JavaWeb Struts文件上传功能实现详解

时间：2021-05-19

一.Struts文件上传的思路
之前也讲过了FileUpload这个组件，功能很强大，但是操作繁琐复杂。这次，在Strust中也对文件上传有所支持，并FileUpload进行了包装，用起来方便了许多。
这里涉及到了一个标签和一个类：
<html:file property="对应ActionForm中的属性名称">
用这个标签可以上传文件，但是要接收次内容必须依靠org.apache.struts.upload.FormFile
接口完成。

二.实现
sh.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean"%><%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html"%><%@ taglib uri="http://jakarta.apache.org/struts/tags-logic" prefix="logic"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><title>sh.jsp</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body> <html:form action="/jsp/upload.do" method="post" enctype="multipart/form-data"> <html:file property="photo"></html:file> <html:submit value="上传"></html:submit> </html:form></body></html>

UploadForm.java：

package com.zyy.struts.form;import org.apache.struts.action.ActionForm;import org.apache.struts.upload.FormFile;public class UploadForm extends ActionForm { private FormFile photo; public FormFile getPhoto() { return photo; } public void setPhoto(FormFile photo) { this.photo = photo; }}

IPTimeStamp.java:

package com.zyy.util;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Random;public class IPTimeStamp { private SimpleDateFormat sdf = null; private String ip = null; public IPTimeStamp() { } public IPTimeStamp(String ip) { this.ip = ip; } public String getIPTimeRand() { StringBuffer buf = new StringBuffer(); if (this.ip != null) { String s[] = this.ip.split("\\."); for (int i = 0; i < s.length; i++) { buf.append(this.addZero(s[i], 3)); } } buf.append(this.getTimeStamp()); Random r = new Random(); for (int i = 0; i < 3; i++) { buf.append(r.nextInt(10)); } return buf.toString(); } public String getDate() { this.sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS"); return this.sdf.format(new Date()); } public String getTimeStamp() { this.sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS"); return this.sdf.format(new Date()); } private String addZero(String str, int len) { StringBuffer s = new StringBuffer(); s.append(str); while (s.length() < len) { s.insert(0, "0"); } return s.toString(); } public static void main(String args[]) { System.out.println(new IPTimeStamp("192.168.1.1").getIPTimeRand()); }}

UploadAction.java：

package com.zyy.struts.action;import java.io.File;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;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;import com.zyy.struts.form.UploadForm;import com.zyy.util.IPTimeStamp;public class UploadAction extends Action { public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { UploadForm uploadForm = (UploadForm) form; IPTimeStamp ips = new IPTimeStamp(request.getRemoteAddr()); // 文件名 String fileName = ips.getIPTimeRand() + "." + uploadForm.getPhoto().getFileName().split("\\.")[uploadForm .getPhoto().getFileName().split("\\.").length - 1]; // 输出路径 File outFile = new File(super.getServlet().getServletContext() .getRealPath("/") + "upload" + File.separator + fileName); // 存放图片的文件夹 File file = new File(super.getServlet().getServletContext() .getRealPath("/") + "upload"); if (!file.exists()) { file.mkdir(); } InputStream input = uploadForm.getPhoto().getInputStream(); OutputStream output = new FileOutputStream(outFile); byte data[] = new byte[1024]; int temp = 0; while ((temp = input.read(data, 0, 1024)) != -1) { output.write(data); } output.close(); input.close(); return null; }}

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.zyy.struts.form.UploadForm"></form-bean> </form-beans> <global-exceptions> </global-exceptions> <global-forwards> </global-forwards> <action-mappings> <action path="/jsp/upload" attribute="uploadForm" input="/jsp/sh.jsp" name="uploadForm" scope="request" type="com.zyy.struts.action.UploadAction"> </action> </action-mappings> <message-resources parameter="resource.MessageResources" /></struts-config>


由于我保存在的是super.getServlet().getServletContext().getRealPath("/")+ "upload"
这是虚拟目录的真实路径的upload文件夹下。

由此可见，在Struts中的文件上传原理和FileUpload一样，但是Struts进行了包装，所以用起来明显比单独用FileUpload组件方便了许多。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。

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