JSP语法简介

JSP指令

<%@ 指令名 属性=”值”>

page指令

<%@ page contentType="text/html; charset=GB2312" %>  

include指令

<%@ include file="banner.jsp" %>  

JSP声明

声明JSP对应Servlet类的成员变量

<%!
private int var = 0;
private String str;
%>

Java程序

<%
    //Get the identifier of the book to display
    String bookId = request.getParameter("bookId");
    if(bookId==null)bookId="201";
    BookDetails book = bookDB.getBookDetails(bookId);
%>
<% 
   if(book==null)
   { 
%>
    <p>书号"<%=bookId%>"在数据库中不存在<p>
    <strong><a href="<%=request.getContextPath()%>/catalog.jsp">继续购物</a></strong>
<% 
     return;
   }
%>  

Java表达式

<p>书名：<%=convert(book.getTitle())%></p> 

隐含对象

• request(javax.servlet.http.HttpServletRequest)
• pageContext (javax.servlet.jsp.PageContext)
• session (javax.servlet.http.HttpSession)
• application (javax.servlet.ServletContext)
• config (javax.servlet.ServletConfig)
• out (javax.servlet.jsp.JspWriter)
• page(java.lang.Object page)
• pageContext (javax.servlet.jsp.PageContext)
• exception(java.lang.Exception)