#1.Request

package com.tcb.servlet;import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;/*** 目的：總結(jié)HttpRequest中常用的方法*/ public class Servlet01Request extends HttpServlet {private static final long serialVersionUID = 1L;public Servlet01Request() {super();// TODO Auto-generated constructor stub}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//一、路徑問題：//1.上下文路徑: /TCB-Request01 當前項目目錄(重要的)String contextPath=request.getContextPath();System.out.println("======contextPath======="+contextPath);//2.uri--統(tǒng)一資源標識符: /TCB-Request01/Servlet01 服務器上的路徑String uri=request.getRequestURI();System.out.println("======uri======="+uri);//3.url--統(tǒng)一資源定位符: http://localhost:8080/TCB-Request01/Servlet01String url=request.getRequestURL().toString();System.out.println("======url======="+url);////統(tǒng)一資源標識符=http://localhost/資源標識符//訪問的地址：統(tǒng)一資源定位符//二、提交方式--GET/POST 默認是GET方式，此處運行結(jié)果為GETString method=request.getMethod();System.out.println("======method======="+method);//三、服務器內(nèi)部--根據(jù)需求設(shè)置要傳的值，并在其他頁面根據(jù)Request獲取值--利用的Request是域?qū)ο蟮奶匦?#xff0c;進行頁面見傳值//注意：區(qū)別于Parameterrequest.setAttribute("key", "value");request.getAttribute("");//根據(jù)名稱獲取指定傳的值request.getAttributeNames();//獲取所有的傳值的名稱//四、客戶端--獲取客戶端傳來的參數(shù)Parameter--比如get方式中地址欄問號？后的username=Jane&password=123//1.根據(jù)指定參數(shù)名稱獲取值request.getParameter("");//值為單個時request.getParameterValues("");//值為多個時，返回值為數(shù)組--比如愛好hobby，一個參數(shù)名下對應多個值//2.獲取所有參數(shù)名稱request.getParameterNames();//3.獲取所有參數(shù)，并一鍵值對（key=value）的形式存在map集合中request.getParameterMap();//五、獲得Cookie和sessionrequest.getCookies();request.getSession();request.getRequestedSessionId();//獲取session的id，每個session都會在客戶端生成一個唯一的id//六、設(shè)置編碼方式request.setCharacterEncoding("utf-8");//七、轉(zhuǎn)發(fā)--地址欄不變，請求一次request.getRequestDispatcher("要跳轉(zhuǎn)到的頁面地址").forward(request, response);request.getRequestDispatcher("要跳轉(zhuǎn)到的頁面地址").include(request, response);//包含，功能與forward類似，不常用}protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubdoGet(request, response);}}

#2.Response

package com.tcb.servlet;import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;/*** 目的：總結(jié)HttpResponse中常用的方法*/ public class Servlet02Response extends HttpServlet {private static final long serialVersionUID = 1L;public Servlet02Response() {super();// TODO Auto-generated constructor stub}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//一、設(shè)置編碼--當然也可以獲取編碼方式，不常用就不一一列出了//設(shè)置響應輸出的編碼方式，不常用，一般用下面那個response.setCharacterEncoding("utf-8");//告訴瀏覽器輸出的文本是html，讓瀏覽器按照html方式進行解析，并且HTML的文件的編碼格式是utf-8//因為在進行輸出時可以寫html標簽，若沒有設(shè)置為如下格式，就不能解析html標簽//比如：response.getWriter().write("<a href='http://www.baidu.com' >百度<a/>");response.setContentType("text/html;charset=utf-8");//二、輸出流response.getWriter();//字符流response.getOutputStream();//字節(jié)流//三、添加CookieCookie cookie=new Cookie("username", "用戶名");response.addCookie(cookie);//四、設(shè)置請求頭--常用于文件下載response.setHeader("content-type", "image/png");//設(shè)置請求頭內(nèi)容類型，為png類型圖片//content-disposition內(nèi)容配置//attachment代表附件的意思 保存下載內(nèi)容response.setHeader("content-disposition", "attachment;filename="+"文件名稱，帶擴展名");//setHeader實現(xiàn)刷新//3s后刷新，只刷新一次--其中3指代時間 所以setHeader也可以實現(xiàn)頁面跳轉(zhuǎn)response.setHeader("refresh", "3;url=刷新跳轉(zhuǎn)的頁面地址，可以是jsp，HTML，Servlet等");response.setIntHeader("refresh", 3);//目的：循環(huán)是刷新,每隔3s去刷新//五、重定向--地址欄變化，請求兩次response.sendRedirect("要跳轉(zhuǎn)到的頁面地址，一般用絕對路徑");}protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubdoGet(request, response);}}

#3.Cookie

package com.tcb.servlet;import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;/*** 目的：總結(jié)Cookie中常用的方法*/ public class Servlet03Cookie extends HttpServlet {private static final long serialVersionUID = 1L;public Servlet03Cookie() {super();// TODO Auto-generated constructor stub}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//獲取Cookierequest.getCookies();//創(chuàng)建和添加CookieCookie cookie=new Cookie("", "");//參數(shù)1：參數(shù)名 參數(shù)2：參數(shù)值response.addCookie(cookie);//設(shè)置Cookie有效時間和路徑cookie.setMaxAge(0);//設(shè)置Cookie有效時間，單位是秒 值為0時，表示Cookie失效（默認） cookie.setPath("uri,路徑");//設(shè)置Cookie路徑//獲取Cookie的值和名以及當前路徑cookie.getName();cookie.getValue();cookie.getPath();}protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubdoGet(request, response);}}

#4.Session

package com.tcb.servlet;import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession;/*** 目的：總結(jié)Session中常用的方法*/ public class Servlet04Session extends HttpServlet {private static final long serialVersionUID = 1L;public Servlet04Session() {super();// TODO Auto-generated constructor stub}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//創(chuàng)建sessionHttpSession session=request.getSession();//給session賦值以及獲取值--參數(shù)1：參數(shù)名 參數(shù)2：參數(shù)值session.setAttribute("key", "value");session.getAttribute("");//根據(jù)傳值的名稱獲取值session.getAttributeNames();//獲取session中存的所有值的名稱//設(shè)置session有效時間，單位秒session.setMaxInactiveInterval(5);}protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubdoGet(request, response);}}

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