servlet 实现下载文件

it2025-06-24 19

servlet:

public class UpAndDownServlet extends HttpServlet {

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html");String type = request.getParameter("type");

if("down".equals(type)){File file = new File("D:\\test\\44444.png");FileInputStream is = new FileInputStream(file);BufferedInputStream bs = new BufferedInputStream(is);ServletOutputStream os = response.getOutputStream();BufferedOutputStream bos = new BufferedOutputStream(os);String date = new SimpleDateFormat("yyyy-HH-dd").format(new Date());String fileName = date + ".jpg";response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");byte[] len = new byte[1024*2];int read = 0;while((read=is.read(len)) != -1){bos.write(len, 0, read);System.out.println("read---"+read);}bos.flush();bos.close();is.close();}

}

怎样实现文件下载要实现文件下载，我们仅仅须要设置两个特殊的对应头，它们是什么头？假设文件名称带中文，该怎样解决？两个特殊的对应头：----Content-Type: application/octet-stream----Content-Disposition: attachment;filename=aaa.zip比如：response.setContentType("image/jpeg");response.setHeader("Content- Disposition","attachment;filename=Bluehills.jpg");

页面： <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>down</title> </head> <body> <form action="servlet/UpAndDownServlet?type=down" method="post"> <input type="submit" value="下载"> </form> </body> </html>

转载于:https://www.cnblogs.com/bhlsheji/p/5103533.html

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