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在我們的web開發中,很多的時候都需要把本機的一些文件上傳到web服務器上面去。
如:一個BBS系統,當用戶使用這是系統的時候,能把本機的一些圖片,文檔上傳到服務器上面去。然后其他用戶可以去下載這些文件,那么這樣的話,我們可以自己編程實現文件的上傳
但是更好的方式是使用一些已有的組件幫助我們實現這種上傳功能。
常用的上傳組件:
Apache 的 Commons FileUpload
JavaZoom的UploadBean
jspSmartUpload
upload.jsp
代碼;
<%@ page language="java" contentType="text/html; charset=UTF-8"%> <html> <head> <title>using commons Upload to upload file </title> </head> <style> * { font-family: "宋體"; font-size: 14px } </style> <body> <p align="center"> 請您選擇需要上傳的文件</p> <form id="form1" name="form1" method="post" action="servlet/fileServlet" enctype="multipart/form-data"> <table border="0" align="center"> <tr> <td>上傳人:</td> <td> <input name="name" type="text" id="name" size="20" ></td> </tr> <tr> <td>上傳文件:</td> <td><input name="file" type="file" size="20" ></td> </tr> <tr> <td></td><td> <input type="submit" name="submit" value="提交" > <input type="reset" name="reset" value="重置" > </td> </tr> </table> </form> </body> </html>
FileUploadServlet.java代碼:
/** * */ package com.b510.example; import java.io.File; import java.io.IOException; import java.util.*; import javax.servlet.ServletConfig; import javax.servlet.ServletContext; 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; /** * * @author XHW * * @date 2011-7-26 * */ public class FileUploadServlet extends HttpServlet { private static final long serialVersionUID = -7744625344830285257L; private ServletContext sc; private String savePath; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void init(ServletConfig config) { // 在web.xml中設置的一個初始化參數 savePath = config.getInitParameter("savePath"); sc = config.getServletContext(); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); DiskFileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); try { List items = upload.parseRequest(request); Iterator itr = items.iterator(); while (itr.hasNext()) { FileItem item = (FileItem) itr.next(); if (item.isFormField()) { System.out.println("表單參數名:" + item.getFieldName() + ",表單參數值:" + item.getString("UTF-8")); } else { if (item.getName() != null && !item.getName().equals("")) { System.out.println("上傳文件的大小:" + item.getSize()); System.out.println("上傳文件的類型:" + item.getContentType()); // item.getName()返回上傳文件在客戶端的完整路徑名稱 System.out.println("上傳文件的名稱:" + item.getName()); File tempFile = new File(item.getName()); //上傳文件的保存路徑 File file = new File(sc.getRealPath("/") + savePath, tempFile.getName()); item.write(file); request.setAttribute("upload.message", "上傳文件成功!"); }else{ request.setAttribute("upload.message", "沒有選擇上傳文件!"); } } } }catch(FileUploadException e){ e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); request.setAttribute("upload.message", "上傳文件失敗!"); } request.getRequestDispatcher("/uploadResult.jsp").forward(request, response); } }
uploadResult.jsp代碼:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>uploadResult</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" > --> </head> <body> ${requestScope['upload.message'] } <a href="/upload/uploadFile.jsp" rel="external nofollow" >上傳文件</a> </body> </html>
web.xml
<servlet> <description>This is the description of my J2EE component</description> <display-name>This is the display name of my J2EE component</display-name> <servlet-name>FileUploadServlet</servlet-name> <servlet-class>com.b510.example.FileUploadServlet</servlet-class> <!--設置初始化參數--> <init-param> <param-name>savePath</param-name> <param-value>uploads</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>FileUploadServlet</servlet-name> <url-pattern>/servlet/fileServlet</url-pattern> </servlet-mapping>
本文已被整理到了《Java上傳操作技巧匯總》,歡迎大家學習閱讀。
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