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java组件commons-fileupload实现文件上传、下载、在线打开

2019年07月22日  | 移动技术网IT编程  | 我要评论

最近做了一个文件上传、下载、与在线打开文件的功能，刚开始对文件上传的界面中含有其它表单（例如输入框、密码等）在上传的过程中遇到了许多问题，下面我写了一个同时实现文件上传、下载、在线打开文件的测试程序。

首先请看效果图：

 

核心代码： 

package com.jefry; 
 
import java.io.file; 
import java.io.fileinputstream; 
import java.io.ioexception; 
import java.net.url; 
import java.util.arraylist; 
import java.util.iterator; 
import java.util.list; 
 
import javax.servlet.servletexception; 
import javax.servlet.servletoutputstream; 
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.disk.diskfileitemfactory; 
import org.apache.commons.fileupload.servlet.servletfileupload; 
 
/** 
 * servlet implementation class fileupload 
 */ 
public class fileupload extends httpservlet { 
 private static final long serialversionuid = 1l; 
 private static final string filedir = "f:/"; 
 /** 
 * default constructor. 
 */ 
 public fileupload() { 
  
 } 
 
 protected void doget(httpservletrequest request, 
  httpservletresponse response) throws servletexception, ioexception { 
 
 string afilename = request.getparameter("filename"); 
 string online = request.getparameter("online"); 
 fileinputstream in = null; 
 servletoutputstream out = null; 
 boolean isonline = online != null ? true : false ; 
 try { 
  
  
  if(isonline){ 
  url u = new url("file:///"+filedir + afilename); 
  response.setcontenttype(u.openconnection().getcontenttype()); 
  response.setheader("content-disposition", "inline; filename="+afilename); 
  } 
  else{ 
  response.setcontenttype("application/x-msdownload"); 
  response.setheader("content-disposition", "attachment; filename=" + afilename); 
  } 
  
  in = new fileinputstream(filedir + afilename); 
  out = response.getoutputstream(); 
  out.flush(); 
  int aread = 0; 
  while ((aread = in.read()) != -1 & in != null) { 
  out.write(aread); 
  } 
  out.flush(); 
  
 } catch (throwable e) { 
  e.printstacktrace(); 
 } finally { 
  try { 
  in.close(); 
  out.close(); 
  } catch (throwable e) { 
  e.printstacktrace(); 
  } 
 } 
 
 } 
 
 protected void dopost(httpservletrequest request, 
  httpservletresponse response) throws servletexception, ioexception { 
 try { 
  diskfileitemfactory filefactory = new diskfileitemfactory(); 
  servletfileupload fu = new servletfileupload(filefactory); 
  list fileitems = fu.parserequest(request); 
  iterator iter = fileitems.iterator(); 
  string uploader = null; 
  string date = null; 
  list<string> filenames = new arraylist<string>(); 
  while (iter.hasnext()) { 
  fileitem item = (fileitem) iter.next(); 
  if (!item.isformfield()) { // 文件 
   string oldfilename = item.getname(); 
   string newfilename = null; 
   int delimiter = oldfilename.lastindexof("/"); 
   if (delimiter == -1) 
   newfilename = oldfilename.substring(delimiter + 1); 
   else 
   newfilename = oldfilename; 
   filenames.add(newfilename); 
   item.write(new file(filedir + newfilename)); 
  } else { // 表单 
   string fieldname = item.getfieldname(); 
   if ("uploader".equals(fieldname)) { 
   uploader = item.getstring(); 
   } else if ("date".equals(fieldname)) { 
   date = item.getstring(); 
   } 
  } 
  } 
  request.setattribute("filenames",filenames); 
  request.getrequestdispatcher("download.jsp").forward(request, response); 
 } catch (exception e) { 
 
 } 
 } 
 
}

index.jsp

<%@ page language="java" contenttype="text/html; charset=utf-8" 
 pageencoding="utf-8"%> 
<!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> 
<html> 
<head> 
<meta http-equiv="content-type" content="text/html; charset=utf-8"> 
<title>insert title here</title> 
</head> 
<body> 
 <form action="fileupload" method="post" enctype="multipart/form-data"> 
 <br> 
 文件一：<input type="file" name="file1" /> <br> 
 文件二：<input type="file" name="file2" /> <br> 
 上传者:<input type="text" name="uploader"/> <br> 
  日期:<input type="text" name="date"/> <br> 
  <input type="submit" value="提交"/> 
 
 </form> 
</body> 
</html>

download.jsp

<%@ page language="java" contenttype="text/html; charset=utf-8" 
 pageencoding="utf-8"%> 
<!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> 
 
<%@page import="java.util.list"%><html> 
<head> 
<meta http-equiv="content-type" content="text/html; charset=utf-8"> 
<title>insert title here</title> 
</head> 
<body> 
 
 <br> 
 --------------直接下载------------ 
 <br> 
 <% 
 list<string> filenames = (list<string> )request.getattribute("filenames"); 
 for(string filename : filenames) { 
 %> 
 
 <form action="fileupload" method="get"> 
  <input type="hidden" name="filename" value="<%=filename %>" /> 
  <input type="submit" value="下载:<%=filename %>" /> 
 </form> 
 <% 
 } 
 %> 
 <br> 
 --------------直接打开--------- 
 <% 
 for(string filename : filenames) { 
 %> 
 <form action="fileupload" method="get"> 
  <input type="hidden" name="filename" value="<%=filename %>" /> 
  <input type="hidden" name="online" value="yes" /> 
  <input type="submit" value="打开:<%=filename %>" /> 
 </form> 
 <% 
 } 
 %> 
 </br> 
 
</body> 
</html>

本文已被整理到了《java上传操作技巧汇总》，欢迎大家学习阅读。

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