从数据中下载数据到csv文件_数据下载csv-优快云博客

本文链接：https://blog.youkuaiyun.com/d80/article/details/47407

此博客展示了一段Java代码，实现了CSV文件的下载功能。代码通过HttpServlet类，在doPost方法中设置输出格式，将数据写入输出流，最终实现文件下载。同时对可能出现的异常进行了捕获处理。

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import java.sql.*;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class DownLoad extends HttpServlet{
    public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
        doPost(request,response);
    }
    public void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
        System.out.println("======DownLoad begin=====");
        try{
            String fileName="dddd.csv";
            OutputStream outs=response.getOutputStream();
            DataOutputStream dateOut = new DataOutputStream(outs);
            //设置输出的格式
            response.reset();
            response.setContentType("bin");
            response.addHeader("Content-Disposition",
                               "attachment; filename=/"" + fileName + "/"");

            for (int i = 0; i < 10; i++) {
                dateOut.writeBytes(i+"/r/n");
            }
            dateOut.close();
            outs.close();
        }catch(Exception ex){
            ex.printStackTrace();
        }
        System.out.println("======DownLoad end=====");
    }
}