import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;/*** IO流的读写拷贝*/
public class Demo1 {public static void main(String[] args) throws IOException {//在D盘建一个文件夹，，创建A文件，写入数据，创建B文件夹，File file = new File("D:A");//创建文件夹Aboolean mkdirs = file.mkdirs();//创建文件demo1.txt并写入数据File demo1 = new File(file, "demo1.txt");//创建demo1.txtboolean newFile = demo1.createNewFile();//向demo1.txt写入数据FileOutputStream out = new FileOutputStream(demo1);out.write("啦啦啦，啦啦啦，我是demo1的卖报的小行家".getBytes());out.close();//创建demo2.txt 并拷贝demo1.txt的内容File demo2 = new File(file, "demo2.txt");//从demo1 拷贝到demo2FileInputStream inputDemo1 = new FileInputStream(demo1);FileOutputStream outputDemo2 = new FileOutputStream(demo2);byte[] arr = new byte[1024];int length;while ((length = inputDemo1.read(arr)) != -1) {outputDemo2.write(arr, 0, length);}inputDemo1.close();outputDemo2.close();}
}