JavaWeb Struts文件上传功能实现详解

Z时代
2024-01-10
分类：IT

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>