JSP syntax (9)--

js| Grammar <jsp:getProperty>


Gets the value of the Bean's property for display in the page





JSP syntax



<jsp:getproperty name= "Beaninstancename" property= "PropertyName"/>


Example




<jsp:usebean id= "Calendar" scope= "page" "class=" employee. Calendar "/>


Calendar of <jsp:getproperty name= "Calendar" property= "username"/>







Describe


This <jsp:getProperty> element will get the Bean's property value and can be used or displayed in the JSP page. Before you use <jsp:getProperty>, you must use <jsp:useBean> Create it.


<jsp:getProperty> elements have some limitations:




You can't use <jsp:getProperty> to retrieve a property that has already been indexed.


You can use &LT;JSP:GETPROPERTY&GT with JavaBeans components, but not with enterprise

Bean used together.





Property





Name= "Beaninstancename"
Name of the bean, specified by <jsp:useBean>





Property= "PropertyName"
The name of the property of the specified bean.





Skills:




As mentioned in Sun's JSP reference, if you use <jsp:getProperty> to retrieve a value that is null, then NullPointerException will appear, and if you use a program segment or an expression to retrieve its value, Then there is null (empty) on the browser.