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  • 文件的上传和下载

    1.上传文件界面

     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.下载文件界面

     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 <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
 6 <% String path=request.getContextPath(); %>
 7 <script type="text/javascript" src="../js/jquery-1.7.2.js"></script>
 8 <script type="text/javascript">
 9 $(function(){
10     
11     $("input").click(function(){
12     
13         location.href="<%=path%>/FindInfoServlet";
14     
15     })
16     
17 })
18 </script>
19 <head>
20 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
21 <title>Insert title here</title>
22 </head>
23 
24 <body>
25 <input type="button" value="查询数据">
26 <table border="1">
27 <tr>
28 <th>序号</th>
29 <th>文件名</th>
30 <th>文件类型</th>
31 <th>文件路径</th>
32 <th>文件大小</th>
33 <th>上传时间</th>
34 <th>下载次数</th>
35 <th>操作</th>
36 </tr>
37 
38 
39 <c:forEach items="${list }" var="v" varStatus="vs">
40 <tr>
41 <td>${v.getId()}</td>
42 <td>${v.getFname()}</td>
43 <td>${v.getType()}</td>
44 <td>${v.getPath()}</td>
45 <td>${v.getSize()}</td>
46 <td>${v.getTime()}</td>
47 <td></td>
48 <td><a href="<%=path%>/DownLoadServlet?ID=${v.getId()}"><button type="button">下载</button></a></td>
49 
50 </tr>
51 </c:forEach>
52 </table>
53 </body>
54 </html>
    View Code

    3.连接数据库的类

     1 package com.zdsofe.work;
 2 
 3 import java.sql.Connection;
 4 import java.sql.DriverManager;
 5 import java.sql.SQLException;
 6 
 7 public class DBUtil {
 8     private static String DRIVER="com.mysql.jdbc.Driver";
 9     private static String URL="jdbc:mysql://localhost:3306/mysql";
10     private static String user="root";
11     private static String key="775297";
12     public static Connection conn;
13     
14     //加载驱动
15         static{
16             try {
17                 Class.forName(DRIVER);
18             } catch (ClassNotFoundException e) {
19                 e.printStackTrace();
20             }
21         }
22         //连接数据库
23         public static Connection getConnection(){
24          try {
25             conn = DriverManager.getConnection(URL, user, key);
26         } catch (SQLException e) {
27             e.printStackTrace();
28         }
29             return conn;
30         }
31 }
    View Code

    4.文件的属性

     1 package com.zdsofe.work;
 2 
 3 import java.text.SimpleDateFormat;
 4 import java.util.Date;
 5 
 6 public class FileDemo {
 7     
 8      //文件ID
 9      private int id;
10      //文件名
11      private String fname;
12      //文件类型
13      private String type;
14      //文件路径
15      private String path;
16      //文件大小
17      private int size ;
18      //文件上传时间
19      private String time;
20      
21      
22     public FileDemo( String fname, String type, String path, int size) {            
23         this.fname = fname;
24         this.type = type;
25         this.path = path;
26         this.size = size;
27         
28     }
29     
30     public FileDemo(String path) {
31         
32         this.path = path;
33     }
34 
35     public FileDemo(int id, String fname, String type, String path, int size,
36             String time) {
37     
38         this.id = id;
39         this.fname = fname;
40         this.type = type;
41         this.path = path;
42         this.size = size;
43         this.time = time;
44     }
45 
46     public int getId() {
47         return id;
48     }
49     public void setId(int id) {
50         this.id = id;
51     }
52     public String getFname() {
53         return fname;
54     }
55     public void setFname(String fname) {
56         this.fname = fname;
57     }
58     public String getType() {
59         return type;
60     }
61     public void setType(String type) {
62         this.type = type;
63     }
64     public String getPath() {
65         return path;
66     }
67     public void setPath(String path) {
68         this.path = path;
69     }
70     public int getSize() {
71         return size;
72     }
73     public void setSize(int size) {
74         this.size = size;
75     }
76     public String getTime() {
77         SimpleDateFormat sf=new SimpleDateFormat();
78         time=sf.format(new Date());
79         return time;
80     }
81     public void setTime(String time) {
82         this.time = time;
83     }
84      
85      
86      
87 }
    View Code

    5.下载的服务器

     1 package com.zdsofe.work;
 2 
 3 import java.io.File;
 4 import java.io.FileInputStream;
 5 import java.io.IOException;
 6 import java.io.InputStream;
 7 import java.io.OutputStream;
 8 
 9 import javax.servlet.ServletException;
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 
15 /**
16  * Servlet implementation class DownLoadServlet
17  */
18 @WebServlet("/DownLoadServlet")
19 public class DownLoadServlet extends HttpServlet {
20     private static final long serialVersionUID = 1L;
21        
22     /**
23      * @see HttpServlet#HttpServlet()
24      */
25     public DownLoadServlet() {
26         super();
27         // TODO Auto-generated constructor stub
28     }
29 
30     /**
31      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
32      */
33     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
34             //获取参数
35             String id= request.getParameter("ID");
36             //通过id获取对象
37             FileDemo demo= FileDao.findInfoById(id);
38             //获取文件路径
39             String path=demo.getPath();
40             //根据文件路径获取对象
41             File file = new File(path);;
42             //设置响应文件的类型
43             response.setContentType(demo.getType());
44             //设置响应头部信息
45             String contentDispion = "attachment;filename="+file.getName()+"";
46             //设置文件头部信息
47             response.setHeader("content-disposition",contentDispion);
48             
49             InputStream in = new FileInputStream(file);
50             //处输出流对象
51             OutputStream out = response.getOutputStream();
52             byte[] b = new byte[1024];
53             //输出文件
54             int len = 0;
55             
56             while((len = in.read(b)) != -1)
57             {
58                 out.write(b, 0, len);
59             }
60             
61             
62             out.flush();
63             out.close();
64             in.close();
65             
66     }
67 
68     /**
69      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
70      */
71     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
72         // TODO Auto-generated method stub
73     }
74 
75 }
    View Code

    6.Dao层

     1 package com.zdsofe.work;
 2 
 3 import java.sql.PreparedStatement;
 4 import java.sql.ResultSet;
 5 import java.sql.SQLException;
 6 import java.util.ArrayList;
 7 import java.util.List;
 8 
 9 public class FileDao {
10 
11     //保存文件
12     public static void saveFile(FileDemo f)
13     {
14         //sql语句
15         String sql="insert into run(fname,type,path,size,time) values(?,?,?,?,?)";
16         //执行sql
17 
18         try {        
19               PreparedStatement ps= DBUtil.getConnection().prepareStatement(sql);
20               ps.setString(1, f.getFname());
21               ps.setString(2, f.getType());
22               ps.setString(3, f.getPath());
23               ps.setInt(4, f.getSize());
24               ps.setString(5, f.getTime());      
25               ps.executeUpdate();
26       
27     } catch (SQLException e) {
28         e.printStackTrace();
29     }
30     }
31     
32     //查询所有的文件    
33     public static List<FileDemo> findInfo()
34     {
35         //sql语句
36         String sql="select * from run";
37         //执行sql
38         PreparedStatement ps;
39         //接受数据的集合
40         List<FileDemo> list=new ArrayList<FileDemo>();
41         try {
42                 ps = DBUtil.getConnection().prepareStatement(sql);
43                 ResultSet rs=ps.executeQuery();
44                 
45                 while(rs.next())
46                 {
47                     int id=rs.getInt("id");
48                     String name=rs.getString("fname");
49                     String type=rs.getString("type");
50                     String path=rs.getString("path");
51                     int size=rs.getInt("size");
52                     String time=rs.getString("time");
53                     FileDemo demo=new FileDemo(id, name, type, path, size, time);
54                     list.add(demo);
55                 }
56         } catch (Exception e) {
57             e.printStackTrace();
58              }
59          return list;
60     }
61     
62     //根据ID来查询
63     public static FileDemo findInfoById(String id)
64     {
65         //sql语句
66         String sql ="select * from run as r where r.id='"+id+"'";
67         ResultSet rs=null;
68         FileDemo demo=null;
69         //执行sql
70         try {
71             PreparedStatement ps=DBUtil.getConnection().prepareStatement(sql);
72             rs=ps.executeQuery();
73             while(rs.next())
74             {
75                 int dd=rs.getInt("id");
76                 String name=rs.getString("fname");
77                 String type=rs.getString("type");
78                 String path=rs.getString("path");
79                 int size=rs.getInt("size");
80                 String time=rs.getString("time");
81                 demo=new FileDemo(dd,name,type,path,size,time);
82             }
83         } catch (SQLException e) {
84             e.printStackTrace();
85         }
86         return demo;
87     }
88     
89 }
    View Code

    7.过滤器

     1 package com.zdsofe.work;
 2 
 3 import java.io.IOException;
 4 
 5 import javax.servlet.Filter;
 6 import javax.servlet.FilterChain;
 7 import javax.servlet.FilterConfig;
 8 import javax.servlet.ServletException;
 9 import javax.servlet.ServletRequest;
10 import javax.servlet.ServletResponse;
11 import javax.servlet.http.HttpServletRequest;
12 import javax.servlet.http.HttpServletResponse;
13 
14 public class filter implements Filter {
15 
16     @Override
17     public void destroy() {
18         // TODO Auto-generated method stub
19 
20     }
21 
22     @Override
23     public void doFilter(ServletRequest arg0, ServletResponse arg1,
24             FilterChain arg2) throws IOException, ServletException {
25         
26         HttpServletRequest request=(HttpServletRequest)arg0;
27         HttpServletResponse response=(HttpServletResponse)arg1;
28         request.setCharacterEncoding("utf-8");
29         response.setCharacterEncoding("utf-8");
30         response.setContentType("text/html charset=utf-8");
31         arg2.doFilter(request, response);
32     }
33 
34     @Override
35     public void init(FilterConfig arg0) throws ServletException {
36         // TODO Auto-generated method stub
37 
38     }
39 
40 }
    View Code

    8.配置xml

     1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
 3   <display-name>webProject7</display-name>
 4   <filter>
 5     <filter-name>encode</filter-name>
 6     <filter-class>com.zdsofe.work.filter</filter-class>
 7   </filter>
 8   <filter-mapping>
 9     <filter-name>encode</filter-name>
10     <url-pattern>/*</url-pattern>
11   </filter-mapping>
12   <welcome-file-list>
13     <welcome-file>index.html</welcome-file>
14     <welcome-file>index.htm</welcome-file>
15     <welcome-file>index.jsp</welcome-file>
16     <welcome-file>default.html</welcome-file>
17     <welcome-file>default.htm</welcome-file>
18     <welcome-file>default.jsp</welcome-file>
19   </welcome-file-list>
20 </web-app>
    View Code

    9.上传的服务器

      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     private static final String LOCATION="D://upFile"; 
 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         if(!CollectionUtils.isEmpty(parts))
 84         {
 85             for(Part part : parts)
 86             {
 87                  //获取文件头信息
 88                  String content= part.getHeader("content-disposition");
 89                  //获取文件的类型
 90                  String type= part.getContentType();
 91                  //获取文件的大小
 92                  long size=  part.getSize();                
 93                  //获取文件名所在的位置
 94                  int a= content.indexOf("filename=");                 
 95                  //获取完整的文件名
 96                  String name=content.substring(a+10,content.lastIndexOf(""") );
 97                  //获取文件的路径
 98                  String path=LOCATION+File.separator+name;
 99                  //讲上传的文件写到指定的位置
100                  part.write(name);
101                  
102                  FileDemo demo=new FileDemo(name, type, path, (int)size);
103                  //调用保存方法
104                  FileDao.saveFile(demo);
105                
106                 
107             }
108         }
109                 
110     }
111 
112 }
    View Code

                         
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  • 原文地址：https://www.cnblogs.com/zclqian/p/7281579.html
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