53.数据访问-Redis操作与统计小实验

相关Redis配置：

spring:
  redis:
#   url: redis://lfy:Lfy123456@r-bp1nc7reqesxisgxpipd.redis.rds.aliyuncs.com:6379
    host: r-bp1nc7reqesxisgxpipd.redis.rds.aliyuncs.com
    port: 6379
    password: lfy:Lfy123456
    client-type: jedis
    jedis:
      pool:
        max-active: 10
#   lettuce:# 另一个用来连接redis的java框架
#      pool:
#        max-active: 10
#        min-idle: 5

测试Redis连接：

@SpringBootTest
public class Boot05WebAdminApplicationTests {

    @Autowired
    StringRedisTemplate redisTemplate;

    @Autowired
    RedisConnectionFactory redisConnectionFactory;

    @Test
    void testRedis(){
        ValueOperations<String, String> operations = redisTemplate.opsForValue();

        operations.set("hello","world");

        String hello = operations.get("hello");
        System.out.println(hello);

        System.out.println(redisConnectionFactory.getClass());
    }

}

Redis Desktop Manager：可视化Redis管理软件。

URL统计拦截器：

@Component
public class RedisUrlCountInterceptor implements HandlerInterceptor {

    @Autowired
    StringRedisTemplate redisTemplate;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String uri = request.getRequestURI();

        //默认每次访问当前uri就会计数+1
        redisTemplate.opsForValue().increment(uri);

        return true;
    }
}

注册URL统计拦截器：

@Configuration
public class AdminWebConfig implements WebMvcConfigurer{

    @Autowired
    RedisUrlCountInterceptor redisUrlCountInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {

        registry.addInterceptor(redisUrlCountInterceptor)
                .addPathPatterns("/**")
                .excludePathPatterns("/","/login","/css/**","/fonts/**","/images/**",
                        "/js/**","/aa/**");
    }
}

Filter、Interceptor 几乎拥有相同的功能？

Filter是Servlet定义的原生组件，它的好处是脱离Spring应用也能使用。
Interceptor是Spring定义的接口，可以使用Spring的自动装配等功能。
调用Redis内的统计数据：

@Slf4j
@Controller
public class IndexController {

    @Autowired
    StringRedisTemplate redisTemplate;
    
    @GetMapping("/main.html")
    public String mainPage(HttpSession session,Model model){

        log.info("当前方法是：{}","mainPage");

        ValueOperations<String, String> opsForValue =
                redisTemplate.opsForValue();

        String s = opsForValue.get("/main.html");
        String s1 = opsForValue.get("/sql");

        model.addAttribute("mainCount",s);
        model.addAttribute("sqlCount",s1);

        return "main";
    }
}