文档管理网页jsp代码

文档管理网页的JSP（JavaServer Pages）代码通常用于创建动态网页，以便用户可以上传、下载、查看和管理文档。以下是一个简单的示例，展示了如何使用JSP和一些常见的Java库来实现基本的文档管理功能。

基础概念

JSP：JavaServer Pages是一种服务器端技术，用于创建动态网页。
Servlet：Java Servlet是用于处理HTTP请求的Java类。
数据库：用于存储文档的元数据（如文件名、上传时间等）。
文件系统：用于实际存储文档文件。

示例代码

1. 创建一个简单的JSP页面用于上传文档

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Document Upload</title>
</head>
<body>
    <h1>Upload Document</h1>
    <form action="upload" method="post" enctype="multipart/form-data">
        <input type="file" name="file" />
        <input type="submit" value="Upload" />
    </form>
</body>
</html>

2. 创建一个Servlet来处理文件上传

import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;

@WebServlet("/upload")
@MultipartConfig(fileSizeThreshold = 1024 * 1024 * 2, // 2MB
                 maxFileSize = 1024 * 1024 * 10,      // 10MB
                 maxRequestSize = 1024 * 1024 * 50)   // 50MB
public class FileUploadServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private static final String UPLOAD_DIRECTORY = "uploads";

    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        // gets absolute path of the web application
        String applicationPath = request.getServletContext().getRealPath("");
        // constructs path of the directory to save uploaded file
        String uploadFilePath = applicationPath + File.separator + UPLOAD_DIRECTORY;

        // creates the save directory if it does not exists
        File fileSaveDir = new File(uploadFilePath);
        if (!fileSaveDir.exists()) {
            fileSaveDir.mkdirs();
        }

        try {
            Part filePart = request.getPart("file");
            String fileName = getFileName(filePart);

            String filePath = uploadFilePath + File.separator + fileName;
            filePart.write(filePath);

            response.getWriter().println("File " + fileName + " has uploaded successfully!");
        } catch (Exception e) {
            response.getWriter().println("There was an error: " + e.getMessage());
        }
    }

    private String getFileName(Part part) {
        for (String content : part.getHeader("content-disposition").split(";")) {
            if (content.trim().startsWith("filename")) {
                return content.substring(content.indexOf('=') + 1).trim().replace("\"", "");
            }
        }
        return null;
    }
}

3. 创建一个JSP页面用于列出所有文档

<%@ page import="java.io.*, java.util.*" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Document List</title>
</head>
<body>
    <h1>Document List</h1>
    <ul>
        <% 
        String uploadPath = application.getRealPath("") + File.separator + "uploads";
        File uploadDir = new File(uploadPath);
        if (uploadDir.exists() && uploadDir.isDirectory()) {
            for (File file : uploadDir.listFiles()) {
        %>
                <li><a href="uploads/<%= file.getName() %>"><%= file.getName() %></a></li>
        <% 
            }
        }
        %>
    </ul>
</body>
</html>