【Java Web】页面包含
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页面包含分为两种：静态包含和动态包含。
【静态包含】
语法格式：
<%@ includefile="/header.jsp" %>
实例：
①index.jsp
<%@ pagelanguage="java" import="java.util.*"pageEncoding="GB18030"%><%@ includefile="/header.jsp" %><%@ includefile="/content.jsp" %><%@ includefile="/footer.jsp" %>②header.jsp
<html><head><metahttp-equiv="Content-Type" content="text/html;charset=GB18030"><title>Inserttitle here</title></head><body><h1>header</</h1><hr>③content.jsp
yangtianchangxiaochumenqu④footer.jsp
<hr>footer</body></html>要看的结果有三个：
第一，编译的Java类结果
第二，运行的页面效果：
第三，编译的Java类代码：
package org.apache.jsp;import javax.servlet.*;import javax.servlet.http.*;import javax.servlet.jsp.*;public final class index_jsp extends org.apache.jasper.runtime.HttpJspBase implements org.apache.jasper.runtime.JspSourceDependent { private static final JspFactory _jspxFactory = JspFactory.getDefaultFactory(); private static java.util.List _jspx_dependants; static { _jspx_dependants = new java.util.ArrayList(3); _jspx_dependants.add("/header.jsp"); _jspx_dependants.add("/content.jsp"); _jspx_dependants.add("/footer.jsp"); } private javax.el.ExpressionFactory _el_expressionfactory; private org.apache.AnnotationProcessor _jsp_annotationprocessor; public Object getDependants() { return _jspx_dependants; } public void _jspInit() { _el_expressionfactory = _jspxFactory.getJspApplicationContext(getServletConfig().getServletContext()).getExpressionFactory(); _jsp_annotationprocessor = (org.apache.AnnotationProcessor) getServletConfig().getServletContext().getAttribute(org.apache.AnnotationProcessor.class.getName()); } public void _jspDestroy() { } public void _jspService(HttpServletRequest request, HttpServletResponse response) throws java.io.IOException, ServletException { PageContext pageContext = null; HttpSession session = null; ServletContext application = null; ServletConfig config = null; JspWriter out = null; Object page = this; JspWriter _jspx_out = null; PageContext _jspx_page_context = null; try { response.setContentType("text/html; charset=GB18030"); 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'); out.write('\n'); out.write("<html>\r\n"); out.write("<head>\r\n"); out.write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=GB18030\">\r\n"); out.write("<title>Insert title here</title>\r\n"); out.write("</head>\r\n"); out.write("<body>\r\n"); out.write("\t<h1>header</</h1>\r\n"); out.write("\t<hr>"); out.write('\r'); out.write('\n'); out.write("yangtianchangxiaochumenqu\r\n"); out.write("\r\n"); out.write("\r\n"); out.write("<hr>\r\n"); out.write("footer\r\n"); out.write("</body>\r\n"); out.write("</html>"); out.write(" \r\n"); out.write("\r\n"); out.write('\r'); out.write('\n'); } catch (Throwable t) { if (!(t instanceof 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); } } finally { _jspxFactory.releasePageContext(_jspx_page_context); } }}【动态包含】
语法格式：
（1）不带参数：<jsp:include page="/footer.jsp"/>
（2）带参数：
<jsp:includepage="/footer.jsp"/>
<jsp:paramvalue="这是参数" name="参数名" />
</jsp:include>
实例：
只改动了上例中的index.jsp页面，如下：
<%@ pagelanguage="java" contentType="text/html; charset=GB18030"pageEncoding="GB18030"%><%@ includefile="/header.jsp" %><%@ includefile="/content.jsp" %> <%-- <%@ includefile="/footer.jsp" %> --%> <jsp:includepage="/footer.jsp"></jsp:include>同样看两个结果，
第一，编译的Java类：
第二，运行的页面效果：
第三，Java类代码：
index_jsp.java:
package org.apache.jsp;import javax.servlet.*;import javax.servlet.http.*;import javax.servlet.jsp.*;public final class index_jsp extends org.apache.jasper.runtime.HttpJspBase implements org.apache.jasper.runtime.JspSourceDependent { private static final JspFactory _jspxFactory = JspFactory.getDefaultFactory(); private static java.util.List _jspx_dependants; static { _jspx_dependants = new java.util.ArrayList(2); _jspx_dependants.add("/header.jsp"); _jspx_dependants.add("/content.jsp"); } private javax.el.ExpressionFactory _el_expressionfactory; private org.apache.AnnotationProcessor _jsp_annotationprocessor; public Object getDependants() { return _jspx_dependants; } public void _jspInit() { _el_expressionfactory = _jspxFactory.getJspApplicationContext(getServletConfig().getServletContext()).getExpressionFactory(); _jsp_annotationprocessor = (org.apache.AnnotationProcessor) getServletConfig().getServletContext().getAttribute(org.apache.AnnotationProcessor.class.getName()); } public void _jspDestroy() { } public void _jspService(HttpServletRequest request, HttpServletResponse response) throws java.io.IOException, ServletException { PageContext pageContext = null; HttpSession session = null; ServletContext application = null; ServletConfig config = null; JspWriter out = null; Object page = this; JspWriter _jspx_out = null; PageContext _jspx_page_context = null; try { response.setContentType("text/html; charset=GB18030"); 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'); out.write('\n'); out.write("<html>\r\n"); out.write("<head>\r\n"); out.write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=GB18030\">\r\n"); out.write("<title>Insert title here</title>\r\n"); out.write("</head>\r\n"); out.write("<body>\r\n"); out.write("\t<h1>header</</h1>\r\n"); out.write("\t<hr>"); out.write('\r'); out.write('\n'); out.write("yangtianchangxiaochumenqu\r\n"); out.write("\r\n"); out.write("\r\n"); out.write("\r\n"); out.write("\r\n"); org.apache.jasper.runtime.JspRuntimeLibrary.include(request, response, "/footer.jsp", out, false); out.write('\r'); out.write('\n'); } catch (Throwable t) { if (!(t instanceof 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); } } finally { _jspxFactory.releasePageContext(_jspx_page_context); } }}footer_jsp.java:package org.apache.jsp;import javax.servlet.*;import javax.servlet.http.*;import javax.servlet.jsp.*;public final class footer_jsp extends org.apache.jasper.runtime.HttpJspBase implements org.apache.jasper.runtime.JspSourceDependent { private static final JspFactory _jspxFactory = JspFactory.getDefaultFactory(); private static java.util.List _jspx_dependants; private javax.el.ExpressionFactory _el_expressionfactory; private org.apache.AnnotationProcessor _jsp_annotationprocessor; public Object getDependants() { return _jspx_dependants; } public void _jspInit() { _el_expressionfactory = _jspxFactory.getJspApplicationContext(getServletConfig().getServletContext()).getExpressionFactory(); _jsp_annotationprocessor = (org.apache.AnnotationProcessor) getServletConfig().getServletContext().getAttribute(org.apache.AnnotationProcessor.class.getName()); } public void _jspDestroy() { } public void _jspService(HttpServletRequest request, HttpServletResponse response) throws java.io.IOException, ServletException { PageContext pageContext = null; HttpSession session = null; ServletContext application = null; ServletConfig config = null; JspWriter out = null; Object page = this; JspWriter _jspx_out = null; PageContext _jspx_page_context = null; 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("<hr>\r\n"); out.write("footer\r\n"); out.write("</body>\r\n"); out.write("</html>"); } catch (Throwable t) { if (!(t instanceof 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); } } finally { _jspxFactory.releasePageContext(_jspx_page_context); } }}【区别】
<%@ includefile=""%>指令在编写代码的时候一般放在最顶部，主要附加的是被重用的代码，这里所说的附加是指把源代码原封不动的附加过来，所以附加的页面代码要如同上例中，最后的结果是把几个页面的代码原封不动的放在一起，是一个正确的页面描述。
<jsp:include>标签导入一个重用文件的时候，这个文件是经过编译的，通俗点说就是附加这个要导入文件经过编译后的效果，所以可以含有与当前jsp程序中重复的内容，因为在附加过来之前就会被解析掉。
综上，静态包含是先将几个页面内容原封不动放在一个页面中，然后再进行编译。动态包含是先将各个页面进行编译，然后将编译之后的Java类根据包含顺序合并在一起。
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