Generally, forms are submitted in ajax mode, so it is troublesome to upload a form with a file. The basic principle is to add a hidden iframe on the page, and then submit the form data except the file through ajax. In the callback function after the form data is submitted successfully, submit the file separately through form, the target of the form that submits the file points to the aforementioned hidden iframe.
Html code
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<Html> <Form action = "upload. jsp" id = "form1" name = "form1" encType = "multipart/form-data" method = "post" target = "hidden_frame"> </Body> <Script type = "text/javascript"> |
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In index.html, the main task is to write a form and iframe, and set the target of the form to the name of iframe. Be sure to set the iframe to invisible, others are normal file upload methods. The refreshed page is the hidden Iframe, but no page is refreshed in index.html. The callback method of js is the callback method. It is used to clear the file upload box and display background information. Note that the method of clearing the file upload box is a bit different from the normal method.
-- Upload. jsp9Dhjsp code
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<% @ Page language = "java" contentType = "text/html; charset = gb2312" %> <% // Upload initialization // Set Upload restrictions // 2. Restrict the total length of uploaded data. // 3. Set the files that can be uploaded (with the extension limit). Only the doc and txt files are allowed. Boolean sign = true; // 4. Set files that are not allowed to be uploaded (restricted by the extension). Do not upload files with the exe, bat, jsp, htm, and html extensions or files without extension extensions. // Upload a file } Catch (Exception e ){ |
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In upload. jsp, you only need to pay attention to the final output format. In fact, the principle is to output a piece of js code to iframe, and then control its parent page in iframe.
OK, now a refreshing page Upload component is ready, do not forget to add the necessary jspSmartUpload. jar package under the WEB-INF/lib.
It should be noted that Iframe is used for upload, and the status bar will be refreshed, because the page in iframe is refreshed, but the external page is that the page you see is not refreshed, so it can be said that it is similar to Ajax Upload.
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