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java.lang.Object
org.apache.struts.action.Action
org.apache.struts.actions.DispatchAction
org.apache.struts.actions.LookupDispatchAction(Struts1.1)
org.apache.struts.actions.EventDispatchAction(Struts1.2.9)
org.apache.struts.actions.MappingDispatchAction(Struts1.2)
DispatchAction
public abstract class DispatchAction extends Action
这是一个抽象的Action,它会根据request 中的parameter来执行相应的方法。通个这个Action类可以将不同的Action集中到一个Action文件中来。
struts-config.xml:
action path="/subscription" type="org.example.SubscriptionAction" name="subscriptionForm" scope="request" input="/subscription.jsp" parameter="method"/>
在Action中要有相应的方法:
public class SubscriptionAction extends DispatchAction {
public ActionForward delete(ActionMapping mapping, ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception {}
public ActionForward insert(ActionMapping mapping, ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception {}
public ActionForward update(ActionMapping mapping, ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception {}
}
然后可以通过这样的方法来访问你的程序:
http://localhost:8080/myapp/subscription.do?method=delete
http://localhost:8080/myapp/subscription.do?method=insert
http://localhost:8080/myapp/subscription.do?method=update
如果parameter中参数为空,则调用Action中的unspecified方法
LookupDispatchAction
public abstract class LookupDispatchAction extends DispatchAction
通过这个Action抽象类继承DispatchAction,它的相应方法的执行由ActionMapping中parameter属性决定。每个动作实际上就是标签的property属性值。它适合在一个form中有很多按钮,按不同的按钮则执行不同的操作。
struts-config.xml:
action path="/subscription" type="org.example.SubscriptionAction" name="subscriptionForm" scope="request"
input="/subscription.jsp" parameter="method"/>
ApplicationResources.properties:
button.add=Add Record
button.delete=Delete Record
JSP:
@ page pageEncoding="GBK"%>
@ taglib uri="http://struts.apache.org/tags-html" prefix="html"%>
html>
head>
title>多提交演示title>
head>
body>
html:form action="subscription">
html:submit property="method">
bean:message key="button.add"/>
html:submit>
html:submit property="method">
bean:message key="button.delete"/>
html:submit>
html:form>
body>
html>
在Action中必须实现getKeyMethodMap方法:
public class SubscriptionAction extends LookupDispatchAction {
protected Map getKeyMethodMap() {
Map map = new HashMap();
map.put("button.add", "add");
map.put("button.delete", "delete");
return map;
}
public ActionForward add(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception {}
public ActionForward delete(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception {}
}
EventDispatchAction
public class EventDispatchAction extends DispatchAction
通过这个Action抽象类继承DispatchAction,它的相应方法的执行由ActionMapping中parameter属性指定多个动作,中间用逗号(,)分隔。每个动作实际上就是标签的property属性值。它适合在一个form中有很多按钮,按不同的按钮则执行不同的操作。
struts-config.xml:
(parameter中的"recalc=recalculate"意思为标签的property属性值为recalc调用recalculate方法,出于安全考虑能够隐藏后台的业务方法名。"defaule=save"这是可选的,没有配置property属性的标签将调用defaule中设置的方法名,如果defaule没有指定任何参数,则调用Action中的unspecified方法)
action path="/subscription" type="org.example.SubscriptionAction" name="subscriptionForm" scope="request"
input="/subscription.jsp" parameter="save,back,recalc=recalculate,default=save"/>
JSP:
@ page pageEncoding="GBK"%>
@ taglib uri="http://struts.apache.org/tags-html" prefix="html"%>
html>
head>
title>多提交演示title>
head>
body>
html:form action="subscription">
html:submit property="save" value="保存"/>
html:submit property="back" value="后退"/>
html:submit property="recalc" value="重新计算"/>
html:form>
body>
html>
在Action中要有相应的方法:
public class SubscriptionAction extends LookupDispatchAction {
public ActionForward save(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception {}
public ActionForward back(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception {}
public ActionForward recalculate(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception {}
}
MappingDispatchAction
public class MappingDispatchAction extends DispatchAction
它的相应方法的执行由ActionMapping中parameter名决定,注意这里和LookupDispatchAction不同,LookupDispatchAction的相应方法的执行由ActionMapping中parameter属性决定。
struts-config.xml:
action path="/createSubscription" type="org.example.SubscriptionAction" parameter="create">
forward name="success" path="/createSubscription.jsp"/>
action>
action path="/editSubscription" type="org.example.SubscriptionAction" parameter="edit">
forward name="success" path="/editSubscription.jsp"/>
action>
action path="/saveSubscription" type="org.example.SubscriptionAction" parameter="save"
name="subscriptionForm" validate="true" input="/editSubscription.jsp" scope="request">
forward name="success" path="/savedSubscription.jsp"/>
action>
action path="/deleteSubscription" type="org.example.SubscriptionAction" name="subscriptionForm"
scope="request" input="/subscription.jsp" parameter="delete">
forward name="success" path="/deletedSubscription.jsp"/>
action>
action path="/listSubscriptions" type="org.example.SubscriptionAction" parameter="list">
forward name="success" path="/subscriptionList.jsp"/>
action>
在Action中要有相应的方法:
public class SubscriptionAction extends MappingDispatchAction {
public ActionForward create(ActionMapping mapping, ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception {}
public ActionForward edit(ActionMapping mapping, ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception {}
public ActionForward save(ActionMapping mapping, ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception {}
public ActionForward delete(ActionMapping mapping, ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception {}
public ActionForward list(ActionMapping mapping, ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception {}
}
然后可以通过这样的方法来访问你的程序:
http://localhost:8080/myapp/create.do
http://localhost:8080/myapp/edit.do
http://localhost:8080/myapp/save.do
http://localhost:8080/myapp/delete.do
http://localhost:8080/myapp/list.do
如果parameter中参数为空,则调用Action中的unspecified方法
本文来自ChinaUnix博客,如果查看原文请点:http://blog.chinaunix.net/u/21344/showart_2109763.html |
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