참고 : http://www.yunsobi.com/blog/406
http://blog.naver.com/tyboss?Redirect=Log&logNo=70060667814&from=postView
package test;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.nio.channels.FileChannel;
import org.junit.Test;
public class FileTest {
@Test
public void copyStream() throws Exception {
String sourceFile = "c:/grid.xls";
String targetFile = "c:/grid_out.xls";
FileInputStream fis = null;
FileOutputStream fos = null;
try {
fis = new FileInputStream(sourceFile);
fos = new FileOutputStream(targetFile);
int read = 0;
byte[] buffer = new byte[4096];
while((read = fis.read(buffer)) != -1) {
fos.write(buffer, 0, read);
}
} finally {
if(fos != null) {
fos.close();
}
if(fis != null) {
fis.close();
}
}
}
@Test
public void copyBuffer() throws Exception {
String sourceFile = "c:/grid.xls";
String targetFile = "c:/grid_out.xls";
FileInputStream fis = null;
FileOutputStream fos = null;
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
try {
fis = new FileInputStream(sourceFile);
fos = new FileOutputStream(targetFile);
bis = new BufferedInputStream(fis);
bos = new BufferedOutputStream(fos);
int read = 0;
byte[] buffer = new byte[4096];
while((read = bis.read(buffer)) != -1) {
bos.write(buffer, 0, read);
}
} finally {
if(bos != null) {
bos.close();
}
if(bis != null) {
bis.close();
}
}
}
@SuppressWarnings("resource")
@Test
public void copyNIO() throws Exception {
String sourceFile = "c:/grid.xls";
String targetFile = "c:/grid_out.xls";
FileInputStream fis = null;
FileOutputStream fos = null;
FileChannel inChannel = null;
FileChannel outChannel = null;
try {
fis = new FileInputStream(sourceFile);
fos = new FileOutputStream(targetFile);
inChannel = fis.getChannel();
outChannel = fos.getChannel();
long size = inChannel.size();
inChannel.transferTo(0, size, outChannel);
} finally {
if(outChannel != null) {
outChannel.close();
}
if(inChannel != null) {
inChannel.close();
}
}
}
}
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