Spring MethodInterceptor拦截器配置(AOP Around Advice)

一、Spring MethodInterceptor拦截器配置

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import com.oncloudit.shared.util.StringUtil;

public class SQLConvertorInterceptor implements MethodInterceptor {
	
	public String spliceUpdateSQL(String sql) {
		if (!StringUtil.isNotEmpty(sql)) return null;
		
		//1.检查该sql操作的表是否是需要同步的表
		
		//2.检查该sql是否是update操作
		if (sql.contains("UPDATE")) {
			int index = sql.indexOf("SET");
			String a = sql.substring(0, index);
			String c = sql.substring(index + 4);
			sql = a + "SET UPDATE_REASON = 10, " + c;
		}
		return sql;
	}

	@Override
	public Object invoke(MethodInvocation invocation) throws Throwable {
		Object[] args = invocation.getArguments();
		for (int i = 0; i < args.length; i++) {
			Object o = args[i];
			if (o == null || !(o instanceof String)) continue;
			args[i] = spliceUpdateSQL(o.toString());
		}
        return invocation.proceed();
	}
}

二、Spring AOP配置

<bean id="sqlConvertorInterceptor" class="SQLConvertorInterceptor"/>
<aop:config>
	<aop:pointcut id="pointCut" expression="execution(* *.baseOp(..))"/>
	<aop:advisor advice-ref="sqlConvertorInterceptor" pointcut-ref="pointCut"/>
</aop:config>

三、示例

BaseDao baseDao = appContext.getBean("baseDao", BaseDao.class);

baseDao.baseOp("UPDATE t_order_log SET bid = 543, op_time = SYSDATE(), OPERATOR_ID = 500 WHERE bid = 543", null);

使用此配置后该SQL被修改如下, 然后再执行: 

UPDATE t_order_log SET UPDATE_REASON = 10, bid = 543, op_time = SYSDATE(), OPERATOR_ID = 500 WHERE bid = 543