CoreJava/exp10/CopyFile.java

package exp10;

import java.io.*;

public class CopyFile {
    public static void main(String[] args) {
        String dirPath = "D:/MyProjects/CoreJava/exp10/MultiFile"; //源文件路径
        String dstPath = "C:/test.java"; //目标文件路径
        File dir = new File(dirPath);
        File dst = new File(dstPath);
        File[] files = dir.listFiles();

        try{ //通过三种方式将源文件复制到目标文件中
            charCopy(files[0], dst);
            charArryCopy(files[1], dst);
            bufferCopy(files[2], dst);
        }catch(IOException e){
            System.out.println("程序因为IO异常结束运行!");
        }
        
    }

    //一次一个字节地读写
    public static void charCopy(File src, File dst) throws IOException{
        InputStream in = new FileInputStream(src);
        OutputStream out = new FileOutputStream(dst, true);
        int b;

        while ((b=in.read()) != -1){
            out.write(b);
        }

        in.close();
        out.close();
    }

    //一次一个季节数组地读写
    public static void charArryCopy(File src, File dst) throws IOException{
        InputStream in = new FileInputStream(src);
        OutputStream out = new FileOutputStream(dst, true);
        byte[]  buffer = new byte[1024];
        int size;

        while((size=in.read(buffer)) != -1){
            out.write(buffer, 0, size);;
        }

        in.close();
        out.close();
    }

    //缓冲字节流读写
    public static void bufferCopy(File src, File dst) throws IOException{
        BufferedInputStream in = new BufferedInputStream(new FileInputStream(src));
        BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(dst, true));
        byte[]  buffer = new byte[1024];
        int size;

        while((size=in.read(buffer)) != -1){
            out.write(buffer, 0, size);;
        }
        out.flush();

        in.close();
        out.close();
    }
}