I want to upload multiple files to server and get a parameter "testname" in a JSP page . But it always return a null value. I found the cause of error. Because of "enctype="multipart/form-data"". If I remove it from the form, I can get a parameter but I can't upload multiple files to server. How can I do both of them?
lib: http://www.java2s.com/Code/Jar/c/Downloadcosmultipartjar.htm
index.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>JSP Page</title> </head> <body> <form action="UploadServlet" method="post" enctype="multipart/form-data"> <input name="testname" type="text"> <input type="file" id="file" name="file1" accept="image/*" multiple="muliple" required/><br> <input type="submit"/> <br><br> ${requestScope.message} </form> </body> </html> UploadServlet.java
package MyPackage; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.File; import javax.servlet.*; import javax.servlet.http.*; import com.oreilly.servlet.multipart.MultipartParser; import com.oreilly.servlet.multipart.Part; import com.oreilly.servlet.multipart.FilePart; /** * Servlet implementation class UploadServlet */ @WebServlet("/UploadServlet") public class UploadServlet extends HttpServlet { private String fileSavePath; private static final String UPLOAD_DIRECTORY = "Upload"; public void init() { fileSavePath = getServletContext().getRealPath("/") + File.separator + UPLOAD_DIRECTORY;/*save uploaded files to a 'Upload' directory in the web app*/ if (!(new File(fileSavePath)).exists()) { (new File(fileSavePath)).mkdir(); // creates the directory if it does not exist } } @Override public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, java.io.IOException { String testname=request.getParameter("testname"); System.out.print(testname); String resp = ""; int i = 1; resp += "<br>Here is information about uploaded files.<br>"; try { MultipartParser parser = new MultipartParser(request, 1024 * 1024 * 1024); /* file limit size of 1GB*/ Part _part; while ((_part = parser.readNextPart()) != null) { if (_part.isFile()) { FilePart fPart = (FilePart) _part; // get some info about the file String name = fPart.getFileName(); if (name != null) { long fileSize = fPart.writeTo(new File(fileSavePath)); resp += i++ + ". " + fPart.getFilePath() + "[" + fileSize / 1024 + " KB]<br>"; } else { resp = "<br>The user did not upload a file for this part."; } } }// end while } catch (java.io.IOException ioe) { resp = ioe.getMessage(); } request.setAttribute("message", resp); getServletContext().getRequestDispatcher("/index.jsp").forward(request, response); } } 
