stringTest\ArrayCopy1.class

F:\EclipseWorkspace\Java300\bin\test\stringTest\MyArrayList.class

F:\EclipseWorkspace\Java300\bin\test\stringTest\MyHashMap.class

F:\EclipseWorkspace\Java300\bin\test\stringTest\Node.class

F:\EclipseWorkspace\Java300\bin\test\stringTest\TestBubbleSort.class

F:\EclipseWorkspace\Java300\bin\test\stringTest\TestCollection.class

F:\EclipseWorkspace\Java300\bin\test\stringTest\TestString.class

F:\EclipseWorkspace\Java300\commons-io-2.6-sources.jar

F:\EclipseWorkspace\Java300\commons-io-2.6.jar

F:\EclipseWorkspace\Java300\order.txt

F:\EclipseWorkspace\Java300\output.txt

F:\EclipseWorkspace\Java300\src\commosIO\CommosIOTest1.java

F:\EclipseWorkspace\Java300\src\commosIO\CommosIOTest2.java

F:\EclipseWorkspace\Java300\src\commosIO\CommosIOTest3.java

F:\EclipseWorkspace\Java300\src\ioStudy\Copy.java

F:\EclipseWorkspace\Java300\src\ioStudy\DecorateStudy1.java

F:\EclipseWorkspace\Java300\src\ioStudy\DirStudy.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy1.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy2.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy3.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy4.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy5.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy6.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy7.java

F:\EclipseWorkspace\Java300\src\test\stringTest\ArrayCopy1.java

F:\EclipseWorkspace\Java300\src\test\stringTest\MyArrayList.java

F:\EclipseWorkspace\Java300\src\test\stringTest\MyHashMap.java

F:\EclipseWorkspace\Java300\src\test\stringTest\TestBubbleSort.java

F:\EclipseWorkspace\Java300\src\test\stringTest\TestCollection.java

F:\EclipseWorkspace\Java300\src\test\stringTest\TestString.java

F:\EclipseWorkspace\Java300\temp\a.jpg

F:\EclipseWorkspace\Java300\test.txt

F:\EclipseWorkspace\Java300\testcopy.txt

-----------------------------

F:\EclipseWorkspace\Java300\src\commosIO\CommosIOTest1.java

F:\EclipseWorkspace\Java300\src\commosIO\CommosIOTest2.java

F:\EclipseWorkspace\Java300\src\commosIO\CommosIOTest3.java

F:\EclipseWorkspace\Java300\src\ioStudy\Copy.java

F:\EclipseWorkspace\Java300\src\ioStudy\DecorateStudy1.java

F:\EclipseWorkspace\Java300\src\ioStudy\DirStudy.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy1.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy2.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy3.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy4.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy5.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy6.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy7.java

F:\EclipseWorkspace\Java300\src\test\stringTest\ArrayCopy1.java

F:\EclipseWorkspace\Java300\src\test\stringTest\MyArrayList.java

F:\EclipseWorkspace\Java300\src\test\stringTest\MyHashMap.java

F:\EclipseWorkspace\Java300\src\test\stringTest\TestBubbleSort.java

F:\EclipseWorkspace\Java300\src\test\stringTest\TestCollection.java

F:\EclipseWorkspace\Java300\src\test\stringTest\TestString.java

-----------------------------

F:\EclipseWorkspace\Java300\order.txt

F:\EclipseWorkspace\Java300\output.txt

F:\EclipseWorkspace\Java300\src\commosIO\CommosIOTest1.java

F:\EclipseWorkspace\Java300\src\commosIO\CommosIOTest2.java

F:\EclipseWorkspace\Java300\src\commosIO\CommosIOTest3.java

F:\EclipseWorkspace\Java300\src\ioStudy\Copy.java

F:\EclipseWorkspace\Java300\src\ioStudy\DecorateStudy1.java

F:\EclipseWorkspace\Java300\src\ioStudy\DirStudy.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy1.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy2.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy3.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy4.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy5.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy6.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy7.java

F:\EclipseWorkspace\Java300\src\test\stringTest\ArrayCopy1.java

F:\EclipseWorkspace\Java300\src\test\stringTest\MyArrayList.java

F:\EclipseWorkspace\Java300\src\test\stringTest\MyHashMap.java

F:\EclipseWorkspace\Java300\src\test\stringTest\TestBubbleSort.java

F:\EclipseWorkspace\Java300\src\test\stringTest\TestCollection.java

F:\EclipseWorkspace\Java300\src\test\stringTest\TestString.java

F:\EclipseWorkspace\Java300\test.txt

F:\EclipseWorkspace\Java300\testcopy.txt

文件读写

 1 package commosIO;

 import java.io.File;

 import java.io.IOException;

 import java.util.List;

 import org.apache.commons.io.FileUtils;

 public class CommosIOTest2 {

     public static void main(String[] args) throws IOException {

         //读取文件

         String s = FileUtils.readFileToString(new File("output.txt") , "GBK");

         System.out.println(s);

         System.out.println("-----------------");

         byte[] datas = FileUtils.readFileToByteArray(new File("output.txt"));

         System.out.println(datas.length);

         System.out.println("-----------------");

         //逐行读取

         List<String> list = FileUtils.readLines(new File("output.txt"),"GBK");

         for(String temp:list) {

             System.out.println(temp);

         }

         System.out.println("-----------------");

         //写文件  追加

         FileUtils.write(new File("output.txt"), "锄禾日当午\r\n","GBK");

         FileUtils.write(new File("output.txt"), "汗滴禾下土","GBK",true);

     }

 }

输出：

锄禾日当午

汗滴禾下土

-----------------

22

-----------------

锄禾日当午

汗滴禾下土

-----------------

文件拷贝

 1 package commosIO;

 import java.io.File;

 import java.io.IOException;

 import java.net.URL;

 import org.apache.commons.io.FileUtils;

 import org.apache.commons.io.IOUtils;

 public class CommosIOTest3 {

     public static void main(String[] args) throws IOException {

         //复制文件

         FileUtils.copyFile(new File("a.jpg"), new File("a-coyp.jpg"));

         //复制文件到目录

         FileUtils.copyFileToDirectory(new File("a.jpg"), new File("temp"));

         //复制目录到目录

         //复制目录等  查看文档  大同小异

         //拷贝url内容

         FileUtils.copyURLToFile(new URL("http://www.baidu.com"), new File("order.txt"));

         String datas = IOUtils.toString(new URL("http://www.baidu.com"),"UTF-8");

         System.out.println(datas);

     }

 }

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