Enctype= "Multipart/form-data", Servlet gets parameters

The HTML Form Enctype property is a MIME encoding that sets the transfer of a form, with a total of three values to choose from:


①application/x-www-form-urlencoded (default value, cannot be used for file uploads)

②multipart/form-data (Specifies that the transmitted data is a binary type, such as a picture, MP3, file)

③text/plain (pure text transmission, send mail, receive will not appear garbled)

uploaddemo.jsp

<%@ page language= "java" import= "java.util.*" pageencoding= "UTF-8"%> <!
DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >
 


Servletuploaddemo.java



Package com.text;
Import java.io.IOException;
Import javax.servlet.ServletException;
Import Javax.servlet.annotation.MultipartConfig;
Import Javax.servlet.annotation.WebServlet;
Import Javax.servlet.http.HttpServlet;
Import Javax.servlet.http.HttpServletRequest;
Import Javax.servlet.http.HttpServletResponse;

Import Javax.servlet.http.Part;
Servlet3.0+ can be mapped using annotation mode instead of web.xml files.
File upload is servlet3.0+ must have. Part: interface. Represents each item in the form. Equivalent to the Fileitem @WebServlet ("/servlet/servletuploaddemo") @MultipartConfig//** plus this annotation, the reflection of the servlet to know that the process is file upload public Class Servletuploaddemo extends HttpServlet {public void doget (HttpServletRequest request, HttpServletResponse Respon SE) throws Servletexception, IOException {//Normal parameters can also be removed as usual (@MultipartConfig not forgotten) String name = RE
        Quest.getparameter ("name");
        String age = request.getparameter (' age ');
Special parameters with part fetch part part = Request.getpart ("file");
System.out.println (name+ "--" +age); SYSTEM.OUT.PRINTLN (parT);
        Get filename String contentdisposition = Part.getheader ("content-disposition"); System.out.println (contentdisposition);//Form-data; Name= "File";
        Filename= "User.sql" int filenameindex = Contentdisposition.indexof ("filename=");

        String filename = contentdisposition.substring (filenameindex+10, Contentdisposition.length ()-1);
    Part.write (Getservletcontext (). Getrealpath ("/files") + "/" +filename); public void DoPost (HttpServletRequest request, httpservletresponse response) throws Servletexception, I
    oexception {doget (request, response);
 }

}