package gz.itcast.b_request;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 RequestDemo1 extends HttpServlet { /** * The doGet method of the servlet.
* * 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 { //t1(request); /* * 3.2 請求頭 / String host = request.getHeader("Host"); //根據頭名稱的到頭的內容 System.out.println(host); //遍歷所有請求頭 Enumeration enums = request.getHeaderNames(); //得到所有的請求頭名稱列表 while(enums.hasMoreElements()){//判斷是否有下一個元素 String headerName = enums.nextElement(); //取出下一個元素 String headerValue = request.getHeader(headerName); System.out.println(headerName+":"+headerValue); } } private void t1(HttpServletRequest request) { /* * 3.1 請求行 格式：（GET /day09/hello HTTP/1.1） */ System.out.println("請求方式："+request.getMethod());//請求方式 System.out.println("URI:"+request.getRequestURI());//請求資源 System.out.println("URL:"+request.getRequestURL()); System.out.println("http協議版本："+request.getProtocol());//回頭tp協議 }}為什麼我在浏覽器發送http://localhost:8080/day09/RequestDemo1請求，在myeclipse控制台看不到System.out.println("請求方式："+request.getMethod());System.out.println("URI:"+request.getRequestURI());System.out.println("URL:"+request.getRequestURL());System.out.println("http協議版本："+request.getProtocol());輸出的數據信息
問題已經解決，是由於在本機控制台啟動的tomcat服務器，然後在浏覽器發送的請求，所以請求信息是在本機控制台上顯示的，eclipse 控制台就顯示不了
