JavaWeb Struts文件上传功能实现详解

程序员文章站 2024-03-13 08:51:51

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...

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>

JavaWeb Struts文件上传功能实现详解