小编典典

使用Apache Commons FileUpload

jsp

这只是行不通的。问题是我不知道该怎么办。我无法调试此代码。我想将上传内容存储到临时文件夹“ temp”,然后将其移至“
applets”。请帮忙?显然,正在访问servlet,但是我找不到上载的文件。

表单(使用脚本创建的表单-如果可能导致问题,我将其放在此处):

<%
out.write("<p>Upload a new game:</p>");
                    out.write("<form name=\"uploadForm\" action=\"game.jsp\" "
                    + "method=\"POST\" enctype=\"multipart/form-data\">"
                    + "<input type=\"file\" name=\"uploadSelect\" value=\"\" width=\"20\" />"
                    + "<br><input type=\"submit\" value=\"Submit\" name=\"uploadSubmitButton\" "
                    + "onclick = \"submitToServlet2('UploadGameServlet');\">"        
                    + "</form>");
 %>

哪个调用此javascript:

function submitToServlet2(newAction)
    {
       document.uploadForm.action = newAction;
    }

依次转到servlet(完整的代码,因为可能隐藏了一些重要的元素)

package org.project;

import java.io.*;
import java.util.Iterator;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
// import servlet stuff
import org.apache.commons.fileupload.*;


public class UploadGameServlet extends HttpServlet {

/** 
* Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
    response.setContentType("text/html;charset=UTF-8");

    if (ServletFileUpload.isMultipartContent(request))
    {
        try 
        {
            // Create a factory for disk-based file items
            FileItemFactory factory = new DiskFileItemFactory();

            // Create a new file upload handler
            ServletFileUpload upload = new ServletFileUpload(factory);

            // Parse the request
            List items = upload.parseRequest(request); /* FileItem */

            File repositoryPath = new File("\\temp");
            DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();
            diskFileItemFactory.setRepository(repositoryPath);

            Iterator iter = items.iterator();
            while (iter.hasNext()) 
            {
                FileItem item = (FileItem) iter.next();
                File uploadedFile = new File("\\applets");
                item.write(uploadedFile);
            }            
        }
        catch (FileUploadException ex) 
        {
            Logger.getLogger(UploadGameServlet.class.getName()).log(Level.SEVERE, null, ex);
        }
        catch (Exception ex) 
        {
            Logger.getLogger(UploadGameServlet.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    PrintWriter out = response.getWriter();
    try {
        out.println("<html>");
        out.println("<head>");
        out.println("<title>Servlet UploadGameServlet</title>");  
        out.println("</head>");
        out.println("<body>");
        out.println("<h1>Servlet UploadGameServlet at " + request.getContextPath () + "</h1>");
        out.println("</body>");
        out.println("</html>");
    } finally { 
        out.close();
    }
}

}


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2020-06-08

共1个答案

小编典典

File repositoryPath = new File("\\temp");
File uploadedFile = new File("\\applets");

试图访问这些文件,而无需任何形式的领导或绝对路径,你正在试图写入指定的文件(不是目录)tempapplets当前工作目录下。在应用服务器中,当前工作目录通常是bin文件夹(取决于您使用的应用服务器等)。

一些建议:

  1. 使用绝对路径(最好存储在web.xml或属性文件中)来引用要将文件保存到的目录。
  2. 您必须指定要写入的文件的名称,您可能想为每个请求创建某种随机/唯一名称。
  3. 为自己节省一些击键,并使用成员变量代替所有Logger.getLogger(UploadGameServlet.class.getName())引用!
  4. 添加一些调试,尤其是查看要在何处写入数据- repositoryPath.getAbsolutePath()例如,记录的结果。
2020-06-08