如何使用jsp 上传服务器文件夹上的文件

我正在尝试使用servlet / jsp上传一些位于我的服务器上的文件夹上的图像。

下面是我的代码，它在我的本地机器上工作：

import java.io.*; import java.util.*; import javax.servlet.ServletConfig; 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.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.apache.commons.io.output.*; public class UploadServlet extends HttpServlet { private boolean isMultipart; private String filePath; private int maxFileSize = 1000 * 1024; private int maxMemSize = 1000 * 1024; private File file ; public void init( ){ // Get the file location where it would be stored. filePath = getServletContext().getInitParameter("file-upload"); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, java.io.IOException { // Check that we have a file upload request isMultipart = ServletFileUpload.isMultipartContent(request); response.setContentType("text/html"); java.io.PrintWriter out = response.getWriter( ); if( !isMultipart ){ out.println(""); out.println(""); out.println(""); out.println(""); out.println(""); out.println("
No file uploaded
"); out.println(""); out.println(""); return; } DiskFileItemFactory factory = new DiskFileItemFactory(); // maximum size that will be stored in memory factory.setSizeThreshold(maxMemSize); // Location to save data that is larger than maxMemSize. factory.setRepository(new File(" C:/Users/puneet verma/Downloads/")); // Create a new file upload handler ServletFileUpload upload = new ServletFileUpload(factory); // maximum file size to be uploaded. upload.setSizeMax( maxFileSize ); try{ // Parse the request to get file items. List fileItems = upload.parseRequest(request); // Process the uploaded file items Iterator i = fileItems.iterator(); out.println(""); out.println(""); out.println(""); out.println(""); out.println(""); while ( i.hasNext () ) { FileItem fi = (FileItem)i.next(); if ( !fi.isFormField () ) { // Get the uploaded file parameters String fieldName = fi.getFieldName(); String fileName = fi.getName(); String contentType = fi.getContentType(); boolean isInMemory = fi.isInMemory(); long sizeInBytes = fi.getSize(); // Write the file if( fileName.lastIndexOf("\\") >= 0 ){ file = new File( filePath + fileName.substring( fileName.lastIndexOf("\\"))) ; }else{ file = new File( filePath + fileName.substring(fileName.lastIndexOf("\\")+1)) ; } fi.write( file ) ; out.println("Uploaded Filename: " + fileName + "
"); } } out.println(""); out.println(""); }catch(Exception ex) { System.out.println(ex); } } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, java.io.IOException { throw new ServletException("GET method used with " + getClass( ).getName( )+": POST method required."); } } 

现在我的jsp代码，我上传文件：

        
File Upload:
 Select a file to upload: 
 
  
  
   

在我的web.xml文件中，我包含了这样的路径：

   Location to store uploaded file file-upload  C:\Users\puneet verma\Downloads\   

我已经使用了我的服务器路径http://grand-shopping.com/ ，但它根本不在这里工作。

我正在使用的库是：

1. 公地文件上传-1.3.jar
2. 公地IO-2.2.jar

任何人都可以建议我，我需要如何定义我的服务器路径，以便成功上传图像。

Answer 1

下面的代码正在我的实时服务器以及我自己的Lapy中运行。

注意：

请在WebContent中创建数据文件夹并放入任何单个图像或任何文件（jsp或html文件）。

添加jar文件

公地集合-3.1.jar
公地文件上传-1.2.2.jar
公地IO-2.1.jar
共享记录-1.0.4.jar

upload.jsp

  <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>        
 Select file to upload: 

  
   

UploadServlet.java

 package com.servlet; import java.io.File; import java.io.IOException; import java.util.Iterator; 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.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; /** * Servlet implementation class UploadServlet */ public class UploadServlet extends HttpServlet { private static final long serialVersionUID = 1L; private static final String DATA_DIRECTORY = "data"; private static final int MAX_MEMORY_SIZE = 1024 * 1024 * 2; private static final int MAX_REQUEST_SIZE = 1024 * 1024; protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // Check that we have a file upload request boolean isMultipart = ServletFileUpload.isMultipartContent(request); if (!isMultipart) { return; } // Create a factory for disk-based file items DiskFileItemFactory factory = new DiskFileItemFactory(); // Sets the size threshold beyond which files are written directly to // disk. factory.setSizeThreshold(MAX_MEMORY_SIZE); // Sets the directory used to temporarily store files that are larger // than the configured size threshold. We use temporary directory for // java factory.setRepository(new File(System.getProperty("java.io.tmpdir"))); // constructs the folder where uploaded file will be stored String uploadFolder = getServletContext().getRealPath("") + File.separator + DATA_DIRECTORY; // Create a new file upload handler ServletFileUpload upload = new ServletFileUpload(factory); // Set overall request size constraint upload.setSizeMax(MAX_REQUEST_SIZE); try { // Parse the request List items = upload.parseRequest(request); Iterator iter = items.iterator(); while (iter.hasNext()) { FileItem item = (FileItem) iter.next(); if (!item.isFormField()) { String fileName = new File(item.getName()).getName(); String filePath = uploadFolder + File.separator + fileName; File uploadedFile = new File(filePath); System.out.println(filePath); // saves the file to upload directory item.write(uploadedFile); } } // displays done.jsp page after upload finished getServletContext().getRequestDispatcher("/done.jsp").forward( request, response); } catch (FileUploadException ex) { throw new ServletException(ex); } catch (Exception ex) { throw new ServletException(ex); } } } 

web.xml中

    UploadServlet UploadServlet com.servlet.UploadServlet   UploadServlet /UploadServlet  

done.jsp

 <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>        
Your file has been uploaded!
   

Answer 2

 public class FileUploadExample extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { boolean isMultipart = ServletFileUpload.isMultipartContent(request); if (isMultipart) { // Create a factory for disk-based file items FileItemFactory factory = new DiskFileItemFactory(); // Create a new file upload handler ServletFileUpload upload = new ServletFileUpload(factory); try { // Parse the request List items = upload.parseRequest(request); Iterator iterator = items.iterator(); while (iterator.hasNext()) { FileItem item = (FileItem) iterator.next(); if (!item.isFormField()) { String fileName = item.getName(); String root = getServletContext().getRealPath("/"); File path = new File(root + "/uploads"); if (!path.exists()) { boolean status = path.mkdirs(); } File uploadedFile = new File(path + "/" + fileName); System.out.println(uploadedFile.getAbsolutePath()); item.write(uploadedFile); } } } catch (FileUploadException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } } } } 

Answer 3

你无法像这样上传。

 http://grand-shopping.com/<"some folder"> 

您需要一个与您当地完全相同的物理路径

 C:/Users/puneet verma/Downloads/ 

您可以做的是创建服务器工作的本地路径。 因此，您可以存储和检索文件。 如果您从任何网站购买了一些域名，那么将有上传文件的路径。 您将这些变量创建为静态常量，并根据您正在使用的服务器（本地/网站）使用它。

Answer 4

你只能使用绝对路径http://grand-shopping.com/ <“some folder”>不是绝对路径。

您可以使用应用程序内部的路径，也可以使用服务器特定的路径

 windows -> C:/Users/puneet verma/Downloads/ linux -> /opt/Downloads/ 

Answer 5

我发现了类似的问题并找到了解决方案，我发表了关于如何使用JSP上传文件的博客，在该示例中，我使用了绝对路径。 请注意，如果要路由到其他基于URL的位置，可以放置ESB，如WSO2 ESB