一、Jsp
1. 指令：
<%@ page language="java" import="java.*" contextType="text/html" charset="utf-8" pageEncoding="utf-8" %>
<%@ include file="url" %>
<%@ taglib uri="" prefix="" %>
2. 动作（部分）：
<jsp:useBean id="对象名" class="类名（绝对路径）" scope="page"/>
<jsp:setProperty name="id" property="*"/> //与request对象中属性名相同的属性获得相应的值
或<jsp:setProperty name="id" property="属性名"/>
或<jsp:setProperty name="id" property="属性名" value="值"/>
<jsp:getProperty name="id" property="属性名"/>
<jsp:include page="url" flush="true|false"/>
<jsp:forward page="url"/>
<jsp:param name="age" value="18"/> //param动作常与include 和 forward 动作搭配使用
如：
<jsp:forward page="url">
<jsp:param name="age" value="18"/>
</jsp:forward>
<jsp:include page="url" flush="true|false">
<jsp:param name="age" value="18"/>
</jsp:include>
3. 内置对象（部分）：
1)request
常用方法:
String request.getParameter(String name);
String[] request.getParameterValues(String name);
Enumeration request.getParameterNames(); //其中Enumeration具有hasMoreElements(); 和 nextElement();方法
Map request.getParameterMap(); //其中
void request.serAttribute("name","value");
Object request.getAttribute("name");
void request.removeAttribute("name");
Cookie[] request.getCookie();
2)response
常用方法：
void response.addCookie(Cookie cookie);
PrintWriter response.getWriter();
void response.sendRedirect("url");
void response.setHeader("refresh","3"); //3秒后刷新
void responser.setHeader("refresh","3;url=login.jsp"); //3秒后刷新，并跳转到login.jsp
3)session
常用方法:
void session.setAttribute("name","value");
Object session.getAttribute("name");
String session.getId();
void session.invalidate(); //session失效
void session.setMaxInactiveInterval(int interval);
void session.setMaxInactiveInterval(60); //有效时间60s
4)application
常用方法：
Object application.getAttribute("name");
void application.setAttribute("name","value");
void application.removeAttribute("name");
二、Servlet
1. 框架：
package cn.edu.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.HttpServlet;
public class FirstServlet extends HttpServlet{
private static final long seriaVersionUID = 1L;
public FirstServlet(){
super();
}
protected void doGet(HttpServeltRequest request,HttpServletResponse response)throws ServletException,IOException{
response.setContextType("text/html;charset=utf-8");
// new String(name.getBytes("iso-8859-1"),"UTF-8");
PrintWriter out = response.getWriter();
String username = request.getParameter("username");
String password = request.getParameter("password");
out.print();
······
}
protected void doPost(HttpServeltRequest request,HttpServletResponse response)throws ServletException,IOException{
doGet(request,response);
}
}
2. 重定向 & 请求转发：
response.sendRedirect("url");
RequestDispatcher rd= request.getRequestDispatcher("url");
rd.forward(request,response);
3. Cookie & Session
1)Cookie 的创建和使用
Cookie cookie = new Cookie("name","value");
response.addCookie(cookie);
Cookie[] cookies = request.getCookie();
void cookie.setMaxAge(60); //cookie有效时间60s
String cookie.getName();
String cookie.getValue();
2)Session 的创建和使用
HttpSession session = request.getSession();
session.setAttribute("name","value");
session.getAttribute("name");
session.removeAttribute("name");
session.setMaxInactiveInterval(60); //session有效时间60s