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duguyiren3476:
我现在的版本是drill0.8.0版本的,搭建了分布式4个节点 ...
walter的drill笔试之二-安装与部署 -
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zh55com 写道如何查询mysql数据?如何查询hbase ...
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zh55com:
如何查询mysql数据?如何查询hbase数据?
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QuarterLifeForJava:
不错,挺好的,那如果是update、delete、insert ...
Mysql百万级数据查询优化
<%@include%>和<jsp:include>的区别
<jsp:include> :动态包含
第一种情况(<jsp:include>包含的是html文件):
DynamicInclude.jsp:
[html]
<%@pagecontentType="text/html;charset=gb2312"%>
<html>
<head>
<title>动态包含</title>
</head>
<bodystylebodystyle="background-color:lightblue">
<jsp:include page="header.html"flush="true"/><!--动态包含-->
<tablebordertableborder="1" align="center">
<tr>
<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>
</tr>
<tr>
<td>a</td><td>b</td><td>c</td><td>d</td>
</tr>
</table>
</body>
</html>
<%@pagecontentType="text/html;charset=gb2312"%> <html> <head> <title>动态包含</title> </head> <bodystyle="background-color:lightblue"> <jsp:include page="header.html"flush="true"/><!--动态包含--> <tableborder="1" align="center"> <tr> <td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td> </tr> <tr> <td>a</td><td>b</td><td>c</td><td>d</td> </tr> </table> </body> </html>
Header.html :
[html]
<h2styleh2style="font-family:arial;color:red;font-size:25px;text-align:center">
动态包含的标题(HTML)
</h2>
<h2style="font-family:arial;color:red;font-size:25px;text-align:center"> 动态包含的标题(HTML) </h2>
运行之后,只生成一个servlet,和上面的代码对应如下:
[java]
out.write("\r\n");
out.write("<html>\r\n");
out.write("\t<head>\r\n");
out.write("\t\t<title>动态包含</title>\r\n");
out.write("\t</head>\r\n");
out.write("\t<bodystyle=\"background-color:lightblue\">\r\n");
out.write("\r\n");
out.write("\t\t");
<span style="color:#ff0000;">org.apache.jasper.runtime.JspRuntimeLibrary.include(request,response, "header.html", out, true);</span>
out.write("<!--动态包含-->\r\n");
out.write("\r\n");
out.write("\t\t<table border=\"1\"align=\"center\">\r\n");
out.write("\t\t\t<tr>\r\n");
out.write("\t\t\t\t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>\r\n");
out.write("\t\t\t</tr>\r\n");
out.write("\t\t\t<tr>\r\n");
out.write("\t\t\t\t<td>a</td><td>b</td><td>c</td><td>d</td>\r\n");
out.write("\t\t\t</tr>\r\n");
out.write("\t\t</table>\r\n");
out.write("\t</body>\r\n");
out.write("</html>");
out.write("\r\n"); out.write("<html>\r\n"); out.write("\t<head>\r\n"); out.write("\t\t<title>动态包含</title>\r\n"); out.write("\t</head>\r\n"); out.write("\t<bodystyle=\"background-color:lightblue\">\r\n"); out.write("\r\n"); out.write("\t\t"); <span style="color:#ff0000;">org.apache.jasper.runtime.JspRuntimeLibrary.include(request,response, "header.html", out, true);</span> out.write("<!--动态包含-->\r\n"); out.write("\r\n"); out.write("\t\t<table border=\"1\"align=\"center\">\r\n"); out.write("\t\t\t<tr>\r\n"); out.write("\t\t\t\t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>\r\n"); out.write("\t\t\t</tr>\r\n"); out.write("\t\t\t<tr>\r\n"); out.write("\t\t\t\t<td>a</td><td>b</td><td>c</td><td>d</td>\r\n"); out.write("\t\t\t</tr>\r\n"); out.write("\t\t</table>\r\n"); out.write("\t</body>\r\n"); out.write("</html>");
第二种情况(<jsp:include>包含的是jsp文件):
DynamicInclude.jsp:
[html]
<%@pagecontentType="text/html;charset=gb2312"%>
<html>
<head>
<title>动态包含</title>
</head>
<bodystylebodystyle="background-color:lightblue">
<jsp:include page="header.jsp"flush="true"/><!--动态包含-->
<tablebordertableborder="1" align="center">
<tr>
<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>
</tr>
<tr>
<td>a</td><td>b</td><td>c</td><td>d</td>
</tr>
</table>
</body>
</html>
<%@pagecontentType="text/html;charset=gb2312"%> <html> <head> <title>动态包含</title> </head> <bodystyle="background-color:lightblue"> <jsp:include page="header.jsp"flush="true"/><!--动态包含--> <tableborder="1" align="center"> <tr> <td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td> </tr> <tr> <td>a</td><td>b</td><td>c</td><td>d</td> </tr> </table> </body> </html>
Header.jsp :
[html]
<%@pagecontentType="text/html;charset=gb2312"%>
<html>
<body>
<h2styleh2style="font-family:arial;color:red;font-size:25px;text-align:center">
动态包含的标题(JSP)
</h2>
</body>
</html>
<%@pagecontentType="text/html;charset=gb2312"%> <html> <body> <h2style="font-family:arial;color:red;font-size:25px;text-align:center"> 动态包含的标题(JSP) </h2> </body> </html>
运行之后,生成了两个servlet:DynamicInclude_jsp.java和header_jsp.java,这也是为什么 Header.jsp中要写上<%@page contentType="text/html;charset=gb2312"%>和完整的<html></html>和<body></body>,而Header.html不用写的原因。因为前者两个.jsp文件是两个相互独立的整体,它们之间的关系是通过request和reponse来发生的,而后者只是简单的嵌套。两个servlet对应的代码如下:
DynamicInclude_jsp.java:
[html]
out.write("\r\n");
out.write("<html>\r\n");
out.write("\t<head>\r\n");
out.write("\t\t<title>动态包含</title>\r\n");
out.write("\t</head>\r\n");
out.write("\t<bodystylebodystyle=\"background-color:lightblue\">\r\n");
out.write("\r\n");
out.write("\t\t");
<span style="color:#ff0000;">org.apache.jasper.runtime.JspRuntimeLibrary.include(request,response, "header.jsp", out, true);</span>
out.write("<!--动态包含-->\r\n");
out.write("\r\n");
out.write("\t\t<table border=\"1\"align=\"center\">\r\n");
out.write("\t\t\t<tr>\r\n");
out.write("\t\t\t\t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>\r\n");
out.write("\t\t\t</tr>\r\n");
out.write("\t\t\t<tr>\r\n");
out.write("\t\t\t\t<td>a</td><td>b</td><td>c</td><td>d</td>\r\n");
out.write("\t\t\t</tr>\r\n");
out.write("\t\t</table>\r\n");
out.write("\t</body>\r\n");
out.write("</html>");
out.write("\r\n"); out.write("<html>\r\n"); out.write("\t<head>\r\n"); out.write("\t\t<title>动态包含</title>\r\n"); out.write("\t</head>\r\n"); out.write("\t<bodystyle=\"background-color:lightblue\">\r\n"); out.write("\r\n"); out.write("\t\t"); <span style="color:#ff0000;">org.apache.jasper.runtime.JspRuntimeLibrary.include(request,response, "header.jsp", out, true);</span> out.write("<!--动态包含-->\r\n"); out.write("\r\n"); out.write("\t\t<table border=\"1\"align=\"center\">\r\n"); out.write("\t\t\t<tr>\r\n"); out.write("\t\t\t\t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>\r\n"); out.write("\t\t\t</tr>\r\n"); out.write("\t\t\t<tr>\r\n"); out.write("\t\t\t\t<td>a</td><td>b</td><td>c</td><td>d</td>\r\n"); out.write("\t\t\t</tr>\r\n"); out.write("\t\t</table>\r\n"); out.write("\t</body>\r\n"); out.write("</html>");
header_jsp.java:
[html]
out.write("\r\n");
out.write("<html>\r\n");
out.write("\t<body>\r\n");
out.write("\t\t<h2 style=\"font-family:arial;color:red;font-size:25px;text-align:center\">\r\n");
out.write("\t\t\t动态包含的标题(JSP)\r\n");
out.write("\t\t</h2>\r\n");
out.write("\t</body>\r\n");
out.write("</html>");
out.write("\r\n"); out.write("<html>\r\n"); out.write("\t<body>\r\n"); out.write("\t\t<h2 style=\"font-family:arial;color:red;font-size:25px;text-align:center\">\r\n"); out.write("\t\t\t动态包含的标题(JSP)\r\n"); out.write("\t\t</h2>\r\n"); out.write("\t</body>\r\n"); out.write("</html>");
<%@include%>:静态包含
第一种情况:<%@include%>包含的是jsp文件。
StaticInclude.jsp:
[html]
<%@pagecontentType="text/html;charset=gb2312"%>
<html>
<head>
<title>静态包含</title>
</head>
<bodystylebodystyle="background-color:lightblue">
<%@include file="header.jsp"%><!--静态包含-->
<tablebordertableborder="1" align="center">
<tr>
<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>
</tr>
<tr>
<td>a</td><td>b</td><td>c</td><td>d</td>
</tr>
</table>
</body>
</html>
<%@pagecontentType="text/html;charset=gb2312"%> <html> <head> <title>静态包含</title> </head> <bodystyle="background-color:lightblue"> <%@include file="header.jsp"%><!--静态包含--> <tableborder="1" align="center"> <tr> <td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td> </tr> <tr> <td>a</td><td>b</td><td>c</td><td>d</td> </tr> </table> </body> </html>
header.jsp:
[html]
<%@pagecontentType="text/html;charset=gb2312"%>
<h2styleh2style="font-family:arial;color:red;font-size:25px;text-align:center">
静态包含的标题(JSP)
</h2>
<%@pagecontentType="text/html;charset=gb2312"%> <h2style="font-family:arial;color:red;font-size:25px;text-align:center"> 静态包含的标题(JSP) </h2>
运行之后,只生成一个servlet,和上面的代码对应如下:
[html]
out.write("\r\n");
out.write("<html>\r\n");
out.write("\t<head>\r\n");
out.write("\t\t<title>静态包含</title>\r\n");
out.write("\t</head>\r\n");
out.write("\t<body style=\"background-color:lightblue\">\r\n");
out.write("\r\n");
out.write("\t\t");
out.write("\r\n");
<span style="color:#ff0000;">out.write("<h2styleh2style=\"font-family:arial;color:red;font-size:25px;text-align:center\">\r\n");
out.write("\t静态包含的标题(JSP)\r\n");
out.write("</h2>");</span>
out.write("<!--静态包含-->\r\n");
out.write("\t\t<table border=\"1\"align=\"center\">\r\n");
out.write("\t\t\t<tr>\r\n");
out.write("\t\t\t\t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>\r\n");
out.write("\t\t\t</tr>\r\n");
out.write("\t\t\t<tr>\r\n");
out.write("\t\t\t\t<td>a</td><td>b</td><td>c</td><td>d</td>\r\n");
out.write("\t\t\t</tr>\r\n");
out.write("\t\t</table>\r\n");
out.write("\t</body>\r\n");
out.write("</html>");
out.write("\r\n"); out.write("<html>\r\n"); out.write("\t<head>\r\n"); out.write("\t\t<title>静态包含</title>\r\n"); out.write("\t</head>\r\n"); out.write("\t<body style=\"background-color:lightblue\">\r\n"); out.write("\r\n"); out.write("\t\t"); out.write("\r\n"); <span style="color:#ff0000;">out.write("<h2style=\"font-family:arial;color:red;font-size:25px;text-align:center\">\r\n"); out.write("\t静态包含的标题(JSP)\r\n"); out.write("</h2>");</span> out.write("<!--静态包含-->\r\n"); out.write("\t\t<table border=\"1\"align=\"center\">\r\n"); out.write("\t\t\t<tr>\r\n"); out.write("\t\t\t\t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>\r\n"); out.write("\t\t\t</tr>\r\n"); out.write("\t\t\t<tr>\r\n"); out.write("\t\t\t\t<td>a</td><td>b</td><td>c</td><td>d</td>\r\n"); out.write("\t\t\t</tr>\r\n"); out.write("\t\t</table>\r\n"); out.write("\t</body>\r\n"); out.write("</html>");
第二种情况:<%@include%>包含的是html文件。
StaticInclude.jsp:
[html]
<%@pagecontentType="text/html;charset=gb2312"%>
<html>
<head>
<title>静态包含</title>
</head>
<bodystylebodystyle="background-color:lightblue">
<%@include file="header.html"%><!--静态包含-->
<tablebordertableborder="1" align="center">
<tr>
<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>
</tr>
<tr>
<td>a</td><td>b</td><td>c</td><td>d</td>
</tr>
</table>
</body>
</html>
<%@pagecontentType="text/html;charset=gb2312"%> <html> <head> <title>静态包含</title> </head> <bodystyle="background-color:lightblue"> <%@include file="header.html"%><!--静态包含--> <tableborder="1" align="center"> <tr> <td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td> </tr> <tr> <td>a</td><td>b</td><td>c</td><td>d</td> </tr> </table> </body> </html>
header.html:
[html]
<%@pagecontentType="text/html;charset=gb2312"%>
<h2styleh2style="font-family:arial;color:red;font-size:25px;text-align:center">
静态包含的标题(HTML)
</h2>
<%@pagecontentType="text/html;charset=gb2312"%> <h2style="font-family:arial;color:red;font-size:25px;text-align:center"> 静态包含的标题(HTML) </h2>
运行之后,也是只生成一个servlet,和上面的代码对应如下:
[html]
out.write("\r\n");
out.write("<html>\r\n");
out.write("\t<head>\r\n");
out.write("\t\t<title>静态包含</title>\r\n");
out.write("\t</head>\r\n");
out.write("\t<bodystylebodystyle=\"background-color:lightblue\">\r\n");
out.write("\r\n");
out.write("\t\t");
out.write("\r\n");
<span style="color:#ff0000;">out.write("<h2styleh2style=\"font-family:arial;color:red;font-size:25px;text-align:center\">\r\n");
out.write("\t静态包含的标题(HTML)\r\n");
out.write("</h2>");</span>
out.write("<!--静态包含-->\r\n");
out.write("\t\t<table border=\"1\"align=\"center\">\r\n");
out.write("\t\t\t<tr>\r\n");
out.write("\t\t\t\t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>\r\n");
out.write("\t\t\t</tr>\r\n");
out.write("\t\t\t<tr>\r\n");
out.write("\t\t\t\t<td>a</td><td>b</td><td>c</td><td>d</td>\r\n");
out.write("\t\t\t</tr>\r\n");
out.write("\t\t</table>\r\n");
out.write("\t</body>\r\n");
out.write("</html>");
out.write("\r\n"); out.write("<html>\r\n"); out.write("\t<head>\r\n"); out.write("\t\t<title>静态包含</title>\r\n"); out.write("\t</head>\r\n"); out.write("\t<bodystyle=\"background-color:lightblue\">\r\n"); out.write("\r\n"); out.write("\t\t"); out.write("\r\n"); <span style="color:#ff0000;">out.write("<h2style=\"font-family:arial;color:red;font-size:25px;text-align:center\">\r\n"); out.write("\t静态包含的标题(HTML)\r\n"); out.write("</h2>");</span> out.write("<!--静态包含-->\r\n"); out.write("\t\t<table border=\"1\"align=\"center\">\r\n"); out.write("\t\t\t<tr>\r\n"); out.write("\t\t\t\t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>\r\n"); out.write("\t\t\t</tr>\r\n"); out.write("\t\t\t<tr>\r\n"); out.write("\t\t\t\t<td>a</td><td>b</td><td>c</td><td>d</td>\r\n"); out.write("\t\t\t</tr>\r\n"); out.write("\t\t</table>\r\n"); out.write("\t</body>\r\n"); out.write("</html>");
由上可以总结出:
对于静态包含,<%@include%>,中包含的文件,只是简单的嵌入到主文件中,就是在jsp页面转化成Servlet时才嵌入到主文件中,因为运行的结果是只生成了一个Servlet。
而对于动态包含<jsp:incude>,如果被包含文件是动态的,那么就会生成两个Servlet,也就是被包含文件也要经过jsp引擎编译执行生成一个Servlet,两个Servlet通过request和reponse进行通信。如果被包含的文件是静态的,那么这种情况和<%@include>就很相似,只生成了一个Servlet,但是他们之间没有进行简单的嵌入,而依然是通过request和reponse进行的通信。
<jsp:include> :动态包含
第一种情况(<jsp:include>包含的是html文件):
DynamicInclude.jsp:
[html]
<%@pagecontentType="text/html;charset=gb2312"%>
<html>
<head>
<title>动态包含</title>
</head>
<bodystylebodystyle="background-color:lightblue">
<jsp:include page="header.html"flush="true"/><!--动态包含-->
<tablebordertableborder="1" align="center">
<tr>
<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>
</tr>
<tr>
<td>a</td><td>b</td><td>c</td><td>d</td>
</tr>
</table>
</body>
</html>
<%@pagecontentType="text/html;charset=gb2312"%> <html> <head> <title>动态包含</title> </head> <bodystyle="background-color:lightblue"> <jsp:include page="header.html"flush="true"/><!--动态包含--> <tableborder="1" align="center"> <tr> <td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td> </tr> <tr> <td>a</td><td>b</td><td>c</td><td>d</td> </tr> </table> </body> </html>
Header.html :
[html]
<h2styleh2style="font-family:arial;color:red;font-size:25px;text-align:center">
动态包含的标题(HTML)
</h2>
<h2style="font-family:arial;color:red;font-size:25px;text-align:center"> 动态包含的标题(HTML) </h2>
运行之后,只生成一个servlet,和上面的代码对应如下:
[java]
out.write("\r\n");
out.write("<html>\r\n");
out.write("\t<head>\r\n");
out.write("\t\t<title>动态包含</title>\r\n");
out.write("\t</head>\r\n");
out.write("\t<bodystyle=\"background-color:lightblue\">\r\n");
out.write("\r\n");
out.write("\t\t");
<span style="color:#ff0000;">org.apache.jasper.runtime.JspRuntimeLibrary.include(request,response, "header.html", out, true);</span>
out.write("<!--动态包含-->\r\n");
out.write("\r\n");
out.write("\t\t<table border=\"1\"align=\"center\">\r\n");
out.write("\t\t\t<tr>\r\n");
out.write("\t\t\t\t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>\r\n");
out.write("\t\t\t</tr>\r\n");
out.write("\t\t\t<tr>\r\n");
out.write("\t\t\t\t<td>a</td><td>b</td><td>c</td><td>d</td>\r\n");
out.write("\t\t\t</tr>\r\n");
out.write("\t\t</table>\r\n");
out.write("\t</body>\r\n");
out.write("</html>");
out.write("\r\n"); out.write("<html>\r\n"); out.write("\t<head>\r\n"); out.write("\t\t<title>动态包含</title>\r\n"); out.write("\t</head>\r\n"); out.write("\t<bodystyle=\"background-color:lightblue\">\r\n"); out.write("\r\n"); out.write("\t\t"); <span style="color:#ff0000;">org.apache.jasper.runtime.JspRuntimeLibrary.include(request,response, "header.html", out, true);</span> out.write("<!--动态包含-->\r\n"); out.write("\r\n"); out.write("\t\t<table border=\"1\"align=\"center\">\r\n"); out.write("\t\t\t<tr>\r\n"); out.write("\t\t\t\t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>\r\n"); out.write("\t\t\t</tr>\r\n"); out.write("\t\t\t<tr>\r\n"); out.write("\t\t\t\t<td>a</td><td>b</td><td>c</td><td>d</td>\r\n"); out.write("\t\t\t</tr>\r\n"); out.write("\t\t</table>\r\n"); out.write("\t</body>\r\n"); out.write("</html>");
第二种情况(<jsp:include>包含的是jsp文件):
DynamicInclude.jsp:
[html]
<%@pagecontentType="text/html;charset=gb2312"%>
<html>
<head>
<title>动态包含</title>
</head>
<bodystylebodystyle="background-color:lightblue">
<jsp:include page="header.jsp"flush="true"/><!--动态包含-->
<tablebordertableborder="1" align="center">
<tr>
<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>
</tr>
<tr>
<td>a</td><td>b</td><td>c</td><td>d</td>
</tr>
</table>
</body>
</html>
<%@pagecontentType="text/html;charset=gb2312"%> <html> <head> <title>动态包含</title> </head> <bodystyle="background-color:lightblue"> <jsp:include page="header.jsp"flush="true"/><!--动态包含--> <tableborder="1" align="center"> <tr> <td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td> </tr> <tr> <td>a</td><td>b</td><td>c</td><td>d</td> </tr> </table> </body> </html>
Header.jsp :
[html]
<%@pagecontentType="text/html;charset=gb2312"%>
<html>
<body>
<h2styleh2style="font-family:arial;color:red;font-size:25px;text-align:center">
动态包含的标题(JSP)
</h2>
</body>
</html>
<%@pagecontentType="text/html;charset=gb2312"%> <html> <body> <h2style="font-family:arial;color:red;font-size:25px;text-align:center"> 动态包含的标题(JSP) </h2> </body> </html>
运行之后,生成了两个servlet:DynamicInclude_jsp.java和header_jsp.java,这也是为什么 Header.jsp中要写上<%@page contentType="text/html;charset=gb2312"%>和完整的<html></html>和<body></body>,而Header.html不用写的原因。因为前者两个.jsp文件是两个相互独立的整体,它们之间的关系是通过request和reponse来发生的,而后者只是简单的嵌套。两个servlet对应的代码如下:
DynamicInclude_jsp.java:
[html]
out.write("\r\n");
out.write("<html>\r\n");
out.write("\t<head>\r\n");
out.write("\t\t<title>动态包含</title>\r\n");
out.write("\t</head>\r\n");
out.write("\t<bodystylebodystyle=\"background-color:lightblue\">\r\n");
out.write("\r\n");
out.write("\t\t");
<span style="color:#ff0000;">org.apache.jasper.runtime.JspRuntimeLibrary.include(request,response, "header.jsp", out, true);</span>
out.write("<!--动态包含-->\r\n");
out.write("\r\n");
out.write("\t\t<table border=\"1\"align=\"center\">\r\n");
out.write("\t\t\t<tr>\r\n");
out.write("\t\t\t\t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>\r\n");
out.write("\t\t\t</tr>\r\n");
out.write("\t\t\t<tr>\r\n");
out.write("\t\t\t\t<td>a</td><td>b</td><td>c</td><td>d</td>\r\n");
out.write("\t\t\t</tr>\r\n");
out.write("\t\t</table>\r\n");
out.write("\t</body>\r\n");
out.write("</html>");
out.write("\r\n"); out.write("<html>\r\n"); out.write("\t<head>\r\n"); out.write("\t\t<title>动态包含</title>\r\n"); out.write("\t</head>\r\n"); out.write("\t<bodystyle=\"background-color:lightblue\">\r\n"); out.write("\r\n"); out.write("\t\t"); <span style="color:#ff0000;">org.apache.jasper.runtime.JspRuntimeLibrary.include(request,response, "header.jsp", out, true);</span> out.write("<!--动态包含-->\r\n"); out.write("\r\n"); out.write("\t\t<table border=\"1\"align=\"center\">\r\n"); out.write("\t\t\t<tr>\r\n"); out.write("\t\t\t\t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>\r\n"); out.write("\t\t\t</tr>\r\n"); out.write("\t\t\t<tr>\r\n"); out.write("\t\t\t\t<td>a</td><td>b</td><td>c</td><td>d</td>\r\n"); out.write("\t\t\t</tr>\r\n"); out.write("\t\t</table>\r\n"); out.write("\t</body>\r\n"); out.write("</html>");
header_jsp.java:
[html]
out.write("\r\n");
out.write("<html>\r\n");
out.write("\t<body>\r\n");
out.write("\t\t<h2 style=\"font-family:arial;color:red;font-size:25px;text-align:center\">\r\n");
out.write("\t\t\t动态包含的标题(JSP)\r\n");
out.write("\t\t</h2>\r\n");
out.write("\t</body>\r\n");
out.write("</html>");
out.write("\r\n"); out.write("<html>\r\n"); out.write("\t<body>\r\n"); out.write("\t\t<h2 style=\"font-family:arial;color:red;font-size:25px;text-align:center\">\r\n"); out.write("\t\t\t动态包含的标题(JSP)\r\n"); out.write("\t\t</h2>\r\n"); out.write("\t</body>\r\n"); out.write("</html>");
<%@include%>:静态包含
第一种情况:<%@include%>包含的是jsp文件。
StaticInclude.jsp:
[html]
<%@pagecontentType="text/html;charset=gb2312"%>
<html>
<head>
<title>静态包含</title>
</head>
<bodystylebodystyle="background-color:lightblue">
<%@include file="header.jsp"%><!--静态包含-->
<tablebordertableborder="1" align="center">
<tr>
<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>
</tr>
<tr>
<td>a</td><td>b</td><td>c</td><td>d</td>
</tr>
</table>
</body>
</html>
<%@pagecontentType="text/html;charset=gb2312"%> <html> <head> <title>静态包含</title> </head> <bodystyle="background-color:lightblue"> <%@include file="header.jsp"%><!--静态包含--> <tableborder="1" align="center"> <tr> <td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td> </tr> <tr> <td>a</td><td>b</td><td>c</td><td>d</td> </tr> </table> </body> </html>
header.jsp:
[html]
<%@pagecontentType="text/html;charset=gb2312"%>
<h2styleh2style="font-family:arial;color:red;font-size:25px;text-align:center">
静态包含的标题(JSP)
</h2>
<%@pagecontentType="text/html;charset=gb2312"%> <h2style="font-family:arial;color:red;font-size:25px;text-align:center"> 静态包含的标题(JSP) </h2>
运行之后,只生成一个servlet,和上面的代码对应如下:
[html]
out.write("\r\n");
out.write("<html>\r\n");
out.write("\t<head>\r\n");
out.write("\t\t<title>静态包含</title>\r\n");
out.write("\t</head>\r\n");
out.write("\t<body style=\"background-color:lightblue\">\r\n");
out.write("\r\n");
out.write("\t\t");
out.write("\r\n");
<span style="color:#ff0000;">out.write("<h2styleh2style=\"font-family:arial;color:red;font-size:25px;text-align:center\">\r\n");
out.write("\t静态包含的标题(JSP)\r\n");
out.write("</h2>");</span>
out.write("<!--静态包含-->\r\n");
out.write("\t\t<table border=\"1\"align=\"center\">\r\n");
out.write("\t\t\t<tr>\r\n");
out.write("\t\t\t\t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>\r\n");
out.write("\t\t\t</tr>\r\n");
out.write("\t\t\t<tr>\r\n");
out.write("\t\t\t\t<td>a</td><td>b</td><td>c</td><td>d</td>\r\n");
out.write("\t\t\t</tr>\r\n");
out.write("\t\t</table>\r\n");
out.write("\t</body>\r\n");
out.write("</html>");
out.write("\r\n"); out.write("<html>\r\n"); out.write("\t<head>\r\n"); out.write("\t\t<title>静态包含</title>\r\n"); out.write("\t</head>\r\n"); out.write("\t<body style=\"background-color:lightblue\">\r\n"); out.write("\r\n"); out.write("\t\t"); out.write("\r\n"); <span style="color:#ff0000;">out.write("<h2style=\"font-family:arial;color:red;font-size:25px;text-align:center\">\r\n"); out.write("\t静态包含的标题(JSP)\r\n"); out.write("</h2>");</span> out.write("<!--静态包含-->\r\n"); out.write("\t\t<table border=\"1\"align=\"center\">\r\n"); out.write("\t\t\t<tr>\r\n"); out.write("\t\t\t\t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>\r\n"); out.write("\t\t\t</tr>\r\n"); out.write("\t\t\t<tr>\r\n"); out.write("\t\t\t\t<td>a</td><td>b</td><td>c</td><td>d</td>\r\n"); out.write("\t\t\t</tr>\r\n"); out.write("\t\t</table>\r\n"); out.write("\t</body>\r\n"); out.write("</html>");
第二种情况:<%@include%>包含的是html文件。
StaticInclude.jsp:
[html]
<%@pagecontentType="text/html;charset=gb2312"%>
<html>
<head>
<title>静态包含</title>
</head>
<bodystylebodystyle="background-color:lightblue">
<%@include file="header.html"%><!--静态包含-->
<tablebordertableborder="1" align="center">
<tr>
<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>
</tr>
<tr>
<td>a</td><td>b</td><td>c</td><td>d</td>
</tr>
</table>
</body>
</html>
<%@pagecontentType="text/html;charset=gb2312"%> <html> <head> <title>静态包含</title> </head> <bodystyle="background-color:lightblue"> <%@include file="header.html"%><!--静态包含--> <tableborder="1" align="center"> <tr> <td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td> </tr> <tr> <td>a</td><td>b</td><td>c</td><td>d</td> </tr> </table> </body> </html>
header.html:
[html]
<%@pagecontentType="text/html;charset=gb2312"%>
<h2styleh2style="font-family:arial;color:red;font-size:25px;text-align:center">
静态包含的标题(HTML)
</h2>
<%@pagecontentType="text/html;charset=gb2312"%> <h2style="font-family:arial;color:red;font-size:25px;text-align:center"> 静态包含的标题(HTML) </h2>
运行之后,也是只生成一个servlet,和上面的代码对应如下:
[html]
out.write("\r\n");
out.write("<html>\r\n");
out.write("\t<head>\r\n");
out.write("\t\t<title>静态包含</title>\r\n");
out.write("\t</head>\r\n");
out.write("\t<bodystylebodystyle=\"background-color:lightblue\">\r\n");
out.write("\r\n");
out.write("\t\t");
out.write("\r\n");
<span style="color:#ff0000;">out.write("<h2styleh2style=\"font-family:arial;color:red;font-size:25px;text-align:center\">\r\n");
out.write("\t静态包含的标题(HTML)\r\n");
out.write("</h2>");</span>
out.write("<!--静态包含-->\r\n");
out.write("\t\t<table border=\"1\"align=\"center\">\r\n");
out.write("\t\t\t<tr>\r\n");
out.write("\t\t\t\t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>\r\n");
out.write("\t\t\t</tr>\r\n");
out.write("\t\t\t<tr>\r\n");
out.write("\t\t\t\t<td>a</td><td>b</td><td>c</td><td>d</td>\r\n");
out.write("\t\t\t</tr>\r\n");
out.write("\t\t</table>\r\n");
out.write("\t</body>\r\n");
out.write("</html>");
out.write("\r\n"); out.write("<html>\r\n"); out.write("\t<head>\r\n"); out.write("\t\t<title>静态包含</title>\r\n"); out.write("\t</head>\r\n"); out.write("\t<bodystyle=\"background-color:lightblue\">\r\n"); out.write("\r\n"); out.write("\t\t"); out.write("\r\n"); <span style="color:#ff0000;">out.write("<h2style=\"font-family:arial;color:red;font-size:25px;text-align:center\">\r\n"); out.write("\t静态包含的标题(HTML)\r\n"); out.write("</h2>");</span> out.write("<!--静态包含-->\r\n"); out.write("\t\t<table border=\"1\"align=\"center\">\r\n"); out.write("\t\t\t<tr>\r\n"); out.write("\t\t\t\t<td>姓名</td><td>性别</td><td>年龄</td><td>爱好</td>\r\n"); out.write("\t\t\t</tr>\r\n"); out.write("\t\t\t<tr>\r\n"); out.write("\t\t\t\t<td>a</td><td>b</td><td>c</td><td>d</td>\r\n"); out.write("\t\t\t</tr>\r\n"); out.write("\t\t</table>\r\n"); out.write("\t</body>\r\n"); out.write("</html>");
由上可以总结出:
对于静态包含,<%@include%>,中包含的文件,只是简单的嵌入到主文件中,就是在jsp页面转化成Servlet时才嵌入到主文件中,因为运行的结果是只生成了一个Servlet。
而对于动态包含<jsp:incude>,如果被包含文件是动态的,那么就会生成两个Servlet,也就是被包含文件也要经过jsp引擎编译执行生成一个Servlet,两个Servlet通过request和reponse进行通信。如果被包含的文件是静态的,那么这种情况和<%@include>就很相似,只生成了一个Servlet,但是他们之间没有进行简单的嵌入,而依然是通过request和reponse进行的通信。
发表评论
-
jsp velocity freemarker 比较
2013-09-06 10:57 731jsp是大家最熟悉的技术 优点: 1、功能强大,可以写jav ... -
HTTP协议详解
2013-08-20 11:57 778引言 ... -
RESTFul以及实现
2013-08-20 11:42 779什么是REST? REST (REpresentatio ... -
spring security3.1开发样例
2013-07-13 15:33 962Spring Security3的使用方法有4种: ... -
springMVC和struts2的比较
2013-07-07 18:41 10781:spring3 mvc开发效率高于struts 2: ... -
mybatis与hibernate比较
2013-07-07 14:57 1078最近做了一个Hibernate ... -
mybatis生成工具MyBatis Generator
2013-06-19 10:28 1293eclipse插件安装地址:http://mybatis. ... -
nginx
2013-05-06 17:37 776Nginx ("engine ... -
REST架构
2013-05-06 17:00 729REST架构风格是全新的针对Web应用的开发风格,是当今世 ... -
webservice
2013-03-28 11:20 906现在webservice加xml技术已经逐渐成熟,但要真正 ... -
frame,iframe,frameset之间的关系与区别
2013-01-02 14:03 902原文出处:http://www.cnblogs.com ... -
JPA2.0 条件查询
2012-10-10 21:05 1390Java代码 packag ... -
灵活控制 Hibernate 的日志或 SQL 输出,以便于诊断
2012-08-18 15:03 1246我们在使用 Hibernate 时一般只会关注是否显示生 ... -
jsp编码格式问题
2012-05-23 16:20 10811 所有的 .java|.jsp|.html|.xml 源文件 ... -
图片分离之图片服务器问题
2012-02-17 22:09 1383现在很多中小网站(尤其是 Web 2.0 站点) 都允许用户上 ... -
坑爹的JPA
2011-11-24 17:48 839order是数据库的固有表格,不能新建order表; memb ... -
修改网站的小图标
2011-11-23 22:02 829通过查看你的源代码发现。 您的设置有问题: <link ... -
jpa得到JDBC的connection
2011-11-23 19:21 2093JPA 2.0 entityManager.getTransa ... -
原样输出HTML
2011-11-21 20:21 1108<textarea></textarea&g ... -
JPA查询语句
2011-11-14 15:03 21891.查询所有信息 Query q = em.createQu ...
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