java jakata commons上传

最新推荐文章于 2024-03-25 22:39:46 发布

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最新推荐文章于 2024-03-25 22:39:46 发布

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分类专栏： j2EE 文章标签： Java Servlet Apache ASP JSP

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本文介绍了一个使用Java实现的文件上传处理程序，通过Servlet和Apache Commons FileUpload库来处理HTTP请求中的文件上传。该程序设置了文件大小限制、临时存储路径，并通过正则表达式筛选文件类型。

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upload.java


import java.io.File;

import java.io.IOException;

import java.io.PrintWriter;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Iterator;

import java.util.List;

import java.util.regex.Matcher;

import java.util.regex.Pattern;



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 Upload extends HttpServlet {


     private static final long serialVersionUID = 1L;



     public void doPost(HttpServletRequest request, HttpServletResponse response)

              throws ServletException, IOException {

    	 //    	解决中文乱码

    	 String encoding="utf-8";

    	 request.setCharacterEncoding(encoding); 

         response.setContentType("text/html; charset=utf-8");

         PrintWriter out = response.getWriter();

         try {

              DiskFileItemFactory factory = new DiskFileItemFactory(); 

              ServletFileUpload sevletFileUpload = new ServletFileUpload(factory);

              // 设置允许用户上传文件大小,单位:字节，这里设为2m

              sevletFileUpload.setSizeMax(2 * 1024 * 1024 * 100);

              // 设置最多只允许在内存中存储的数据,单位:字节

              factory.setSizeThreshold(4096);

              // 设置一旦文件大小超过getSizeThreshold()的值时数据存放在硬盘的目录

              factory.setRepository(new File("d:\\upload\\temp"));

              // 开始读取上传信息 

              List fileItems = sevletFileUpload.parseRequest(request);

              // 依次处理每个上传的文件

              Iterator iter = fileItems.iterator(); 

              // 正则匹配，过滤路径取文件名

              String regExp = ".+\\\\(.+)$";

              //上传的路径

              String path="D:\\upload\\";

              // 过滤掉的文件类型

              String[] errorType = { ".exe", ".com", ".cgi", ".asp",".class" };

             String[] accessType={".rar",".txt"};

              Pattern p = Pattern.compile(regExp);

              while (iter.hasNext()) {

                   FileItem item = (FileItem) iter.next();

                   // 忽略其他不是文件域的所有表单信息

                   if (!item.isFormField()) {


                       String name = item.getName();

                       long size = item.getSize();

                       double mSize=size/(1024);

                       if ((name == null || name.equals("")) && size == 0)

                            continue;

                       Matcher m = p.matcher(name);

                       boolean result = m.find();

                       if (result) {

                    	   for (int temp = 0; temp < errorType.length; temp++) {

                               if (m.group(1).endsWith(errorType[temp])) {

                                   throw new IOException(name + ": 非法文件类型禁止上传");

                               }

                          }

//                            for (int temp = 0; temp < accessType.length; temp++) {
//
//                                 if (!m.group(1).endsWith(accessType[temp])) {
//
//                                     throw new IOException(name + ": 非法文件类型禁止上传");
//
//                                 }
//
//                            }

                            try {

                                 // 保存上传的文件到指定的目录

                            	item.write(new File(path+ m.group(1))); 

                                 // 在下文中上传文件至数据库时，将对这里改写开始



                            	String str=m.group(1);

                            	int start=str.lastIndexOf(".")+1;

                            	int end=str.length();

                            	String fileName=str.substring(0,start-1);

                            	String type=m.group(1).substring(start, end);

                            	Date date=new Date();

                            	Calendar calendar=new GregorianCalendar();

                            	String printDate=calendar.get(calendar.YEAR)+"年";

                            	printDate+=(calendar.get(calendar.MONTH)+1)+"月";

                            	printDate+=calendar.get(calendar.DAY_OF_MONTH)+"日";

                            	SimpleDateFormat simpleDateFormat=new SimpleDateFormat("yyyy年MM月dd日");

                            	//simpleDateFormat.format(date).toString();

                                 out.print("文件上传成功：<br>");

                                 out.print("文件名:"+name + "  " +"<br>");

                                 out.print("上传后的文件："+path+m.group(1)+"<br>");

                                 out.print("文件大小："+ mSize + "K<br>");

                                 out.print("文件格式："+type+"<br>");

                                 out.print("文件名："+fileName+"<br>");

                                 out.print("上传时间: "+printDate+"<br>");

                                 out.print("simpleDateFormat:"+simpleDateFormat.format(date).toString());

                                 // 在下文中上传文件至数据库时，将对这里改写结束

                            } catch (Exception e) {

                                 out.println(e);

                            }
                       } else {

                            throw new IOException("上传失败！");

                       }

                   }

              }

         } catch (IOException e) {

              out.println(e);

         } catch (FileUploadException e) {

              out.println(e);

         }

     }

}

demo.jsp


<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>DEMO</title>

	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>

  <body>
    upload
    <form action="upload" method="post" enctype="multipart/form-data" name="form1">
    	<input type="file" name="file" />
    	<input type="submit" name="submit" value="上传" />     
    </form>
     <br>
  </body>
</html>


<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.4" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee   http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
  <servlet>
    <servlet-name>upload</servlet-name>
    <servlet-class>Upload</servlet-class>
  </servlet>
<servlet-mapping>
    <servlet-name>upload</servlet-name>
    <url-pattern>/upload</url-pattern>
  </servlet-mapping>
</web-app>

需要的包有：commons-io commons-fileupload