org.apache.commons.io使用实例

转自：http://blog.csdn.net/pengchua/article/details/2033917

1.文件内容拷贝：

import java.io.File;

import java.io.FileWriter;

import java.io.IOException;

import java.io.InputStream;

import java.io.Writer;

 

import org.apache.commons.io.FileUtils;

import org.apache.commons.io.IOUtils;

 

 

publicclass FileCopyExample {

    publicstaticvoid main(String[] args) {

       try {

           File src = new File( "test.dat" );

           File dest = new File( "test.dat.bak" );

          

           FileUtils.copyFile( src, dest );

       } catch( IOException ioe ) {

           System.out.println( "Problem copying file." );

       }

      

       try {

           File src = new File( "test.dat" );

           File dir = new File( "./temp" );

 

           FileUtils.copyFileToDirectory( src, dir );

       } catch( IOException ioe ) {

           System.out.println( "Problem copying file to dir.");

       }

      

       try {

           String string = "Blah blah blah";

           File dest = new File( "test.tmp" );

          

           FileUtils.writeStringToFile( dest, string, "ISO-8859-1" );

       } catch( IOException ioe ) {

           System.out.println( "Error writing out a String." );       

       }

      

      

       try {

           Writer writer = new FileWriter( "test.dat" );

           InputStream inputStream =FileCopyExample.class.

              getClass().getResourceAsStream("/io/web.xml");

           IOUtils.copy( inputStream, writer );

           writer.close();

           inputStream.close();

       } catch (IOException e) {

           System.out.println( "Error copying data" );

       }

 

try {

           File src = new File( "test.txt" );

           OutputStream output = new FileOutputStream(src);

           InputStream inputStream =FileCopyExample.class.

              getClass().getResourceAsStream("/io/web.xml");

           IOUtils.copy( inputStream, output );

//         writer.close();

           inputStream.close();

           output.close();

       } catch (IOException e) {

           System.out.println( "Error copying data" );

       }

    }

 

}

 

2.文件删除：

File file = new File( ("io/project.properties") );

       String display = FileUtils.byteCountToDisplaySize( file.length() );

       System.out.println( "project.xml is " + display );

       FileUtils.forceDelete(file)

 

3.读取取文本中的每一行：

import java.io.File;

import java.io.IOException;

import java.util.List;

 

import org.apache.commons.io.FileSystemUtils;

import org.apache.commons.io.FileUtils;

 

 

public class Test {

 

       /**

        * @param args

        * @throws IOException

        */

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

              // TODO Auto-generated method stub

              File file = new File((Test.class.getClass().getResource("/io/web.xml")).getFile());

               List lines = FileUtils.readLines(file, "UTF-8");

               for(int i=0;i<lines.size();i++)

               System.out.println(lines.get(i));

       }

 

}