勾选struts2选项
创建完后工程目录如下：
新建包com.action,在包下新建FileUploadAction.java类，内容如下 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;//对应index.jsp里的<s:file>标签里的name的值 不一样无法获取 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; } } 编辑struts.xml,内容如下： <?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 目录下 web.xml 内容如下： <?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目录下新建index.jsp和sucess.jsp index.jsp内容如下: <%-- 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="选择文件"/> <s:submit/> </s:form> </center> </body> </html> sucess.jsp内容如下: <%@ 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> 文件名:<s:property value="uploadFileFileName"/><br/> 文件类型:<s:property value="uploadFileContentType"/> </h2> </center> </body> </html> 调试运行
注意：<s:file>标签里的name属性值务必跟 FileUploadAction类里的 private File xxx一样，例如：<s:file>里的name=pic,<s:file name="pic"> 对应FileUploadAction类里的 private File 必须为pic,其他２个属性 文件名和文件类型 则为picFileName和picContentType，本例中 名为uploadFile。所以 <s:file name="uploadFile">
FileUploadAction类里3个字段名为 uploadFile uploadFileFileName uploadFileContentType。
