JSP组件commons-fileupload实现文件上传

2020-07-27 21:26:32

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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武林网。

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