org.apache.struts2.components
类 Push

java.lang.Object
  org.apache.struts2.components.Component
      org.apache.struts2.components.Push

public class Push
extends Component

Push value on stack for simplified usage.

• value* (Object) - value to be pushed into the top of the stack

Examples

 
 <s:push value="user">
     <s:propery value="firstName" />
     <s:propery value="lastName" />
 </s:push>
 
 

Pushed user into the stack, and hence property tag could access user's properties (firstName, lastName etc) since user is now at the top of the stack

 
  <s:push value="myObject">                              ----- (1)
       <s:bean name="jp.SomeBean" var="myBean"/>        ----- (2)
          <s:param name="myParam" value="top"/>        ----- (3)
       </s:bean>
   </s:push>
 
 

 
 when in (1), myObject is at the top of the stack
 when in (2), jp.SomeBean is in the top of stack, also in stack's context with key myBean
 when in (3), top will get the jp.SomeBean instance
 
 

 
 <s:push value="myObject">                                       ---(A)
    <s:bean name="jp.SomeBean" var="myBean"/>                   ---(B)
       <s:param name="myParam" value="top.mySomeOtherValue"/>  ---(C)
    </s:bean>
 </s:push>
 
 

 
 when in (A), myObject is at the top of the stack
 when in (B), jp.SomeBean is at the top of the stack, also in context with key myBean
 when in (C), top refers to jp.SomeBean instance. so top.mySomeOtherValue would invoke SomeBean's mySomeOtherValue() method
 
 

 
 <s:push value="myObject">                                 ---- (i)
    <s:bean name="jp.SomeBean" var="myBean"/>             ---- (ii)
       <s:param name="myParam" value="[1].top"/>         -----(iii)
    </s:bean>
 </s:push>
 
 

 
 when in (i), myObject is at the top of the stack
 when in (ii), jp.SomeBean is at the top of the stack, followed by myObject
 when in (iii), [1].top will returned top of the cut of stack starting from myObject, namely myObject itself
 
 

字段摘要

从类 org.apache.struts2.components.Component 继承的字段

COMPONENT_STACK

构造方法摘要

Push(com.opensymphony.xwork2.util.ValueStack stack)

方法摘要

boolean	end(Writer writer, String body) Callback for the end tag of this component.
void	setValue(String value)
boolean	start(Writer writer) Callback for the start tag of this component.

从类 org.apache.struts2.components.Component 继承的方法

addAllParameters, addParameter, altSyntax, copyParams, getComponentStack, getParameters, getStack, setActionMapper, setThrowExceptionsOnELFailure, setUrlHelper, usesBody

从类 java.lang.Object 继承的方法

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造方法详细信息

Push

public Push(com.opensymphony.xwork2.util.ValueStack stack)

方法详细信息

start

public boolean start(Writer writer)

从类 Component 复制的描述

Callback for the start tag of this component. Should the body be evaluated?

覆盖：

类 Component 中的 start

参数：

writer - the output writer.

返回：

true if the body should be evaluated

end

public boolean end(Writer writer,
                   String body)

从类 Component 复制的描述

Callback for the end tag of this component. Should the body be evaluated again?

NOTE: will pop component stack.

覆盖：

类 Component 中的 end

参数：

writer - the output writer.

body - the rendered body.

返回：

true if the body should be evaluated again

setValue

public void setValue(String value)