org.apache.commons.io使用实例
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;
public
class
FileCopyExample {
public
static
void
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
System.out.println(lines.get(i));
}