SpringBoot AOP控制Redis自动缓存和更新的示例

导入redis的jar包

    
      org.springframework.boot
      spring-boot-starter-data-redis
      2.0.4.RELEASE
    

编写自定义缓存注解

@documented
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface RedisCache {
}

编写切面类

package com.ys.edu.aop;
import com.ys.edu.utils.ResultUtils;
import org.apache.log4j.Logger;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import org.springframework.stereotype.Service;
import org.aspectj.lang.reflect.MethodSignature;
import javax.annotation.Resource;
import java.util.Arrays;
import java.util.Set;
import java.util.concurrent.TimeUnit;

@Aspect
@Service
public class RedisAOP {
  private static final Logger logger = Logger.getLogger(RedisAOP.class);
  private static final Integer TIME_OUT = 30 ; //redis 存活时长 分钟
  @Resource
  private RedisTemplate redisTemplate;
  
  @Pointcut("@within(com.ys.edu.annotation.RedisCache)")
  public void queryCachePointcut(){
  }
  @Around("queryCachePointcut()")
  public Object Interceptor(ProceedingJoinPoint joinPoint) throws Throwable{
    long beginTime = System.currentTimeMillis();
    MethodSignature signature = (MethodSignature) joinPoint.getSignature();
    //类路径名
    String classPathName = joinPoint.getTarget().getClass().getName();
    //类名
    String className = classPathName.substring(classPathName.lastIndexOf(".")+1,classPathName.length());
    //获取方法名
    String methodName = signature.getMethod().getName();
    String[] strings = signature.getParameterNames();
    String key = className+"_"+methodName+"_"+Arrays.toString(strings);
    if((methodName.indexOf("select") != -1 && methodName.substring(0,6).equalsIgnoreCase("select")) || (methodName.indexOf("query") != -1 && methodName.substring(0,5).equalsIgnoreCase("query")) || (methodName.indexOf("get") != -1 && methodName.substring(0,3).equalsIgnoreCase("get"))){
      Object data = getObject(beginTime,joinPoint,key);
      if(data != null){
 return ResultUtils.success(data);
      }
      return joinPoint.proceed();
    }else if((methodName.indexOf("add") != -1 && methodName.substring(0,3).equalsIgnoreCase("add")) || (methodName.indexOf("insert") != -1 && methodName.substring(0,6).equalsIgnoreCase("insert")) || (methodName.indexOf("update") != -1 && methodName.substring(0,6).equalsIgnoreCase("update"))){
      Set keys = redisTemplate.keys(className+"*");
      redisTemplate.delete(keys);
      logger.warn("执行方法 : [ "+methodName+" ] : 清除 key 包含 [ "+className+" ] 的缓存数据");
      logger.warn("AOP 缓存切面处理 >>>> end 耗时：" + (System.currentTimeMillis() - beginTime));
    }
    // 调用原始方法
    return joinPoint.proceed();
  }
  
  private Object getObject(long beginTime,ProceedingJoinPoint joinPoint,String key) throws Throwable {
    ValueOperations operations = redisTemplate.opsForValue();
    boolean hasKey = redisTemplate.hasKey(key);
    Object object = null;
    if(hasKey){
      // 缓存中获取到数据，直接返回。
      object = operations.get(key);
      logger.warn("从缓存中获取到 key 为 ["+key+" ] : 的数据 >>>> " + object.toString());
      logger.warn("AOP 缓存切面处理 >>>> end 耗时：" + (System.currentTimeMillis() - beginTime));
      return object;
    }
    if(object == null) {
      // 缓存中没有数据，调用原始方法查询数据库
      object = joinPoint.proceed();
      operations.set(key, object, TIME_OUT, TimeUnit.MINUTES); // 设置超时时间30分钟
      logger.warn("向 Redis 添加 key 为 ["+key+" ] , 存活时长为 "+TIME_OUT+" min 的数据 >>>> " + object.toString());
      logger.warn("AOP 缓存切面处理 >>>> end 耗时：" + (System.currentTimeMillis() - beginTime));
    }
    return object;
  }
  @Autowired(required = false)
  public void setRedisTemplate(RedisTemplate redisTemplate) {
    RedisSerializer stringSerializer = new StringRedisSerializer();//序列化为String
    Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);//序列化为Json
    redisTemplate.setKeySerializer(stringSerializer);
    redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
    redisTemplate.setHashKeySerializer(stringSerializer);
    redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);
    this.redisTemplate = redisTemplate;
  }
}

在想要使用redis缓存的controller类上添加 @RedisCache 注解.

切面方法则会切以select/get/query 开头的查询方法,获取方法名和参数拼接为key,存到redis.

在执行add/insert/update 开头的方法时,则清空该类下的所有缓存.

方法返回值格式统一实体类:

package com.ys.edu.bean;
import java.io.Serializable;

public class ResultBody implements Serializable {
  private static final long serialVersionUID = 694858559908048578L;
  private Integer code;
  private String msg;
  private Integer count = 0;
  private T data;
  public ResultBody(){}
  public ResultBody(Integer code, String msg,Integer count,T data) {
    this.code = code;
    this.msg = msg;
    this.count = count;
    this.data = data;
  }
  public ResultBody(Integer code, String msg,T data) {
    this.code = code;
    this.msg = msg;
    this.data = data;
  }
  
  public ResultBody success(){
    return success((T) null);
  }
  
  public ResultBody success(Integer count,T data){
    return new ResultBody(0,"请求成功!",count,data);
  }
  
  public ResultBody success(String msg,Integer count,T data){
    return new ResultBody(0,msg,count,data);
  }
  
  public ResultBody success(T data){
    return new ResultBody(0,"请求成功!",data);
  }
  
  public ResultBody success(String msg,T data){
    return new ResultBody(0,msg,data);
  }
  
  public ResultBody success(Code code,T data){
    return new ResultBody(code.getCode(),code.getMsg(),data);
  }
  
  public ResultBody success(Code code){
    return new ResultBody(code.getCode(),code.getMsg(),null);
  }
  
  public ResultBody error(Integer code,String msg){
    return new ResultBody(code,msg,null);
  }
  
  public ResultBody error(Code code){
    return new ResultBody(code.getCode(),code.getMsg(),null);
  }
  public Integer getCode() {
    return code;
  }
  public void setCode(Integer code) {
    this.code = code;
  }
  public String getMsg() {
    return msg;
  }
  public void setMsg(String msg) {
    this.msg = msg;
  }
  public Integer getCount() {
    return count;
  }
  public void setCount(Integer count) {
    this.count = count;
  }
  public T getData() {
    return data;
  }
  public void setData(T data) {
    this.data = data;
  }
}

自定义提示枚举类:

package com.ys.edu.bean;

public enum Code {
  
  SUCCESS(0,"请求成功"),
  ERROR(-1,"请求错误");
  private Integer code;
  private String msg;
  public Integer getCode() {
    return code;
  }
  public void setCode(Integer code) {
    this.code = code;
  }
  public String getMsg() {
    return msg;
  }
  public void setMsg(String msg) {
    this.msg = msg;
  }
  Code(Integer code, String msg){
    this.code = code;
    this.msg = msg;
  }
}

返回结果工具类:

package com.ys.edu.utils;
import com.ys.edu.bean.Code;
import com.ys.edu.bean.ResultBody;
import com.ys.edu.entity.Page;
import java.util.HashMap;
import java.util.Map;

public class ResultUtils {
  
  public static ResultBody success(){
    return success((Object)null);
  }
  public static ResultBody success(Object object){
    return success(0,object);
  }
  
  public static ResultBody success(Integer count,Object object){
    return new ResultBody().success(count,object);
  }
  
  public static ResultBody success(String msg,Integer count,Object object){
    return new ResultBody().success(msg,count,object);
  }
  
  public static ResultBody success(Code code,Object object){
    return new ResultBody().success(code,object);
  }
  
  public static ResultBody success(Code code){
    return new ResultBody().success(code);
  }
  
  public static ResultBody error(Integer code,String msg){
    return new ResultBody().error(code,msg);
  }
  
  public static ResultBody error(Code code){
    return new ResultBody().error(code);
  }
  
  public static ResultBody successByLimit(Integer page,Integer limit,Integer totalNum,Integer curCount,Object object){
    Map map = new HashMap<>();
    Page pageInfo = new Page();
    pageInfo.setPage(page);
    pageInfo.setLimit(limit);
    pageInfo.setTotalNum(totalNum);
    pageInfo.setTotalPages((totalNum + limit - 1)/limit);
    map.put("page",pageInfo);
    map.put("data",object);
    return success(curCount,map);
  }
}

总结

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