AOP底層，就是採用動態代理模式實現的。本文通過aop實現對dao層執行時間進行增強，打印出sql方法執行時間，可以對執行慢sql進行排查優化。

1 切面類

package com.ultrapower.nettech.obm.server.aop;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
 

import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
import org.springframework.stereotype.Component;

import com.ultrapower.nettech.obm.server.config.DataSourceContextHolder;
import com.ultrapower.nettech.obm.server.config.DataSourceType;
 


@Aspect
@EnableAspectJAutoProxy(proxyTargetClass=true)
@Component
public class SqlTimeAop {
	@Around("execution(* com.ultrapower.nettech.obm.server.dao..*.*(..)) "
			+ " and @annotation(com.ultrapower.nettech.obm.server.config.SqlTime) ")
	public Object  setReadDataSourceType(ProceedingJoinPoint joinPoint)
 
 {
		//System.out.println("------------sqltimebefore-----------");
		 	Object obj = null;
	        Object[] args = joinPoint.getArgs();
	        long startTime = System.currentTimeMillis();
	        try {
	            obj = joinPoint.proceed(args);
	        } catch (Throwable e) {
	            //logger.error("統計某方法執行耗時環繞通知出錯", e);
	        }
	        long endTime = System.currentTimeMillis();       
	        MethodSignature signature = (MethodSignature) joinPoint.getSignature();        
	        String methodName = signature.getDeclaringTypeName() + "." + signature.getName();         // 列印耗時的資訊        
	        this.printExecTime(methodName, startTime, endTime);        
	        return obj;   

	       
	}

	private void printExecTime(String methodName, long startTime, long endTime) {
		System.out.println(methodName+"執行時間:"+(endTime-startTime)+"毫秒");
		
	}
}

2 註解類

package com.ultrapower.nettech.obm.server.config;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Inherited
@Documented
public @interface SqlTime {
}

3 aop增強方法

		@SqlTime
	public int updateDictStatusTable(DictStatusTable  DictStatusTable){
		int state = dictStatusTableMapper.updateByPrimaryKey(DictStatusTable);
		return state;
	}

4 測試類

@Autowired
	DictStatusTableService dictStatusTableService;
	@Test
	public void testDictStatus(){
		DictStatusTable dt = new DictStatusTable();
		dt.setObjectid("2222");
		dt.setObjecttype("host");
		dt.setObjectname("測試");
		dt.setObjectalias("IBM");
		dt.setType("ceshi");
		dt.setStype("marjor2");
		dt.setInfo("warn");
		//dt.setCtdata(new Timestamp(System.currentTimeMillis()));
		//dt.setUpdata(new Timestamp(System.currentTimeMillis()));
//		dictStatusTableService.addDictStatusTable(dt);
		dictStatusTableService.updateDictStatusTable(dt);
		//dictStatusTableService.deleteDictStatusTable("2222");
	}

5 測試結果