DWR实现无刷新上传

这里需要用到commons-fileupload-1.2.2和commons-io-2.3

This is the web.xml

<?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>dwr-invoker</servlet-name><servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class><!-- 配置debug参数为true后，就可以访问DWR的控制台了，访问地址为http://ip:port/webApp/dwr/ --><!-- 开发阶段可以开启控制台，但在产品交付时，务必关掉控制台 --><init-param><param-name>debug</param-name><param-value>true</param-value></init-param></servlet><servlet-mapping><servlet-name>dwr-invoker</servlet-name><url-pattern>/dwr/*</url-pattern></servlet-mapping></web-app>

This is DWR Config File----dwr.xml

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN""http://getahead.org/dwr/dwr30.dtd"><dwr><allow><create creator="new" javascript="JSUserManager"><param name="class" value="com.jadyer.dwr.UserManager" /></create></allow></dwr>

下面是用于提交上传操作的前台页面upload.jsp

<%@ page language="java" pageEncoding="UTF-8"%><script type="text/javascript" src="<%=request.getContextPath()%>/dwr/interface/JSUserManager.js"></script><script type="text/javascript" src="<%=request.getContextPath()%>/dwr/engine.js"></script><script type="text/javascript" src="<%=request.getContextPath()%>/dwr/util.js"></script><script type="text/javascript">function upload() {var file = dwr.util.getValue("myfile");alert(file.value);//不同浏览器在此处得到的值,不一定相同....IE9得到的是含全路径的文件名,firefox12得到的是文件名alert(file);JSUserManager.upload(file, file.value, function(data){alert(data);});}</script><input type="file" id="myfile"/><input type="button" value="上传文件" onclick="upload()"/>

最后是需要由DWR发布的UserManager.java

package com.jadyer.dwr;import java.io.File;import java.io.IOException;import java.io.InputStream;import javax.servlet.http.HttpServletRequest;import org.apache.commons.io.FileUtils;import org.apache.commons.io.FilenameUtils;import org.directwebremoting.WebContextFactory;public class UserManager {/** * 上传文件 * @param is       DWR会自动把dwr.util.getValue("myfile")转换为这里所需的InputStream * @param filename 不同浏览器传进来的值未必相同，IE9传是含全路径的文件名,firefox12传的是文件名 * @return 文件的真实名字 */public String upload(InputStream is, String filename) throws IOException{String realname = FilenameUtils.getName(filename);                            //获取文件的真实名字HttpServletRequest request = WebContextFactory.get().getHttpServletRequest(); //获取Servlet APIString realpath = request.getSession().getServletContext().getRealPath("/WEB-INF/upload");FileUtils.copyInputStreamToFile(is, new File(realpath, realname));return realname;}}

补充：记得建立//WEB-INF//upload//目录，其用于接收所上传的文件