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>