JSP文件上传

最新推荐文章于 2025-11-27 13:57:04 发布

最新推荐文章于 2025-11-27 13:57:04 发布 · 133 阅读

文章标签：

本文展示了一个基于Java实现的文件上传功能，并将其与数据库进行交互，实现了文件的存储和检索。通过使用Apache Commons FileUpload库，实现了MultipartFile的解析与上传文件的处理。同时，展示了如何将上传的文件名存储到数据库中，并提供了数据库查询来展示已上传的文件信息。

<%@ page language="java" pageEncoding="UTF-8"%> <%@page import="java.sql.ResultSet"%> <%@page import="java.io.File"%> <%@page import="org.apache.commons.fileupload.servlet.ServletFileUpload"%> <%@page import="org.apache.commons.fileupload.disk.DiskFileItemFactory"%> <%@page import="java.util.List"%> <%@page import="org.apache.commons.fileupload.FileItem"%> <%@page import="org.apache.commons.fileupload.FileUploadException"%> <%@page import="utils.ImageFileUpload"%> <% String msg = ""; ResultSet rs = null; ImageFileUpload ifu = new ImageFileUpload(); try { if (ServletFileUpload.isMultipartContent(request)) { DiskFileItemFactory dfifactory = new DiskFileItemFactory(); // 设置最多只允许在内存中存储的数据 dfifactory.setSizeThreshold(100 * 1204); // 设置一旦文件大小超过getSizeThreshold()的值时数据存放在硬盘的目录 dfifactory.setRepository(new File("C:\\Java\\temp")); ServletFileUpload sfu = new ServletFileUpload(dfifactory); List<FileItem> list = sfu.parseRequest(request); for (FileItem fi : list) { if (!fi.isFormField()) { if (fi.getSize() != 0) { if (fi.getSize() > (400 * 1024)) { msg = "文件大小不能超过400kb"; } else { File f = new File(fi.getName()); // 设置上传文件的目录 String destSavePath = getServletContext() .getRealPath(getServletInfo()) + "\\images\\" + f.getName(); // 将文件名保存至数据库 if (ifu.saveFilename(f.getName())) { // 将文件写如服务器目录 if (ifu.saveImage(fi, destSavePath)) { msg = "文件上传成功"; } } } } } fi.delete(); } } } catch (FileUploadException e) { e.printStackTrace(); } // 显示当前数据库中的图片信息 rs = ifu.getAll(); %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>文件上传演示</title> </head> <body> <h1> 文件上传演示 </h1> <form action="index.jsp" method="post" enctype="multipart/form-data"> <input type="text" name="name" value="abc"> <br> <input type="file" name="imagename"> <br> <input type="submit" name="addImage" value="提交"> </form> <%=msg%> <hr> <table border="1"> <tr> <td>id</td> <td>Image</td> </tr> <% if (rs != null){ while(rs.next()){ %> <tr> <td><%=rs.getString(1)%></td> <td><img src="images/<%=rs.getString(2)%>" width="70"></td> </tr> <% } } %> </table> </body> </html>

CREATE TABLE [dbo].[image]( [id] [int] IDENTITY(1,1) NOT NULL, [image] [varchar](50) NULL, CONSTRAINT [PK_image] PRIMARY KEY CLUSTERED ( [id] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY]

package utils; import java.io.File; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import org.apache.commons.fileupload.FileItem; public class ImageFileUpload { private Connection conn = null; public boolean saveFilename(String filename) { boolean flag = false; try { if (conn == null) conn = getConnection(); PreparedStatement pstmt = conn .prepareStatement("insert into image values(?)"); pstmt.setString(1, filename); pstmt.execute(); flag = true; } catch (SQLException e) { e.printStackTrace(); } return flag; } public boolean saveImage(FileItem item, String path) { boolean flag = false; try { item.write(new File(path)); flag = true; } catch (Exception e) { e.printStackTrace(); } return flag; } private Connection getConnection() { try { Class.forName("net.sourceforge.jtds.jdbc.Driver"); conn = DriverManager.getConnection( "jdbc:jtds:sqlserver://localhost:1433/test", "sa", ""); } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (SQLException e) { e.printStackTrace(); } return conn; } public ResultSet getAll() { ResultSet rs = null; try { if (conn == null) conn = getConnection(); PreparedStatement pstmt = conn .prepareStatement("select * from image"); rs = pstmt.executeQuery(); } catch (SQLException e) { e.printStackTrace(); } return rs; } }