HttpServletRequest接口学习

package com.hongdian;

import java.util.Enumeration;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author yjmao
 * @描述 HttpServletRequest接口学习
 * @继承于 ServletRequest
 */
@WebServlet(name = "SpanningTreeServlet", urlPatterns = {"/SpanningTreeServlet.html"})
public class HttpServletRequestLearn extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //authType(request);
        //getContextPath(request); 
        //getCookies(request);
        //getDateHeader(request);
        //getHeader(request);
        //getHeaderNames(request);
        //getHeaders(request);
        //getIntHeader(request);
        //getMethod(request);
        //getPathInfo(request); 
        //getPathTranslated(request); 
        //getQueryString(request); 
        //getRemoteUser(request); 
        //getRequestedSessionId(request); 
        //getRequestURI(request);
        //getRequestURL(request); 
        //getServletPath(request);
        //getSession(request);
        //getSessionBollean(request);
        //getUserPrincipal(request);
        //isRequestedSessionIdFromCookie(request); 
        //isRequestedSessionIdFromUrl(request) 
        //isRequestedSessionIdFromURL(request);
        //isRequestedSessionIdValid(request) ;
        //isUserInRole(request); 
        System.err.println("GET进来啦！");
    }
    
    
     /*
     * isRequestedSessionIdFromURL():返回一个布尔值，表示经过身份验证的用户是否包含在指定的逻辑“角色”。
     *       
     */
    public static void isUserInRole(HttpServletRequest request) {
        Boolean isUserInRole = request.isUserInRole("mao");
        System.out.println("isUserInRole = " + isUserInRole);
    }
     /*
     * isRequestedSessionIdFromURL():检查请求的会话ID是否仍然有效。
     *       
     */
    public static void isRequestedSessionIdValid(HttpServletRequest request) {
        Boolean isRequestedSessionIdValid = request.isRequestedSessionIdValid();
        System.out.println("isRequestedSessionIdValid = " + isRequestedSessionIdValid);
    }
    /*
     * isRequestedSessionIdFromURL():检查请求的会话ID来作为请求URL的一部分。
     *       
     */
    public static void isRequestedSessionIdFromURL(HttpServletRequest request) {
        Boolean isRequestedSessionIdFromURL = request.isRequestedSessionIdFromURL();
        System.out.println("isRequestedSessionIdFromURL = " + isRequestedSessionIdFromURL);
    }
    /*
     * isRequestedSessionIdFromCookie():检查请求的会话ID作为一个cookie。
     *       
     */
    public static void isRequestedSessionIdFromCookie(HttpServletRequest request) {
        Boolean isRequestedSessionIdFromCookie = request.isRequestedSessionIdFromCookie();
        System.out.println("isRequestedSessionIdFromCookie = " + isRequestedSessionIdFromCookie);
    }
    /*
     * getSession():返回与此请求关联的HttpSession中，如果没有当前会话，并创建是真实的，则返回一个新的会话。
     *       
     */
    public static void getSessionBollean(HttpServletRequest request) {
        HttpSession getSession = request.getSession(true);
        String getId = getSession.getId();
        System.out.println("getId = " + getId);
    }
    
     /*
     * getSession():返回与此请求关联的当前会话，或者如果请求没有会话，创建一个。
     *       
     */
    public static void getSession(HttpServletRequest request) {
        HttpSession getSession = request.getSession();
        String getId = getSession.getId();
        System.out.println("getId = " + getId);
    }
    
    /*
     * getServletPath():返回调用servlet的请求的URL的一部分。
     *       如：/SpanningTreeServlet.html
     */
    public static void getServletPath(HttpServletRequest request) {
        String getServletPath = request.getServletPath();
        System.out.println("getServletPath = " + getServletPath);
    }

    /*
     * getRequestURL():重建的要求，使客户端使用的URL。
     *       如：http://localhost:8088/LargeAmountOfDataSpanningTree/SpanningTreeServlet.html
     */
    public static void getRequestURL(HttpServletRequest request) {
        StringBuffer getRequestURL = request.getRequestURL();
        System.out.println("getRequestURL = " + getRequestURL.toString());
    }

    /*
     * getRequestURI():返回此请求的URL的一部分从HTTP请求中的第一行中的查询字符串的协议名称。
     *       如：/LargeAmountOfDataSpanningTree/SpanningTreeServlet.html
     */
    public static void getRequestURI(HttpServletRequest request) {
        String getRequestURI = request.getRequestURI();
        System.out.println("getRequestURI = " + getRequestURI);
    }

    /*
     * getRequestedSessionId():返回指定的客户端的会话ID。
     *  
     */
    public static void getRequestedSessionId(HttpServletRequest request) {
        String getRequestedSessionId = request.getRequestedSessionId();
        System.out.println("getRequestedSessionId = " + getRequestedSessionId);
    }

    /*
     * getMethod():返回这个请求的HTTP方法的名称，例如，GET，POST或PUT。
     *  
     */
    public static void getMethod(HttpServletRequest request) {
        String getMethod = request.getMethod();
        System.out.println("getMethod = " + getMethod);
    }

    /*
     * getIntHeader(String name):返回指定的请求头为一个int值。
     *  参数name:请求头中的参数
     * 不是很懂
     */
    public static void getIntHeader(HttpServletRequest request) {
        int enums = request.getIntHeader("mm");
        System.out.println("enums = " + enums);
    }

    /*
     * getHeaders(String name):返回一个String对象的枚举指定的请求标头的所有值。
     *  参数name:请求头中的参数
     */
    public static void getHeaders(HttpServletRequest request) {
        Enumeration enums = request.getHeaders("Accept-Charset");
        while (enums.hasMoreElements()) {
            System.out.println("******head=" + enums.nextElement() + "************");
        }
    }

    /*
     * getHeaderNames():返回一个枚举这个请求包含所有的头名。
     *  
     */
    public static void getHeaderNames(HttpServletRequest request) {
        Enumeration enums = request.getHeaderNames();
        String str = null;
        while (enums.hasMoreElements()) {
            str = enums.nextElement().toString();
            System.out.print(str + ":");
            System.out.println(request.getHeader(str));
            Enumeration a = request.getHeaders(str);
            while (a.hasMoreElements()) {
                System.out.println("******head=" + a.nextElement() + "************");
            }
        }
    }

    /*
     * getHeader(String name):返回值作为一个String指定的请求头。
     *   参数name:请求头中的参数，
     * 如：
     Accept-Charset:GBK,utf-8;q=0.7,*;q=0.3
     Accept-Encoding:gzip,deflate,sdch
     Accept-Language:zh-CN,zh;q=0.8
     Connection:keep-alive
     Cookie:JSESSIONID=461DB37360713AFBFB9E0B50FF716191
     Host:localhost:8088
     Referer:http://localhost:8088/LargeAmountOfDataSpanningTree/
     User-Agent:Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11
     X-Requested-With:XMLHttpRequest
     */
    public static void getHeader(HttpServletRequest request) {
        String getHeader = request.getHeader("Accept-Charset");
        System.err.println("getHeader = " + getHeader);
        String Host = request.getHeader("Host");
        System.err.println("Host = " + Host);
    }

    /*
     * getCookies():返回一个数组，包含所有客户端发送申请的Cookie对象。
     *      
     */
    public static void getCookies(HttpServletRequest request) {
        Cookie[] getCookies = request.getCookies();
        int i = 0;
        for (Cookie cook : getCookies) {
            i++;
            System.err.println("第" + i + "个cook = " + cook.getName() + ";value = " + cook.getValue());
        }
    }

    /*
     * getContextPath():指示上下文请求的URI
     *      如http://localhost:8088/LargeAmountOfDataSpanningTree/
     *      返回的就是/LargeAmountOfDataSpanningTree
     */
    public static void getContextPath(HttpServletRequest request) {
        String getContextPath = request.getContextPath();
        System.err.println("getContextPath = " + getContextPath);
    }

    /*
     * authType():返回的身份验证方案，用于保护的servlet的名称。
     */
    public static void authType(HttpServletRequest request) {
        String authType = request.getAuthType();
        System.err.println("authType = " + authType);
    }

    /**
     * ***************************不是很清楚怎么样的***********************************************
     */
     /*
     * getUserPrincipal():返回一个java.security.Principal对象，它包含当前经过身份验证的用户的名称。
     *       
     */
    public static void getUserPrincipal(HttpServletRequest request) {
        java.security.Principal pp = request.getUserPrincipal();
        System.err.println("pp = " + pp);
    }
    
    /*
     * isRequestedSessionIdFromCookie():检查请求的会话ID作为一个cookie。
     *       方法已经过时
     */
    public static void isRequestedSessionIdFromUrl(HttpServletRequest request) {
        Boolean isRequestedSessionIdFromUrl = request.isRequestedSessionIdFromUrl();
        System.out.println("isRequestedSessionIdFromUrl = " + isRequestedSessionIdFromUrl);
    }
    
    /*
     * getPathTranslated():提出这个要求时，客户端发送的URL返回任何额外的路径信息。
     *  
     */
    public static void getPathTranslated(HttpServletRequest request) {
        String getPathTranslated = request.getPathTranslated();
        System.out.println("getPathTranslated = " + getPathTranslated);
    }

    /*
     * getPathInfo():提出这个要求时，客户端发送的URL返回任何额外的路径信息。
     *  
     */
    public static void getPathInfo(HttpServletRequest request) {
        String getPathInfo = request.getPathInfo();
        System.out.println("getPathInfo = " + getPathInfo);
    }
    /*
     * getQueryString():返回的查询字符串中包含请求的URL路径后。
     *  
     */

    public static void getQueryString(HttpServletRequest request) {
        String getQueryString = request.getQueryString();
        System.out.println("getQueryString = " + getQueryString);
    }

    /*
     * getRemoteUser():提出这个要求返回登录的用户，如果用户已通过身份验证，或者如果用户未通过身份验证，则返回null。
     *  
     */
    public static void getRemoteUser(HttpServletRequest request) {
        String getRemoteUser = request.getRemoteUser();
        System.out.println("getRemoteUser = " + getRemoteUser);
    }
    /*
     * getDateHeader(String name):返回指定的请求头作为一项长期的价值，代表一个日期对象的价值。
     *   注明：不是很懂
     */

    public static void getDateHeader(HttpServletRequest request) {
        long tie = request.getDateHeader("mm");
        System.err.println("tie = " + tie);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //authType(request);
        getMethod(request);
        System.err.println("Put进来啦！");
    }
}