用Java写一个文件复制的程序,复制各种不同类型的文件,要求源文件与目标文件都用文件对话框打开,用进度条显示复制进度.-Use Java to write a file copy program, copying a variety of different types of documents, requiring the source file and target file with the file dialog box opens, with the copy progress bar

使用IO技术，创建一个目录，然后复制一个文件到该目录内。-IO technology, create a directory, then copy a file to the directory.