标签:blog http io ar os java sp for 文件
首先,我们建立一个web项目,然后导入:commons-fileupload、commons-io这两个jar包,当然还有其它的struts2需要的jar包
其次,我们还是先配置一下struts2的拦截器:web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="3.0" 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_3_0.xsd"> <display-name></display-name> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>文件上传</title> </head> <body> <form action="upload.action" enctype="multipart/form-data" method="post"> 文件:<input type="file" name="image"> <input type="submit" value="上传"> </form> </body> </html>可以看到,我们在上边的form表单中定义的属性:
action:这是要提交到的action目录
enctype=“multipart/form-data":是设置表单的MIME编码。默认情况,编码格式是:application/x-www-form-urlencoded,不能够用于文件上传;当设置为:multipart/form-data,才能够完成的传递文件数据,进行下面的操作。
接下来,我们需要在struts.xml中配置一个action:
<?xml version="1.0" encoding="GBK"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN" "http://struts.apache.org/dtds/struts-2.1.7.dtd"> <!-- 指定Struts 2配置文件的根元素 --> <struts> <constant name="struts.action.extension" value="do,action"/> <constant name="struts.multipart.maxSize" value="10701096" /> <package name="employee" extends="struts-default"> <action name="upload" class="cn.fileupload.FileUploadAction"> <result name="success">/message.jsp</result> </action> </package> </struts>这里的<constant name="struts.multipart.maxSize" value="10701096" />是设置文件最大上传的容量大小,这里设置的是10M
我们还需要建立一个处理请求的逻辑类:
package cn.fileupload; import java.io.File; import org.apache.commons.io.FileUtils; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionContext; import com.opensymphony.xwork2.ActionSupport; public class FileUploadAction extends ActionSupport{ private File image; //获得文件的文件名,格式为:nameFileName,这里格式中的name为jsp页面中的name属性 private String imageFileName; public String getImageFileName() { return imageFileName; } public void setImageFileName(String imageFileName) { this.imageFileName = imageFileName; } public File getImage() { return image; } public void setImage(File image) { this.image = image; } public String addUI(){ return "success"; } public String execute() throws Exception{ //获得要存放图片的绝对路径 String realpath = ServletActionContext.getServletContext().getRealPath("/images"); System.out.println(realpath); //在路径下创建上传的文件 File savefile = new File(new File(realpath),imageFileName); if(image!=null){ if(!savefile.getParentFile().exists()){ //如果路径不存在,则创建一个 savefile.getParentFile().mkdirs(); //把上传的文件保存在路径中 FileUtils.copyFile(image, savefile); ActionContext.getContext().put("message", "上传成功"); } } return "success"; } }
标签:blog http io ar os java sp for 文件
原文地址:http://blog.csdn.net/u010800530/article/details/41050683