EL表达式的使用.docx
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EL表达式的使用
第八章View层开发：
EL和JSTL
JSP/Servlet/Java2011-03-1423:
35:
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本章任务
升级E-Book电子书店系统
。
使用EL和JSTL简化页面开发
。
订单的处理
本章目标
。
理解并会使用EL
。
理解并会使用常用的JSTL标签
为什么需要EL和JSTL
。
JSP标准动作的局限
1、一般是操作javaBean的局限
2、javaBean的属性只能为基本数据类型
3、不能进行逻辑操作
publicclassSchool{
privateTeacherteacher;
privateStudentstudent;
……//属性的getter、setter方法
}（JavaBean属性不是基本类型，如何进行读取和赋值）
。
如何解决这个问题
1、EL和JSTL
什么是EL
。
什么是EL
1、EL即ExpressionLanguage（表达式语言）
。
EL的功能
1、与getProperty/>类似
2、简化Property/>
。
EL的语法
1、${EL.exprission}
2、${bean.name }或${ bean['name']}
（${bean.name}实质是调用bean的getName（）方法）
EL的使用
。
EL在output.jsp中的使用
<%@pagecontentType="text/html;charset=GBK">
EL的使用</p><p>//param是EL的隐式对象，param.name等价于request.getParameter（"name"）</p><p><jsp:</p><p>userBeanid="bean"class="com.accp.ch08.Simplebean"scope="request"></p><p><jsp:</p><p>setPropertyname="bean"property="name"value="${param.name}"/></p><p><jsp:</p><p>setPropertyname="bean"property="age"value="25"/></p><p></head></p><p><body></p><p>姓名：</p><p>${bean.name} <br>//EL表达式 //EL表达式更简洁、易懂</p><p>年龄：</p><p>${bean.age}</p><p></body></p><p></html></p><p> </p><p>什么是JSTL</p><p>。</p><p>为了实现页面无脚本，还要借助于JSTL</p><p>。</p><p>什么是JSTL</p><p>1、JSTL（javaServerPagesStandardTadLibrary）JSP标准标签库</p><p>。</p><p>JSTL的优点</p><p>1、提供一组标准标签</p><p>2、可用户编写各种动态JSP页面</p><p>3、用户访问数据库</p><p> </p><p>JSTL标准标签库介绍</p><p>。</p><p>JSTL标准标签库内的标签</p><p>。</p><p>JSTL标准标签库包括：</p><p>（核心标签库）</p><p>。</p><p>通用标签---set----remove----out</p><p>。</p><p>条件标签---if</p><p>。</p><p>迭代标签---forEach</p><p>（SQL标签库）</p><p>。</p><p>update</p><p>。</p><p>param</p><p>。</p><p>query</p><p> </p><p>JSTL的使用</p><p>。</p><p>使用JSTL的步骤</p><p>1、创建Web工程，选择JSTL1.1</p><p>2、在JSP页面添加taglib指令</p><p>3、使用JSTL标签</p><p>……</p><p><%@tagliburl=http:</p><p>//java.sun.jsp.jstl.coreprefix="c"%></p><p>……</p><p> </p><p>通用标签</p><p>。</p><p>通用标签的使用</p><p>1、set</p><p>2、out</p><p>3、remove</p><p>…… //插入使用核心标签的指令</p><p><%@tabliburl=“prefix=”c"%></p><p><body></p><p>//set标签用户给变量设置值和作用范围 //scope="page|request|session|appliaction“</p><p><c:</p><p>setvar=”example"value="${100+1}"scope="session"/></p><p><c:</p><p>outvalue="${example}"/> //out标签在页面上显示信息或变量值</p><p><c:</p><p>removevar="example"scope="session"/> //remove标签用于删除作用域内的变量</p><p></body></p><p>……</p><p> </p><p>通用标签示例</p><p>。</p><p>通用标签的使用</p><p>……</p><p><jsp:</p><p>userBeanid="titlesBean"class="com.accp.ch08.titleBean"/></p><p><c:</p><p>setvar="titles"value="${titlesBean.titles}"scope="session" /></p><p>……</p><p> </p><p>……</p><p><%</p><p>TitlesBeantitlesBean=newTitlesBean（）;</p><p>LIsttitels=TitlesBean.getTitles（）;</p><p>session.setAttribute（"titles",titles）;</p><p>%></p><p> </p><p>条件标签示例</p><p>。</p><p>使用JSTL实现登录验证--register2.jsp</p><p><%@tagliburl="prefix="c“></p><p><jsp:</p><p>userBeanid=”userManager"class="com.accp.ch08.UserManager"scope="request"></p><p>//给对象的属性赋值</p><p><jsp:</p><p>setPropertyname="userManager"property="name"param="loginName"/></p><p><jsp:</p><p>setPropertyname="userManager"property="password" param="password"/></p><p>//调用getValid（）方法，进行用户验证</p><p><c:</p><p>iftest="${userManager.valid}"></p><p> <jsp:</p><p>forwardpage="books.jsp"/></p><p></c:</p><p>if></p><p>//如果返回true，转到books2.jsp否则返回到注册页面</p><p><c:</p><p>iftest="${userManager.valid}"></p><p> <jsp:</p><p>forwardpage="register.jsp" /></p><p></c:</p><p>if></p><p> </p><p>条件标签</p><p>。</p><p>条件标签的使用</p><p>if标签</p><p>……</p><p><%@tagliburl=" prefix=”c" %></p><p><body> </p><p>//test="${条件运算}"//test指定条件//运算符包含：</p><p>，<,==,and等</p><p>//var="varName"//var指定test条件的变量的名称</p><p>//scope="page"//scope指定范围 //page|request|session|appliaction</p><p><c:</p><p>iftest="${条件运算}"var="varName"scope="page"/></p><p> //条件为true时，执行代码</p><p><c:</p><p>if></p><p>……</p><p> </p><p>迭代标签示例</p><p>。</p><p>迭代标签实现for循环功能</p><p><%@tagliburl="prefix="c"%></p><p><%@taglibimport="com.accp.ch08.TitlesBean"%></p><p><jsp:</p><p>userBeanid="titlesBean"class="com.accp.ch08.TielesBean" /></p><p><body></p><p> <c:</p><p>setvar="tites"value="${titlesBean.titles}"scope="session" /></p><p> <c:</p><p>forEachvar="currentBook"items="${sessionScope.titles}"></p><p> ……//显示书籍信息</p><p> </c:</p><p>forEach></p><p></body></p><p> </p><p>迭代标签的使用</p><p>。</p><p>forEach</p><p><%@tagliburl="prefix="c"%></p><p><body></p><p>//var指定集合内数据的变量名称//items指定要遍历的集合对象</p><p><c:</p><p>forEachvar="varName"items="collection"></p><p> //循环内容</p><p></c:</p><p>forEach></p><p></body></p><p>……</p><p> </p><p>迭代标签与for的关系</p><p>。</p><p>迭代标签与for循环的对应关系---books2.jsp</p><p>……</p><p><jsp:</p><p>userBeanid="titlesBean"class="com.accp.ch08.TitlesBean"></p><p><c:</p><p>setvar="titles"value="${titlesBean.titles}"scope="session"/></p><p> //sessionScope是EL表示作用域范围的隐式对象</p><p><c:</p><p>forEachvar="currentBook"items="${sessionScope.titles}"/></p><p><ahref="displayBook.jsp?</p><p>isbn=${currentBook.ISBN}">${currentBook.title},${currentBook.editionNumber}</a></p><p></c:</p><p>forEach></p><p>……</p><p> </p><p><%for（inti=0;i<titles.size（）;i++）{</p><p> currentBook=（BookBean）titles.get（i）;%></p><p><ahref="displayBook.jsp？</p><p>Iisbn=${currentBook.ISBN}"></p><p> ${currentBook.title},${currentBook.editionNumber}</p><p></a></p><p><% } %></p><p> </p><p>EL隐式对象</p><p>。</p><p>EL隐式对象小结</p><p>隐式对象包括</p><p>1、作用域访问对象</p><p>pageScope</p><p>requestScope</p><p>sessionScope</p><p>appliactionScope</p><p>2、参数访问对象</p><p>param</p><p>paramValues</p><p>3、JSP隐式对象</p><p>pageContext</p><p> </p><p>EL隐式对象介绍</p><p>对象名称 说明</p><p>pageScope 返回页面范围的变量名，这些名称已映射至相应的值</p><p>requestScope 返回请求范围的变量名，这些名称已映射至相应的值</p><p>sessionScope 返回会话范围的变量名，这些名称已映射至相应的值</p><p>appliactionScope 返回应用范围内的变量，并将变量名映射至相应的值</p><p>param 返回客户端的请求参数的字符串值</p><p>paramValue 返回映射至客户端的请求参数的一组值</p><p>pageContext 提供对用户的请求和页面信息访问</p><p> </p><p>SQL标签</p><p>。</p><p>SQL标签可以直接在JSP页面操作数据库中数据</p><p>。</p><p>SQL标签的组成</p><p>1、setDataSource标签</p><p>2、update标签</p><p>3、query标签</p><p>4、param标签</p><p> </p><p>SQL标签的update示例</p><p>。</p><p>使用update标签修改数据库中数据</p><p><%@taglib url="prefix="c"%></p><p><%@tagliburl="prefix="sql"%></p><p>……//设置数据源</p><p>//使用SQL标签在数据表中添加数据</p><p><sql:</p><p>updatevar="order" dataSource="${conn}"></p><p> insertintoBoodOrder（username,zipcode,phone,creditcard,total）values（'accp','1000020','8888866666','12345678901',50.00）</p><p></sql:</p><p>update></p><p> </p><p>update标签的使用</p><p>。</p><p>setDataSource标签</p><p>。</p><p>。</p><p>定义数据源</p><p>……</p><p><sql:</p><p>setDataSourcedriver="driverClass"url="databaseURL"user="username"password="userpass"var="datasource"/></p><p></sql:</p><p>setDataSource></p><p>……</p><p> </p><p>update标签</p><p>。</p><p>对数据库的insert、update、delete操作</p><p>……</p><p><sql:</p><p>updatedataSource="datasource"var="varName"scope="page"></p><p> updatetestsetname='accp'</p><p></sql:</p><p>update></p><p>……</p><p> </p><p>param标签的使用</p><p>。</p><p>param标签</p><p>。</p><p>。</p><p>设置参数值</p><p>……</p><p><sql:</p><p>updatedataSource="datasource"var="varName"scope="page"></p><p> updatetestsetname=?</p><p>whereid=?</p><p> <sql:</p><p>paramvalue="accp"/> //param标签设置参数</p><p> <sql:</p><p>paramvalue="1"/> //param标签在update或query标签内使用</p><p></sql:</p><p>update></p><p>……</p><p> </p><p>update标签与param标签</p><p>。</p><p>带参数的update标签</p><p><%@tagliburl="prefix="c"%></p><p><%@tagliburl="prefix="sql"%></p><p>//设置数据源</p><p><sql:</p><p>setDataSourcedriver="com.microsoft.jdbc.sqlserver.SQLServerDriver"url="jdbc:</p><p>microsoft:</p><p>sqlserver:</p><p>//localhost:</p><p>1917;DatabaseName=books"</p><p>user="sa"password="120010"var="conn"/></p><p>//update标签设置SQL语句</p><p><sql:</p><p>updatevar="order"dataSource="${conn}"></p><p> insertintoBookOrder（username,zipcode,phone,creditcard,total）values（?</p><p>?</p><p>?</p><p>?</p><p>?</p><p>）;</p><p>//param标签设置参数</p><p> <sql:</p><p>paramvalue='${param["username"]}'/></p><p> <sql:</p><p>paramvalue='${param["zipcode"]}'/></p><p> <sql:</p><p>paramvalue='${param["phone"]}'/></p><p> <sql:</p><p>paramvalue='${param["creditcard"]}'/></p><p> <sql:</p><p>paramvalue='${100}'/></p><p></sql:</p><p>update></p><p> </p><p>SQL标签的query示例</p><p>。</p><p>使用query标签查询数据库中数据</p><p>//导入JSTL标签</p><p><%@tagliburl="prefix="c"%></p><p><%@tagliburl="prefix="sql"></p><p>……//设置数据源</p><p>//query标签得到结果集</p><p><sql:</p><p>queryvar=“rs”dataSource="${conn}"></p><p>selectorderid,username,zipcode,totalformBookOrderorderbyorderid</p><p></sql:</p><p>query></p><p> </p><p> </p><p>query标签的使用</p><p>。</p><p>query标签</p><p>。</p><p>。</p><p>对数据库的select操作</p><p>……</p><p>//var="varName"//指定结果集名称</p><p>//dataSource="datasource"指定数据源</p><p>//scope="page"//指定范围</p><p><sql:</p><p>queryvar="varName"dataSource="datasource"scope="page"></p><p> select*fromtest; //sql语句</p><p></sql:</p><p>query></p><p>……</p><p> </p><p>query标签示例</p><p>。</p><p>使用query标签查询数据，并在页面上显示</p><p>//导入JSTL标签</p><p><%@tagliburl="prefix="c"></p><p><%@tagliburl="prefix="sql"></p><p>//设置数据源</p><p><sql:</p><p>setDataSourcedriver="com.microsoft.jdbc.sqlserver.SQLServerDriver"</p><p>url="jdbc:</p><p>microsoft:</p><p>sqlserver:</p><p>//lcalhost:</p><p>1917;DatabaseName=books"</p><p>user="sa" password="120010"var="conn"/></p><p>//query标签得到结果集</p><p><sql:</p><p>queryvar="rs"dataSource="${conn}"></p><p> selectorderid,username,zipcode,totalformBookOrderorderbyorderid</p><p></sql:</p><p>query></p><p>//使用forEach标签循环输出结果集内容</p><p><forEachvar="row"items="${rs.rows}"></p><p> 订单：</p><p>${row.orderid}用户名：</p><p>${row.username}</p><p> 邮编：</p><p>${row.zipcode}总价：</p><p>${row.total}<br></p><p></forEach></p><p></p>
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EL
表达式
使用
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EL表达式的使用.docx