JAVA: OGNL-Ausdruckspraxis

    @Test//准备工作public void fun1() throws Exception{//准备OGNLContext//准备RootUser rootUser = new User("tom",18);//准备ContextMap<String,User> context = new HashMap<String,User>();
            context.put("user1", new User("jack",18));
            context.put("user2", new User("rose",22));
        OgnlContext oc = new OgnlContext();//将rootUser作为root部分        oc.setRoot(rootUser);//将context这个Map作为Context部分        oc.setValues(context);//书写OGNLOgnl.getValue("", oc, oc.getRoot());
    }

        //取出root中user对象的name属性String name = (String) Ognl.getValue("name", oc, oc.getRoot());
        Integer age = (Integer) Ognl.getValue("age", oc, oc.getRoot());
        System.out.println(name);
        System.out.println(age);

        //取出context中键为user1对象的name属性String name = (String) Ognl.getValue("#user1.name", oc, oc.getRoot());
        String name2 = (String) Ognl.getValue("#user2.name", oc, oc.getRoot());
        Integer age = (Integer) Ognl.getValue("#user2.age", oc, oc.getRoot());
        System.out.println(name);
        System.out.println(name2);
        System.out.println(age);

        //将root中的user对象的name属性赋值Ognl.getValue("name='jerry'", oc, oc.getRoot());
        String name = (String) Ognl.getValue("name", oc, oc.getRoot());
        
        String name2 = (String) Ognl.getValue("#user1.name='郝强勇',#user1.name", oc, oc.getRoot());
        System.out.println(name);
        System.out.println(name2);

        //调用root中user对象的setName方法Ognl.getValue("setName('lilei')", oc, oc.getRoot());
        String name = (String) Ognl.getValue("getName()", oc, oc.getRoot());
        String name2 = (String) Ognl.getValue("#user1.setName('lucy'),#user1.getName()", oc, oc.getRoot());
        
        System.out.println(name);
        System.out.println(name2);

        String name = (String) Ognl.getValue("@cn.itheima.a_ognl.HahaUtils@echo('hello 强勇!')", oc, oc.getRoot());//Double pi = (Double) Ognl.getValue("@java.lang.Math@PI", oc, oc.getRoot());Double pi = (Double) Ognl.getValue("@@PI", oc, oc.getRoot());
        System.out.println(name);
        System.out.println(pi);

        //创建list对象Integer size = (Integer) Ognl.getValue("{'tom','jerry','jack','rose'}.size()", oc, oc.getRoot());
        String name = (String) Ognl.getValue("{'tom','jerry','jack','rose'}[0]", oc, oc.getRoot());
        String name2 = (String) Ognl.getValue("{'tom','jerry','jack','rose'}.get(1)", oc, oc.getRoot());    /*System.out.println(size);
        System.out.println(name);
        System.out.println(name2);*///创建Map对象Integer size2 = (Integer) Ognl.getValue("#{'name':'tom','age':18}.size()", oc, oc.getRoot());
        String name3  = (String) Ognl.getValue("#{'name':'tom','age':18}['name']", oc, oc.getRoot());
        Integer age  = (Integer) Ognl.getValue("#{'name':'tom','age':18}.get('age')", oc, oc.getRoot());
        System.out.println(size2);
        System.out.println(name3);
        System.out.println(age);

<action name="Demo3Action" class="cn.itheima.d_config.Demo3Action" method="execute" ><result name="success" type="redirectAction" ><param name="actionName">Demo1Action</param><param name="namespace">/</param><!-- 如果添加的参数struts"看不懂".就会作为参数附加重定向的路径之后.
                     如果参数是动态的.可以使用${}包裹ognl表达式.动态取值                 --><param name="name">${name}</param></result></action>

    public String list() throws Exception {//1 接受参数String cust_name = ServletActionContext.getRequest().getParameter("cust_name");//2 创建离线查询对象DetachedCriteria dc =DetachedCriteria.forClass(Customer.class);//3 判断参数拼装条件if(StringUtils.isNotBlank(cust_name)){
            dc.add(Restrictions.like("cust_name", "%"+cust_name+"%"));
        }//4 调用Service将离线对象传递List<Customer> list = cs.getAll(dc);//5 将返回的list放入request域.转发到list.jsp显示        //ServletActionContext.getRequest().setAttribute("list", list);// 放到ActionContextActionContext.getContext().put("list", list);        return "list";
    }

<s:iterator value="#list" var="cust" >
    <TR         
        style="FONT-WEIGHT: normal; FONT-STYLE: normal; BACKGROUND-COLOR: white; TEXT-DECORATION: none">
        <TD>
            <s:property value="#cust.cust_name" />
        </TD>
        <TD>
        <s:property value="#cust.cust_level" />
        </TD>
        <TD>
        <s:property value="#cust.cust_source" />
        </TD>
        <TD>
        <s:property value="#cust.cust_linkman" />
        </TD>
        <TD>
        <s:property value="#cust.cust_phone" />
        </TD>
        <TD>
        <s:property value="#cust.cust_mobile" />
        </TD>
        <TD>
        <a href="${pageContext.request.contextPath }/customerServlet?method=edit&custId=${customer.cust_id}">修改</a>
          <a href="${pageContext.request.contextPath }/customerServlet?method=delete&custId=${customer.cust_id}">删除</a>
        </TD>
    </TR>
    </s:iterator>
    <%-- <s:iterator value="#list"  >
    <TR         
        style="FONT-WEIGHT: normal; FONT-STYLE: normal; BACKGROUND-COLOR: white; TEXT-DECORATION: none">
        <TD>
            <s:property value="cust_name" />
        </TD>
        <TD>
        <s:property value="cust_level" />
        </TD>
        <TD>
        <s:property value="cust_source" />
        </TD>
        <TD>
        <s:property value="cust_linkman" />
        </TD>
        <TD>
        <s:property value="cust_phone" />
        </TD>
        <TD>
        <s:property value="cust_mobile" />
        </TD>
        <TD>
        <a href="${pageContext.request.contextPath }/customerServlet?method=edit&custId=${customer.cust_id}">修改</a>
          <a href="${pageContext.request.contextPath }/customerServlet?method=delete&custId=${customer.cust_id}">删除</a>
        </TD>
    </TR>
    </s:iterator> --%>