Struts2实现自定义拦截器的三种方式详解

public interface Interceptor extends Serializable{
    void init();
    void destroy();
    String intercept(ActionInvocation invocation) throws Exception;
}

public abstract class AbstractInterceptor implements Interceptor{
    public void init(){}
    public void destroy(){}
    public abstract String intercept (ActionInvocation invocation) throws Exception;
}

public abstract class MethodFilterInterceptor extends AbstractInterceptor {<!--{cke_protected}{C}%3C!%2D%2D%20%2D%2D%3E--> /** * Subclasses must override to implement the interceptor logic. * * @param invocation the action invocation * @return the result of invocation * @throws Exception */ protected abstract String doIntercept(ActionInvocation invocation) throws Exception; }
public abstract class MethodFilterInterceptor extends AbstractInterceptor {
    /**
     * Subclasses must override to implement the interceptor logic.
     * 
     * @param invocation the action invocation
     * @return the result of invocation
     * @throws Exception
     */
    protected abstract String doIntercept(ActionInvocation invocation) throws Exception;
}

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.MethodFilterInterceptor;
//继承:MethodFilterInterceptor 方法过滤拦截器
//功能: 定制拦截器拦截的方法.
//	定制哪些方法需要拦截.
//	定制哪些方法不需要拦截
public class MyInterceptor3 extends MethodFilterInterceptor{
	@Override
	protected String doIntercept(ActionInvocation invocation) throws Exception {
		//前处理
		System.out.println("MyInterceptor3 的前处理!");
		//放行
		String result = invocation.invoke();
		//后处理
		System.out.println("MyInterceptor3 的后处理!");
		return result;
	}
}