Struts2-檔案上傳-標籤使用
阿新 • • 發佈：2019-01-05
- -開發環境：IDE: Intellij IDEA 2017tomcat:9.0os:archlinuxjdk:1.8.0._131 -
- 新建FileUploadDemo工程
勾選struts2選項
建立完後工程目錄如下：
- 新建包com.action,在包下新建FileUploadAction.java類，內容如下
package com.action; import com.opensymphony.xwork2.ActionSupport; import java.io.File; /** * Created by sky on 7/11/17. */ public class FileUploadAction extends ActionSupport { private File uploadFile;//對應index.jsp裡的<s:file>標籤裡的name的值 不一樣無法獲取 private String uploadFileFileName; private String uploadFileContentType; public void setUploadFile(File uploadFile) { this.uploadFile = uploadFile; } public void setUploadFileFileName(String uploadFileFileName) { this.uploadFileFileName = uploadFileFileName; } public void setUploadFileContentType(String uploadFileContentType) { this.uploadFileContentType = uploadFileContentType; } public File getUploadFile() { return uploadFile; } public String getUploadFileFileName() { return uploadFileFileName; } public String getUploadFileContentType() { return uploadFileContentType; } @Override public String execute() throws Exception { if(uploadFile!=null){ String dataDir="/home/sky/"; File saveFile=new File(dataDir,uploadFileFileName); uploadFile.renameTo(saveFile); } else { return INPUT; } return SUCCESS; } }
- 編輯struts.xml,內容如下：
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"> <struts> <package name="Struts2_AJAX_DEMO" namespace="/" extends="struts-default"> <action name="fileupload" class="com.action.FileUploadAction"> <result>/success.jsp</result> <interceptor-ref name="defaultStack"> <param name="fileUpload.allowedTypes">image/jpg,image/jpeg,image/png</param> </interceptor-ref> </action> </package> </struts>
- WEB-INF 目錄下 web.xml 內容如下：
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1"> <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>
- web目錄下新建index.jsp和sucess.jsp
<%--
Created by IntelliJ IDEA.
User: sky
Date: 7/11/17
Time: 4:18 PM
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
<center>
<s:form action="fileupload" enctype="multipart/form-data" method="POST">
<s:file name="uploadFile" label="選擇檔案"/>
<s:submit/>
</s:form>
</center>
</body>
</html>
sucess.jsp內容如下:
<%@ taglib prefix="s" uri="/struts-tags" %>
<%--
Created by IntelliJ IDEA.
User: sky
Date: 7/11/17
Time: 5:13 PM
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<center>
<h2>
檔名:<s:property value="uploadFileFileName"/><br/>
檔案型別:<s:property value="uploadFileContentType"/>
</h2>
</center>
</body>
</html>- 除錯執行
注意：<s:file>標籤裡的name屬性值務必跟 FileUploadAction類裡的 private File xxx一樣，例如：<s:file>裡的name=pic,<s:file name="pic"> 對應FileUploadAction類裡的 private File 必須為pic,其他２個屬性 檔名和檔案型別 則為picFileName和picContentType，本例中 名為uploadFile。所以 <s:file name="uploadFile">
FileUploadAction類裡3個欄位名為 uploadFile uploadFileFileName uploadFileContentType。