文件上传处理程序 [英] File Upload handler

问题描述

这是一个文件上传处理程序的代码
这是工作正常在我的服务器，但上传文件后，它只显示文件上传成功

，但我也想显示文件的名称已上传

  import java.io.File; 
 import java.io.IOException; 
 import java.util.List; 
 import javax.servlet.ServletException; 
 import javax.servlet.http.HttpServlet; 
 import javax.servlet.http.HttpServletRequest; 
导入javax.servlet.http.HttpServletResponse; 
 import org.apache.commons.fileupload.FileItem; 
 import org.apache.commons.fileupload.disk.DiskFileItemFactory; 
 import org.apache.commons.fileupload.servlet.ServletFileUpload; 
 
 public class FileUploadHandler extends HttpServlet {
 private final String UPLOAD_DIRECTORY =C：/ uploads; 
 $ b @Override 
保护无效doPost（HttpServletRequest请求，HttpServletResponse响应）
抛出ServletException，IOException {
 
 //只处理其多部分内容
 if（ServletFileUpload.isMultipartContent（request））{
 try {
 List< FileItem> multiparts = new ServletFileUpload（
 new DiskFileItemFactory（））。parseRequest（request）; （FileItem item：multiparts）{
 if（！item.isFormField（））{
 String name = new File（item.getName（））。getName（）返回
 
。 ; 
 item.write（new File（UPLOAD_DIRECTORY + File.separator + name））; 
 
 
 $ b //文件上传成功
 
 request.setAttribute（message，File Uploaded Successfully）; 
} catch（Exception ex）{
 request.setAttribute（message，File Upload Failed due to+ ex）; 
 
 $ b} else {
 request.setAttribute（message，
对不起，这个Servlet只处理文件上传请求）; 
 
 
 request.getRequestDispatcher（/ done.jsp）。forward（request，response）; 
 
 
 
 
 $ b 
解决方案将 item.getName（）存储在一个变量中供以后使用。因为你正在使用一个循环，所以你将不得不跟踪多个文件名。
  String fileNames = ; //保存文件名列表
（FileItem item：multiparts）{
 if（！item.isFormField（））{
 fileNames + = item.getName（）+;; //将文件名添加到字符串
 String name = new File（item.getName（））。getName（）; 
 item.write（new File（UPLOAD_DIRECTORY + File.separator + name））; 
 
 
 
 ..... 
 request.setAttribute（message，File（s）Uploaded Successfully：+ fileNames）; 
  
 
This is a code of File Upload Handler 
This is working Fine on my server but after uploading file it only displays File Uploaded successfully

but i also want to display the name of file which is uploaded 
 import java.io.File;
 import java.io.IOException;
 import java.util.List;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import org.apache.commons.fileupload.FileItem;
 import org.apache.commons.fileupload.disk.DiskFileItemFactory;
 import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class FileUploadHandler extends HttpServlet {
private final String UPLOAD_DIRECTORY = "C:/uploads";

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

    //process only if its multipart content
    if(ServletFileUpload.isMultipartContent(request)){
        try {
            List<FileItem> multiparts = new ServletFileUpload(
                                     new DiskFileItemFactory()).parseRequest(request);

            for(FileItem item : multiparts){
                if(!item.isFormField()){
                    String name = new File(item.getName()).getName();
                    item.write( new File(UPLOAD_DIRECTORY + File.separator + name));
                }
            }

  //File uploaded successfully

           request.setAttribute("message", "File Uploaded Successfully");
        } catch (Exception ex) {
           request.setAttribute("message", "File Upload Failed due to " + ex);
        }          

    }else{
        request.setAttribute("message",
                             "Sorry this Servlet only handles file upload request");
    }

    request.getRequestDispatcher("/done.jsp").forward(request, response);

}

}

解决方案
Store item.getName() in a variable for later use.  Since you are using a loop, you'll have to keep track of multiple filenames if there are any.
   String fileNames = ""; //to keep list of filenames
   for(FileItem item : multiparts){
            if(!item.isFormField()){
                fileNames += item.getName() + "; "; //add filename to string
                String name = new File(item.getName()).getName();
                item.write( new File(UPLOAD_DIRECTORY + File.separator + name));
            }
        }
    .....
    .....
    request.setAttribute("message", "File(s) Uploaded Successfully: " + fileNames );


                        
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