JavaServer Pages Pocket Reference

<jsp:setProperty>

The <jsp:setProperty> action sets the value of one or more bean properties. It supports the attributes described in Table 1-9.

Table 1-9. Attributes for <jsp:setProperty>

Name	Java type	Request-time value accepted	Description
name	String	no	Mandatory. The name assigned to a bean in one of the JSP scopes.
property	String	no	Mandatory. The name of the bean property to set, or an asterisk (*) to set all properties with names matching the request parameters.
param	String	no	Optional. The name of a request parameter that holds the value to use for the specified property. If omitted, the parameter name and property name must be the same.
value	See below	yes	Optional. An explicit value to assign to the property. This attribute cannot be combined with the param attribute.

The property type can be any valid Java type, including primitive types and arrays (i.e., an indexed property). If the value attribute specifies a runtime attribute value, the type of the expression must match the property’s type.

If the value is a string, either in the form of a request parameter value or explicitly specified by the value attribute, it is converted to the property’s type as described in Table 1-10.

Table 1-10. Conversion of string value to property type

Property type	Conversion method
boolean or Boolean	Boolean.valueOf(String)
byte or Byte	Byte.valueOf(String)
char or Character	String.charAt(int)
double or Double	Double.valueOf(String) ...