2步:1个配置类,一个实现类.

用拦截器也能实现日志和权限过滤.下面是日志的拦截器,只是获取不了参数值.

package com.yunchuang.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

/**
 * @author 尹冬飞
 * @create 2017-05-03 9:02
 */
@Configuration
public class MyWebAppConfigurer extends WebMvcConfigurerAdapter {
    /**
     * {@inheritDoc}
     * <p>This implementation is empty.
     *
     * @param registry
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new MyInterceptor1()).addPathPatterns("/**");
        registry.addInterceptor(new MyInterceptor2()).addPathPatterns("/**");
        super.addInterceptors(registry);
    }
}

package com.yunchuang.config;

import com.yunchuang.Log;
import com.yunchuang.User;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * @author 尹冬飞
 * @create 2017-05-03 8:59
 */
public class MyInterceptor1 implements HandlerInterceptor {
    Logger logger = LoggerFactory.getLogger(MyInterceptor1.class);

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        if (handler.getClass().isAssignableFrom(HandlerMethod.class)) {
            HandlerMethod handler2 = (HandlerMethod) handler;
            Log annotation = handler2.getMethodAnnotation(Log.class);
            if (annotation != null) {
                HttpSession session = request.getSession();
                User user = (User) session.getAttribute("loginUser");
                String name = user != null ? "[" + user.getName() + "]" : "";
                logger.info(name + "[" + annotation.value() + "][" + handler2.getMethod().getDeclaringClass().getName() + "." + handler2.getMethod().getName() + "][" + request.getRemoteAddr() + "]");
            }
        }
        logger.info("preHandle1");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        logger.info("postHandle1");

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        logger.info("afterCompletion1");
    }
}

package com.yunchuang.config;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author 尹冬飞
 * @create 2017-05-03 9:00
 */
public class MyInterceptor2 implements HandlerInterceptor {
    Logger logger = LoggerFactory.getLogger(MyInterceptor2.class);

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        logger.info("preHandle2");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        logger.info("postHandle2");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        logger.info("afterCompletion2");
    }
}

package com.yunchuang.web;

import com.yunchuang.Log;
import com.yunchuang.User;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpSession;

/**
 * @author 尹冬飞
 * @create 2017-05-02 9:58
 */
@RestController
public class TestController {
    private Logger logger = LoggerFactory.getLogger(TestController.class);

    @GetMapping("/{id}/{a}")
    @Log("点点滴滴")
    public String hello(@PathVariable String id, @PathVariable String a, String dd, HttpSession session) {
        User user=new User();
        user.setName("张三");
        session.setAttribute("loginUser",user);
        //logger.info("--hello--");
        return "123";
    }
}

image.png

如果想实现权限拦截器,思路是自定义一个权限注解,在preHandle方法里有注解的就拦截,判断里面的值是否有权限,有就放行,return true.没有就跳转,return false.跳转语句.

request.getSession().setAttribute("error", "您没有权限");
response.sendRedirect(request.getContextPath()+"/error");