Spring+Mina（六）

pom.xml引入相应的包

<!-- apache mina -->
<dependency>
<groupId>org.apache.mina</groupId>
<artifactId>mina-core</artifactId>
<version>${mina.version}</version>
</dependency>
<dependency>
<groupId>org.apache.mina</groupId>
<artifactId>mina-integration-beans</artifactId>
<version>${mina.version}</version>
</dependency>
<dependency>
<groupId>org.apache.mina</groupId>
<artifactId>mina-integration-spring</artifactId>
<version>1.1.7</version>
</dependency>
MINA的配置文件spring-mina.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> 
<bean class="org.springframework.beans.factory.config.CustomEditorConfigurer">
<property name="customEditors">
<map>
<entry key="java.net.SocketAddress" value="org.apache.mina.integration.beans.InetSocketAddressEditor" />
</map>
</property>
</bean>

<!-- the IoFilters -->
<bean id="executorFilter" class="org.apache.mina.filter.executor.ExecutorFilter" />

<bean id="mdcInjectionFilter" class="org.apache.mina.filter.logging.MdcInjectionFilter">
<constructor-arg value="remoteAddress" />
</bean>

<bean id="codecFilter" class="org.apache.mina.filter.codec.ProtocolCodecFilter">
<constructor-arg>
<ref bean="messageCodecFactory" />
</constructor-arg>
</bean>

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

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

<!-- The IoAcceptor -->
<bean id="tcpAcceptor" class="org.apache.mina.transport.socket.nio.NioSocketAcceptor"
lazy-init="false" init-method="bind" destroy-method="unbind">
<property name="defaultLocalAddress" value="${socket.tcp.port}" />
<property name="handler" ref="tcpHandler" />
<property name="reuseAddress" value="true" />
<property name="filterChainBuilder" ref="filterChainBuilder" />
</bean>

<bean id="udpAcceptor" class="org.apache.mina.transport.socket.nio.NioDatagramAcceptor"
lazy-init="false" init-method="bind" destroy-method="unbind">
<property name="defaultLocalAddress" value="${socket.udp.port}" />
<property name="handler" ref="udpHandler" />
<property name="filterChainBuilder" ref="filterChainBuilder" />
</bean>
</beans>

需要注意的是tcp的监听reuserAddress要设置成true，否则可能重启后，端口显示占用。

MessageCodecFactory负责处理发送和接收的ip包，包含解码和编码两部分。

MessageCodecFactory.java

@Component("messageCodecFactory")
public class MessageCodecFactory implements ProtocolCodecFactory {
private f
4000
inal MessageEncoder encoder;
private final MessageDecoder decoder;

public MessageCodecFactory() {
encoder = new MessageEncoder();
decoder = new MessageDecoder();
}

@Override
public ProtocolEncoder getEncoder(IoSession session) throws Exception {
return encoder;
}

@Override
public ProtocolDecoder getDecoder(IoSession session) throws Exception {
return decoder;
}
}
MessageDecoder.java 处理解码，粘包 拆包都在这里面进行。我们简单处理，直接把收到的信息转成字符串。
protected boolean doDecode(IoSession session, IoBuffer in, ProtocolDecoderOutput out) throws Exception {
in.order(ByteOrder.LITTLE_ENDIAN);
int length = in.limit();
byte[] bytes = new byte[length];
in.get(bytes);
String data = new String(bytes, "GBK");
out.write(data);
return true;
}
TcpHandler是具体负责处理消息解析的逻辑块，当发送消息后，messageReceived会响应。
@Service("tcpHandler")
public class TcpHandler extends IoHandlerAdapter {

@Override
public void sessionCreated(IoSession session) throws Exception {
//获取请求ip ((InetSocketAddress)session.getRemoteAddress()).getAddress().getHostAddress();
}

@Override
public void sessionOpened(IoSession session) throws Exception {
// Empty handler
}

@Override
public void sessionClosed(IoSession session) throws Exception {
// Empty handler
}

@Override
public void sessionIdle(IoSession session, IdleStatus status) throws Exception {
session.closeOnFlush();

String errorMsg = status.equals(IdleStatus.READER_IDLE) ? "Read idle timeout" : "Write idle timeout";
logger.debug(errorMsg + ", connection closed!");
}

@Override
public void exceptionCaught(IoSession session, Throwable cause) throws Exception {
super.exceptionCaught(session, cause);
session.closeOnFlush();
}

@Override
public void messageReceived(IoSession session, Object message) throws Exception {
final String msg = ((String) message).trim();
if(msg.length() <= 500) {
logger.debug("Receive TCP << " + msg);
}
else {
logger.debug("Receive TCP << " + msg.substring(0, 500) + "...");
}
//具体的处理逻辑放在这
if(out == null) {
session.closeNow(); //关闭连接
}
else {
session.write(out);
logger.debug("Send TCP >> " + out);
}
}
}