使用Spring进行统一日志管理 + 统一异常管理

统一日志和异常管理配置好后，SSH项目中，代码以往散落的log.info() 和 try..catch..finally 再也不见踪影！

统一日志异常实现类：

package com.pilelot.web.util;

import org.apache.log4j.Logger;
import org.springframework.aop.ThrowsAdvice;
import org.springframework.dao.DataAccessException;

import java.io.IOException;
import java.lang.reflect.Method;
import java.sql.SQLException;

/**
 * 由Spring AOP调用 输出异常信息，把程序异常抛向业务异常
 *
 * @author Andy Chan
 *
 */
public class ExceptionAdvisor implements ThrowsAdvice
{
public void afterThrowing(Method method, Object[] args, Object target,
Exception ex) throws Throwable
{
// 在后台中输出错误异常异常信息，通过log4j输出。
Logger log = Logger.getLogger(target.getClass());
log.info("**************************************************************");
log.info("Error happened in class: " + target.getClass().getName());
log.info("Error happened in method: " + method.getName());
for (int i = 0; i < args.length; i++)
{
log.info("arg[" + i + "]: " + args[i]);
}
log.info("Exception class: " + ex.getClass().getName());
log.info("ex.getMessage():" + ex.getMessage());
ex.printStackTrace();
log.info("**************************************************************");

// 在这里判断异常，根据不同的异常返回错误。
if (ex.getClass().equals(DataAccessException.class))
{
ex.printStackTrace();
throw new BusinessException("数据库操作失败！");
} else if (ex.getClass().toString().equals(
NullPointerException.class.toString()))
{
ex.printStackTrace();
throw new BusinessException("调用了未经初始化的对象或者是不存在的对象！");
} else if (ex.getClass().equals(IOException.class))
{
ex.printStackTrace();
throw new BusinessException("IO异常！");
} else if (ex.getClass().equals(ClassNotFoundException.class))
{
ex.printStackTrace();
throw new BusinessException("指定的类不存在！");
} else if (ex.getClass().equals(ArithmeticException.class))
{
ex.printStackTrace();
throw new BusinessException("数学运算异常！");
} else if (ex.getClass().equals(ArrayIndexOutOfBoundsException.class))
{
ex.printStackTrace();
throw new BusinessException("数组下标越界!");
} else if (ex.getClass().equals(IllegalArgumentException.class))
{
ex.printStackTrace();
throw new BusinessException("方法的参数错误！");
} else if (ex.getClass().equals(ClassCastException.class))
{
ex.printStackTrace();
throw new BusinessException("类型强制转换错误！");
} else if (ex.getClass().equals(SecurityException.class))
{
ex.printStackTrace();
throw new BusinessException("违背安全原则异常！");
} else if (ex.getClass().equals(SQLException.class))
{
ex.printStackTrace();
throw new BusinessException("操作数据库异常！");
} else if (ex.getClass().equals(NoSuchMethodError.class))
{
ex.printStackTrace();
throw new BusinessException("方法末找到异常！");
} else if (ex.getClass().equals(InternalError.class))
{
ex.printStackTrace();
throw new BusinessException("Java虚拟机发生了内部错误");
} else
{
ex.printStackTrace();
throw new BusinessException("程序内部错误，操作失败！" + ex.getMessage());
}
}
}

自定义业务异常处理类 友好提示：

package com.pilelot.web.util;

/**
 * 自定义业务异常处理类    友好提示
 * @author Andy Chan
 *
 */
public class BusinessException extends RuntimeException
{
private static final long serialVersionUID = 3152616724785436891L;

public BusinessException(String frdMessage)
{
super(createFriendlyErrMsg(frdMessage));
}

public BusinessException(Throwable throwable)
{
super(throwable);
}

public BusinessException(Throwable throwable, String frdMessage)
{
super(throwable);
}

private static String createFriendlyErrMsg(String msgBody)
{
String prefixStr = "抱歉，";
String suffixStr = " 请稍后再试或与管理员联系！";

StringBuffer friendlyErrMsg = new StringBuffer("");

friendlyErrMsg.append(prefixStr);

friendlyErrMsg.append(msgBody);

friendlyErrMsg.append(suffixStr);

return friendlyErrMsg.toString();
}
}

统一日志处理实现类：

package com.pilelot.web.util;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.apache.log4j.Logger;

/**
 * Spring 统一日志处理实现类
 * @author Andy Chan
 *
 */
public class LogInterceptor implements MethodInterceptor
{

public Object invoke(MethodInvocation invocation) throws Throwable
{
Logger loger = Logger.getLogger(invocation.getClass());

loger.info("--Log By Andy Chan -----------------------------------------------------------------------------");
loger.info(invocation.getMethod() + ":BEGIN!--(Andy ChanLOG)");// 方法前的操作
Object obj = invocation.proceed();// 执行需要Log的方法
loger.info(invocation.getMethod() + ":END!--(Andy ChanLOG)");// 方法后的操作
loger.info("-------------------------------------------------------------------------------------------------");

return obj;
}

}

Spring配置文件添加：

<!-- Spring 统一日志处理   LogInterceptor拦截器 配置　-->
<bean id="logLnterceptor" class="com.pilelot.web.util.LogInterceptor"/>
<!-- Spring 统一异常处理  ExceptionAdvisor配置 -->
<bean id="exceptionHandler" class="com.pilelot.web.util.ExceptionAdvisor"></bean>

<!-- Bean自动代理处理器 配置-->
<bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator" >
<property name="beanNames">
<list>    <!-- 配置需要进行日志记录的Service和Dao -->
<value>commonDao</value>
<!-- 配置所有Service结尾命名的Bean，即所有Service层的类都要经过exceptionHandler异常处理类 -->
<value>*Service</value>  <!-- Service层的Bean ID 命名要以Service结尾 -->
</list>
</property>
<property name="interceptorNames">
<list>
<value>exceptionHandler</value>
<value>logLnterceptor</value>
<!--<value>transactionInterceptor</value>-->
</list>
</property>
</bean>
lt;!-- ——————————————————Spring 统一日志处理 + 统一异常处理  配置结束—————————————悲伤的分隔线—————————— -->

这样简单三步，就实现了由Spring统一日志+统一异常管理，代码清爽了不少！