Struts2 Part2

xiaoxiao2021-02-28 84

原作者:尚硅谷-佟刚

ValueStack

在 ValueStack 对象的内部有两个逻辑部分: ObjectStack: Struts 把 Action 和相关对象压入 ObjectStack 中 ContextMap: Struts 把各种各样的映射关系(一些 Map 类型的对象) 压入 ContextMap 中. 实际上就是对 ActionContext 的一个引用

ObjectStack:

MapStack: Struts 会把下面这些映射压入 ContextMap 中 parameters: 该 Map 中包含当前请求的请求参数 request: 该 Map 中包含当前 request 对象中的所有属性 session: 该 Map 中包含当前 session 对象中的所有属性 application:该 Map 中包含当前 application 对象中的所有属性 attr: 该 Map 按如下顺序来检索某个属性:pageContext, request, session, application

<% String[] names=new String[]{"aa","bb","cc","dd"}; pageContext.setAttribute("names",names); %> length:<s:property value="#attr.names.length"/> names[2]:<s:property value="#attr.names[2]"/> <% Map<String,String> letters=new HashMap<String,String>(); request.setAttribute("letters",letters); letters.put("AA","a"); letters.put("BB","b"); letters.put("CC","c"); %>  <s:property value="#request.letters.size"/> AA:<s:property value="#request['letters']['AA']"/>

StrutsTag

表单标签:

<% List<City> cities=new ArrayList<City>(); cities.add(new City(1,"北京")); cities.add(new City(2,"北京")); cities.add(new City(3,"北京")); cities.add(new City(4,"北京")); pageContext.setAttribute("cities", cities); %> <s:form action="save" theme="xhtml"> <s:hidden name="userId"/> <s:textfield name="userName" label="UserName"/> <s:password name="password" label="Password" showPassword="true"/> <s:textarea name="desc" label="Desc"/> <s:checkbox name="married" label="Married"/> <s:radio name="gender" list="#{'1':'Male','0':'Female' }" label="Gender"/>  <s:checkboxlist name="cities" list="#attr.cities" listKey="cityId" listValue="cityName" label="City"/> <s:select list="{11,12,13,14,15,16,17,18,19,20}" headerKey="" headerValue="请选择" name="age" label="Age">  <s:optgroup label="21-30" list="#{21:21,22:22}"/> <s:optgroup label="31-40" list="#{31:31,32:32}"/> </s:select> <s:submit/> </s:form>

通用标签:

<s:url value="/getProduct" var="url3">  <s:param name="productId" value="'GGGGKKK'"/> </s:url> ${url3 }  <s:url action="testAction" namespace="/helloWorld" method="save" var="url4"> <s:param name="name" value="'sss'"/> </s:url> ${url4 }  <s:url value="/testUrl" var="url5" includeParams="get"/> ${url5 }

s:set:向page,request,session,application域对象中加入一个属性值  <s:set name="productName1" value="productName" scope="request"/> <s:property value="#request.productName1"/> s:push:把一个对象在标签开始后压入到值栈中,标签结束时,弹出值栈 <% Person person=new Person(); person.setName("atguigu"); person.setAge(11); request.setAttribute("person", person); %> <s:push value="#request.person"> <s:property value="name"/> ----${name }---- </s:push> <s:if test="#request.person.age>10"> 大于10岁 </s:if> <s:else> 小于或等于10岁. </s:else>

s:iterator:遍历集合的,把这个可遍历对象里的每一个元素依次压入和弹出 <% List<Person> persons=new ArrayList<Person>(); persons.add(new Person("AA",10)); persons.add(new Person("BB",20)); persons.add(new Person("CC",30)); persons.add(new Person("DD",40)); persons.add(new Person("EE",50)); request.setAttribute("persons", persons); %> <s:iterator value="#request.persons" status="status" var="temp"> index:${status.index }--count:${status.count }--<s:property value="#request.temp.name"/>----<s:property value="#request['temp']['age']"/> </s:iterator>

s:sort :可以对集合中的元素进行排序 <% PersonComparator pc=new PersonComparator(); request.setAttribute("comparator", pc); %> <s:sort comparator="#request.comparator" source="#request.persons" var="persons2"/> <s:iterator value="#attr.persons2"> <s:property value="name"/>---<s:property value="age"/> </s:iterator>

s:date 可以对Date对象进行排版 <s:date name="#session.date" format="yyyy-MM-dd HH:mm:ss" var="date2"/> s:date<s:property value="#request.date2"/> <s:iterator value="persons">  <s:a href="getPerson.action?name=%{name}">${name }</s:a> </s:iterator>

Interceptor

defaultStack

<interceptor-stack name="defaultStack"> <interceptor-ref name="exception"/> <interceptor-ref name="alias"/> <interceptor-ref name="servletConfig"/> <interceptor-ref name="i18n"/> *** 1. <interceptor-ref name="prepare"/> *** <interceptor-ref name="chain"/> <interceptor-ref name="scopedModelDriven"/> <*** 2. interceptor-ref name="modelDriven"/> *** <interceptor-ref name="fileUpload"/> <interceptor-ref name="checkbox"/> <interceptor-ref name="datetime"/> <interceptor-ref name="multiselect"/> <interceptor-ref name="staticParams"/> <interceptor-ref name="actionMappingParams"/> *** 3. <interceptor-ref name="params"/> *** <interceptor-ref name="conversionError"/> <interceptor-ref name="validation"> <param name="excludeMethods">input,back,cancel,browse</param> </interceptor-ref> <interceptor-ref name="workflow"> <param name="excludeMethods">input,back,cancel,browse</param> </interceptor-ref> <interceptor-ref name="debugging"/> <interceptor-ref name="deprecation"/> </interceptor-stack>

paramsPrepareParamsStack

<interceptor-stack name="paramsPrepareParamsStack"> <interceptor-ref name="exception"/> <interceptor-ref name="alias"/> <interceptor-ref name="i18n"/> <interceptor-ref name="checkbox"/> <interceptor-ref name="datetime"/> <interceptor-ref name="multiselect"/> *** 1. <interceptor-ref name="params"/> *** <interceptor-ref name="servletConfig"/> *** 2. <interceptor-ref name="prepare"/> *** <interceptor-ref name="chain"/> *** 3. <interceptor-ref name="modelDriven"/> *** <interceptor-ref name="fileUpload"/> <interceptor-ref name="staticParams"/> <interceptor-ref name="actionMappingParams"/> *** 4. <interceptor-ref name="params"/> *** <interceptor-ref name="conversionError"/> <interceptor-ref name="validation"> <param name="excludeMethods">input,back,cancel,browse</param> </interceptor-ref> <interceptor-ref name="workflow"> <param name="excludeMethods">input,back,cancel,browse</param> </interceptor-ref> </interceptor-stack>

<interceptors> <interceptor-stack name="atguiguStack"> <interceptor-ref name="paramsPrepareParamsStack"> <param name="prepare.alwaysInvokePrepare">false</param> </interceptor-ref> </interceptor-stack> </interceptors> <default-interceptor-ref name="atguiguStack" />

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