Struts2实现文件上传功能实例解析

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,如果大家有任何疑问欢迎给我留言,小编会及时回复大家的!

以上是 Struts2实现文件上传功能实例解析 的全部内容, 来源链接: utcz.com/p/211046.html

回到顶部