struts2中的模型驱

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action中的写法：

public class CategoryAction extends ActionSupport implements ModelDriven<Category>{private static final long serialVersionUID = 1L;private CategoryService cs = new CategoryService();public Category category = new Category(); //创建javabean实例public Category getCategory() {return category;}public void setCategory(Category category) {this.category = category;}@Overridepublic Category getModel() {return category;}public String List(){java.util.List<Category> list = cs.getList();ActionContext.getContext().put("list", list);return "list";}public String add(){cs.add(category);return List();}}

jsp中的写法：

</pre><pre name="code" class="java">

<span style="white-space:pre"></span><s:form action="/category_add" method="post" theme="simple"><s:textfield name="cname"></s:textfield><s:textfield name="cdate"></s:textfield><s:submit value="提交"></s:submit></s:form>

直接使用javabean的属性作为name可以取值与赋值。因为struts2是基于拦截器的，而模型驱动使用的拦截器是ModelDrivenInterceptor。其中的逻辑为：

@Override    public String intercept(ActionInvocation invocation) throws Exception {        Object action = invocation.getAction();        if (action instanceof ModelDriven) {            ModelDriven modelDriven = (ModelDriven) action;            ValueStack stack = invocation.getStack();            Object model = modelDriven.getModel();            if (model !=  null) {            stack.push(model);//将对象置入值栈中            }            if (refreshModelBeforeResult) {                invocation.addPreResultListener(new RefreshModelBeforeResult(modelDriven, model));            }        }        return invocation.invoke();    }

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