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  • 单文件上传和多文件上传实例

    一、单文件上传

    1.上传页面

     1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <form action="../upLoadServlet" method="post" enctype="multipart/form-data">
11 <label>请选择文件</label><br/>
12 <input type="file" name="fileName"/><br/>
13 <button type="submit">提交</button>
14 </form>
15 </body>
16 </html>
    View Code

    2.服务器端

     1 package com.zdsofe.work;
 2 
 3 import java.io.File;
 4 import java.io.IOException;
 5 
 6 import javax.servlet.ServletConfig;
 7 import javax.servlet.ServletException;
 8 import javax.servlet.annotation.MultipartConfig;
 9 import javax.servlet.annotation.WebServlet;
10 import javax.servlet.http.HttpServlet;
11 import javax.servlet.http.HttpServletRequest;
12 import javax.servlet.http.HttpServletResponse;
13 import javax.servlet.http.Part;
14 
15 /**
16  * Servlet implementation class upLoadServlet
17  */
18 @WebServlet("/upLoadServlet")
19 @MultipartConfig(location="D://upFile",
20                  fileSizeThreshold=1024*1024*20,
21                  maxFileSize=1024*1024*20,
22                  maxRequestSize=1024*1024*40        
23         )
24 public class upLoadServlet extends HttpServlet {
25     private static final long serialVersionUID = 1L;
26        
27     /**
28      * @see HttpServlet#HttpServlet()
29      */
30     public upLoadServlet() {
31         super();
32         // TODO Auto-generated constructor stub
33     }
34 
35     /**
36      * @see Servlet#init(ServletConfig)
37      */
38     public void init(ServletConfig config) throws ServletException {
39         
40         File file=new File("D://upFile");
41         if(!file.exists()&&!file.isDirectory())
42         {
43             file.mkdir();
44         }
45     }
46 
47     /**
48      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
49      */
50     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
51         // TODO Auto-generated method stub
52     }
53 
54     /**
55      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
56      */
57     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
58          //得到part对象
59          Part part=request.getPart("fileName");
60          if(part!=null)
61          {  
62             /* //获得文件的类型
63              String type= part.getContentType();
64              //获取文件的大小
65              long size= part.getSize();*/
66              //获取文件头信息
67              String content= part.getHeader("content-disposition");
68              //获取文件名所在的位置
69              int a= content.indexOf("filename=");
70              //获取完整的文件名
71              String name=content.substring(a+10,content.lastIndexOf(""") );
72              //讲上传的文件写到指定的位置
73              part.write(name);
74          }
75     }
76 
77 }
    View Code

    二、多文件上传

    1、上传页面

     1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <form action="../upLoadServlet" method="post" enctype="multipart/form-data">
11 <label>请选择文件</label><br/>
12 <input type="file" name="fileName"/><br/>
13 <input type="file" name="fileName"/><br/>
14 <input type="file" name="fileName"/><br/>
15 <button type="submit">提交</button>
16 </form>
17 </body>
18 </html>
    View Code

    2.服务器端

      1 package com.zdsofe.work;
  2 
  3 import java.io.File;
  4 import java.io.IOException;
  5 import java.util.Collection;
  6 
  7 import javax.servlet.ServletConfig;
  8 import javax.servlet.ServletException;
  9 import javax.servlet.annotation.MultipartConfig;
 10 import javax.servlet.annotation.WebServlet;
 11 import javax.servlet.http.HttpServlet;
 12 import javax.servlet.http.HttpServletRequest;
 13 import javax.servlet.http.HttpServletResponse;
 14 import javax.servlet.http.Part;
 15 
 16 import org.apache.commons.collections.CollectionUtils;
 17 
 18 /**
 19  * Servlet implementation class upLoadServlet
 20  */
 21 @WebServlet("/upLoadServlet")
 22 @MultipartConfig(location="D://upFile",
 23                  fileSizeThreshold=1024*1024*20,
 24                  maxFileSize=1024*1024*20,
 25                  maxRequestSize=1024*1024*40        
 26         )
 27 public class upLoadServlet extends HttpServlet {
 28     private static final long serialVersionUID = 1L;
 29        
 30     /**
 31      * @see HttpServlet#HttpServlet()
 32      */
 33     public upLoadServlet() {
 34         super();
 35         // TODO Auto-generated constructor stub
 36     }
 37 
 38     /**
 39      * @see Servlet#init(ServletConfig)
 40      */
 41     public void init(ServletConfig config) throws ServletException {
 42         
 43         File file=new File("D://upFile");
 44         if(!file.exists()&&!file.isDirectory())
 45         {
 46             file.mkdir();
 47         }
 48     }
 49 
 50     /**
 51      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 52      */
 53     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 54         // TODO Auto-generated method stub
 55     }
 56 
 57     /**
 58      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 59      */
 60     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 61          /*
 62           * 单文件上传
 63           * //得到part对象
 64          Part part=request.getPart("fileName");
 65          if(part!=null)
 66          {  
 67              //获得文件的类型
 68              String type= part.getContentType();
 69              //获取文件的大小
 70              long size= part.getSize();
 71              //获取文件头信息
 72              String content= part.getHeader("content-disposition");
 73              //获取文件名所在的位置
 74              int a= content.indexOf("filename=");
 75              //获取完整的文件名
 76              String name=content.substring(a+10,content.lastIndexOf(""") );
 77              //讲上传的文件写到指定的位置
 78              part.write(name);
 79          }*/
 80         
 81         //多文件上传
 82         Collection<Part> parts=request.getParts();
 83         StringBuffer sf=new StringBuffer();
 84         if(!CollectionUtils.isEmpty(parts))
 85         {
 86             for(Part part : parts)
 87             {
 88                  //获取文件头信息
 89                  String content= part.getHeader("content-disposition");
 90                  //获取文件名所在的位置
 91                  int a= content.indexOf("filename=");
 92                  //获取完整的文件名
 93                  String name=content.substring(a+10,content.lastIndexOf(""") );
 94                  //讲上传的文件写到指定的位置
 95                  part.write(name);
 96                  
 97                  sf.append(name).append(",");
 98             }
 99         }
100         
101         String result= sf.toString().substring(0,sf.toString().length()-1);        
102         request.setAttribute("re", result);
103         System.out.println(111);
104         request.getRequestDispatcher("/pages/welcome.jsp").forward(request, response);;
105     }
106 
107 }
    View Code

    3.跳转页面

     1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 欢迎<%=request.getAttribute("re")
11 %>进入
12 </body>
13 </html>
    View Code
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  • 原文地址：https://www.cnblogs.com/zclqian/p/7273187.html
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