spring boot——请求与参数校验——Request共享数据(域对象)

注意：只能在一次请求转发中使用。

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

package org.example.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedReader;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Map;
import java.util.Set;

@RestController
public class ParamController
{
    @RequestMapping(value = "/test1")                     //获取请求行数据
    public void test1(HttpServletRequest request)
    {
        System.out.println(request.getMethod());   //获取请求方式；

        System.out.println(request.getContextPath());  //获取虚拟目录

        System.out.println(request.getServletPath());  //获取servlet路径

        System.out.println(request.getQueryString());   //获取请求参数

        System.out.println(request.getRequestURI());   //获取请求URI，部分

        System.out.println(request.getRequestURL());   //获取请求URI，全部


    }


    @RequestMapping(value = "/test2")                   //获取请求头方法一
    public void test2(HttpServletRequest request)
    {
        System.out.println(request.getHeader("accept"));



    }


    @RequestMapping(value = "/test3")                   //获取请求头方法二
    public void test3(HttpServletRequest request)
    {

        Enumeration<String> headerNames = request.getHeaderNames();
        while (headerNames.hasMoreElements())             //读取请求消息头
        {
            String name = headerNames.nextElement();
            String value = request.getHeader(name);

            System.out.println(name + "        "+value);
        }

    }


    @RequestMapping(value = "/test4")
    public void test4(HttpServletRequest request)
    {

        //  http://localhost:8080/test4?a=1&b=2&c=3&c=4


        //返回指定参数名的参数值。
        String a = request.getParameter("a");
        System.out.println(a);

        System.out.println("---------------------------------");


        //返回指定参数名的参数值。
        String c = request.getParameter("c");             //只显示一个
        System.out.println(c);

        System.out.println("---------------------------------");


        //以字符串数组的形式返回指定参数名的所有参数值（HTTP 请求中可以有多个相同参数名的参数）。
        String[] as = request.getParameterValues("c");
        for (String d : as)
        {
            System.out.println(d);
        }

        System.out.println("---------------------------------");

        //以枚举集合的形式返回请求中所有参数名。
        Enumeration<String> asd = request.getParameterNames();
        while (asd.hasMoreElements())
        {
            String name = asd.nextElement();

            System.out.println(name+"     " + request.getParameter(name));
        }



        System.out.println("---------------------------------");



        //用于将请求中的所有参数名和参数值装入一个 Map 对象中返回。


        Map<String,String[]> map = request.getParameterMap();

        Set<String> keySet = map.keySet();


        for (String name : keySet)
        {
            String[] values= map.get(name);

            System.out.println(name);

            for (String value : values)
            {
                System.out.println(value);
            }
        }


    }





    @RequestMapping(value = "/test5")                   //请求转发
    public void test5(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException
    {

        request. getRequestDispatcher("/test1").forward(request,response);

    }






    @RequestMapping(value = "/test8")                   //获取请求体数据
    public void test8(HttpServletRequest request) throws IOException {

        BufferedReader rd = request.getReader();

        String line = null;

        while ((line = rd.readLine()) != null)
        {
            System.out.println(line);
        }

    }






    @RequestMapping(value = "/test10")                   //请求转发
    public void test10(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException
    {
        request.setAttribute("msg","china");

        request. getRequestDispatcher("/test11").forward(request,response);

    }


    @RequestMapping(value = "/test11")                   //请求转发
    public void test11(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException
    {

        System.out.println(request.getAttribute("msg"));

        System.out.println("------------------------------1");

        request.removeAttribute("msg");

        System.out.println("------------------------------2");

        System.out.println(request.getAttribute("msg"));

        System.out.println("------------------------------3");

    }












    @RequestMapping(value = "/test15")
    public String test15(HttpServletResponse response)
    {
        response.setHeader("content-type", "text/html;charset=UTF-8");   //告知浏览器使用什么码表

        //告知客户端不缓存
        response.setHeader("pragma", "no-cache");
        response.setHeader("cache-control", "no-cache");
        response.setDateHeader("expires", 0);

        //添加Cookie
        response.addCookie(new Cookie("cook-001-name" ,"cookie-001-value"));
        response.addCookie(new Cookie("cook-002-name" ,"cookie-002-value"));

        response.setStatus(404);  //我们将状态设置成404
        return "test2";
    }



}