1.上傳組件
①Apache的Commons FileUpload
②JavaZoom的UploadBean
③JspSmartUpload
2.下載Commons的FileUpload組件
地址:http://commons.apache.org/fileupload/
同時還要下載Commons的IO組件
地址:http://commons.apache.org/io/
3.使用執行個體
步驟一：建立檔案上傳的頁面：fileUpload.jsp
注意表單的 enctype 屬性，這個設定很重要，詳情請見：http://www.cnblogs.com/yinger/archive/2011/09/11/2173689.html
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>檔案上傳</title> </head> <body> <form action="<%=request.getContextPath() %>/servlet/FileUploadServlet" method="post" enctype="multipart/form-data" > 上傳人名:<input type="text" name="name" /><br/> 上傳檔案:<input type="file" name="file" /><br/> <input type="submit" name="submit" value="提交" /> </form> </body></html>
步驟二：建立處理檔案上傳的servlet：fileUploadServlet
package com.yinger.servlet;import java.io.File;import java.io.IOException;import java.util.Iterator;import java.util.List;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.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;public class FileUploadServlet extends HttpServlet { private ServletContext sc; private String savePath; private static final long serialVersionUID = 151650843430214502L; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); DiskFileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload servletFileUpload = new ServletFileUpload(factory);//通過工廠產生一個處理檔案上傳的servlet對象 try { List items = servletFileUpload.parseRequest(request);//解析request Iterator iterator = items.iterator(); while (iterator.hasNext()) { FileItem item = (FileItem) iterator.next(); if(item.isFormField()){//表單的參數欄位 System.out.println("表單的參數名稱："+item.getFieldName()+",表單的參數值："+item.getString("UTF-8")); }else { if(item.getName()!=null && !item.getName().equals("")){//一個上傳的檔案 System.out.println("檔案的名稱："+item.getName()); System.out.println("檔案的大小："+item.getSize()); System.out.println("檔案的類型："+item.getContentType()); File tempFile = new File(item.getName());//getName得到的檔案名稱包含了它在用戶端的路徑 File file = new File(sc.getRealPath("/")+savePath,tempFile.getName()); item.write(file);//將上傳的檔案寫入到file中 request.setAttribute("message", "上傳檔案成功！"); }else{ request.setAttribute("message", "沒有選擇上傳檔案！"); } } } } catch (Exception e) { e.printStackTrace(); request.setAttribute("message", "上傳檔案失敗！"); } request.getRequestDispatcher("/fileUploadResult.jsp").forward(request, response);//轉向，輸出結果 } @Override public void init(ServletConfig config) throws ServletException { savePath = config.getInitParameter("savePath"); sc = config.getServletContext(); } }
步驟三：修改web.xml
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web=http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> <display-name></display-name> <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.yinger.servlet.FileUploadServlet</servlet-class> <init-param> <!-- Servlet的初始化參數，配置上傳檔案的儲存路徑，這裡是當前應用的uplods目錄下 --> <param-name>savePath</param-name> <param-value>uploads</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>FileUploadServlet</servlet-name> <url-pattern>/servlet/FileUploadServlet</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list></web-app>
同時在項目的根目錄下建立檔案夾 uploads （可以就在WebRoot中建立）
步驟四：建立顯示上傳結果的頁面：fileUploadResult.jsp
<%@ page language="java" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>檔案上傳</title> </head> <body> <p> ${requestScope['message'] }<br/> </p> </body></html>
效果展示
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