Question

我已经使用servlet3.0编写了一个用于上传文件的servlet，它可以很好地上传文件。但我想以客户端上传的格式将文件保存在服务器中。

        Part filePart = request.getPart("chosenFile");

        String filename = new SimpleDateFormat("yyyyMMddhhmmss").format(new Date()).toString();
        System.out.println(filePart.getContentType().split("/")[1]);

        InputStream inputStream =null;
        OutputStream outputStream =null;

        File fileSaveDirectory = new File(UPLOAD_DIR);
        if(!fileSaveDirectory.exists()){
            fileSaveDirectory.mkdir();
        }

        String content_path = UPLOAD_DIR+File.separator+filename;//earlier
        //here I was appending the string ".pdf" to every file
        //but now I want the file type to be the uploaded file type.
        //say if user uploads in .jpeg or any other.

        System.out.println("Content Path : "+content_path);

        outputStream = new FileOutputStream(new File(content_path));
        inputStream = filePart.getInputStream();
        int read=0;

        while((read=inputStream.read())!=-1){
            outputStream.write(read);
        }

        if(outputStream!=null)
            outputStream.close();
        if(inputStream !=null)
            inputStream.close();

如何保留文件类型，上传文件的类型。请帮忙！！！

Answer 1

请参阅@ http://docs.oracle.com/javaee/6/tutorial/doc/glraq.html：

private String getFileName(final Part part) {
    final String partHeader = part.getHeader("content-disposition");
    LOGGER.log(Level.INFO, "Part Header = {0}", partHeader);
    for (String content : part.getHeader("content-disposition").split(";")) {
        if (content.trim().startsWith("filename")) {
            return content.substring(
                    content.indexOf('=') + 1).trim().replace("\"", "");
        }
    }
    return null;
}

因此，当您的（文件上传）请求设置正常/正常时，（http）标头content-disposition将包含; filename <?php class DatabaseTest extends PHPUnit_Framework_TestCase { protected static $dbh; public static function setUpBeforeClass() { self::$dbh = new PDO('sqlite::memory:'); } public static function tearDownAfterClass() { self::$dbh = NULL; } } ?>属性（以及其他内容），您可以使用（在整个或中）提取文件后缀。

java - 如何在servlet 3.0中获取文件类型

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