Java 字节流与字符流（综合运用：复制文件）

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

public class Demo {
public static void main(String[] args) throws Exception {
long start = System.currentTimeMillis();
File inFile = new File("e:" + File.separator + "Demo" + File.separator + "TEST.txt");
if (!inFile.exists()) {
System.out.println("File is not exists！");
System.exit(1);
}
File outFile = new File("e:" + File.separator + "Demo" + File.separator + "CopyTEST.txt");
if (!outFile.getParentFile().exists()) {
outFile.getParentFile().mkdirs();
}
InputStream in = new FileInputStream(inFile);
OutputStream out = new FileOutputStream(outFile);
byte[] data = new byte[1024];
int temp = 0;
while ((temp = in.read(data)) != -1) {
out.write(data, 0, temp);
}
in.close();
out.close();
long end = System.currentTimeMillis();
System.out.println("Elapsed Time：" + (end - start));
}
}