mina与spring集成（翻译）

源地址：http://mina.apache.org/mina-project/userguide/ch17-spring-integration/ch17-spring-integration.html

一个mina应用主要包括一下方面：

• One Handler
• Two Filter - Logging Filter and a ProtocolCodec Filter
• NioDatagram Socket

一个mina 服务端的实例程序如下：

public void initialize() throws IOException {

    // Create an Acceptor
    NioDatagramAcceptor acceptor = new NioDatagramAcceptor();

    // Add Handler
    acceptor.setHandler(new ServerHandler());

    acceptor.getFilterChain().addLast("logging",
                new LoggingFilter());
    acceptor.getFilterChain().addLast("codec",
                new ProtocolCodecFilter(new SNMPCodecFactory()));

    // Create Session Configuration
    DatagramSessionConfig dcfg = acceptor.getSessionConfig();
        dcfg.setReuseAddress(true);
        logger.debug("Starting Server......");
        // Bind and be ready to listen
        acceptor.bind(new InetSocketAddress(DEFAULT_PORT));
        logger.debug("Server listening on "+DEFAULT_PORT);
}

继承过程如下：

1.设置IO handler。在spring context文件中设置IO handler。

<!-- The IoHandler implementation -->
<bean id="trapHandler" class="com.ashishpaliwal.udp.mina.server.ServerHandler">

2.创建过滤器链。

<bean id="snmpCodecFilter" class="org.apache.mina.filter.codec.ProtocolCodecFilter">
  <constructor-arg>
    <bean class="com.ashishpaliwal.udp.mina.snmp.SNMPCodecFactory" />
  </constructor-arg>
</bean>

<bean id="loggingFilter" class="org.apache.mina.filter.logging.LoggingFilter" />

<!-- The filter chain. -->
<bean id="filterChainBuilder" class="org.apache.mina.core.filterchain.DefaultIoFilterChainBuilder">
  <property name="filters">
    <map>
      <entry key="loggingFilter" value-ref="loggingFilter"/>
      <entry key="codecFilter" value-ref="snmpCodecFilter"/>
    </map>
  </property>
</bean>

3.创建socket并设置socket参数

<bean class="org.springframework.beans.factory.config.CustomEditorConfigurer">
    <property name="customEditors">
      <map>
        <entry key="java.net.SocketAddress">
          <bean class="org.apache.mina.integration.beans.InetSocketAddressEditor" />
        </entry>
      </map>
    </property>
</bean>

<!-- The IoAcceptor which binds to port 161 -->
<bean id="ioAcceptor" class="org.apache.mina.transport.socket.nio.NioDatagramAcceptor" init-method="bind" destroy-method="unbind">
  <property name="defaultLocalAddress" value=":161" />
  <property name="handler" ref="trapHandler" />
  <property name="filterChainBuilder" ref="filterChainBuilder" />
</bean>

测试程序

public void initializeViaSpring() throws Exception {
    new ClassPathXmlApplicationContext("trapReceiverContext.xml");
}