- 首先是写一个注解类：
- 接着就是在Interceptor拦截器中实现：
- 再把Interceptor注册到springboot中
- 接着在Controller中加入注解
1.首先是写一个注解类
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
@Retention(RUNTIME)
@Target(METHOD)
public @interface AccessLimit {
int seconds();
int maxCount();
boolean needLogin()default true;
}
- 接着就是在Interceptor拦截器中实现《reids方法可自行封装》
import cn.tolin.springboot.lab1.eum.AccessLimit;
import cn.tolin.springboot.lab1.res.R;
import com.alibaba.fastjson.JSON;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
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.OutputStream;
import java.util.concurrent.TimeUnit;
@Component
public class FangshuaInterceptor extends HandlerInterceptorAdapter {
@Autowired
private StringRedisTemplate redisTemplate;
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//判断请求是否属于方法的请求
if(handler instanceof HandlerMethod){
HandlerMethod hm = (HandlerMethod) handler;
//获取方法中的注解,看是否有该注解
AccessLimit accessLimit = hm.getMethodAnnotation(AccessLimit.class);
if(accessLimit == null){
return true;
}
int seconds = accessLimit.seconds();
int maxCount = accessLimit.maxCount();
boolean login = accessLimit.needLogin();
String key = request.getRequestURI();
//如果需要登录
if (login){
//获取登录的session进行判断
//.....
key+=""+"kou"; //这里假设用户是kou,项目中是动态获取的userId
}
//从redis中获取用户访问的次数
// AccessKey ak = AccessKey.withExpire(seconds);
//Integer count = redisService.get(ak,key,Integer.class);
String s = redisTemplate.opsForValue().get(key);
if (s == null){
//第一次访问
//redisService.set(ak,key,1);
redisTemplate.opsForValue().set(key, "1", seconds, TimeUnit.SECONDS);
} else if (Integer.valueOf(s) < maxCount){
//加1
// redisService.incr(ak,key);
redisTemplate.boundValueOps(key).increment(1);
} else {
//超出访问次数
render(response); //这里的CodeMsg是一个返回参数
return false;
}
}
return true;
}
private void render(HttpServletResponse response)throws Exception {
response.setContentType("application/json;charset=UTF-8");
OutputStream out = response.getOutputStream();
String str = JSON.toJSONString(R.error());
out.write(str.getBytes("UTF-8"));
out.flush();
out.close();
}
}
- 再把Interceptor注册到springboot中
package cn.tolin.springboot.lab1.config;
import cn.tolin.springboot.lab1.interceptor.FangshuaInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
@Configuration
public class FangshuaConfig extends WebMvcConfigurerAdapter {
@Autowired
private FangshuaInterceptor interceptor;
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(interceptor);
}
}
- 接着在Controller中加入注解
import cn.tolin.springboot.lab1.eum.AccessLimit;
import cn.tolin.springboot.lab1.res.R;
import cn.tolin.springboot.lab1.server.UserServer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/usr")
public class UserController {
@Autowired
private UserServer userServer;
@RequestMapping("/list")
@AccessLimit(seconds = 5, maxCount = 5, needLogin = true)
public R list() {
return userServer.list();
}
}
配置
spring:
# datasource 数据源配置内容
datasource:
url: jdbc:mysql://172.29.67.66:3306/demo?useSSL=false&useUnicode=true&characterEncoding=UTF-8
driver-class-name: com.mysql.jdbc.Driver
username: root
password: 秘密
profiles:
active: dev
redis:
port: 6379
host: 192.168.118.128
# mybatis-plus 配置内容
mybatis-plus:
configuration:
map-underscore-to-camel-case: true # 虽然默认为 true ，但是还是显示去指定下。
global-config:
db-config:
id-type: auto # ID 主键自增
logic-delete-value: 1 # 逻辑已删除值(默认为 1)
logic-not-delete-value: 0 # 逻辑未删除值(默认为 0)
mapper-locations: classpath*:mapper/*.xml
type-aliases-package: cn.tolin.springboot.lab1.domain
# logging
logging:
level:
# dao 开启 debug 模式 mybatis 输入 sql
cn:
linxj:
lab01:
mapper: debug
依赖
lab-1-mybatis cn.tolin.springboot.labs 1.0.0 4.0.0 lab-1-mybatis-plus org.springframework.boot spring-boot-starter-web com.baomidou mybatis-plus-boot-starter 3.0.5 org.projectlombok lombok org.springframework.boot spring-boot-starter-jdbc mysql mysql-connector-java 5.1.48 org.springframework.boot spring-boot-starter-data-redis com.alibaba fastjson org.springframework.boot spring-boot-starter-test test
