J250913/http-servlet-demo/src/com/sf/web/servlet/MyRequestServlet.java

package com.sf.web.servlet;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Map;

@WebServlet("/request/*")
public class MyRequestServlet extends HttpServlet {






    /**
     * http://localhost:8080/request
     * 我希望访问
     * /request/order的时候在控制台当中打印访问订单信息
     * /request/product 我希望看到访问商品信息
     */

    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//        System.out.println("请求方式:"+req.getMethod());
//        System.out.println("资源标识符:"+ req.getRequestURI());
//        System.out.println("请求url:"+ req.getRequestURL());
//        System.out.println("协议信息:"+req.getProtocol());
//        System.out.println("上下文路径:"+req.getContextPath());
//        String url = req.getRequestURI();
//        if(url.contains("/order")){
//            System.out.println("访问订单信息");
//        }else if(url.contains("/product")){
//            System.out.println("访问商品信息");
//        }else{
//            System.out.println("访问其他的信息");
//        }

//        System.out.println(req.getHeader("name"));
        System.out.println("根据key 获取参数值"+req.getParameter("name"));
        for (String hobby : req.getParameterValues("hobby")) {
            System.out.println("爱好信息:"+ hobby);
        }

        // 获取参数名
        Enumeration<String> en = req.getParameterNames();
        while (en.hasMoreElements()){
            System.out.println(en.nextElement());
        }
        // 把参数信息放到map 中
        Map<String, String[]> map = req.getParameterMap();
        for (Map.Entry<String, String[]> stringEntry : map.entrySet()) {
            System.out.println(stringEntry.getKey() +"-"+ stringEntry.getValue()[0]);
        }
    }
}