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

╰半夏微凉° 2024-03-30 16:32 76阅读 0赞

注意：只能在一次请求转发中使用。

![2ac7d561772d17319a51c5d3c42bc984.png][]

![9206fc1f0c62a8eca0afb0361808faf5.png][]

![ecddcc55b9f32cbbbc6ad4daef2badd5.png][]

![5ccaf7a80f712998776fe51f3af4be2b.png][]

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";
        }
    
    
    
    }

![bdb8fd2aefe9f841421dc15835961d54.png][]

![55bdd0d219b8231db743400c4ebc5137.png][]

[2ac7d561772d17319a51c5d3c42bc984.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/c0d292e72b2e40eba2365c459b5fe7b4.png
[9206fc1f0c62a8eca0afb0361808faf5.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/908b33903b594b51a0b8bd3d235d7607.png
[ecddcc55b9f32cbbbc6ad4daef2badd5.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/2273e317c84f48e0ab6a658f084d1b4b.png
[5ccaf7a80f712998776fe51f3af4be2b.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/25283e44291d4fcc9c278b7c79a48dc8.png
[bdb8fd2aefe9f841421dc15835961d54.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/a2e955faac414b55b9ab79325047383d.png
[55bdd0d219b8231db743400c4ebc5137.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/9b8f134cec0443ab9e0830ee0ceb5dfd.png