《Servlet和jsp学习指南》笔记1

chapter 1 Servlet

4个java 包：

对于每一个http请求，Servlet请求都会创建一个ServletRequest实例，并将它传给Servlet的service方法。ServletRequest封装有关请求的信息。

Chapter 2 Session管理

cookie

Cookie cookie=new Cookie(name,value);

response.addCookie(cookie);

获取cookie：

删除cookie（创建一个同名cookie，将它的maxAge属性设置为0，添加到响应中）：

HttpSession

chapter 3 JSP

简单的jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="ISO-8859-1"%>
<%@ page import="java.util.Date" %>
<%@ page import="java.text.DateFormat" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>jsp页面</title>
</head>
<body>
        <%
            DateFormat dateFormat=DateFormat.getDateInstance(DateFormat.LONG);
            String s=dateFormat.format(new Date());
            out.println("Today is " + s);
        
        %>
</body>
</html>

隐式对象

不需要创建，直接拿来使用，例如上例中的out;

脚本元素

Scriptlet 。写在 <% %>中的代码块。该代码块会编译在servlet的service（_jspService方法）方法中，作为局部变量；
表达式。<%=java.util.Calendar.getInstance().getTime()%>，其效果等同于<% out.print(java.util.Calendar.getInstance().getTime()); %>，注意：表达式的后面不能有分号。
声明。写在<%! %>中声明的变量和方法。该代码块会编译在servlet类中，作为全局变量或方法。(声明可以放在jsp中的任何位置，可以有多个声明)

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="ISO-8859-1"%>
<%@ page import="java.util.Date" %>
<%@ page import="java.text.DateFormat" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>jsp页面</title> 
</head>
<body>
    <%!
    public Date getTodaysDate(){
        return new java.util.Date();
    }
    public void jspInit(){        //覆盖servlet的init方法
        System.out.println("jspInit......");
    }
    public void jspDestroy(){    //覆盖servlet的destroy方法
        System.out.println("jspDestroy......");
    }
    %>
        <%
            DateFormat dateFormat=DateFormat.getDateInstance(DateFormat.LONG);
            String s=dateFormat.format(new Date());
            out.println("Today is " + s);
        
        %>
        <br>
        Now time is <%=getTodaysDate() %> 
</body>
</html>

编译的servlet类：

/*
 * Generated by the Jasper component of Apache Tomcat
 * Version: Apache Tomcat/7.0.47
 * Generated at: 2018-11-20 01:42:51 UTC
 * Note: The last modified time of this file was set to
 *       the last modified time of the source file after
 *       generation to assist with modification tracking.
 */
package org.apache.jsp.page.test;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import java.util.Date;
import java.text.DateFormat;

public final class a_jsp extends org.apache.jasper.runtime.HttpJspBase
    implements org.apache.jasper.runtime.JspSourceDependent {


    public Date getTodaysDate(){
        return new java.util.Date();
    }
    public void jspInit(){        //è¦çservletçinitæ¹æ³
        System.out.println("jspInit......");
    }
    public void jspDestroy(){    //è¦çservletçdestroyæ¹æ³
        System.out.println("jspDestroy......");
    }
    
  private static final javax.servlet.jsp.JspFactory _jspxFactory =
          javax.servlet.jsp.JspFactory.getDefaultFactory();

  private static java.util.Map<java.lang.String,java.lang.Long> _jspx_dependants;

  private javax.el.ExpressionFactory _el_expressionfactory;
  private org.apache.tomcat.InstanceManager _jsp_instancemanager;

  public java.util.Map<java.lang.String,java.lang.Long> getDependants() {
    return _jspx_dependants;
  }

  public void _jspInit() {
    _el_expressionfactory = _jspxFactory.getJspApplicationContext(getServletConfig().getServletContext()).getExpressionFactory();
    _jsp_instancemanager = org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(getServletConfig());
  }

  public void _jspDestroy() {
  }

  public void _jspService(final javax.servlet.http.HttpServletRequest request, final javax.servlet.http.HttpServletResponse response)
        throws java.io.IOException, javax.servlet.ServletException {

    final javax.servlet.jsp.PageContext pageContext;
    javax.servlet.http.HttpSession session = null;
    final javax.servlet.ServletContext application;
    final javax.servlet.ServletConfig config;
    javax.servlet.jsp.JspWriter out = null;
    final java.lang.Object page = this;
    javax.servlet.jsp.JspWriter _jspx_out = null;
    javax.servlet.jsp.PageContext _jspx_page_context = null;


    try {
      response.setContentType("text/html; charset=UTF-8");
      pageContext = _jspxFactory.getPageContext(this, request, response,
                  null, true, 8192, true);
      _jspx_page_context = pageContext;
      application = pageContext.getServletContext();
      config = pageContext.getServletConfig();
      session = pageContext.getSession();
      out = pageContext.getOut();
      _jspx_out = out;

      out.write("\r\n");
      out.write("\r\n");
      out.write("\r\n");
      out.write("<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3.org/TR/html4/loose.dtd\">\r\n");
      out.write("<html>\r\n");
      out.write("<head>\r\n");
      out.write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=ISO-8859-1\">\r\n");
      out.write("<title>jspé¡µé¢</title> \r\n");
      out.write("</head>\r\n");
      out.write("<body>\r\n");
      out.write("\t");
      out.write("\r\n");
      out.write("\t\t");

            DateFormat dateFormat=DateFormat.getDateInstance(DateFormat.LONG);
            String s=dateFormat.format(new Date());
            out.println("Today is " + s);
        
        
      out.write("\r\n");
      out.write("\t\t<br>\r\n");
      out.write("\t\tNow time is ");
      out.print(getTodaysDate() );
      out.write(" \r\n");
      out.write("</body>\r\n");
      out.write("</html>");
    } catch (java.lang.Throwable t) {
      if (!(t instanceof javax.servlet.jsp.SkipPageException)){
        out = _jspx_out;
        if (out != null && out.getBufferSize() != 0)
          try { out.clearBuffer(); } catch (java.io.IOException e) {}
        if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);
        else throw new ServletException(t);
      }
    } finally {
      _jspxFactory.releasePageContext(_jspx_page_context);
    }
  }
}

<%@ page import="com.test.vo.UserVO" %>

动作

chapter 4 EL

EL表达式格式：${expression}

保留字：

chapter 8 监听器

创建监听器类实现Listener接口。

注册监听器：

注解方式：监听器类上添加@WebListener
部署描述符：在web.xml中添加<listener><listener-class>fully-qualified listener class</listener-class></listener>

监听器接口种类：

chapter 9 过滤器

chapter 10 程序设计

mvc设计模式：

posted @ 2018-11-19 17:31 笔记Next 阅读(168) 评论(0) 编辑收藏举报

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《Servlet和jsp学习指南》 笔记1