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JSP 之动态包含 <jsp:include />

2011-11-04 20:25 288 查看

JSP之动态包含<jsp:include />

现在我们来看看JSP 的动态包含指令: <jsp:include />

我们新建一个工程TestInclude

然后加入文件:

Index.jsp:

<%@ page language="java"import="java.util.*" pageEncoding="ISO-8859-1"%>
<html>
<body>
<jsp:include page="curDate.jsp?user=ken"/>
<p>index.jsp'srequest: <%out.println(request);%> </p>
</body>
</html>

curDate.jsp:

<%@ page language="java"import="java.util.*" %>
<p>curDate.jsp: <%=new Date()%></p> <!-- curDate-->
<%= request.getParameter("user") %>
<p>curDate.jsp's request: <%out.println(request);%> </p>

查看结果/源代码:

查看Tomcat 工作目录:

查看index_jsp.java文件:

try {
response.setContentType("text/html;charset=ISO-8859-1");
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("<html>\r\n");
out.write(" <body>\r\n");
out.write("  \t");
org.apache.jasper.runtime.JspRuntimeLibrary.include(request,response, "curDate.jsp?user=ken", out, false);
out.write("\r\n");
out.write(" \t<p>index.jsp's request: ");
out.print(request);
out.write(" </p>\r\n");
out.write(" </body>\r\n");
out.write("</html>\r\n");
} catch (java.lang.Throwable t) {

curDate_jsp.java:

try {
response.setContentType("text/html");
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("<p>curDate.jsp: ");
out.print(new Date());
out.write("</p> <!-- curDate -->\r\n");
out.print( request.getParameter("user") );
out.write("\r\n");
out.write("<p>curDate.jsp's request: ");
out.print(request);
out.write(" </p>");
} catch (java.lang.Throwable t) {

在index_jsp.java文件中
我们看到的<jsp:include page="curDate.jsp?user=ken"/>实际被编译成以下语句:

org.apache.jasper.runtime.JspRuntimeLibrary.include(request,response,"curDate.jsp?user=ken", out, false);

这个是动态地将参数 (request, response, "curDate.jsp?user=ken",out, false);传递到curDate_jsp. java里执行,注意这些参数在实际程序中是动态的,所以当执行这个语句时,curDate_jsp.class 返回结果给index_jsp.class,而这个结果是存放在参数中的对象out中的..简单地说就是

curDate.jsp取得参数并计算出结果后,再将结果返回给index.jsp(在运行时动态调用的)

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JSP 之 动态包含 &lt;jsp:include /&gt;

JSP 之动态包含 <jsp:include />