request获取请求头消息

╰半橙微兮° 2022-06-07 23:37 211阅读 0赞

Java代码：

package com.lin.servlet;
    
    import java.io.IOException;
    import java.io.PrintWriter;
    import java.util.Enumeration;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    public class TestHttp extends HttpServlet { 
    
        /** * Constructor of the object. */
        public TestHttp() {
            super();
        }
    
        /** * Destruction of the servlet. <br> */
        public void destroy() {
            super.destroy(); // Just puts "destroy" string in log
            // Put your code here
        }
    
        /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */
        public void doGet(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
    
            response.setContentType("text/html");
            response.setCharacterEncoding("UTF-8");
            PrintWriter out = response.getWriter();
            out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
            out.println("<HTML>");
            out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
            out.println(" <BODY>");
            out.println(" <center>");
            out.println(" <h2>请求头信息列表<h2>");
            out.println(" <table border=1>");
            out.println(" <tr><th>名字</th><th>值</th></tr>");
            //返回请求头信息名字集合
            Enumeration enums=request.getHeaderNames();
            while(enums.hasMoreElements()){
                String headName=(String) enums.nextElement();
                out.println(" <tr>");
                out.println(" <td>"+headName+"</td>");
                out.println(" <td>"+request.getHeader(headName)+"</td>");
                out.println(" </tr>");
            }
            out.println(" </table>");
            out.println(" <hr>");
            out.println("Method: "+request.getMethod()+"<br>");
            out.println("Request URL: "+request.getRequestURI()+"<br>");
            out.println("Protocool: "+request.getProtocol()+"<br>");
            out.println("PathInfo: "+request.getPathInfo()+"<br>");
            out.println("Remote Address: "+request.getRemoteAddr()+"<br>");
            String path=request.getContextPath();
            String basePath=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getRequestURI();
            out.println("path: "+path+"<br>");
            out.println("basePath: "+basePath+"<br>");
            out.println(" </center>");
            out.println(" </BODY>");
            out.println("</HTML>");
            out.flush();
            out.close();
        }
    
        /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */
        public void doPost(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
    
            this.doGet(request, response);
        }
    
        /** * Initialization of the servlet. <br> * * @throws ServletException if an error occurs */
        public void init() throws ServletException {
            // Put your code here
        }
    
    }

截图：

![这里写图片描述][SouthEast]

[SouthEast]: /images/20220608/6f2a2c6d4d6143cdba08e10801e8ad51.png