JSP技术
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一.jsp脚本和注释
- jsp脚本:
1) <%java 代码%>----------内部的java代码翻译到service 方法的内部
2) <%=java变量或表达式%>-------会被翻译成service方法内部的out.print()
3) <%java 代码%>会被翻译成servlet的成员的内容
- jsp注释:
1) html注释: <!--注释内容-->
2) java注释: //单行注释 /*多行注释*/
3) jsp注释: <%--注释内容--%>
1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 2 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> 3 <modelVersion>4.0.0</modelVersion> 4 <groupId>com.werner</groupId> 5 <artifactId>jsp2</artifactId> 6 <packaging>war</packaging> 7 <version>1.0-SNAPSHOT</version> 8 <name>jsp2 Maven Webapp</name> 9 <url>http://maven.apache.org</url> 10 <dependencies> 11 <dependency> 12 <groupId>junit</groupId> 13 <artifactId>junit</artifactId> 14 <version>3.8.1</version> 15 <scope>test</scope> 16 </dependency> 17 <dependency> 18 <groupId>javax.servlet.jsp</groupId> 19 <artifactId>javax.servlet.jsp-api</artifactId> 20 <version>2.3.1</version> 21 <scope>provided</scope> 22 </dependency> 23 <dependency> 24 <groupId>javax.servlet</groupId> 25 <artifactId>javax.servlet-api</artifactId> 26 <version>3.1.0</version> 27 <scope>provided</scope> 28 </dependency> 29 <!-- https://mvnrepository.com/artifact/javax.el/javax.el-api --> 30 <dependency> 31 <groupId>javax.el</groupId> 32 <artifactId>javax.el-api</artifactId> 33 <version>3.0.0</version> 34 </dependency> 35 <!-- https://mvnrepository.com/artifact/javax.servlet.jsp.jstl/jstl --> 36 <dependency> 37 <groupId>javax.servlet.jsp.jstl</groupId> 38 <artifactId>jstl</artifactId> 39 <version>1.2</version> 40 </dependency> 41 <!-- https://mvnrepository.com/artifact/taglibs/standard --> 42 <dependency> 43 <groupId>taglibs</groupId> 44 <artifactId>standard</artifactId> 45 <version>1.1.2</version> 46 </dependency> 47 </dependencies> 48 <build> 49 <finalName>jsp2</finalName> 50 </build> 51 </project>
<%@page language="java" contentType="text/html;UTF-8" pageEncoding="UTF-8" %>
<%@page import="java.util.*" %>
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
xxxxxxxxx
<!--html的注释-->
<%----%> jsp注释
<% int i=0;
System.out.println(i);
%>
<%=i %>
<%=1+1 %>
<%!
String str ="nihao CHIAN";
%>
<%=str%>
</body>
</html>
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xxxxxxxxx jsp注释 0 2 nihao CHIAN
- jsp运行原理
JSP在第一次被访问时会被WEB容器翻译成servlet,在执行过程:
第一次访问----->hellosServlet.java---->helloServlet_jsp.servlet----->编译运行PS
:被翻译后的servlet在Tomcat 的work目录中可以找到
- jap指令(3个)
jsp的指令是指导jsp翻译和运行的命令,jsp包括三大指令:
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