Uploading to implement file uploads, we must first understand the HTTP request to upload the file. The following simple application demonstrates how to upload a file and write the original data of an HTTP request to a file. View the file in a text editor to understand the format of the request, and on that basis we can extract the name of the uploaded file, the contents of the file, and other information that was originally mixed together.
Here we write a simple HTML page up.html that provides a form where users select files from here and upload files to the server.
Select the file to upload <input type= "file" name= "filename"/>
<br/>
<input type= "Submit" value= "Upload"/>
</form>
</body>
Note that the,<form> tag has a enctype attribute, and the property value is "Multipart/form-data". There is also a type file input box is used to select the upload file.
The form's Action property value is upjsp.jsp, which sends the request to the upjsp.jsp file. Upjsp.jsp called the JavaBean named Upbean.
public void Doupload (HttpServletRequest request) throws
IOException {
PrintWriter pw = new PrintWriter (
New BufferedWriter (New FileWriter ("test.txt"));
ServletInputStream in = Request.getinputstream ();
int i = In.read ();
while (I!=-1) {
Pw.print ((char) i);
i = In.read ();
}
Pw.close ();
}
}
This JavaBean writes the HttpServletRequest object's form raw data to the Test.txt file.
Choose to upload a text or a Web page file. After clicking on the "Upload" button, the form is sent to the upjsp.jsp file, together with the uploaded file. The upjsp.jsp file does not send any answers to the browser, but it generates a Test.txt file. Open the Test.txt file, we can see the contents of the uploaded file and some uploaded information.
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