java进行文件上传，带进度条

网上看到别人发过的一个java上传的代码，自己写了个完整的，附带源码

项目环境：jkd7、tomcat7、

jar包：commons-fileupload-1.2.1.jar、commons-io-1.4.jar

项目结构：

<?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>
<servlet-name>AjaxServlet</servlet-name>
<servlet-class>com.sevennight.servlet.AjaxServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>Upload</servlet-name>
<servlet-class>com.sevennight.servlet.Upload</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>AjaxServlet</servlet-name>
<url-pattern>/upload/AjaxServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>Upload</servlet-name>
<url-pattern>/servlet/Upload</url-pattern>
</servlet-mapping>

<welcome-file-list>
<welcome-file>upload.jsp</welcome-file>
</welcome-file-list>
</web-app>

web.xml

源码地址：http://pan.baidu.com/s/1i3JxC5v

效果图: