Question

我正在尝试复制android中的文件。我有文件的文件路径。我想将它复制到另一个文件名不同的文件夹。我使用下面的代码，但它没有工作。我的文件是视频文件。我收到错误 -

 File source=new File(filepath);
    File destination=new File(Environment.getExternalStorageDirectory()+ "/testcopy.mp4");
    copyFile(source.getAbsolutePath(),destination.getAbsolutePath());



private void copyFile(String inputPath, String outputPath) {

        InputStream in = null;
        OutputStream out = null;
        try {

            //create output directory if it doesn't exist
            File dir = new File (outputPath);
            if (!dir.exists())
            {
                dir.mkdirs();
            }


            in = new FileInputStream(inputPath );
            out = new FileOutputStream(outputPath);

            byte[] buffer = new byte[1024];
            int read;
            while ((read = in.read(buffer)) != -1) {
                out.write(buffer, 0, read);
            }
            in.close();
            in = null;

            // write the output file (You have now copied the file)
            out.flush();
            out.close();
            out = null;

        }  catch (FileNotFoundException fnfe1) {
            Log.e("tag", fnfe1.getMessage());
        }
        catch (Exception e) {
            Log.e("tag", e.getMessage());
        }

    }

以下是我的代码

@Index

Answer 1

您创建一个名称为＆＃34; /storage/emulated/0/testcopy.mp4"这里

//create output directory if it doesn't exist
File dir = new File (outputPath);
if (!dir.exists())
{
    dir.mkdirs();
}

试试这段代码

//create output directory if it doesn't exist
File dir = (new File (outputPath)).getParentFile();
if (!dir.exists())
{
    dir.mkdirs();
}

Answer 2

它们的主要问题是您正在尝试编写作为目录的文件。要避免此异常，请先创建目录，然后编写文件：

#include <iostream>
using namespace std;

int main() {
int x;
int array[x];
cout << "Enter your numbers: ";
for (int x = 0; x = <char>; ++x) {
cin >> x;
}
cout << x; 
return 0;
}

复制文件并使用不同的文件名保存

2 个答案: