Jsp+Servlet实现文件上传下载 删除上传文件（三）

%@ page contentType="text/html;charset=UTF-8" language="java" %> 
%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> 
html> 
head> 
 title>上传文件列表/title> 
/head> 
body> 
 
h3>文件列表/h3> 
table class="acclist_tab" border="1" bordercolor="#000000" cellspacing="0" cellpadding="2" style="border-collapse:collapse;"> 
 tr> 
  th>文件名/th> 
  th>文件大小（KB）/th> 
  th>操作/th> 
 /tr> 
 c:if test="${not empty accessoryList}"> 
  c:forEach items="${accessoryList}" var="acc"> 
   tr> 
    td>${acc.fileName}/td> 
    td>${acc.fileSize}/td> 
    td>a href="%=request.getContextPath()%>/removeUploadedFile?id=${acc.id}" rel="external nofollow" >删除/a>/td> 
   /tr> 
  /c:forEach> 
 /c:if> 
/table> 
/body> 
/html> 

package util; 
 
import java.io.File; 
 
/** 
 * 文件操作工具类 
 * 
 * @author xusucheng 
 * @create 2017-12-30 
 **/ 
public class FileUtils { 
 public static boolean delete(String path){ 
  File file = new File(path); 
  if(!file.isFile()){ 
   System.out.println("删除失败，文件："+path+"不存在！"); 
   return false; 
  } 
 
  file.delete(); 
 
  return true; 
 } 
} 

package dao.upload; 
 
import entity.upload.EntityAccessory; 
import util.DBUtil; 
 
import java.math.BigDecimal; 
import java.sql.Connection; 
import java.sql.PreparedStatement; 
import java.sql.ResultSet; 
import java.sql.SQLException; 
import java.util.ArrayList; 
import java.util.List; 
 
/** 
 * 附件上传DAO 
 * 
 * @author xusucheng 
 * @create 2017-12-29 
 **/ 
public class AccessoryDao { 
 public static void add(EntityAccessory entity) { 
  Connection conn = DBUtil.getConnection(); 
  String sql = "insert into tbl_accessory(file_name,file_size,file_ext_name,file_path) values(?,?,?,?)"; 
  try { 
   PreparedStatement ps = conn.prepareStatement(sql); 
   ps.setString(1, entity.getFileName()); 
   ps.setDouble(2, entity.getFileSize()); 
   ps.setString(3, entity.getFile_ext_name()); 
   ps.setString(4, entity.getFilePath()); 
   ps.execute(); 
   //conn.commit(); 
 
   DBUtil.close(null, ps, conn); 
  } catch (SQLException e) { 
   e.printStackTrace(); 
  } 
 } 
 
 public static ListEntityAccessory> list() { 
  Connection conn = DBUtil.getConnection(); 
  String sql = "select id,file_name,file_size,file_ext_name,file_path from tbl_accessory"; 
  ListEntityAccessory> accessoryList = new ArrayList>(); 
  try { 
   PreparedStatement ps = conn.prepareStatement(sql); 
   ResultSet rs = ps.executeQuery(); 
 
   while (rs.next()) { 
    EntityAccessory entity = new EntityAccessory(); 
    entity.setId(rs.getInt("id")); 
    entity.setFileName(rs.getString("file_name")); 
    entity.setFileSize(new BigDecimal(rs.getDouble("file_size") / 1024).setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue()); 
    entity.setFile_ext_name(rs.getString("file_ext_name")); 
    entity.setFilePath(rs.getString("file_path")); 
    accessoryList.add(entity); 
   } 
 
   DBUtil.close(rs, ps, conn); 
  } catch (SQLException e) { 
   e.printStackTrace(); 
  } 
 
  return accessoryList; 
 
 } 
 
 public static EntityAccessory load(int id){ 
  Connection conn = DBUtil.getConnection(); 
  PreparedStatement ps=null; 
  ResultSet rs=null; 
  EntityAccessory entity = new EntityAccessory(); 
  String sql = "select id, file_name,file_size,file_ext_name,file_path from tbl_accessory where id=?"; 
  try { 
   ps = conn.prepareStatement(sql); 
   ps.setInt(1,id); 
   rs = ps.executeQuery(); 
   while (rs.next()){ 
    entity.setId(rs.getInt("id")); 
    entity.setFileName(rs.getString("file_name")); 
    entity.setFileSize(rs.getDouble("file_size")); 
    entity.setFile_ext_name(rs.getString("file_ext_name")); 
    entity.setFilePath(rs.getString("file_path")); 
   } 
  } catch (SQLException e) { 
   e.printStackTrace(); 
  }finally { 
   DBUtil.close(rs,ps,conn); 
  } 
 
  return entity; 
 } 
 
 public static void remove(int id) { 
  Connection conn = DBUtil.getConnection(); 
  String sql = "delete from tbl_accessory where id=?"; 
  try { 
   PreparedStatement ps = conn.prepareStatement(sql); 
   ps.setInt(1,id); 
   ps.execute(); 
   //conn.commit(); mysql默认开启了autocommit 
 
   DBUtil.close(null,ps,conn); 
  } catch (SQLException e) { 
   e.printStackTrace(); 
  } 
 } 
} 

package servlet.upload; 
 
import dao.upload.AccessoryDao; 
import entity.upload.EntityAccessory; 
import util.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.IOException; 
 
/** 
 * 删除已上传文件 
 * 
 * @author xusucheng 
 * @create 2017-12-30 
 **/ 
@WebServlet("/removeUploadedFile") 
public class removeUploadedFileServlet extends HttpServlet { 
 @Override 
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
  //String filePath = request.getParameter("filePath"); 
  int fileId = Integer.valueOf(request.getParameter("id")); 
  EntityAccessory entity = AccessoryDao.load(fileId); 
  //删除文件 
  FileUtils.delete(entity.getFilePath()); 
  //删除数据库记录 
  AccessoryDao.remove(fileId); 
 
  //跳回到文件列表页 
  //request.getRequestDispatcher("listUploadedFiles").forward(request, response); 
  response.sendRedirect("listUploadedFiles"); 
 } 
 
 @Override 
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
  doPost(request, response); 
 } 
 
 
}