之前雖然用切面編程實現了redis的模糊查詢,但是卻沒有實現像spring-redis原生的語法一樣的spEl表達式,比如#參數名這種形式,然後在網上找了一些資料,實現了和spring-redis一樣的spEl表達,可以使用#參數名或者#p0這樣的方式,下面是代碼
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.annotation.Resource;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.LocalVariableTableParameterNameDiscoverer;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.expression.ExpressionParser;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;
import org.springframework.stereotype.Component;
import com.kq.highnet2.framework.base.common.annotation.CacheRemove;
@Aspect
@Component
public class CacheRemoveAspect {
Logger logger=LoggerFactory.getLogger(this.getClass());
@Resource(name = "redisTemplate")
RedisTemplate<String, String> redis;
@Pointcut(value = "(execution(* *.*(..)) && "//截獲標有@CacheRemove的方法
+ "@annotation(com.kq.highnet2.framework.base.common.annotation.CacheRemove))")
private void pointcut() {}
@AfterReturning(value = "pointcut()")//切面在方法返回值之後
private void process(JoinPoint joinPoint){
MethodSignature signature = (MethodSignature) joinPoint.getSignature();
Object[] args = joinPoint.getArgs();//切面方法的參數
Method method = signature.getMethod();//切面方法
CacheRemove cacheRemove = method.getAnnotation(CacheRemove.class);//獲得註解
if (cacheRemove != null){
String value = cacheRemove.value();//暫時沒用
String[] keys = cacheRemove.key(); //需要移除的正則key
for(String key:keys) {
logger.info(key);
key = parseKey(key, method, args);
Set<String> keys2 = redis.keys(key);//獲得redis中符合正則的緩存
redis.delete(keys2);//刪除緩存
logger.info("刪除緩存:"+key);
}
}
}
/**
* 獲取緩存的key
* key 定義在註解上,支持SPEL表達式
* @param pjp
* @return
*/
private String parseKey(String key,Method method,Object [] args){
//獲取被攔截方法參數名列表(使用Spring支持類庫)
LocalVariableTableParameterNameDiscoverer u =
new LocalVariableTableParameterNameDiscoverer();
String [] paraNameArr=u.getParameterNames(method);
//使用SPEL進行key的解析
ExpressionParser parser = new SpelExpressionParser();
//SPEL上下文
StandardEvaluationContext context = new StandardEvaluationContext();
//把方法參數放入SPEL上下文中
for(int i=0;i<paraNameArr.length;i++){
context.setVariable(paraNameArr[i], args[i]);
}
List<String> pList = descFormat(key);//獲取#p0這樣的表達式
//將p0作爲參數放入SPEL上下文中
for(String p:pList) {
context.setVariable(p.substring(1), args[Integer.valueOf(p.substring(2))]);
}
return parser.parseExpression(key).getValue(context,String.class);
}
/**
* 提取出#p[數字]這樣的表達式
* @param desc
* @return
*/
private static List<String> descFormat(String desc){
List<String> list = new ArrayList<>();
Pattern pattern = Pattern.compile("#p[0-9]+");
Matcher matcher = pattern.matcher(desc);
while(matcher.find()){
String t = matcher.group(0);
list.add(t);
}
return list;
}
}
這樣就可以和原來@Cacheable等註解上的用法一樣了 @Caching(evict= {
@CacheEvict(value="baseModulePermissionList",key="'baseModulePermissionList'+#userId"),
})
@CacheRemove(value="deletePermission",key = {"'baseButtonPermissionList'+#p0+'*'","'baseViewPermissionList'+#userId+'*'"})
public void evictPermission(String userId) {
}
親測可以使用
完