文件在浏览器以附件的形式打开

点击查看代码 
package servlet;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet("/DownloadServlet")
public class DownloadServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //获取参数
        String parameter = req.getParameter("fileName");
        //获得真实路径
        ServletContext context = req.getServletContext();
        String realPath = context.getRealPath("/img/" + parameter);
        //设置响应头
        //先告诉浏览器他的类型（MimeType）
        String mimeType = context.getMimeType(parameter);
        resp.setHeader("content-type",mimeType);
        //在以附件的形式打开
        resp.setHeader("content-disposition","attachment;filename="+parameter);
        //创建字节输入流
        FileInputStream fis = new FileInputStream(realPath);
        //输入输出对拷
        ServletOutputStream ops = resp.getOutputStream();
        byte[] bt = new byte[1024*8];
        int len=0;
        while((len=fis.read(bt))!=-1){
            ops.write(bt,0,len);
        }
        fis.close();
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doPost(req,resp);
    }
}
点击查看代码 
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
        <a href="/Spring_MVC/DownloadServlet?fileName=1.png">图片1</a>
</body>
</html>
posted @ 2025-05-26 22:35  lfqyj  阅读(4)  评论(0)    收藏  举报