FileInputStream和FileOutputStream之拒绝访问

问题遇到的现象和发生背景

Java io 流 之FileInputStream和FileOutputStream的文件夹内容传输，批量传输之拒绝访问

问题相关代码，请勿粘贴截图

        FileInputStream in= new FileInputStream("D://img");
        FileOutputStream out = new FileOutputStream("D://img2");
        int c=-1;
        while ((c=in.read())!=-1){
            out.write(c);
            out.flush();
        }
        in.close();
        out.close();
    }

运行结果及报错内容

"C:\Program Files\Java\jdk1.8.0_261\bin\java.exe" "-javaagent:D:\IDEA软件\IntelliJ IDEA 2021.1\lib\idea_rt.jar=57421:D:\IDEA软件\IntelliJ IDEA 2021.1\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_261\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\rt.jar;E:\idae作业\10\java_base\out\production\java_base" cn.hp.io.Demo01
Exception in thread "main" java.io.FileNotFoundException: D:\img (拒绝访问。)
at java.io.FileInputStream.open0(Native Method)
at java.io.FileInputStream.open(FileInputStream.java:195)
at java.io.FileInputStream.(FileInputStream.java:138)
at java.io.FileInputStream.(FileInputStream.java:93)
at cn.hp.io.Demo01.main(Demo01.java:8)

我的解答思路和尝试过的方法

io流可以批量输入和输出，用listfiles先将FileInputStream里边的每一个具体路径转换为字符串，然后用FileOutputStream调用这个具体路径就可以了

最后解决了问题

File file = new File("D://img");
    File[] files = file.listFiles();
    for (int i = 0; i < files.length; i++) {
        FileInputStream in= new FileInputStream(files[i]);
        File file1 = new File("D://img2");
        FileOutputStream out = new FileOutputStream(file1+"//"+files[i].getName());
        int c=-1;
        while ((c=in.read())!=-1){
            out.write(c);
            out.flush();
        }
        in.close();
        out.close();
    }

这样试试

File file = new File("D://img");
        File file1 = new File("D://img2");
        file1.mkdir();
        File[] files = file.listFiles();
        for (int i = 0; i < files.length; i++) {
            FileInputStream in= new FileInputStream(files[i]);
            FileOutputStream out = new FileOutputStream(file1+"//"+files[i].getName());
            int c=-1;
            while ((c=in.read())!=-1){
                out.write(c);
                out.flush();
            }
            in.close();
            out.close();
        }

D:/img是个什么玩意，怎么连扩展名都没有？

你确定有这个文件？你确定你有这个文件的权限？
要输入的是文件的全路径，img怎么听也不像是一个文件啊。
文件得是1.txt，2.jpg这样之类的吧。
你开看见后缀名了么？
文件管理器，查看下拉，点击展示后缀名