文件的和上传下载

于 2019-07-30 12:49:07 发布
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本文链接：https://blog.youkuaiyun.com/lunaticCode1/article/details/97768441
版权

1.index.jsp

<a href="FileupLoad/upLoad.jsp">文件的上传</a>
<a href="queryAllServlet">文件的下载</a>

在这里插入图片描述

2.文件的上传

将文件上传到文件夹，该文件夹路径为发布到服务器的WEB-INF目录下的files目录，文件的路径等信息储存进数据库
2.0.在WEB-INF目录下的建立files目录，文件上传到该目录

2.1.FileupLoad目录下的upLoad.jsp

<%--
  Created by IntelliJ IDEA.
  User: H
  Date: 2019/7/23
  Time: 12:36
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>upLoad</title>
    <script type="text/javascript" src="../script/jquery-1.7.2.js"></script>
    <script type="text/javascript">
        $(function () {
            var i = 2;
            $("#addFile").click(function () {
                $(this).parent().parent().before("<tr class='file'><td>File" +
                    i + ":</td><td><input type='file' name='file" +
                    i + "'></td></tr><tr class='desc'><td>desc" +
                    i + ":</td><td><input type='text' name='desc" +
                    i + "'\"><button class='delete'>删除</button></td></tr>")
                $(".delete").click(function () {
                    var $tr = $(this).parent().parent();
                    $tr.prev("tr").remove();
                    $tr.remove();

                    $(".file").each(function (index) {
                        $(this).find("td:first").text("File"+(index+1));
                        $(this).find("td:last input").attr("name","file"+(index+1));
                    })
                    $(".desc").each(function (index) {
                        $(this).find("td:first").text("desc"+(index+1));
                        $(this).find("td:last input").attr("name","desc"+(index+1));
                    })
                    return false;
                })
                i++;
                return false;
            })
        });

    </script>
</head>
<body>
<form action="../upLoadServlet" method="post" enctype="multipart/form-data">
    <font color="red">${requestScope.message}</font>
    <table>
        <tr class="file">
            <td>File1:</td>
            <td><input type="file" name="file1"></td>
        </tr>
        <tr class="desc">
            <td>Desc1:</td>
            <td><input type="text" name="desc1"></td>
        </tr>
        <tr>
            <td><input type="submit" value="Submit"></td>
            <td>
                <button id="addFile">新增一个附件</button>
            </td>
        </tr>
    </table>
</form>
</body>
</html>

2.2.连接数据库
在这里插入图片描述
src目录下的c3p0-config.xml

<c3p0-config>
   <!--配置连接池mysql-->
    <named-config name="mvcapp">
        <property name="driverClass">com.mysql.jdbc.Driver</property>  
        <property name="jdbcUrl">jdbc:mysql://127.0.0.1:3306/FileUpload</property>
        <property name="user">root</property>  
        <property name="password">qq2694200519</property>  
        <property name="initialPoolSize">10</property>  
        <property name="maxIdleTime">30</property>  
        <property name="maxPoolSize">100</property>  
        <property name="minPoolSize">10</property>  
        <property name="maxStatements">200</property>
        <property name="maxStatementsPerConnection">5</property>
    </named-config>  
</c3p0-config>

jdbcUtil

package com.zx.fileUpLoad.c3po;

import com.mchange.v2.c3p0.ComboPooledDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;

public class jdbcUtil {

private static DataSource dataSource=null;
static {
    dataSource=new  ComboPooledDataSource("mvcapp");
}

    /**
     * 获取数据库连接
     * @return
     */
    public static Connection getConnection(){
    try {
        return dataSource.getConnection();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return null;
}

public static void realseConnection(Connection connection){
        if(connection!=null){
            try {
                connection.close();
            } catch (SQLException e) {
                System.out.println("关闭数据库连接失败");
            }
            System.out.println("关闭数据库连接成功");
        }
}
}

DAO

package com.zx.fileUpLoad.DAO;

import com.zx.fileUpLoad.c3po.jdbcUtil;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;

public class DAO<T> {
   public  Class<T>clazz;
   private QueryRunner queryRunner=new QueryRunner();
    public DAO(){
        Type type=getClass().getGenericSuperclass();
        if(type instanceof ParameterizedType){
            ParameterizedType parameterizedType=(ParameterizedType)type;
           Type[]types=parameterizedType.getActualTypeArguments();
           if(types!=null&&types.length>0){
               clazz=(Class<T>)types[0];
           }
        }
    }
public List<T>getForList(String sql,Object...args){
        Connection connection=jdbcUtil.getConnection();
    try {
        System.out.println(clazz);
        return queryRunner.query(connection,sql,new BeanListHandler<>(clazz),args);
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return null;
}
public T get(String sql,Object...args){
    Connection connection=jdbcUtil.getConnection();
    try {
        return queryRunner.query(connection,sql,new BeanHandler<>(clazz),args);
    } catch (SQLException e) {
        e.printStackTrace();
    }finally {
        jdbcUtil.realseConnection(connection);
    }
        return null;
}

public  <E>E getValue(String sql,Object...args){

    Connection connection=null;
    try {
        connection=jdbcUtil.getConnection();
        return (E)queryRunner.query(connection,sql,new ScalarHandler(),args);
    } catch (Exception e) {
        e.printStackTrace();
    }finally {
        jdbcUtil.realseConnection(connection);
    }
    return null;
}

public void Updata(String sql,Object...args){
        Connection connection=jdbcUtil.getConnection();
    try {
        queryRunner.update(connection,sql,args);
    } catch (SQLException e) {
        e.printStackTrace();
    }finally {
        jdbcUtil.realseConnection(connection);
    }
}
}

FilrUpLoadBeanDAO

package com.zx.fileUpLoad.DAO;

import com.zx.fileUpLoad.doMain.FilrUpLoadBean;

import java.util.List;

public interface FilrUpLoadBeanDAO {
    public void sava(List<FilrUpLoadBean> filrUpLoadBeans);
    public List<FilrUpLoadBean> getAll();
    public FilrUpLoadBeanDAO get(int id);
    public void Delete(int id);
}

impFilrUpLoadBeanDAO

package com.zx.fileUpLoad.imple;

import com.zx.fileUpLoad.DAO.DAO;
import com.zx.fileUpLoad.DAO.FilrUpLoadBeanDAO;
import com.zx.fileUpLoad.doMain.FilrUpLoadBean;

import java.util.List;

public class impFilrUpLoadBeanDAO extends DAO<FilrUpLoadBean> implements FilrUpLoadBeanDAO {
    @Override
    public void sava(List<FilrUpLoadBean> filrUpLoadBeans) {
        String sql = "INSERT INTO Filruploadbean(fileName,filePath,fileDesc) VALUES(?,?,?)";
        for (FilrUpLoadBean filr : filrUpLoadBeans) {
            Updata(sql, filr.getFileName(), filr.getFilePath(), filr.getFileDesc());
        }
    }

    @Override
    public List<FilrUpLoadBean> getAll() {
        String sql = "SELECT*FROM Filruploadbean";
        return getForList(sql);
    }

    @Override
    public FilrUpLoadBeanDAO get(int id) {
        String sql = "SELECT*FROM Filruploadbean WHERE id=?";
        return (FilrUpLoadBeanDAO) get(sql, id);
    }


    @Override
    public void Delete(int id) {
        String sql = "DELETE FROM Filruploadbean WHERE id=?";
        Updata(sql,id);
    }
}

FilrUpLoadBean

package com.zx.fileUpLoad.doMain;

public class FilrUpLoadBean {
    private int id;
    private String fileName;
    private String filePath;
    private String fileDesc;

    public FilrUpLoadBean() {
    }

    public FilrUpLoadBean(String fileName, String filePath, String fileDesc) {
        this.fileName = fileName;
        this.filePath = filePath;
        this.fileDesc = fileDesc;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getFileName() {
        return fileName;
    }

    public void setFileName(String fileName) {
        this.fileName = fileName;
    }

    public String getFilePath() {
        return filePath;
    }

    public void setFilePath(String filePath) {
        this.filePath = filePath;
    }

    public String getFileDesc() {
        return fileDesc;
    }

    public void setFileDesc(String fileDesc) {
        this.fileDesc = fileDesc;
    }

    @Override
    public String toString() {
        return "FilrUpLoadBean{" +
                "id='" + id + '\'' +
                ", fileName='" + fileName + '\'' +
                ", filePath='" + filePath + '\'' +
                ", fileDesc='" + fileDesc + '\'' +
                '}';
    }
}

2.3.用配置文件限制能上传文件的扩展名等信息
src下的upload.properties

exts=pptx,docx,doc,java,mp4
file.max.size=1048576
total.file.max.size=5242880

FileUpLoadProperties

package com.zx.fileUpLoad.doMain;

import java.util.HashMap;
import java.util.Map;

public class FileUpLoadProperties {
    private FileUpLoadProperties(){}
    private Map<String,String>propertiess=new HashMap<>();
    private static FileUpLoadProperties instances=new FileUpLoadProperties();
    public static FileUpLoadProperties getInstances(){
        return instances;
    }

    public String getProperties(String key) {
        return propertiess.get(key);
    }

    public void putProperties(String key,String value) {
        this.propertiess .put(key,value);
    }
}

监听器ReadPropertiesFile

package com.zx.fileUpLoad.Listener;

import com.zx.fileUpLoad.doMain.FileUpLoadProperties;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;
import java.util.Properties;

public class ReadPropertiesFile implements ServletContextListener {
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        InputStream in = getClass().getClassLoader().getResourceAsStream("upload.properties");
        Properties properties = new Properties();
        try {
            properties.load(in);
            for (Map.Entry<Object, Object> pro : properties.entrySet()) {
                String propertiesName = (String) pro.getKey();
                String propertiesValue = (String) pro.getValue();
                System.out.println(propertiesName);
                System.out.println(propertiesValue);
                FileUpLoadProperties.getInstances().putProperties(propertiesName, propertiesValue);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {

    }
}

若扩展名不合法所写的异常类
InvaildExtNameException

package com.zx.fileUpLoad.Exception;

public class InvaildExtNameException extends RuntimeException {
    public InvaildExtNameException(String message) {
        super(message);
    }
}

2.4.upLoadServlet

package com.zx.fileUpLoad.Servlet;

import com.zx.fileUpLoad.DAO.FilrUpLoadBeanDAO;
import com.zx.fileUpLoad.Exception.InvaildExtNameException;
import com.zx.fileUpLoad.doMain.FileUpLoadProperties;
import com.zx.fileUpLoad.doMain.FilrUpLoadBean;
import com.zx.fileUpLoad.imple.impFilrUpLoadBeanDAO;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.*;

public class upLoadServlet extends HttpServlet {
    private static final String File_Path = "/WEB-INF/files/";
    private static final String tempDirectoryPath="E:\\idea2018.1\\FileUpload\\tempDirectory";
private FilrUpLoadBeanDAO uploadFileDAO=new impFilrUpLoadBeanDAO();
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        ServletFileUpload upload = getServletFileUpload();
        String FilePath=null;
// Set overall request size constraint
//        最大上传500m
        upload.setSizeMax(1024*1024*500);
        request.setCharacterEncoding("UTF-8");
        try {
            //把需要上传的items都放进该Map中
            Map<String, FileItem> upLoadFiles = new HashMap<>();
            //解析请求
            List<FileItem> items = upload.parseRequest(request);
            //1.构建FilrUpLoadBean的集合,同时填充upLoadFiles
            List<FilrUpLoadBean> beans = buildFilUpLoadBeans(items, upLoadFiles);
            //2.效验扩展名
            vaidateExtName(beans);
            //3.效验文件大小,解析时已经效验，我们只需通过异常得到结果
            //4.进行文件上传操作
            upload(upLoadFiles);
            //5.把上传信息保存到数据库
            savaUpLoadBean(beans);
            FilePath=request.getContextPath()+"WEB-INF/promt/success.jsp";
        } catch (Exception e) {
            FilePath=request.getContextPath()+"FileupLoad/upLoad.jsp";
            request.setAttribute("message",e.getMessage() );
            e.printStackTrace();
        }
request.getRequestDispatcher(FilePath).forward(request,response);
    }

    private void savaUpLoadBean(List<FilrUpLoadBean> beans) {
        uploadFileDAO.sava(beans);
    }

    private void upload(Map<String, FileItem> upLoadFiles) {
        for (Map.Entry<String, FileItem> upLoadFile : upLoadFiles.entrySet()) {
            upload(upLoadFile);
        }
    }

    private void upload(Map.Entry<String, FileItem> upLoadFile) {
        InputStream in = null;
        OutputStream outputStream = null;
        try {
            in = upLoadFile.getValue().getInputStream();
            outputStream = new FileOutputStream(upLoadFile.getKey());
            int len = 0;
            byte[] b = new byte[1024];
            while ((len = in.read(b)) != -1) {
                outputStream.write(b, 0, len);
            }

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                outputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    private void vaidateExtName(List<FilrUpLoadBean> beans) {
        List<String> extsList = Arrays.asList(FileUpLoadProperties.getInstances().getProperties("exts").split(","));
        for (FilrUpLoadBean bean : beans) {
            String fileName=bean.getFileName();
            String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1);
            if (!extsList.contains(fileExt)) {
            //抛的该异常为自己写的异常类
                throw new InvaildExtNameException("文件扩展名不合法");
            }
        }
    }

    private List<FilrUpLoadBean> buildFilUpLoadBeans(List<FileItem> items, Map<String, FileItem> upLoadFiles) throws UnsupportedEncodingException {
        Map<String, String> formField = new HashMap<>();
        List<FilrUpLoadBean> fileUpLoadBeans = new ArrayList<>();
        buildFormField(items, formField);
        buildFileUpLoadBeans(items, upLoadFiles, formField, fileUpLoadBeans);

        return fileUpLoadBeans;
    }

    private void buildFileUpLoadBeans(List<FileItem> items, Map<String, FileItem> upLoadFiles, Map<String, String> formField, List<FilrUpLoadBean> fileUpLoadBeans) {
        for (FileItem item : items) {
            if (!item.isFormField()) {
                String fieldName = item.getFieldName();
                String index = fieldName.substring(fieldName.length() - 1);
                String fileName = item.getName();
                fileName = fileName.substring(fileName.lastIndexOf("\\") + 1);
                String filePath = getFilePath(fileName);
                String s = "desc" + index;
                String fileDesc = formField.get(s);
                System.out.println(fieldName);
                System.out.println(fileName);
                System.out.println(filePath);
                System.out.println(fileDesc);
                FilrUpLoadBean filrUpLoadBean = new FilrUpLoadBean(fileName, filePath, fileDesc);
                fileUpLoadBeans.add(filrUpLoadBean);
                upLoadFiles.put(filePath, item);
            }
        }
    }

    private void buildFormField(List<FileItem> items, Map<String, String> formField) throws UnsupportedEncodingException {
        for (FileItem item : items) {
            if (item.isFormField()) {
                String name = item.getFieldName();
                String value =item.getString("UTF-8");
                formField.put(name, value);
            }
        }
    }

    private String getFilePath(String fileName) {
        String extName = fileName.substring(fileName.lastIndexOf("."));
        Random random = new Random();
        String filePath = getServletContext().getRealPath(File_Path) + "\\" + System.currentTimeMillis() + random.nextInt(100000) + extName;
        return filePath;
    }

   private ServletFileUpload getServletFileUpload() {
        //1.获取List
        // Create a factory for disk-based file items
        DiskFileItemFactory factory = new DiskFileItemFactory();

// Set factory constraints
        //如果上传文件超过了500k就把它放到tempDirectory下
        factory.setSizeThreshold(1024 * 500);
        File tempDirectory = new File(tempDirectoryPath);
        factory.setRepository(tempDirectory);

// Create a new file upload handler
        return new ServletFileUpload(factory);
    }
}

上传成功WEB-INF/promt目录下的success.jsp

<%--
  Created by IntelliJ IDEA.
  User: H
  Date: 2019/7/26
  Time: 12:42
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>success</title>
</head>
<body>
<h2>文件上传成功</h2>
<a href=${pageContext.servletContext.contextPath}"/FileupLoad/upLoad.jsp">return</a>
<a href=${pageContext.servletContext.contextPath}"queryAllServlet">下载文件</a>
</body>
</html>

文件的下载

从数据库获取路径等信息，从而提供下载资源目录等信息
DownLoad.jsp

<html>
<head>
    <title>Down.jsp</title>
</head>
<body>
<c:forEach items="${requestScope.filrUpLoadBeans}" var="filrUpLoadBean">
    FileName:${filrUpLoadBean.fileName}<br>
    Desc:${filrUpLoadBean.fileDesc}<br>
    <c:url var="downLoad" value="DownLoadServlet" scope="request">
        <c:param name="filePath" value="${filrUpLoadBean.filePath}"></c:param>
        <c:param name="fileName" value="${filrUpLoadBean.fileName}"></c:param>
    </c:url>
    <a href="${requestScope.downLoad}">下载</a><br>
    <c:url var="delete" value="DeleteServlet" scope="request">
        <c:param name="filePath" value="${filrUpLoadBean.filePath}"></c:param>
        <c:param name="id" value="${filrUpLoadBean.id}"></c:param>
    </c:url>
    <a href="${requestScope.delete}">Delete</a>
    <hr>
</c:forEach>
<a href="${pageContext.servletContext.contextPath}/index.jsp">index</a>
</body>
</html>

queryAllServlet.java

package com.zx.fileUpLoad.Servlet;

import com.zx.fileUpLoad.DAO.FilrUpLoadBeanDAO;
import com.zx.fileUpLoad.doMain.FilrUpLoadBean;
import com.zx.fileUpLoad.imple.impFilrUpLoadBeanDAO;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;


public class queryAllServlet extends HttpServlet {
    private static FilrUpLoadBeanDAO filrUpLoadBeanDAO=new  impFilrUpLoadBeanDAO();
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        List<FilrUpLoadBean>filrUpLoadBeans= filrUpLoadBeanDAO.getAll();
        request.setAttribute("filrUpLoadBeans",filrUpLoadBeans);
        request.getRequestDispatcher(request.getContextPath()+"/DownLoad/DownLoad.jsp").forward(request,response);
    }
}

DownLoadServlet.java

package com.zx.fileUpLoad.Servlet;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class DownLoadServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("application/x-msdownload");
        String filePath = request.getParameter("filePath");
        String fileName = request.getParameter("fileName");
        response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
//        response.setHeader("Content-Disposition", "attachment;filename=1.txt");
        OutputStream out = response.getOutputStream();
        InputStream in = new FileInputStream(filePath);
        int len = 0;
        byte[] b = new byte[1024];
        if ((len = in.read(b)) != -1) {
            out.write(b, 0, len);
        }
        in.close();
    }
}

DeleteServlet.java

package com.zx.fileUpLoad.Servlet;

import com.zx.fileUpLoad.DAO.FilrUpLoadBeanDAO;
import com.zx.fileUpLoad.imple.impFilrUpLoadBeanDAO;
import org.apache.commons.io.FileUtils;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;

@WebServlet(name = "DeleteServlet")
public class DeleteServlet extends HttpServlet {
    FilrUpLoadBeanDAO filrUpLoadBeanDAO = new impFilrUpLoadBeanDAO();

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String idStr = request.getParameter("id");
        String filePath = request.getParameter("filePath");
        int id = Integer.parseInt(idStr);
        FileUtils.deleteQuietly(new File(filePath));
        filrUpLoadBeanDAO.Delete(id);
        response.sendRedirect("queryAllServlet");
    }


}

DownLoad目录下的DownLoad.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
  Created by IntelliJ IDEA.
  User: H
  Date: 2019/7/26
  Time: 17:01
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Down.jsp</title>
</head>
<body>
<c:forEach items="${requestScope.filrUpLoadBeans}" var="filrUpLoadBean">
    FileName:${filrUpLoadBean.fileName}<br>
    Desc:${filrUpLoadBean.fileDesc}<br>
    <c:url var="downLoad" value="DownLoadServlet" scope="request">
        <c:param name="filePath" value="${filrUpLoadBean.filePath}"></c:param>
        <c:param name="fileName" value="${filrUpLoadBean.fileName}"></c:param>
    </c:url>
    <a href="${requestScope.downLoad}">下载</a><br>
    <c:url var="delete" value="DeleteServlet" scope="request">
        <c:param name="filePath" value="${filrUpLoadBean.filePath}"></c:param>
        <c:param name="id" value="${filrUpLoadBean.id}"></c:param>
    </c:url>
    <a href="${requestScope.delete}">Delete</a>
    <hr>
</c:forEach>
<a href="${pageContext.servletContext.contextPath}/index.jsp">index</a>
</body>
</html>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <servlet>
        <servlet-name>upLoadServlet</servlet-name>
        <servlet-class>com.zx.fileUpLoad.Servlet.upLoadServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>upLoadServlet</servlet-name>
        <url-pattern>/upLoadServlet</url-pattern>
    </servlet-mapping>
    <listener>
        <listener-class>com.zx.fileUpLoad.Listener.ReadPropertiesFile</listener-class>
    </listener>
    <servlet>
        <servlet-name>DownLoadServlet</servlet-name>
        <servlet-class>com.zx.fileUpLoad.Servlet.DownLoadServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>DownLoadServlet</servlet-name>
        <url-pattern>/DownLoadServlet</url-pattern>
    </servlet-mapping>
    <servlet>
        <servlet-name>queryAllServlet</servlet-name>
        <servlet-class>com.zx.fileUpLoad.Servlet.queryAllServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>queryAllServlet</servlet-name>
        <url-pattern>/queryAllServlet</url-pattern>
    </servlet-mapping>
    <servlet>
        <servlet-name>DeleteServlet</servlet-name>
        <servlet-class>com.zx.fileUpLoad.Servlet.DeleteServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>DeleteServlet</servlet-name>
        <url-pattern>/DeleteServlet</url-pattern>
    </servlet-mapping>
</web-app>

效果展示

在这里插入图片描述

点击文件上传
在这里插入图片描述
点击两次新增附件
在这里插入图片描述

点击删除
在这里插入图片描述
在这里插入图片描述

Submit
在这里插入图片描述

return接着提交

点击下载文件

在这里插入图片描述

点击下载
在这里插入图片描述

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