//main.javapublic class Main {    public static void main(String[] args) {        new ActionInvocation().invoke();    }}

//ActionInvocation .javapublic class ActionInvocation {    List<Interceptor> interceptors = new ArrayList<Interceptor>();    int index = -1;    Action a = new Action();        public ActionInvocation() {        this.interceptors.add(new FirstInterceptor());        this.interceptors.add(new SecondInterceptor());            }        public void invoke() {        index ++;        if(index >= this.interceptors.size()) {            a.execute();        }else {                        this.interceptors.get(index).intercept(this);        }    }}

//FirstInterceptor .javapublic class FirstInterceptor implements Interceptor {    public void intercept(ActionInvocation invocation) {        System.out.println(1);        invocation.invoke();        System.out.println(-1);    }}

//SecondInterceptor .javapublic class SecondInterceptor implements Interceptor {    public void intercept(ActionInvocation invocation) {        System.out.println(2);        invocation.invoke();        System.out.println(-2);    }}

//Interceptor .javapublic interface Interceptor {    public void intercept(ActionInvocation invocation) ;}

//Action .javapublic class Action {    public void execute() {        System.out.println("execute!");    }}

//MyInterceptor .javapublic class MyInterceptor implements Interceptor {    public void destroy() {        // TODO Auto-generated method stub            }    public void init() {        // TODO Auto-generated method stub            }    public String intercept(ActionInvocation invocation) throws Exception {        long start = System.currentTimeMillis();        String r = invocation.invoke();        long end = System.currentTimeMillis();        System.out.println("action time = " + (end - start));        return r;    }}

<struts>    <constant name="struts.devMode" value="true"></constant>    <package name="test" namespace="/" extends="struts-default">        <interceptors>            <interceptor name="my" class="com.bjsxt.interceptor.MyInterceptor"></interceptor>        </interceptors>        <action name="test" class="com.bjsxt.action.TestAction">            <result>/test.jsp</result>            <interceptor-ref name="my"></interceptor-ref>            <interceptor-ref name="defaultStack"></interceptor-ref>        </action>    </package></struts>

//方法一
public class MyPointConverter extends DefaultTypeConverter{     @Override    public Object convertValue(Object value, Class toType) {       if(toType == Point.class) {           Point p = new Point();           String[] strs = (String[])value;           String[] xy = strs[0].split(",");           p.x = Integer.parseInt(xy[0]);           p.y = Integer.parseInt(xy[1]);           return p;       }       if(toType == String.class) {           return value.toString();       }       return super.convertValue(value, toType);    } }

//方法二
public class MyPointConverter extends StrutsTypeConverter{



    @Override
    public Object convertFromString(Map context, String[] values, Class toClass) {
        
            Point p = new Point();
            String[] strs = (String[])values;
            String[] xy = strs[0].split(",");
            p.x = Integer.parseInt(xy[0]);
            p.y = Integer.parseInt(xy[1]);
            return p;
        
        
    }

    @Override
    public String convertToString(Map context, Object o) {
        // TODO Auto-generated method stub
        return o.toString();
    }

}