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

作者：jefry_xdz 时间：2022-02-24 22:16:59　

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：

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

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。

标签：java,commons,fileupload,上传,下载,在线打开
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