一、对于web页面文件上传实现有多种方式，jsp页面的文件上传有多种实现方式，包括JSP自身的smartUpload组件，但是smartUpload组件也逐渐的被放弃了，
取而代之的是Apache开源组件common-fileupload组件，该组件不管是在Spring框架(framework)或者在Struts2中都有用到并且很受欢迎。
二、下面对于改组件的使用介绍一个实例，希望网友能够喜欢 环境：Myeclipse7.5+JDK1.6+common-fileUpload.jar+common-io.jar(两个jar自己download吧，上apache网站) 第一步：在Myeclise中新建web project
第二步：导入依赖的两个apache jar包
三、下面是代码部分，直接上代码
1、新建类UploadServlet,继承自HttpServlet
package com.deppon.test; import java.io.File; import java.io.IOException; import java.util.Iterator; import java.util.List; 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.FileUploadBase; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; public class UploadServlet extends HttpServlet { @SuppressWarnings("deprecation") @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { DiskFileItemFactory factory = new DiskFileItemFactory(); factory.setSizeThreshold(4 * 1024); ServletFileUpload upload = new ServletFileUpload(factory); upload.setSizeMax(1000 * 1024 * 1024); List itemList = null; try { itemList = upload.parseRequest(request); } catch (FileUploadBase.SizeLimitExceededException e) { // 请求数据的size超出了规定的大小. e.printStackTrace(); request.setAttribute("uploadError", "请求数据的size超出了规定的大小"); request.getRequestDispatcher("/uploadError.jsp").forward(request, response); return; } catch (FileUploadBase.InvalidContentTypeException e) { // 无效的请求类型,即请求类型enctype != "multipart/form-data" request.setAttribute("uploadError", "请求类型enctype != multipart/form-data"); request.getRequestDispatcher("/uploadError.jsp").forward(request, response); return; } catch (FileUploadException e) { // 如果都不是以上子异常,则抛出此总的异常,出现此异常原因无法说明. request.setAttribute("uploadError", "上传过程异常，导致其原因可能是磁盘已满或者其它原因"); request.getRequestDispatcher("/uploadError.jsp").forward(request, response); return; } if (itemList != null) { Iterator it = itemList.iterator(); while (it.hasNext()) { FileItem item = (FileItem) it.next(); if (item.isFormField()) { System.out.println(item.getFieldName()); if ("fileName".equals(item.getFieldName())) { request.setAttribute("fileName", item .getString("GB18030")); System.out.println(item.getString("GBK")); } } else { String uploadPath = request.getRealPath("/upload"); String totalName = item.getName(); String name = "temp"; if (totalName != "") { int index = totalName.lastIndexOf("\"); name = totalName.substring(index + 1); System.out.println(name); } else { name = "temp"; } String path = uploadPath + "/" + name; try { item.write(new File(path)); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); request.setAttribute("uploadError", "写入磁盘错误"); request.getRequestDispatcher("/uploadError.jsp") .forward(request, response); return; } } } } else { request.setAttribute("uploadError", "上传数据空"); request.getRequestDispatcher("/uploadError.jsp").forward(request, response); return; } request.getRequestDispatcher("/uploadSuccess.jsp").forward(request, response); }
}
二、配置改servlet，在web.xml中
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <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>UploadServlet</servlet-name> <servlet-class>com.deppon.test.UploadServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>UploadServlet</servlet-name> <url-pattern>/servlet/UploadServlet</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list>
</web-app>
三、新建三个JSP文件，index.jsp,uploadSuccess.jsp,uploadError.jsp
1、index.jsp
<%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%> <!DOCTYPE html PubLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=GB18030"> <title>Insert title here</title> </head> <body> <form action="servlet/UploadServlet" method="post" enctype="multipart/form-data"> 上传文件1： <input type="file" name="fileUpload"> <br> 上传文件2： <input type="file" name="fileUpload1"> <br> 测试表单域: <input type="text" name="fileName"> <br> <input type="submit" value="上传"> </form> </body>
</html>
2、uploadSuccess.jsp
<%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=GB18030"> <title>Insert title here</title> </head> <body> 上传成功 <br> 其中的字段fileName:${fileName} </body>
</html>
3、uploadError.jsp
<%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%> <!DOCTYPE html P LIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=GB18030"> <title>Insert title here</title> </head> <body> ${uploadError} </body> </html> 四、部署到tomcat或者Jboss，都可以 五、启动tomcat或jboss，访问该应用 http://localhost:8080/fileUpload/index.jsp,你会发现惊喜！！
