第6章自定义JSP标签祥解.ppt

示例：sql:transactionsql:update sql:transaction dataSource=${example} sql:update var=newTable create table mytable(nameidintprimary key, name varchar(80)) /sql:update sql:update var=updateCount INSERT INTO mytableVALUES (1,Paul Oakenfold) /sql:update sql:update var=updateCount INSERT INTO mytableVALUES (2,Timo Maas) /sql:update ... sql:query var=deejays SELECT * FROM mytable /sql:query /sql:transaction * JSTL * * * * * * c:set定义举例 c:set var=customerTable scope=application table border=1 c:forEach var=customer items=${customers} tr td${customer.lastName}/td tdc:outvalue=${customer.address} default=no address  specified//td td c:out value=${customer.address} font color=redno address specified/font /c:out /td /tr /c:forEach /table /c:set * The content between c:set and /c:set is saved as ${customerTable}. JSTL 举例：使用预定义变量customerTable h4Using customerTable application scope attribute defined in Set.jsp a first time/h4 c:out value=${customerTable} escapeXml=false/ h4Using customerTable application scope attribute defined in Set.jsp a second time/h4 c:out value=${customerTable} escapeXml=false / * JSTL 举例：使用预定义变量customerTable * JSTL 变量支持—c:remove 删除一个EL变量 c:remove var=cart scope=session/ * JSTL 条件控制标签 流控制标签可以消除对脚本语句的需求 没有条件控制标签，页面开发人员必须在JSP页面中使用脚本语句 c:if test=”..” 根据test属性值有条件地执行主体部分 c:choose 根据嵌套子标签c:when 和 c:otherwise有选择地执行条件语句块 与if-then-else类似 * JSTL 示例：c:iftest=”...” c:forEach var=customer items=${customers} c:if test=${customer.address.country== USA} ${customer}br /c:if /c:forEach 只有属性address.country的值为USA的customers才通过c:forEach循环显示 * JSTL 示例：c:choose, c:when c:forEach var=customer items=${customers} c:choose c:when test=${customer.address.country== USA} font color=blue /c:when c:when test=${customer.address.country== Canada} font color=red /c:when c:otherwise font color=green /c:otherw