SpringBoot AOP控制Redis自动缓存和更新

导入redis的jar包

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
<version>2.0.4.RELEASE</version>
</dependency>

编写自定义缓存注解

/**
* @Description: redis缓存注解编写在需要缓存的类上
**/
@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;

/**
* @ClassName RedisAOP
* @description: redis 切面缓存
**/
@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;

/**
* @Title: queryCachePointcut
* @Description: 定义切点为缓存注解
* @return void
**/
@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<String> 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();
}

/**
* @Title: getObject
* @Description: 使用key获取数据不存在则查询添加
* @param beginTime : 切面开始时间
* @param joinPoint : 切面对象
* @param key : 获取redis数据的key值
* @return java.lang.Object
**/
private Object getObject(long beginTime,ProceedingJoinPoint joinPoint,String key) throws Throwable {
ValueOperations<String, Object> 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;

/**
* @ClassName ResultBody
* @description: RestFul API 方法返回值格式统一实体类
**/
public class ResultBody<T> 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;
}

/**
* @Title: success
* @Description: 成功 (无参) 默认 code : " 0 " msg : "请求成功" , count : 0 , data: null
* @date 2018/11/29 10:28
**/
public ResultBody success(){
return success((T) null);
}

/**
* @Title: success
* @Description: 成功默认 code : " 0 " msg : "请求成功"
* @param count : 数据条数
* @param data : 数据
* @date 2018/11/29 11:46
**/
public ResultBody success(Integer count,T data){
return new ResultBody(0,"请求成功!",count,data);
}

/**
* @Title: success
* @Description: 成功默认 code : " 0 "
* @param msg : 提示信息
* @param count : 数据条数
* @param data : 数据
**/
public ResultBody success(String msg,Integer count,T data){
return new ResultBody(0,msg,count,data);
}

/**
* @Title: success
* @Description: 成功默认 code : " 0 " , msg : "请求成功"
* @param data : 数据
**/
public ResultBody success(T data){
return new ResultBody(0,"请求成功!",data);
}

/**
* @Title: success
* @Description: 成功默认 code : " 0 "
* @param msg : 提示信息
* @param data : 数据
* @date 2018/11/29 11:47
**/
public ResultBody success(String msg,T data){
return new ResultBody(0,msg,data);
}

/**
* @Title: success
* @Description: 成功默认 code : " 0 "
* @param code : 枚举类代码
* @param data : 数据
**/
public ResultBody success(Code code,T data){
return new ResultBody(code.getCode(),code.getMsg(),data);
}

/**
* @Title: success
* @Description: 成功默认 code : " 0 "
* @param code : 枚举类代码
**/
public ResultBody success(Code code){
return new ResultBody(code.getCode(),code.getMsg(),null);
}

/**
* @Title: error
* @Description: 错误默认 data : null
* @param code : 错误代码
* @param msg : 错误信息
**/
public ResultBody error(Integer code,String msg){
return new ResultBody(code,msg,null);
}

/**
* @Title: error
* @Description: 错误默认 data : null
* @param code : 枚举类错误代码
**/
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;

/**
* @ClassName Code
* @description: 自定义提示枚举类
**/
public enum Code {

/**
* @Description: 请求状态码
**/
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;

/**
* @ClassName ResultUtils
* @description: 返回结果工具类
**/
public class ResultUtils {

/**
* @Title: success
* @Description: 无参成功返回默认值 code : "0" , msg : "请求成功" , count : 0 , data : null
**/
public static ResultBody success(){
return success((Object)null);
}

public static ResultBody success(Object object){
return success(0,object);
}

/**
* @Title: success
* @Description: 有参成功返回默认值 code : "0" , msg : "请求成功"
* @param count : 数据条数
* @param object : 数据
**/
public static ResultBody success(Integer count,Object object){
return new ResultBody().success(count,object);
}

/**
* @Title: success
* @Description: 有参成功返回默认值 code : "0"
* @param msg : 提示信息
* @param count : 数据条数
* @param object : 数据
**/
public static ResultBody success(String msg,Integer count,Object object){
return new ResultBody().success(msg,count,object);
}

/**
* @Title: error
* @Description: 有参成功返回默认值 code : "0"
* @param code :
* @param object : 数据
**/
public static ResultBody success(Code code,Object object){
return new ResultBody().success(code,object);
}

/**
* @Title: error
* @Description: 有参成功返回默认值 code : "0" data : null
* @param code : 枚举类代码
**/
public static ResultBody success(Code code){
return new ResultBody().success(code);
}

/**
* @Title: error
* @Description: 错误返回格式默认值 data : null
* @param code : 错误代码
**/
public static ResultBody error(Integer code,String msg){
return new ResultBody().error(code,msg);
}

/**
* @Title: error
* @Description: 错误返回格式默认值 data : null
* @param code : 枚举类错误代码
**/
public static ResultBody error(Code code){
return new ResultBody().error(code);
}

/**
* @Title: successByLimit
* @Description: 分页返回数据格式
* @param page : 查询的页数
* @param limit : 查询的条数
* @param totalNum : 数据总条数
* @param curCount : 当前页条数
* @param object : 查询结果数据
**/
public static ResultBody successByLimit(Integer page,Integer limit,Integer totalNum,Integer curCount,Object object){
Map<String,Object> 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);
}

}

SpringBoot AOP控制Redis自动缓存和更新

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