Entity bean is defined in jsp < jsp:useBean id=“clu” class=“cn.domain.CacluBean” > < /jsp:useBean > < jsp:getProperty property=“propertyname” name = “clu” > Get the property value of bean and output the value to the page;

EL expression :${entity object name} When the el expression is used to fetch data, it is usually used with the. Sign, and the. Sign.

data pageContext. findAttribute (” ”); / / page request session, application find order

< ! — when looking for bean in page, if not, create an bean — > < ! Content in the body of the tag is used only when bean is created (instantiated) >

jsp is assigned to bean: < ! — manual assignment — > < jsp:setProperty property=“age” name=“personbean” value=“23” / > < ! — request parameter assignment, request data support string conversion to 8 basic data types — > < jsp:setProperty property=“age” name=“personbean” param=“age” / > < jsp:setProperty property=“birthdty” name=“personbean” value=” < %=new Date() % > ” / >

< jsp:setProperty property=”*” name=“clu” > Set the properties of bean and assign bean with all request parameters;

// import Java class:

< %@ page import=“cn.domain.*”% > < ! — static include: include at compile time, compile all jsp included into one servlet, the efficiency performance is better than dynamic include — >