@Testpublic void test1() throws Exception {//获取ognl对象OgnlContext context = new OgnlContext();//获取根Object root = context.getRoot();Object value = Ognl.getValue("'hello'.length()", context, root);System.out.println(value);}

@Testpublic void test2() throws Exception {//获取ognl对象OgnlContext context = new OgnlContext();//获取根Object root = context.getRoot();Object value = Ognl.getValue("@java.lang.Math@random()", context, root);System.out.println(value);}

<constant name="struts.ognl.allowStaticMethodAccess" value="true"></constant>

@Testpublic void test3() throws Exception {//获取ognl对象OgnlContext context = new OgnlContext();//向上下文中存储数据context.put("username", "jack");//获取根Object root = context.getRoot();Object value = Ognl.getValue("#username", context, root);System.out.println(value);}

@Testpublic void test4() throws Exception {//获取ognl对象OgnlContext context = new OgnlContext();//获取根Object root = context.getRoot();Object value = Ognl.getValue("{'111','222','333'}", context, root);//这里就相当于建立了一个list集合
        System.out.println(value);//把list集合放入root根中
        context.setRoot(value);//获取list中的数据Object value2 = Ognl.getValue("[1]", context, context.getRoot());System.out.println(value2);}

<%@taglib prefix="s" uri="/struts-tags" %>

<s:property value="'hello'.length()"/>
<s:property value="@java.lang.Math@random"/>

@Testpublic void test1() {//通过request获取ValueStack vs = (ValueStack) ServletActionContext.getRequest().getAttribute(ServletActionContext.STRUTS_VALUESTACK_KEY);}

@Testpublic void test2() {//通过actioncontext来获取ActionContext context = ActionContext.getContext();ValueStack valueStack = context.getValueStack();}

<a href="${pageContext.request.contextPath }/Demo3Action">显示商品</a>

public class Demo3Action extends ActionSupport{//封装product的数据public String show() throws Exception {List<Product> list = new ArrayList<>();//模拟数据Product p1 = new Product();p1.setName("电视");p1.setCount(100);p1.setPrice(2000);Product p2 = new Product();p2.setName("冰箱");p2.setCount(200);p2.setPrice(1000);//存储到集合
        list.add(p1);list.add(p2);//保存到值栈中ValueStack vs = ActionContext.getContext().getValueStack();System.out.println(list);vs.set("list", list);return "show";}}

　　　　　<s:iterator value="list"><tr><td><s:property value="name"/></td><td><s:property value="count"/></td><td><s:property value="price"/></td></tr></s:iterator>

execute.executeAction(request, response, mapping);

dispatcher.serviceAction(request, response, mapping);

ActionProxy proxy = getContainer().getInstance(ActionProxyFactory.class).createActionProxy(namespace, name, method, extraContext, true, false);

<interceptors><interceptor name="" class=""></interceptor>
</interceptors>

<interceptors><interceptor name="interceptor1" class=""></interceptor><interceptor name="interceptor2" class=""></interceptor><interceptor-stack name="myStack"><interceptor-ref name="interceptor1"></interceptor-ref><interceptor-ref name="interceptor2"></interceptor-ref></interceptor-stack>
</interceptors>