Apachemina的日志配置

用Log4J 1.2.x的框架时，我们需要三个jar包：log4j-1.2.3.jar  slf4j-api-1.6.2jar  slf4j-log4j12-1.6.2jar 从名字上可以看出第三个是主要的jar包，提供了前两者的增强功能。

下面我们以一个例子来说明日志过滤器的配置方法：

首先我们创建一个log4j的配置文件并设置日志输出级别为debug：

log4j.appender.MINA=org.apache.log4j.ConsoleAppender
log4j.appender.MINA.layout=org.apache.log4j.PatternLayout
log4j.appender.MINA.layout.COnversionPattern=%d{yyyy-MM-dd HH:mm:ss}  %m%n
#to console#
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.COnversionPattern=%d{yyyy-MM-dd HH:mm:ss}  %m%n
#to file#
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=./log/minademos.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.COnversionPattern=%d{yyyy-MM-dd HH:mm:ss}  %l  %m%n
#error/warn/info/debug#
log4j.rootLogger=debug, stdout,MINA,file

接下来我们写一个服务器端的代码，在8080端口启动一个服务：

package com.yushh.test.logging;
import java.io.IOException;
import java.net.InetSocketAddress;
import org.apache.mina.core.filterchain.DefaultIoFilterChainBuilder;
import org.apache.mina.core.service.IoAcceptor;
import org.apache.mina.filter.logging.LogLevel;
import org.apache.mina.filter.logging.LoggingFilter;
import org.apache.mina.transport.socket.nio.NioSocketAcceptor;
public class EchoServer {
        private static final int PORT = 8080;
        public static void main(String[] args) throws IOException {
                 IoAcceptor acceptor = new NioSocketAcceptor();
                DefaultIoFilterChainBuilder chain = acceptor.getFilterChain();
                LoggingFilter loggingFilter = new LoggingFilter();
                chain.addLast("logging", loggingFilter);
                acceptor.setDefaultLocalAddress(new InetSocketAddress(PORT));
                acceptor.setHandler(new EchoProtocolHandler());
                acceptor.bind();
                System.out.println("Listening on port " + PORT);
        }
}

注意此处没有具体配置loggingFilter，下面我们用dos telnet本机的8080端口得到如下的日志信息：

Listening on port 8080
2012-03-15 14:34:56  CREATED
2012-03-15 14:34:56  CREATED
2012-03-15 14:34:56  OPENED
2012-03-15 14:34:56  OPENED
2012-03-15 14:34:58  RECEIVED: HeapBuffer[pos=0 lim=1 cap=2048: 61]
2012-03-15 14:34:58  RECEIVED: HeapBuffer[pos=0 lim=1 cap=2048: 61]
2012-03-15 14:35:00  RECEIVED: HeapBuffer[pos=0 lim=1 cap=2048: 62]
2012-03-15 14:35:00  RECEIVED: HeapBuffer[pos=0 lim=1 cap=2048: 62]
2012-03-15 14:35:01  RECEIVED: HeapBuffer[pos=0 lim=1 cap=1024: 63]
2012-03-15 14:35:01  RECEIVED: HeapBuffer[pos=0 lim=1 cap=1024: 63]
2012-03-15 14:35:02  RECEIVED: HeapBuffer[pos=0 lim=1 cap=1024: 41]
2012-03-15 14:35:02  RECEIVED: HeapBuffer[pos=0 lim=1 cap=1024: 41]
2012-03-15 14:35:05  CLOSED
2012-03-15 14:35:05  CLOSED

可见session的几种生命周期都被答应出来，从输出的RECEIVED信息中可以看见我在客户端输入的字符为‘abcA’，呵呵这个以后再讨论。

下面我们修改一下服务器代码：

package com.yushh.test.logging;
import java.io.IOException;
import java.net.InetSocketAddress;
import org.apache.mina.core.filterchain.DefaultIoFilterChainBuilder;
import org.apache.mina.core.service.IoAcceptor;
import org.apache.mina.filter.logging.LogLevel;
import org.apache.mina.filter.logging.LoggingFilter;
import org.apache.mina.transport.socket.nio.NioSocketAcceptor;
public class EchoServer {
        private static final int PORT = 8080;
        public static void main(String[] args) throws IOException {
                 IoAcceptor acceptor = new NioSocketAcceptor();
                DefaultIoFilterChainBuilder chain = acceptor.getFilterChain();
                LoggingFilter loggingFilter = new LoggingFilter();
                loggingFilter.setSessionClosedLogLevel(LogLevel.NONE);
                loggingFilter.setSessionCreatedLogLevel(LogLevel.DEBUG);
                loggingFilter.setSessionOpenedLogLevel(LogLevel.INFO);
                chain.addLast("logging", loggingFilter);
                acceptor.setDefaultLocalAddress(new InetSocketAddress(PORT));
                acceptor.setHandler(new EchoProtocolHandler());
                acceptor.bind();
                System.out.println("Listening on port " + PORT);
        }
}

我们在LoggingFilter 增加了日志输出级别，设置当session关闭时不打印任何日志，当session建立时日志为debug级别，当session打开的时候日志为info级别，同样的客户端测试结果如下：

Listening on port 8080
2012-03-15 14:38:03  CREATED
2012-03-15 14:38:03  CREATED
2012-03-15 14:38:03  OPENED
2012-03-15 14:38:03  OPENED
2012-03-15 14:38:05  RECEIVED: HeapBuffer[pos=0 lim=1 cap=2048: 61]
2012-03-15 14:38:05  RECEIVED: HeapBuffer[pos=0 lim=1 cap=2048: 61]
2012-03-15 14:38:05  RECEIVED: HeapBuffer[pos=0 lim=1 cap=2048: 62]
2012-03-15 14:38:05  RECEIVED: HeapBuffer[pos=0 lim=1 cap=2048: 62]
2012-03-15 14:38:08  RECEIVED: HeapBuffer[pos=0 lim=1 cap=1024: 63]
2012-03-15 14:38:08  RECEIVED: HeapBuffer[pos=0 lim=1 cap=1024: 63]
2012-03-15 14:38:09  RECEIVED: HeapBuffer[pos=0 lim=1 cap=1024: 41]
2012-03-15 14:38:09  RECEIVED: HeapBuffer[pos=0 lim=1 cap=1024: 41]

可见mina优先使用代码中的 日志输出级别。