Java 复制文件并改名

//引入包

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

//获取文件目录并复制文件

String url1 = getFullFilePath(D:\\a.txt); //目标文件
String url2 = getFullFilePath(E:\\b.txt); //要赋值的路径及文件名
FileInputStream in = new FileInputStream(new File(url1));
FileOutputStream out = new FileOutputStream(new File(url2));
byte[] buff = new byte[10240]; //限制大小
int n = 0;
while ((n = in.read(buff)) != -1) {
       out.write(buff, 0, n);
}
out.flush();
in.close();
out.close();