Struts2实现文件上传功能实例解析
程序员文章站
2024-03-08 13:49:10
一、 搭建struts2环境
在myeclipse下,右击项目->myeclipse->project facets->install apache s...
一、 搭建struts2环境
在myeclipse下,右击项目->myeclipse->project facets->install apache struts2。
如要自己搭建,需下载struts2包,写struts.xml配置文件。
web.xml文件配置如下:
<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>*.action</url-pattern> </filter-mapping>
二、 文件上传
1.前台页面:
上传页面:
<body> <form action="upload.action" method="post" enctype="multipart/form-data"> <input type="file" name="upload"/> <input type="submit" value="提交"/> <br> ${result} </form> </body>
input name属性与后台命名一致。
上传失败页面:
<body> <h2>上传失败</h2> <s:fielderror></s:fielderror> </body>
需:
<%@ taglib uri="/struts-tags" prefix="s"%>
2.后台action
主要属性upload,uploadcontenttype,uploadfilename。
package com.yf.action; import java.io.file; import org.apache.commons.io.fileutils; import org.apache.struts2.servletactioncontext; import com.opensymphony.xwork2.actionsupport; public class uploadaction extends actionsupport{ private file upload; private string uploadcontenttype; private string uploadfilename; private string result; public file getuoload() { return upload; } public void setupload(file upload) { this.upload = upload; } public string getuploadcontenttype() { return uploadcontenttype; } public void setuploadcontenttype(string uploadcontenttype) { this.uploadcontenttype = uploadcontenttype; } public string getuploadfilename() { return uploadfilename; } public void setuploadfilename(string uploadfilename) { this.uploadfilename = uploadfilename; } public string getresult() { return result; } public void setresult(string result) { this.result = result; } @override public string execute() throws exception { string path = servletactioncontext.getservletcontext().getrealpath("/images"); file file = new file(path); if(!file.exists()){ file.mkdir(); } system.out.println(upload); fileutils.copyfile(upload, new file(file,uploadfilename)); result = "上传成功"; return success; } }
3.struts.xml文件配置
配置action及配置拦截器限制上传文件的类型及大小。
<?xml version="1.0" encoding="utf-8" ?> <!doctype struts public "-//apache software foundation//dtd struts configuration 2.1//en" "http://struts.apache.org/dtds/struts-2.1.dtd"> <struts> <constant name="struts.enable.dynamicmethodinvocation" value="false"/> <constant name="struts.devmode" value="true"/> <constant name="struts.multipart.savedir" value="/tmp"/> <constant name="struts.custom.i18n.resources" value="app"></constant> <package name="default" namespace="/" extends="struts-default"> <action name="upload" class="com.yf.action.uploadaction"> <result>/index.jsp</result> <result name="input">/error.jsp</result> <!-- 配置拦截器限制上传文件的类型及大小 --> <interceptor-ref name="fileupload"> <param name="allowedtypes">image/bmp,image/x-png,image/gif,image/jpeg</param> <param name="maximumsize">2m</param> </interceptor-ref> <interceptor-ref name="defaultstack"></interceptor-ref> </action> </package> </struts>
4.新建properties文件
文件上传失败信息显示到前台,处理显示出错信息。
文件内容如下:
struts.messages.error.file.too/large=\u4e0a\u4f20\u6587\u4ef6\u592a\u5927\u4e86\uff01 struts.messages.error.content.type.not.allowed=\u4e0a\u4f20\u6587\u4ef6\u7c7b\u578b\u4e0d\u7b26\uff01
即添加:
name:struts.messages.error.file.too/large
value : 上传文件太大了!
name : struts.messages.error.content.type.not.allowed
value: 上传文件类型不符!
运行结果如下:
选择jpg图片,大小不超过2m,运行后
选择非图片文件:
如需批量上传文件,将后台upload,uploadcontenttype,uploadfilename均改为list,循环读取上传文件保存到硬盘,前台加入input ,name属性一致。
以上所述是小编给大家介绍的struts2实现文件上传功能实例解析,希望对大家有所帮助