[英]how to know how many object type=“file” there are in a jsp
i'm created a form to upload images into a blob field of a mysql database. 我创建了一个表单,用于将图像上传到mysql数据库的blob字段中。
In a servlet i get the imagine inside a type="file" field in a jsp page. 在一个servlet中,我在一个jsp页面的type =“ file”字段中得到了想象。
Part filePart = request.getPart("Name_of_the_FILE_fields");
Now i want to allow user to upload more images at the same time, so i put in my jsp page a lot of type="file" field. 现在,我想允许用户同时上传更多图像,因此我在jsp页面中放置了许多type =“ file”字段。
I thought that i could do something like this 我以为我可以做这样的事情
Part filePart[] =request.getParameterValues("Name_of_the_FILE_fields");
but of course this is not the right way to do it. 但这当然不是正确的方法。
Here's a script that you can use. 这是您可以使用的脚本。
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
String savePath = request.getServletContext().getRealPath("") + File.separator + "files";
File fileSaveDir = new File(savePath);
if (!fileSaveDir.exists()) {
fileSaveDir.mkdir();
}
for (Part part : request.getParts()) {
String fileName = findFileName(part);
part.write(savePath + File.separator + fileName);
}
}
private String findFileName(Part part) {
String[] items = part.getHeader("content-disposition").split(";");
for (String item : items) {
if (item.trim().startsWith("filename")) {
return item.substring(item.indexOf("=") + 2, item.length() - 1);
}
}
return "";
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.