Java三大框架之struts的上传文件

来源：互联网发布：淘宝联盟的pid是什么编辑：程序博客网时间：2024/05/16 01:08

在没有struts之前，想要用Java上传文件还得写很多复杂的代码，利用servlet3.0的新特性，或者在servlet3.0之前比如借助其他的插件，比如commons-fileupload组件，或者其他的。并且代码写得十分复杂。利用struts框架进行上传文件核心代码只需要几行。但是框架用起来感觉有点复杂的就是搭建这个环境了。

首先应该包含核心jar包。这些文件可以从网上下载。我用到的核心jar包如下：

第二步：struts是基于拦截器实现的。因此需要在web.xml里面配置一个拦截器，把控制权交给struts来处理。

<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>

第三步：在struts.xml文件中写action的配置

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"    "http://struts.apache.org/dtds/struts-2.0.dtd"><struts><package name="fileAction" extends="struts-default" namespace="/"><action name="MyfileUpload" class="com.levi.action.FileUpload"><result name="success">/fileUpload_Success.jsp</result><result name="error">/error.jsp</result><result name="input">/fileUpload.jsp</result></action></package></struts>

第四步前端上传页面代码为:

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%> <%@taglib prefix="s" uri="/struts-tags" %><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><form action="MyfileUpload" method="post" enctype="multipart/form-data"><input type="file" name="fileUpload"/><br><button type="submit">上传</button></form><br>错误信息如下:<s:fielderror></s:fielderror></body></html>

前端上传成功页面如下：

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>    <%@taglib prefix="s" uri="/struts-tags" %><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body>文件上传成功<br>文件名:<s:property value="#session.fileUploadFileName"/><br>文件类型为:<s:property value="#session.fileUploadContentType"/><br></body></html>

最后编写处理Action的类

package com.levi.action;import java.io.File;import java.util.Map;import org.apache.commons.io.FileUtils;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport;public class FileUpload extends ActionSupport{/** *  */private static final long serialVersionUID = 1L;private File fileUpload;private String fileUploadFileName;public File getFileUpload(){return fileUpload;}public void setFileUpload(File fileUpload){this.fileUpload = fileUpload;}public String getFileUploadFileName(){return fileUploadFileName;}public void setFileUploadFileName(String fileUploadFileName){this.fileUploadFileName = fileUploadFileName;}public String getFileUploadContentType(){return fileUploadContentType;}public void setFileUploadContentType(String fileUploadContentType){this.fileUploadContentType = fileUploadContentType;}private String fileUploadContentType;@Overridepublic String execute() throws Exception{ActionContext actionContext=ActionContext.getContext();Map<String, Object> session=actionContext.getSession();session.put("fileUploadFileName", fileUploadFileName);session.put("fileUploadContentType", fileUploadContentType);System.out.println("文件名为:"+fileUploadFileName);System.out.println("文件的类型为:"+fileUploadContentType);String filePath="d:/upload/"+fileUploadFileName;File saveFile=new File(filePath);FileUtils.copyFile(fileUpload, saveFile);return SUCCESS;}}

然后就可以实现上传了。这个绝对简单很多的，只是前面配置有点麻烦。这个只实现了一个单文件的上传，后面可以增加一些配置，比如设定最大文件大小，上传类型等等，下一篇再详细实现

0 0