Commons-IO例子一

//直接将IO流转成字符串 InputStream in = new URL( "http://jakarta.apache.org" ).openStream(); try { System.out.println( IOUtils.toString( in ) ); } finally { IOUtils.closeQuietly(in); }//读取文本文件的所有行 File file = new File("/commons/io/project.properties"); List lines = FileUtils.readLines(file, "UTF-8");//路径处理 String filename = "C:/commons/io/../lang/project.xml"; String normalized = FilenameUtils.normalize(filename); // result is "C:/commons/lang/project.xml"//获取目录空间 long freeSpace = FileSystemUtils.freeSpace("C:/"); //打印文件的所有行 LineIterator it = FileUtils.lineIterator(file, "UTF-8"); try { while (it.hasNext()) { String line = it.nextLine(); /// do something with line } } finally { LineIterator.closeQuietly(iterator); }==============================更明细的例子=================


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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));
}

}