struts 2 框架為處理文件上傳提供了內(nèi)置支持，它使用“在 html 中基于表單的文件上傳”。當(dāng)上傳一個(gè)文件時(shí)，它通常會(huì)被存儲(chǔ)在一個(gè)臨時(shí)目錄中，而且它們應(yīng)該由 action 類進(jìn)行處理或移動(dòng)到一個(gè)永久的目錄，用來確保數(shù)據(jù)不丟失。服務(wù)器在恰當(dāng)?shù)奈恢每赡苡幸粋€(gè)安全策略，它會(huì)禁止你寫到除了臨時(shí)目錄以外的目錄，而且這個(gè)目錄屬于你的web應(yīng)用應(yīng)用程序。
通過預(yù)定義的名為文件上傳的攔截器，struts 的文件上傳是可能的，這個(gè)攔截器在 org.apache.struts2.interceptor.fileuploadinterceptor 類是可用的，而且是 defaultstack 的一部分。
創(chuàng)建視圖文件
讓我們開始創(chuàng)建需要瀏覽和上傳選定的文件的視圖。因此，讓我們創(chuàng)建一個(gè)帶有簡(jiǎn)單的 html 上傳表單的 index.jsp，它允許用戶上傳文件：（表單的編碼類型設(shè)置為multipart/form-data）
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<%-- created by intellij idea. user: yzjxiaoyue date: 2017/7/28 time: 19:11 to change this template use file | settings | file templates.--%><%@ 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> <title>file upload</title></head><body><form action="upload" method="post" enctype="multipart/form-data"> <label for="myfile">upload your file</label> <input type="file" name="myfile" id="myfile"/> <input type="submit" value="upload"/></form></body></html> |
之后創(chuàng)建success.jsp頁面：
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<%-- created by intellij idea. user: yzjxiaoyue date: 2017/7/28 time: 19:14 to change this template use file | settings | file templates.--%><%@ page contenttype="text/html; charset=utf-8" %><%@ taglib prefix="s" uri="/struts-tags" %><html><head> <title>file upload success</title></head><body>you have successfully uploaded <s:property value="myfilefilename"/></body></html> |
創(chuàng)建error.jsp頁面
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<%-- created by intellij idea. user: yzjxiaoyue date: 2017/7/28 time: 20:05 to change this template use file | settings | file templates.--%><%@ page contenttype="text/html; charset=utf-8" %><%@ taglib prefix="s" uri="/struts-tags" %><html><head> <title>file upload error</title></head><body>there has been an error in uploading the file.</body></html> |
創(chuàng)建 action 類
接下來讓我們創(chuàng)建一個(gè)稱為 uploadfile.java 的 java 類，它負(fù)責(zé)上傳文件，并且把這個(gè)文件存儲(chǔ)在一個(gè)安全的位置：
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package com.action; import com.opensymphony.xwork2.actionsupport;import org.apache.commons.io.fileutils; import java.io.file;import java.io.ioexception;public class uploadfile extends actionsupport{ private file myfile; public file getmyfile() { return myfile; } public void setmyfile(file myfile) { this.myfile = myfile; } private string myfilecontenttype; private string myfilefilename; private string destpath; public string execute() { /* copy file to a safe location */ destpath = "e:\\program files\\apache-tomcat-9.0.0\\apache-tomcat-9.0.0.m22\\work\\"; try{ system.out.println("src file name: " + myfile); system.out.println("dst file name: " + myfilefilename); file destfile = new file(destpath, myfilefilename); fileutils.copyfile(myfile, destfile); }catch(ioexception e){ e.printstacktrace(); return error; } return success; } public string getmyfilecontenttype() { return myfilecontenttype; } public void setmyfilecontenttype(string myfilecontenttype) { this.myfilecontenttype = myfilecontenttype; } public string getmyfilefilename() { return myfilefilename; } public void setmyfilefilename(string myfilefilename) { this.myfilefilename = myfilefilename; }} |
配置文件
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<?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> <constant name="struts.devmode" value="true"/> <constant name="struts.multipart.maxsize" value="10000000"/> <constant name="struts.multipart.savedir" value="/tmp"/> <constant name="struts.custom.i18n.resources" value="struts"></constant> <package name="default" namespace="/" extends="struts-default"> <action name="upload" class="com.action.uploadfile"> <!--<interceptor-ref name="basicstack"/>--> <interceptor-ref name="defaultstack"/> <interceptor-ref name="fileupload"> <param name="allowedtypes">image/jpeg,image/jpg,image/gif</param> </interceptor-ref> <result name="success">/success.jsp</result> <result name="error">/error.jsp</result> </action> </package></struts> |
界面截圖
以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持服務(wù)器之家。
原文鏈接：https://blog.csdn.net/yzj_xiaoyue/article/details/76284279
