获取文件的MIME类型

package priv.lwx.javaex.servlet_demo.web.servletcontext;
/**
 * 获取MIME类型
 *
 * @author liaowenxiong
 * @date 2022/1/12 15:34
 */

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.File;
import java.io.IOException;

@WebServlet("/servlet_context_demo01")
public class ServletContextDemo01 extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    this.doPost(request, response);
  }

  @Override
  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    File file = new File("druid.properties");
    String name = file.getName();
    System.out.println(name);
    ServletContext context = this.getServletContext();
    String mimeType = context.getMimeType(name);
    System.out.println(mimeType); // 结果为null，properties文件没有对应的MIME类型
    String name1 = "a.jpeg";
    String mimeType1 = context.getMimeType(name1);
    System.out.println(mimeType1); // 结果为image/jpeg

  }
}