JSP组件commons-fileupload实现文件上传

时间：2021-05-26

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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