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JSP组件commons-fileupload实现文件上传

程序员文章站 2022-06-29 13:23:17
本文实例为大家分享了jsp使用commons-fileupload实现文件上传代码，供大家参考，具体内容如下 1、准备： 将commons-fileupload-1.1...

本文实例为大家分享了jsp使用commons-fileupload实现文件上传代码，供大家参考，具体内容如下

1、准备：

将commons-fileupload-1.1.zip和commons-io-1.1.zip复制到"\web-inf\lib"目录下

2、首先是servlet：fileupload.java

package servlet;

import java.io.file;
import java.io.ioexception;
import java.io.printwriter;
import java.util.*;
import java.util.regex.pattern;
import java.util.regex.matcher;

import javax.servlet.servletexception;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;

import org.apache.commons.fileupload.fileitem;
import org.apache.commons.fileupload.fileuploadexception;
import org.apache.commons.fileupload.disk.diskfileitemfactory;
import org.apache.commons.fileupload.servlet.servletfileupload;

public class fileupload extends httpservlet {
 
 private string uploadpath="e:\\addnetfile\\";//要上传文件的目录
 private file temppath=new file("e:\\tempfile\\");//存放上传的文件的目录
 
 public void doget(httpservletrequest request, httpservletresponse response)
  throws servletexception, ioexception {
 }

 public void dopost(httpservletrequest request, httpservletresponse response)
  throws servletexception, ioexception {
 response.setcontenttype("text/html;charset=gb2312");
 response.setcharacterencoding("gb2312");
 printwriter out=response.getwriter();
 out.println("请求内容的长度为："+request.getcontentlength());
 out.println("请求内容的类型为："+request.getcontenttype());
 
 diskfileitemfactory factory=new diskfileitemfactory();
 factory.setrepository(temppath);
 factory.setsizethreshold(4096);
 
 servletfileupload upload=new servletfileupload(factory);
 upload.setsizemax(1000000);
 list<?> fileitems=null;
 try{
  fileitems=upload.parserequest(request);
  iterator<?> iterator=fileitems.iterator();
  string regex=".+\\\\(.+)$";
  string[] errortype={".exe",".com",".cgi",".asp"};
  pattern p=pattern.compile(regex);
  while(iterator.hasnext()){
  fileitem item=(fileitem) iterator.next();
  if(!item.isformfield()){
   string name=item.getname();
   long size=item.getsize();
   if(name==null||name.equals("")&&size==0)
   continue;
   matcher m=p.matcher(name);
   if(m.find()){
   for(int temp=0;temp<errortype.length;temp++){
    if(m.group(1).endswith(errortype[temp]))
    throw new ioexception(name+":wrong type");
   }
   try{
    item.write(new file(temppath,m.group(1)));
    out.println(name+" "+size+"<br/>");
    out.println("上传成功");
   }catch(exception e){
    out.println("333"+e);
   } 
   }
   else{
   throw new ioexception("fail to upload");
   }
   
  }
  }
 }catch(ioexception e){
  out.println("222"+e);
 }
 catch(fileuploadexception e1){
  e1.printstacktrace();
  out.println("111"+e1);
 }
 }

 public void init() throws servletexception {
 if(!new file(uploadpath).isdirectory())
  new file(uploadpath).mkdir();
 if(!temppath.isdirectory())
  temppath.mkdir();
 }
 
 public void destroy(){
 super.destroy();
 }

}

3、其次是html：uploadfile.html

<!doctype html public "-//w3c//dtd html 4.01 transitional//en">
<html>
 <head>
  <title>uploadfilel.html</title>
 
  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  <meta http-equiv="description" content="this is my page">
  <meta http-equiv="content-type" content="text/html; charset=utf-8">
  
  <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

 </head>
 
 <body>
  <form action="/firstjsp/servlet/fileupload" method="post" enctype="multipart/form-data" name="form1">
  <input type="file" name="file"/>
  <input type="submit" name="submit" value="upload"/>
  </form>
  <form action="/firstjsp/servlet/fileupload" method="post" enctype="multipart/form-data" name="uploadform">
  <table>
  <tr>
   <td>
   文件1：<input type="file" name="x" size="40"/>
   </td>
  </tr>
  <tr>
   <td>
   文件2：<input type="file" name="y" size="40"/>
   </td>
  </tr>
  <tr>
   <td>
   文件3：<input type="file" name="z" size="40"/>
   </td>
  </tr>
  </table>
  <input type="submit" name="upload" value="开始上传"/> 
  </form>
 </body>
</html>

4、最后是配置web.xml

<servlet>
  <description>this is the description of my j2ee component</description>
  <display-name>this is the display name of my j2ee component</display-name>
  <servlet-name>fileupload</servlet-name>
  <servlet-class>servlet.fileupload</servlet-class>
 </servlet>
<servlet-mapping>
  <servlet-name>fileupload</servlet-name>
  <url-pattern>/servlet/fileupload</url-pattern>

首先运行html，servlet处理上传请求

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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