JSP 之動態包含

最後更新：2018-12-03 來源：互聯網

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JSP之動態包含<jsp:include />

現在我們來看看JSP 的動態包含指令: <jsp:include />

我們建立一個工程TestInclude

然後加入檔案:

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>

查看結果/原始碼:

查看Tomcat 工作目錄:

查看index_jsp.java檔案:

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檔案中

我們看到的<jsp:include page="curDate.jsp?user=ken"/>實際被編譯成以下語句:

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

這個是動態地將參數 (request, response, "curDate.jsp?user=ken",out, false);傳遞到curDate_jsp. java裡執行,注意這些參數在實際程式中是動態,所以當執行這個語句時,curDate_jsp.class 返回結果給index_jsp.class,而這個結果是存放在參數中的對象out中的..簡單地說就是

curDate.jsp取得參數並計算出結果後,再將結果返回給index.jsp(在運行時動態調用的)

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