spring AOP 抽取redis实例

1. 定义注解

package com.efoxconn.ipebg.common.annotation;  
  
import java.lang.annotation.ElementType;  
import java.lang.annotation.Retention;  
import java.lang.annotation.RetentionPolicy;  
import java.lang.annotation.Target;  
  
@Target({ElementType.METHOD, ElementType.TYPE})  
@Retention(RetentionPolicy.RUNTIME)  
public @interface RedisValid {  
    public String key() default "halfHour";  
}

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2. 创建处理类

package com.efoxconn.ipebg.common.util;
import java.lang.reflect.Method;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import javax.annotation.Resource;
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.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;
import com.efoxconn.ipebg.common.annotation.RedisValid;
/**
 * 抽取redis统一处理
 * 2016-11-25 17:57:31
 */
@Aspect
@Component
@SuppressWarnings({ "rawtypes", "unchecked" })
public class CacheAspect {
@Resource
private CacheUtil cacheUtil;
// 定义切入点
@Pointcut("execution(public * com.efoxconn.ipebg.protoline.service..*.*(..))")
public void weavingRedis() { }
// 环绕增强处理方法
@Around("weavingRedis()")
public Object weavingRedisCalls(ProceedingJoinPoint pjp) throws Throwable {
// 得到目标方法的参数
Object[] p = pjp.getArgs();
List result = null;
// 得到目标的class
Class<?> clazz =  pjp.getTarget().getClass();
// 得到目标方法的签名
String methodName = pjp.getSignature().getName();
String key = "";
// 如果有参数,计算出key
if (p != null && p.length > 0) {
Map params = (Map) p[0];
key = createKey(params, clazz.getSimpleName(), methodName);
}else{
key = clazz.getSimpleName() +  methodName;
}
// 先从redis中取值
result = cacheUtil.getObject(key);
// 如果redis中没有
if (result == null||result.size() == 0) {
// 放开去执行
result = (List) pjp.proceed();
String valid = "halfHour";
// 得到注解的redis有效时长
       MethodSignature msig = (MethodSignature) pjp.getSignature();
       Method method = clazz.getMethod(methodName, msig.getParameterTypes());
RedisValid redisValid = null;
if(clazz.isAnnotationPresent(RedisValid.class)){
redisValid=clazz.getAnnotation(RedisValid.class);
}else if (method.isAnnotationPresent(RedisValid.class)) {
redisValid=method.getAnnotation(RedisValid.class);
}
if (redisValid!=null) {
valid = redisValid.key();
}
// 存redis
cacheUtil.setObject(key, result, RedisValidConfig.getRedisValid(valid));
}
return result;
}
// cacheUtil中的原有计算key的逻辑 (稍加工)
private String createKey(Map<String, ?> m, String className,
String methodName) {
StringBuffer appendStr = new StringBuffer(className + "_" + methodName);
List<String> keys = new LinkedList<String>();
List<String> values = new LinkedList<String>();
for (String str : m.keySet()) {
keys.add(str);
if (m.get(str) != null) {
values.add(m.get(str).toString().replace(" ", "")
.replace(",", ""));
} else {
values.add("");
}
}
for (int i = 0; i < values.size(); i++) {
for (int j = i; j < values.size(); j++) {
if (values.get(i).length() > values.get(j).length()) {
String s = keys.get(i);
keys.set(i, keys.get(j));
keys.set(j, s);
String o = values.get(i);
values.set(i, values.get(j));
values.set(j, o);
}
}
}
for (int i = 0; i < values.size(); i++) {
if (values.get(i) != null && !("").equals(values.get(i))) {
appendStr.append("_" + values.get(i).toString());
}
}
return appendStr.toString();
}
}

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3. 配置AOP
在applicationContext.xml中添加

<aop:aspectj-autoproxy />