获取文件mime类型

package cn.itcast.web.servlet;

import java.io.IOException;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//通过servletContext获取文件的mime类型
public class ServletDemo8 extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String filename = "1.jpg";

        ServletContext context = this.getServletContext();
        System.out.println(context.getMimeType(filename));

        response.setHeader("content-type", "image/jpeg");

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request, response);
    }

}