Request_获取请求数据_代码案例和Request_Request获取请求头数据

URL：统一资源定位符：Http://localhost/day14/demo1      中华人民共和国

URL：统一资源标示符：/day14/demo1                              共和国

 

java代码

@WebServlet("/requestDemo1")
public class ServletDome5 extends HttpServlet {


    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //获取请求方式GET
        String method = req.getMethod();
        System.out.println(method);
        //获取虚拟路径
        String contextPath = req.getContextPath();
        System.out.println(contextPath);
        //获取Servlet路径
        String servletPath = req.getServletPath();
        System.out.println(servletPath);
        //获取get方式请求参数
        String queryString = req.getQueryString();
        System.out.println(queryString);
        //
        String requestURI = req.getRequestURI();
        StringBuffer requestURL = req.getRequestURL();
        System.out.println(requestURI);
        System.out.println(requestURL);
        //获取协议及版本：http:/1.1
        String protocol = req.getProtocol();
        System.out.println(protocol);
        //获取客户机的IP地址
        String remoteAddr = req.getRemoteAddr();
        System.out.println(remoteAddr);

    }

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Request_Request获取请求头数据

　　方法：

　　　　String getHeader（String name）：通过请求头的名称获取请求头的值

　　　　Enumeration<String> getHeaderNames()：获取所有的请求名称

Enumeration<String> headerNames = req.getHeaderNames();
        while (headerNames.hasMoreElements()){
            String s = headerNames.nextElement();
            String header = req.getHeader(s);
            System.out.println(s+"---"+header);
        }

 

 

        String referer = req.getHeader("referer");
        System.out.println(referer);

        if (referer!=null){
            if (referer.contains("/day14")){
//                System.out.println("播放电影....");
                  resp.setContentType("text/html;charset=utf-8");
                  resp.getWriter().write("播放电影");
            }else {
//                System.out.println("想看电影吗");
                  resp.setContentType("text/html;charset=utf-8");
                  resp.getWriter().write("播放电影");
            }
        }

 

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Enumeration<String> headerNames = req.getHeaderNames();
        while (headerNames.hasMoreElements()){
            String s = headerNames.nextElement();
            String header = req.getHeader(s);
            System.out.println(s+"---"+header);
        }