java简单的文件复制

package test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class CopyFile {
public static void main(String[] args) {

String path="f://test/";
File pathFile=new File(path);
if(!pathFile.exists()&&!pathFile.isDirectory()){
pathFile.mkdirs();
}

File inFile=new File("f://test/test.txt");
File outFile=new File("f://test/copyTest.txt");

try {

if(!inFile.exists()){
inFile.createNewFile();
}
if(!outFile.exists()){
outFile.createNewFile();
}

InputStream is=new FileInputStream(inFile);
OutputStream os=new FileOutputStream(outFile);

byte[] b=new byte[1024];
int len=0;

while((len=is.read(b))!=-1){
os.write(b, 0, len);
}

} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}