Spring实现自定义注解并且配置拦截器进行拦截

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.RetentionPolicy.RUNTIME;

/**
 * 自定义注解 表示该方法需要token
 */
@Retention(RUNTIME)
@Target({ElementType.METHOD})
@Documented
public @interface NeedToken {
}

import net.sf.json.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

/**
 * token请求拦截器
 */
public class TokenInterceptor extends HandlerInterceptorAdapter {



    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        if (handler instanceof HandlerMethod){
            HandlerMethod handlerMethod= (HandlerMethod) handler;
            Method method=handlerMethod.getMethod();
            NeedToken needToken=method.getAnnotation(NeedToken.class);
            if (needToken!=null){
                //存在注解
                

            }
        }

        return true;
    }


   

}

<bean id="tokenInterceptor" class="com.test.TokenInterceptor"/>
    
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping">
        <property name="interceptors">
            <list>
                <ref bean="tokenInterceptor"/>
            </list>
        </property>
    </bean>
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
        <property name="messageConverters">
            <list>
                <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" />
            </list>
        </property>
    </bean>

 　　@RequestMapping(value = "/showx")
    @NeedToken  //增加注解
    public void show(){

        return null;
    }