采用基本JSP语句创建复合式网页

      创建动态Web页面的最基本的办法是为每个页面创建独立的JSP文件。图16-2和图16-3分别为tilestaglibs应用的主页index.jsp和产品页面product.jsp。

本节介绍的tilestaglibs应用的源程序位于配套光盘的sourcecode/tilestaglibs/version1/tilestaglibs目录下。如果要在Tomcat上发布这个应用，只要把version1目录下的整个tilestaglibs子目录拷贝到CATALINA_HOME/webapps目录下即可。

图16-2 tilestaglibs应用的主页index.jsp


图16-3 tilestaglibs应用的产品页面product.jsp

例程16-1和例程16-2分别为index.jsp和product.jsp的源代码。例程16-1 index.jsp
    例程16-1 index.jsp

 <%@ page contentType="text/html; charset=UTF-8" %>

  
     
  
  
      <%-- One table lays out all of the content for this page --%>
     
        
            <%-- Sidebar--%>
           
            <%-- Main content--%>
           
        
     

<%-- Sidebar top --%>                                                                               <%-- Sidebar bottom --%>                                                                                                                                                                                                           Links                         Home                         Products                         Hot Link1                         Hot Link2                         Hot Link3

<%-- Header--%>                                                                              <%-- Content--%>                                                                               <%-- Footer--%>                                                                               Welcome to ABC Inc.                                                                      Page-specific content goes here                                                                      Thanks for stopping by!

  

例程16-2 product.jsp

 <%@ page contentType="text/html; charset=UTF-8" %>

  
     
  
  
      <%-- One table lays out all of the content for this page --%>
     
        
            <%-- Sidebar--%>
           
            <%-- Main content--%>
           
        
     

<%-- Sidebar top --%>                                                                               <%-- Sidebar bottom --%>                                                                                                                                                                                                            Links                         Home                         Products                         Hot Link1                         Hot Link2                         Hot Link3

<%-- Header--%>                                                                              <%-- Content--%>                                                                               <%-- Footer--%>                                                                               Welcome to ABC Inc.                                                                      Products              product1                         product2                         product3                                                                      Thanks for stopping by!

  

由例程16-1和例程16-2可以看出，在index.jsp和product.jsp文件中，仅仅粗体字标识的代码块不是重复代码，其余部分均为重复代码。如果网页的相同部分发生需求变更，必须手工修改所有的JSP文件。可见，采用基本的JSP语句来编写上述网页，会导致JSP代码的大量冗余，增加开发与维护成本。

【责编:Ken】

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 <%@ page contentType="text/html; charset=UTF-8" %>

  
     
  
  
      <%-- One table lays out all of the content for this page --%>
     
        
            <%-- Sidebar--%>
           
            <%-- Main content--%>
           
        
     

<%-- Sidebar top --%>                                                                               <%-- Sidebar bottom --%>                                                                                                                                                                                                            Links                         Home                         Products                         Hot Link1                         Hot Link2                         Hot Link3

<%-- Header--%>                                                                              <%-- Content--%>                                                                               <%-- Footer--%>                                                                               Welcome to ABC Inc.                                                                      Products              product1                         product2                         product3                                                                      Thanks for stopping by!

  

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