Struts1实现文件上传

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引言

         学习了框架之后,就要进行小例子的应用了……下面小编就敲了一个文件上传的例子,还请大家指教!


主要步骤

1、创建用于文件上传的jsp相关页面

1)index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%><%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>    <base href="<%=basePath%>">        <title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head>    <body>   <li>测试strust文件上传</li>  <form action="upload.do" method="post" enctype="multipart/form-data">  标题:<input type="text" name="title"><br>  文件:<input type="file" name="myfile"><br>  <input type="submit" value="提交">  </form>   </body></html>

2)upload_success.jsp

<%@ page language="java" contentType="text/html; charset=GB18030"    pageEncoding="GB18030"%><!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=GB18030"><title>Insert title here</title></head><body>文件上传成功!<br>标题=【${uploadForm.title }】<br>文件名称=【${uploadForm.myfile.fileName }】<br></body></html>

2、创建ActionForm

UploadActionForm

package com.bjpowernode.struts;import org.apache.struts.action.ActionForm;import org.apache.struts.upload.FormFile;@SuppressWarnings("serial")public class UploadActionForm extends ActionForm {private String title;//上传的文件必须采用FormFile声明private FormFile myfile;public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public FormFile getMyfile() {return myfile;}public void setMyfile(FormFile myfile) {this.myfile = myfile;}}

3、创建Action

UploadTestAction

package com.bjpowernode.struts;import java.io.FileOutputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.struts.action.Action;import org.apache.struts.action.ActionForm;import org.apache.struts.action.ActionForward;import org.apache.struts.action.ActionMapping;/** * 上传Action * @author Administrator * */public class UploadTestAction extends Action {@Overridepublic ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)throws Exception {UploadActionForm uaf = (UploadActionForm)form;System.out.println("title=" + uaf.getTitle());System.out.println("fileName=" + uaf.getMyfile().getFileName());FileOutputStream fos = new FileOutputStream("c:\\" + uaf.getMyfile().getFileName());fos.write(uaf.getMyfile().getFileData());fos.flush();fos.close();return mapping.findForward("success");}}

4、配置

struts-config.xml

<?xml version="1.0" encoding="ISO-8859-1" ?><!DOCTYPE struts-config PUBLIC          "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"          "http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd"><struts-config><form-beans><form-bean name="uploadForm" type="com.bjpowernode.struts.UploadActionForm"/></form-beans><action-mappings><action path="/upload"type="com.bjpowernode.struts.UploadTestAction"name="uploadForm"scope="request"><forward name="success" path="/upload_success.jsp"/></action></action-mappings><controller maxFileSize="10M"/></struts-config>

 效果


 


总结

       1、在Struts中,一个FormFile类型的对象对应Form表单中传送的一个文件,Struts将上传的文件信息封装进FormFile中,通过FormFile提供的方法可以方便的进行文件的操作。其实FormFile是一个接口,位于 org.apache.struts.upload.FormFile 中,它定义了操作上传文件的基本方法。

       FormFile接口定义的常用方法:

       (1) getFileName()/setFileName()   //用于获取或设置文件名;

       (2) getFileSize() / setFileSize()      //用于获取或设置文件字节数;

       (3) getFileData()                           //用于获取文件的字节数组,用于小的文件;

       (4) getInputStream()                    //用于获取文件的输入流,用于较大的文件;

       (5) destory()                                 //销毁FromFile;


      2、配置文件中限制文件大小

     <controller maxFileSize="10M"/>

 

      3、 注意:操作struts-config.xml文件时应当特别注意各个节点间的顺序,因为Struts要求配置文件的各个元素顺序有一定的要求,顺序一旦被打乱,也就意味着web容器即将进入瘫痪状态,因此在添加<controler>节点时,要将此节点添加在<action-mapping>和<message-resources>节点之间。

         上传文件Demo已经做完了,期待小编的下次分享吧~~~~

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