吴裕雄--天生自然轻量级JAVA EE企业应用开发Struts2Sping4Hibernate整合开发学习笔记：JSP2特性

<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> 表达式语言 - 算术运算符 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
    <h2>表达式语言 - 算术运算符</h2><hr/>
    <table border="1" bgcolor="#aaaadd">
        <tr>
            <td><b>表达式语言</b></td>
            <td><b>计算结果</b></td>
        </tr>
        <!-- 直接输出常量 -->
        <tr>
            <td>${1}</td>
            <td>${1}</td>
        </tr>
        <!-- 计算加法 -->
        <tr>
            <td>${1.2 + 2.3}</td>
            <td>${1.2 + 2.3}</td>
        </tr>
        <!-- 计算加法 -->
        <tr>
            <td>${1.2E4 + 1.4}</td>
            <td>${1.2E4 + 1.4}</td>
        </tr>
        <!-- 计算减法 -->
        <tr>
            <td>${-4 - 2}</td>
            <td>${-4 - 2}</td>
        </tr>
        <!-- 计算乘法 -->
        <tr>
            <td>${21 * 2}</td>
            <td>${21 * 2}</td>
        </tr>
        <!-- 计算除法 -->
        <tr>
            <td>${3/4}</td>
            <td>${3/4}</td>
        </tr>
        <!-- 计算除法 -->
        <tr>
            <td>${3 div 4}</td>
            <td>${3 div 4}</td>
        </tr>
        <!-- 计算除法 -->
        <tr>
            <td>${3/0}</td>
            <td>${3/0}</td>
        </tr>
        <!-- 计算求余 -->
        <tr>
            <td>${10%4}</td>
            <td>${10%4}</td>
        </tr>
        <!-- 计算求余 -->
        <tr>
            <td>${10 mod 4}</td>
            <td>${10 mod 4}</td>
        </tr>
        <!-- 计算三目运算符 -->
        <tr>
            <td>${(1==2) ? 3 : 4}</td>
            <td>${(1==2) ? 3 : 4}</td>
        </tr>
    </table>
</body>
</html>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> 表达式语言 - 内置对象 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
    <h2>表达式语言 - 内置对象</h2>
    请输入你的名字：
    <!-- 通过表单提交请求参数 -->
    <form action="implicit-objects.jsp" method="post">
        <!-- 通过${param['name']} 获取请求参数 -->
        你的名字 = <input type="text" name="name" value="${param['name']}"/>
        <input type="submit" value='提交'/>
    </form><br/>
    <% session.setAttribute("user" , "abc");
    // 下面三行代码添加Cookie
    Cookie c = new Cookie("name" , "yeeku");
    c.setMaxAge(24 * 3600);
    response.addCookie(c);
    %>
    <table border="1" width="660" bgcolor="#aaaadd">
        <tr>
            <td width="170"><b>功能</b></td>
            <td width="200"><b>表达式语言</b></td>
            <td width="300"><b>计算结果</b></td>
        <tr>
            <!-- 使用两种方式获取请求参数值 -->
            <td>取得请求参数值</td>
            <td>${param.name}</td>
            <td>${param.name}&nbsp;</td>
        </tr>
        <tr>
            <td>取得请求参数值</td>
            <td>${param["name"]}</td>
            <td>${param["name"]}&nbsp;</td>
        </tr>
        <tr>
            <!-- 使用两种方式获取指定请求头信息 -->
            <td>取得请求头的值</td>
            <td>${header.host}</td>
            <td>${header.host}</td>
        </tr>
        <tr>
            <td>取得请求头的值</td>
            <td>${header["accept"]}</td>
            <td>${header["accept"]}</td>
        </tr>
        <!-- 获取Web应用的初始化参数值 -->
        <tr>
            <td>取得初始化参数值</td>
            <td>${initParam["author"]}</td>
            <td>${initParam["author"]}</td>
        </tr>
        <!-- 获取session返回的属性值 -->
        <tr>
            <td>取得session的属性值</td>
            <td>${sessionScope["user"]}</td>
            <td>${sessionScope["user"]}</td>
        </tr>
        <!-- 获取指定Cookie的值 -->
        <tr>
            <td>取得指定Cookie的值</td>
            <td>${cookie["name"].value}</td>
            <td>${cookie["name"].value}</td>
        </tr>
    </table>
</body>
</html>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> 表达式语言 - 逻辑运算符 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
    <h2>表达式语言 - 逻辑运算符</h2><hr/>
    数字之间的比较：
    <table border="1" bgcolor="#aaaadd">
        <tr>
            <td><b>表达式语言</b></td>
            <td><b>计算结果</b></td>
        </tr>
        <!-- 直接比较两个数字 -->
        <tr>
            <td>${1 &lt; 2}</td>
            <td>${1 < 2}</td>
        </tr>
        <!-- 使用lt比较运算符 -->
        <tr>
            <td>${1 lt 2}</td>
            <td>${1 lt 2}</td>
        </tr>
        <!-- 使用>比较运算符 -->
        <tr>
            <td>${1 &gt; (4/2)}</td>
            <td>${1 > (4/2)}</td>
        </tr>
        <!-- 使用gt比较运算符 -->
        <tr>
            <td>${1 gt (4/2)}</td>
            <td>${1 gt (4/2)}</td>
        </tr>
        <!-- 使用>=比较运算符 -->
        <tr>
            <td>${4.0 &gt= 3}</td>
            <td>${4.0 >= 3}</td>
        </tr>
        <!-- 使用ge比较运算符 -->
        <tr>
            <td>${4.0 ge 3}</td>
            <td>${4.0 ge 3}</td>
        </tr>
        <!-- 使用<=比较运算符 -->
        <tr>
            <td>${4 &lt;= 3}</td>
            <td>${4 <= 3}</td>
        </tr>
        <!-- 使用le比较运算符 -->
        <tr>
            <td>${4 le 3}</td>
            <td>${4 le 3}</td>
        </tr>
        <!-- 使用==比较运算符 -->
        <tr>
            <td>${100.0 == 100}</td>
            <td>${100.0 == 100}</td>
        </tr>
        <!-- 使用eq比较运算符 -->
        <tr>
            <td>${100.0 eq 100}</td>
            <td>${100.0 eq 100}</td>
        </tr>
        <!-- 使用!=比较运算符 -->
        <tr>
            <td>${(10*10) != 100}</td>
            <td>${(10*10) != 100}</td>
        </tr>
        <!--  先执行运算，再进行比较运算，使用ne比较运算符-->
        <tr>
            <td>${(10*10) ne 100}</td>
            <td>${(10*10) ne 100}</td>
        </tr>
    </table>
    字符之间的比较：
    <table border="1" bgcolor="#aaaadd">
        <tr>
            <td><b>表达式语言</b></td>
            <td><b>计算结果</b></td>
        </tr>
        <tr>
            <td>${'a' &lt; 'b'}</td>
            <td>${'a' < 'b'}</td>
        </tr>
        <tr>
            <td>${'hip' &gt; 'hit'}</td>
            <td>${'hip' > 'hit'}</td>
        </tr>
        <tr>
            <td>${'4' &gt; 3}</td>
            <td>${'4' > 3}</td>
        </tr>
    </table>
</body>
</html>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> 页面配置2 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
    <h2>页面配置2</h2>
    下面是表达式语言输出：<br/>
    ${1 + 2}<br/>
    下面是小脚本输出：<br/>
    <%out.println("hello Java");%>
</body>
</html>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<%@ taglib prefix="crazyit" uri="http://www.crazyit.org/tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> new document </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
    <h2>表达式语言 - 自定义函数</h2><hr/>
    请输入一个字符串：
    <form action="useFunctions.jsp" method="post">
        字符串 = <input type="text" name="name" value="${param['name']}">
        <input type="submit"  value="提交">
    </form>
    <table border="1" bgcolor="aaaadd">
        <tr>
        <td><b>表达式语言</b></td>
        <td><b>计算结果</b></td>
        <tr>
        <tr>
            <td>${param["name"]}</td>
            <td>${param["name"]}&nbsp;</td>
        </tr>
        <!--  使用reverse函数-->
        <tr>
            <td>${crazyit:reverse(param["name"])}</td>
            <td>${crazyit:reverse(param["name"])}&nbsp;</td>
        </tr>
        <tr>
            <td>${crazyit:reverse(crazyit:reverse(param["name"]))}</td>
            <td>${crazyit:reverse(crazyit:reverse(param["name"]))}&nbsp;</td>
        </tr>
        <!-- 使用countChar函数 -->
        <tr>
            <td>${crazyit:countChar(param["name"])}</td>
            <td>${crazyit:countChar(param["name"])}&nbsp;</td>
        </tr>
    </table>
</body>
</html>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<%@ page import="java.util.*" %>
<%@ taglib prefix="tags" tagdir="/WEB-INF/tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>迭代器tag file</title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
    <h2>迭代器tag file</h2>
    <%
    // 创建集合对象，用于测试Tag File所定义的标签
    List<String> a = new ArrayList<String>();
    a.add("疯狂Java讲义");
    a.add("轻量级Java EE企业应用实战");
    a.add("疯狂Ajax讲义");
    // 将集合对象放入页面范围
    request.setAttribute("a" , a);
    %>
    <h3>使用自定义标签</h3>
    <tags:iterator bgColor="#99dd99" cellColor="#9999cc"
        title="迭代器标签" bean="a" />
</body>
</html>
<div style="background-color:#dddddd;font-size:10pt">
<font color="blue">Copyright &copyright; 2001-2016.
<a href="http://www.crazyit.org">疯狂Java联盟</a></font>
</div>
<div style="background-color:#dddddd;font-size:12pt">
<font color="red">隐式导入的页面头</font>
</div>
<%--
网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
author  yeeku.H.lee kongyeeku@163.com
version  1.0
Copyright (C), 2001-2016, yeeku.H.Lee
This program is protected by copyright laws.
Program Name:
Date: 
--%>

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> 页面配置1 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<h2>页面配置1</h2>
下面是表达式语言输出：<br/>
${1 + 2}
</body>
</html>
<?xml version="1.0" encoding="GBK"?>
<!-- 定义生成文件的project根元素，默认的target为空 -->
<project name="web" basedir="." default="">
    <!-- 定义三个简单属性 -->
    <property name="src" value="src"/>
    <property name="classes" value="classes"/>
    <!-- 定义一组文件和目录集 -->
    <path id="classpath">
        <fileset dir="lib">
            <include name="**/*.jar"/>
        </fileset>
        <pathelement path="${classes}"/>
    </path>
    <!-- 定义compile target，用于编译Java源文件 -->
    <target name="compile" description="编译Java源文件">
        <!-- 先删除classes属性所代表的文件夹 -->
        <delete dir="${classes}"/>
        <!-- 创建classes属性所代表的文件夹 -->
        <mkdir dir="${classes}"/>
        <copy todir="${classes}">
            <fileset dir="${src}">
                <exclude name="**/*.java"/>
            </fileset>
        </copy>
        <!-- 编译Java文件，编译后的class文件放到classes属性所代表的文件夹内 -->
        <javac destdir="${classes}" debug="true" includeantruntime="yes"
            deprecation="false" optimize="false" failonerror="true">
            <!-- 指定需要编译的Java文件所在的位置 -->
            <src path="${src}"/>
            <!-- 指定编译Java文件所需要第三方类库所在的位置 -->
            <classpath refid="classpath"/>
        </javac>
    </target>
</project>
<?xml version="1.0" encoding="GBK"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
    http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
    version="3.1">
    <!-- 关于JSP的配置信息 -->
    <jsp-config>
        <jsp-property-group>
            <!-- 对哪些文件应用配置 -->
            <url-pattern>/noscript/*</url-pattern>
            <!-- 忽略表达式语言 -->
            <el-ignored>true</el-ignored>
            <!-- 页面编码的字符集 -->
            <page-encoding>GBK</page-encoding>
            <!-- 不允许使用Java脚本 -->
            <scripting-invalid>true</scripting-invalid>
            <!-- 隐式导入页面头  -->
            <include-prelude>/inc/top.jspf</include-prelude>
            <!-- 隐式导入页面尾 -->
            <include-coda>/inc/bottom.jspf</include-coda>
        </jsp-property-group>
        <jsp-property-group>
            <!-- 对哪些文件应用配置 -->
            <url-pattern>*.jsp</url-pattern>
            <el-ignored>false</el-ignored>
            <!-- 页面编码字符集 -->
            <page-encoding>GBK</page-encoding>
            <!-- 允许使用Java脚本 -->
            <scripting-invalid>false</scripting-invalid>
        </jsp-property-group>
        <jsp-property-group>
            <!-- 对哪些文件应用配置 -->
            <url-pattern>/inc/*</url-pattern>
            <el-ignored>false</el-ignored>
            <!-- 页面编码字符集 -->
            <page-encoding>GBK</page-encoding>
            <!-- 不允许使用Java脚本 -->
            <scripting-invalid>true</scripting-invalid>
        </jsp-property-group>
    </jsp-config>

    <context-param>
        <param-name>author</param-name>
        <param-value>yeeku</param-value>
    </context-param>

</web-app>
<?xml version="1.0" encoding="GBK"?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
    web-jsptaglibrary_2_0.xsd" version="2.0">
    <tlib-version>1.0</tlib-version>
    <short-name>crazyit</short-name>
    <!-- 定义该标签库的URI -->
    <uri>http://www.crazyit.org/tags</uri>
    <!-- 定义第一个函数 -->
    <function>
        <!-- 定义函数名:reverse -->
        <name>reverse</name>
        <!-- 定义函数的处理类 -->
        <function-class>lee.Functions</function-class>
        <!-- 定义函数的实现方法-->
        <function-signature>
            java.lang.String reverse(java.lang.String)</function-signature>
    </function>
    <!-- 定义第二个函数: countChar -->
    <function>
        <!-- 定义函数名:countChar -->
        <name>countChar</name>
        <!-- 定义函数的处理类 -->
        <function-class>lee.Functions</function-class>
        <!-- 定义函数的实现方法-->
        <function-signature>int countChar(java.lang.String)
            </function-signature>
    </function>
</taglib>
package lee;
/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */
public class Functions
{
    // 对字符串进行反转
    public static String reverse( String text )
    {
        return new StringBuffer( text ).reverse().toString();
    }
    // 统计字符串的个数
    public static int countChar( String text )
    {
        return text.length();
    }
}
<%@ tag pageEncoding="GBK" import="java.util.List"%>
<!-- 定义了四个标签属性 -->
<%@ attribute name="bgColor" %>
<%@ attribute name="cellColor" %>
<%@ attribute name="title" %>
<%@ attribute name="bean" %>
<table border="1" bgcolor="${bgColor}">
<tr>
    <td><b>${title}</b></td>
</tr>
<%List<String> list = (List<String>)
    request.getAttribute("a");
// 遍历输出list集合的元素
for (Object ele : list){%>
    <tr>
        <td bgcolor="${cellColor}">
        <%=ele%>
        </td>
    </tr>
<%}%>
</table>
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原文地址：https://www.cnblogs.com/tszr/p/12364046.html