How to Upload Multiple files or Image on Server in Java(VVI)

After wasting 2 days  I came to know how to upload multiple files  on server, I searched many times on internet but  did not  get  solution ,now i can take breath  :P its very important code.

i know the value of this code :) this is for updated servlet3

 keep in mind

1.Do not forget to use enctype="multipart/form-data" in form action of jsp

2.Do not forget to use

@MultipartConfig(maxFileSize = 1024 * 1024 * 50, maxRequestSize = 1024 * 1024 * 100)

if you dont use it then you will get Null pointer exception and believe me even after debugging you will not come to know exact reason, :)

Jsp page

<input type="file" name="files1" >

<input type="file" name="files2" >

<input type="file" name="files3" >

Here name of file is different

Now servlet code

import java.io.File;

import java.io.IOException;

import java.io.PrintWriter;

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;

@MultipartConfig(maxFileSize = 1024 * 1024 * 50, maxRequestSize = 1024 * 1024 * 100)

// 5MB,and 100MB

@WebServlet("/Add_admin_user")

public class Add_admin_user extends HttpServlet {

       private static final long serialVersionUID = 1L;

response.setContentType("text/html;charset=UTF-8");

              PrintWriter out = response.getWriter();

// for multiple files upload

              String filesFolder = "/filesFolder/";

here getting exact path of project

              String appPath_for_multileFiles = request.getServletContext()

                           .getRealPath(filesFolder);

              File multifile = new File(appPath_for_multileFiles);

              if (!multifile.exists()) {

                     multifile.mkdir();

              }

See here if you forget to create new folder then it will create folder on server

//for file 1

       Part part1 = request.getPart("files1");

              if (part1 != null) {

                     if (part1.getSize() != 0) {

              String fileName1 = extractgetFileName(part1);

       if (fileName1 != null) {

       part1.write(appPath_for_multileFiles + File.separator

                     + fileName1);

     String filePath1 = appPath_for_multileFiles + File.separator

                                                + fileName1;

       System.out.println("customer filePath1 full path " + filePath1);

                                 

                           }

                     }

              }

//for file 2

Part part2 = request.getPart("files2");

if (part2 != null) {

       if (part2.getSize() != 0) {

              String fileName2 = extractFileName(part2);

       if (fileName2 != null) {

                     part2.write(appPath_for_multileFiles + File.separator

                                                + fileName2);

              String filePath2 = appPath_for_multileFiles + File.separator

                                                + fileName2;

              System.out.println("customer filePath2 full path " + filePath2);

                                 

                           }

                     }

              }

//for file 3

              Part part3 = request.getPart("files3");

              if (part3 != null) {

       if (part3.getSize() != 0) {

String fileName3 = extractFileName(part3);

       if (fileName3 != null) {

              part3.write(appPath_for_multileFiles + File.separator

                                                + fileName3);

       String filePath3 = appPath_for_multileFiles + File.separator

                                                + fileName3;

System.out.println("customer filePath3 full path " + filePath3);

                                 

                           }

                     }

              }

private String extractgetFileName(Part part) {

              String contentDisp = part.getHeader("content-disposition");

              String[] items = contentDisp.split(";");

              for (String s : items) {

                     if (s.trim().startsWith("filename")) {

                           return s.substring(s.indexOf("=") + 2, s.length() - 1);

                     }

              }

              return "";

       }

if any query then put your questions in comment box.

Thanks

Happy Keep Learning