服务器之家

服务器之家 > 正文

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

时间:2020-06-23 12:47     来源/作者:jefry_xdz

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:

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
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

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
<%@ 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

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
<%@ 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>

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服务器之家。

相关文章

热门资讯

2020微信伤感网名听哭了 让对方看到心疼的伤感网名大全
2020微信伤感网名听哭了 让对方看到心疼的伤感网名大全 2019-12-26
歪歪漫画vip账号共享2020_yy漫画免费账号密码共享
歪歪漫画vip账号共享2020_yy漫画免费账号密码共享 2020-04-07
沙雕群名称大全2019精选 今年最火的微信群名沙雕有创意
沙雕群名称大全2019精选 今年最火的微信群名沙雕有创意 2019-07-07
玄元剑仙肉身有什么用 玄元剑仙肉身境界等级划分
玄元剑仙肉身有什么用 玄元剑仙肉身境界等级划分 2019-06-21
男生常说24816是什么意思?女生说13579是什么意思?
男生常说24816是什么意思?女生说13579是什么意思? 2019-09-17
返回顶部