【JSTL】--c:out演示--drp213

 

1.引用jar包

【JSTL】--c:out演示--drp213_第1张图片

 

 

2.导入jstl taglib

【JSTL】--c:out演示--drp213_第2张图片

 

 

JSTL标签c:out,结合EL表达式的使用。输出。

 

【JSTL】--c:out演示--drp213_第3张图片

jstl_core.jsp:

<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
   <%@ taglib uri="http://java.sun.com/jsp/jstl/core"  prefix="c"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>Insert title here</title>
</head>
<body>
	<h1>测试JSTL核心库</h1>
	<hr>
	<li>采用c:out标签</li><br>
	 hello(使用标签:)<c:out value="123"/><br>
	 hello(使用标签:)<c:out value="hello"/><br>
	 hello(使用标签:)<c:out value="${hello}"/><br>
	 hello(使用标签:EL表达式)${hello}<br>
	 hello(default):${hello123 }<br>
	 hello(使用缺省值):<c:out value="${hello123 }" default="没有值"/><br>
	 hello(使用缺省值):<c:out value="${hello123 }" >没有值</c:out><br>
	 Welcome(使用EL表达式):${welcome}<br>
	 welcome(使用标签,escapeXml=true):<c:out value="${welcome }" escapeXml="true"/><br>
	 welcome(使用标签,escapeXml=false):<c:out value="${welcome }" escapeXml="false"/><br>
	 
	 
	
</body>
</html>

 JstlCoreServlet:

/**
 * 
 */
package com.bjpowrnode.jstl;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @ClassName:JstlCoreServlet
 * @Description:TODO
 * @author wm
 * @date 2016年2月15日上午11:40:32
 */
public class JstlCoreServlet extends HttpServlet {

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		//普通字符串
		request.setAttribute("hello","Hello World!");
		request.setAttribute("welcome", "<font color='red'>欢迎你来到这个世界!</font>");
		request.getRequestDispatcher("/jstl_core.jsp").forward(request, response);
	}


}

 index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
  </head>
  
  <body>
   	<a href="servlet/JstlElServlet">EL表达式</a><br> 	
   	<a href="servlet/JstlCoreServlet">jstl表达式</a><br>
  </body>
</html>

 web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
 
	 <servlet>
	 	<servlet-name>JstlElServlet</servlet-name>
	 	<servlet-class>com.bjpowrnode.jstl.JstlElServlet</servlet-class>
	 </servlet>
	<servlet-mapping>
		<servlet-name>JstlElServlet</servlet-name>
		<url-pattern>/servlet/JstlElServlet</url-pattern>
	</servlet-mapping>
	
	
	 <servlet>
	 	<servlet-name>JstlCoreServlet</servlet-name>
	 	<servlet-class>com.bjpowrnode.jstl.JstlCoreServlet</servlet-class>
	 </servlet>
	<servlet-mapping>
		<servlet-name>JstlCoreServlet</servlet-name>
		<url-pattern>/servlet/JstlCoreServlet</url-pattern>
	</servlet-mapping>
</web-app>

 

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