如何使网页内容可供客户端下载答案

【问题标题】：How can i make the content of a webpage downloadable for the client如何使网页内容可供客户端下载
【发布时间】：2023-03-20 09:15:01
【问题描述】：

我正在处理一个项目，但我找不到一种方法来使从我的数据库中打印出表格的页面内容可下载。我希望有一个按钮，让客户有机会以 pdf 或 csv 的形式下载表格的内容。这是servlet fo

package bacit.web.bacit_web;

import java.io.*;
import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import java.sql.*;


@WebServlet(name = "BookingHistorikk", value = "/BookingHistorikk")
public class GetBookingHistorikk extends HttpServlet
{
    public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException
    {
        PrintWriter out = res.getWriter();
        res.setContentType("text/html");
        out.println("<html><body>");
        try
        {
            Class.forName("org.mariadb.jdbc.Driver");
            Connection con = DriverManager.getConnection("jdbc:mariadb:**********", "root", "pass");
            Statement stmt = con.createStatement();
            ResultSet rs = stmt.executeQuery("select * from BOOKING");
            out.println("<table style=text-align:center border=1 width=50% height=10% >");
            out.println("<tr><th>Start Dato</th><th>Slutt Dato</th><th>Kommentar</th><th>Levert</th><th>Total Pris</th></tr>");
            while (rs.next())
            {
                Date startDate = rs.getDate("StartDate");
                Date endDate = rs.getDate("EndDate");
                String cmnt = rs.getString("Cmnt");
                Boolean isDelivered = rs.getBoolean("IsDelivered");
                int totalPrice = rs.getInt("TotalPrice");
                out.println("<tr><td>" + startDate + "</td><td>" + endDate + "</td><td>" + cmnt + "</td><td>" + isDelivered + "</td><td>" + totalPrice + "</td></tr>");
            }
            out.println("</table>");
            out.println("</html></body>");
            con.close();
        }
        catch (Exception e)
        {
            out.println("error");
        }
    }
}

【问题讨论】：

标签： java servlets download download-manager

【解决方案1】：

你需要在这里做两件事......

创建 CSV 文件。
在HttpServletResponse 的帮助下将其发送给用户。

您可以像这样创建 CSV 文件内容：

String getMyCsvFileAsString() {
    StringBuilder sb = new StringBuilder();
      sb.append("id");
      sb.append(',');
      sb.append("Name");
      sb.append('\n');

      sb.append("1");
      sb.append(',');
      sb.append("Prashant Ghimire");
      sb.append('\n');

      writer.write(sb.toString());
}

然后你可以像这样将它附加到请求中：

public void doGet(HttpServletRequest request, HttpServletResponse response)
{
    response.setContentType("text/csv");
    response.setHeader("Content-Disposition", "attachment; filename=\"myCsvFile.csv\"");
    try
    {
        OutputStream outputStream = response.getOutputStream();
        // Get CSV file as string
        String outputResult = getMyCsvFileAsString();
        
        outputStream.write(outputResult.getBytes());
        outputStream.flush();
        outputStream.close();
    }
    catch(Exception e)
    {
        System.out.println(e.toString());
    }
}

【讨论】：