org.apache.commons.io使用實例

1.文件內容拷貝：
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.文件刪除：
File file = new File( ("io/project.properties") );
String display = FileUtils.byteCountToDisplaySize( file.length() );
System.out.println( "project.xml is " + display );
FileUtils.forceDelete(file)

3.讀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));
}

}

本文來自CSDN博客，轉載請標明出處：http://blog.csdn.net/pengchua/archive/2008/01/10/2033917.aspx