本文是《Struts2权威指南》的学习笔记，主要讲解如何使用Struts2的fileUpload拦截器进行文件上传操作。在上传过程中，会详细阐述如何配置Struts.xml以启用defaultStack拦截器，并设定文件大小和类型的限制。同时，文章还介绍了资源文件中关于错误提示的定制，例如文件类型不正确和文件大小超出限制的错误消息。
上传页面：
<%...@ page language="java" contentType="text/html; charset=GBK"%><%...@taglib prefix="s" uri="/struts-tags"%><%...@ page isELIgnored="false" %><%...@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<head><meta http-equiv="Content-Type" content="text/html; charset=GBK" /><title></title></head><body><s:fielderror/><form action="upload.action" method="post" enctype="multipart/form-data"> <input type="text" name="title" /><br> <input type="file" name="upload" /><br> <input value="upload" type="submit" /></form></body></html>上传action:
package lee;import com.opensymphony.xwork2.Action;import com.opensymphony.xwork2.ActionContext;import org.apache.struts2.ServletActionContext;import java.io.*;import com.opensymphony.xwork2.ActionSupport;public class UploadAction extends ActionSupport...{
private String title; private File upload; private String uploadContentType; private String uploadFileName; //接受依赖注入的属性 private String savePath; //接受依赖注入的方法 public void setSavePath(String value)
...{ this.savePath = value;
} private String getSavePath() throws Exception ...{ return ServletActionContext.getRequest().getRealPath(savePath); } public void setTitle(String title) ...{ this.title = title; } public void setUpload(File upload) ...{ this.upload = upload; } public void setUploadContentType(String uploadContentType) ...{ this.uploadContentType = uploadContentType; } public void setUploadFileName(String uploadFileName) ...{ this.uploadFileName = uploadFileName; } public String getTitle() ...{ return (this.title); } public File getUpload() ...{ return (this.upload); } public String getUploadContentType() ...{ return (this.uploadContentType); } public String getUploadFileName() ...{ return (this.uploadFileName); } @Override public String execute() throws Exception ...{ System.out.println("开始上传单个文件-----------------------"); System.out.println(getSavePath()); System.out.println("==========" + getUploadFileName()); System.out.println("==========" + getUploadContentType()); System.out.println("==========" + getUpload()); //以服务器的文件保存地址和原文件名建立上传文件输出流 FileOutputStream fos = new FileOutputStream(getSavePath() + "/" + getUploadFileName()); FileInputStream fis = new FileInputStream(getUpload()); byte[] buffer = new byte[1024]; int len = 0; while ((len = fis.read(buffer)) > 0) ...{ fos.write(buffer , 0 , len); } return SUCCESS; } 
}
struts.xml
<?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> <constant name="struts.custom.i18n.resources" value="globalMessages"/> <constant name="struts.i18n.encoding" value="GBK"/> <package name="lee" extends="struts-default"> <action name="upload" class="lee.UploadAction"> <interceptor-ref name="fileUpload"> <param name="allowedTypes">image/bmp,image/png,image/gif,image/jpeg,image/jpg</param> <param name="maximumSize">2000</param> </interceptor-ref> <interceptor-ref name="defaultStack"/> <param name="savePath">/upload</param> <result>/succ.jsp</result> <result name="input">/upload.jsp</result> </action> </package></struts>
如果需要使用文件上传拦截器来过滤文件大小，或者过滤文件内容，则必须显示配置引用Struts默认的拦截器栈：defaultStack
资源文件中配置文件类型不正确和大小不正确的提示：
struts.messages.error.content.type.not.allowed = 文件类型不正确
struts.messages.error.file.too.large= 文件大小不正确
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