Mina入门教程（二）----Spring4 集成Mina

在spring和mina集成的时候，要十分注意一个问题：版本。

这是一个非常严重的问题，mina官网的demo没错，网上很多网友总结的代码也是对的，但是很多人将mina集成到spring中的时候，总是会发现有个问题：

java.lang.IllegalArgumentException: Cannot convert value of type [org.apache.mina.integration.beans.InetSocketAddressEditor] to required
type [java.lang.Class] for property 'customEditors[java.net.SocketAddress]': PropertyEditor .....

类型不匹配。估计很多人按照网上的demo来做的话，都会遇到这个错误（除非spring是用的2.5或者之前的版本）。这是因为新版的spring有改动：

将一个PropertyEditor 实例传入CustomEditorConfigurer 已经被废除了

所以很多人会遇到这个错误。笔者也是查了N久资料，发现某位学php的牛人解决了该问题。是对spring的配置文件做一点修改：
将原来的：

<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>

改成：

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

这样，这个问题就解决了。想想原本的项目中，用的spring+mina没出现问题，真是个侥幸。。。

好了，下面把整合的写一下。

首先是用到的包，这里使用maven，pom.xml:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>mymina</groupId>
<artifactId>MyMina</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>MyMina</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<extensions>true</extensions>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-jdk14</artifactId>
<version>1.7.7</version>
</dependency>
<dependency>
<groupId>org.apache.mina</groupId>
<artifactId>mina-integration-beans</artifactId>
<version>2.0.7</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>4.0.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.apache.mina</groupId>
<artifactId>mina-core</artifactId>
<version>2.0.4</version>
<type>bundle</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.apache.mina</groupId>
<artifactId>mina-integration-spring</artifactId>
<version>1.1.7</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.0.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.3.0</version>
</dependency>
</dependencies>
</project>

这里面有几个配置是比较讲究的，包括那个plugin和mina-core中的配置，配置有点差别，会报一个bundle的错误。
因为用maven，会方便很多，找包的时候，知道依赖就可以了。这里有个网站，可以查找自己需要的依赖包：http://mvnrepository.com/ ，这个网站很不错，类似以前的findjar.com。

然后是spring整合的配置：

<?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-2.0.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" >
</entry>
</map>
</property>
</bean>
<bean id="ioAcceptor"
class="org.apache.mina.transport.socket.nio.NioSocketAcceptor"
init-method="bind" destroy-method="unbind">
<property name="defaultLocalAddress" value=":8888" />
<property name="handler" ref="SampleHandler" />
<property name="filterChainBuilder" ref="filterChainBuilder" />
<property name="reuseAddress" value="true" />
</bean>
<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>
<!--
<bean
class="org.apache.mina.filter.codec.textline.TextLineCodecFactory" />
-->
<bean class="cn.org.handler.MyCodeFactory"></bean>
</constructor-arg>
</bean>
<bean id="loggingFilter"
class="org.apache.mina.filter.logging.LoggingFilter" />
<bean id="SampleHandler" class="cn.org.handler.HandlerTwo" />
<!--boss server
-->
<bean id="bossSampleHandler" class="cn.org.handler.HandlerOne" />
<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>
</beans>

这里需要注意的问题，前面已经有写。
再者就是服务端和客户端的代码编写，服务端已经和spring整合了，里面配置了服务端的handler，所以这里主要是服务端的handler：

package cn.org.handler;
import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IdleStatus;
import org.apache.mina.core.session.IoSession;
public class HandlerTwo extends IoHandlerAdapter {
@Override
public void messageReceived(IoSession session, Object message)
throws Exception {
// TODO Auto-generated method stub
//
super.messageReceived(session, message);
System.out.println("received message :"+message);
}
@Override
public void sessionClosed(IoSession session) throws Exception {
// TODO Auto-generated method stub
super.sessionClosed(session);
}
@Override
public void sessionIdle(IoSession session, IdleStatus status)
throws Exception {
// TODO Auto-generated method stub
super.sessionIdle(session, status);
}
}

写一个启动入口：

package cn.org.test;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
ClassPathXmlApplicationContext ct =
new ClassPathXmlApplicationContext("applicationContext-mina.xml");
}
}

还缺少一个服务端的编码过滤器：

package cn.org.handler;
import java.nio.charset.Charset;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.filter.codec.ProtocolCodecFactory;
import org.apache.mina.filter.codec.ProtocolDecoder;
import org.apache.mina.filter.codec.ProtocolEncoder;
import org.apache.mina.filter.codec.textline.LineDelimiter;
import org.apache.mina.filter.codec.textline.TextLineDecoder;
import org.apache.mina.filter.codec.textline.TextLineEncoder;
public
class MyCodeFactory implements ProtocolCodecFactory {
private final TextLineEncoder encoder;
private final TextLineDecoder decoder;
/*final static char endchar = 0x1a;*/
final static char endchar = 0x0d;
public MyCodeFactory() {
this(Charset.forName("gb2312"));
}
public MyCodeFactory(Charset charset) {
encoder = new TextLineEncoder(charset, LineDelimiter.UNIX);
decoder = new TextLineDecoder(charset, LineDelimiter.AUTO);
}
public ProtocolDecoder getDecoder(IoSession session) throws Exception {
// TODO Auto-generated method stub
return decoder;
}
public ProtocolEncoder getEncoder(IoSession session) throws Exception {
// TODO Auto-generated method stub
return encoder;
}
public int getEncoderMaxLineLength() {
return encoder.getMaxLineLength();
}
public void setEncoderMaxLineLength(int maxLineLength) {
encoder.setMaxLineLength(maxLineLength);
}
public int getDecoderMaxLineLength() {
return decoder.getMaxLineLength();
}
public void setDecoderMaxLineLength(int maxLineLength) {
decoder.setMaxLineLength(maxLineLength);
}
}

这样，运行入口程序，服务端就启动了。除了入口，在spring中都有配置，包括端口这些。

然后写一个客户端：

客户端的handler：

package cn.org.handler;
import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IdleStatus;
import org.apache.mina.core.session.IoSession;
public class HandlerOne extends IoHandlerAdapter {
@Override
public void messageReceived(IoSession session, Object message)
throws Exception {
// TODO Auto-generated method stub
//super.messageReceived(session, message);
System.out.println("message :"+message);
}
@Override
public void sessionClosed(IoSession session) throws Exception {
// TODO Auto-generated method stub
super.sessionClosed(session);
}
@Override
public void sessionIdle(IoSession session, IdleStatus status)
throws Exception {
// TODO Auto-generated method stub
super.sessionIdle(session, status);
}
@Override
public void messageSent(IoSession session, Object message) throws Exception {
System.out.println("发送的消息是："+message.toString());
//super.messageSent(session, message);

}
@Override
public void sessionCreated(IoSession session) throws Exception {
super.sessionCreated(session);
}
@Override
public void sessionOpened(IoSession session) throws Exception {
super.sessionOpened(session);
}
}

客户端的入口:

package cn.org.test;
import java.net.InetSocketAddress;
import java.nio.charset.Charset;
import org.apache.mina.core.future.ConnectFuture;
import org.apache.mina.filter.codec.ProtocolCodecFilter;
import org.apache.mina.filter.codec.textline.TextLineCodecFactory;
import org.apache.mina.filter.logging.LoggingFilter;
import org.apache.mina.transport.socket.nio.NioSocketConnector;
import cn.org.handler.HandlerOne;
public class ClintTest {
/**
* @param args
*/
public static void main(String[] args) {
// 创建客户端连接器. 
NioSocketConnector connector = new NioSocketConnector();
connector.getFilterChain().addLast( "logger", new LoggingFilter() );
connector.getFilterChain().addLast( "codec", new ProtocolCodecFilter( new TextLineCodecFactory( Charset.forName( "GBK" )))); //设置编码过滤器 
connector.setHandler(new HandlerOne());//设置事件处理器 
ConnectFuture cf = connector.connect(
new InetSocketAddress("127.0.0.1", 8888));//建立连接 
cf.awaitUninterruptibly();//等待连接创建完成 
cf.getSession().write("知识");//发送消息 
cf.getSession().close(true);
cf.getSession().getCloseFuture().awaitUninterruptibly();//等待连接断开 

connector.dispose();
}
}

这样，当服务端启动的时候，客户端发送一个信息，服务端就会收到，并作相应的处理。
运行结果

客户端控制台输出：

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/Users/wanglei/.m2/repository/org/slf4j/slf4j-jdk14/1.7.7/slf4j-jdk14-1.7.7.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/Users/wanglei/.m2/repository/org/slf4j/slf4j-log4j12/1.3.0/slf4j-log4j12-1.3.0.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.JDK14LoggerFactory]
八月 27, 2014 8:50:10 下午 org.apache.mina.filter.logging.LoggingFilter log
信息: CREATED
八月 27, 2014 8:50:10 下午 org.apache.mina.filter.logging.LoggingFilter log
信息: OPENED
八月 27, 2014 8:50:10 下午 org.apache.mina.filter.logging.LoggingFilter log
信息: SENT: HeapBuffer[pos=0 lim=0 cap=0: empty]
发送的消息是：知识
八月 27, 2014 8:50:10 下午 org.apache.mina.filter.logging.LoggingFilter log
信息: CLOSED

服务端输出：

SLF4J: Found binding in [jar:file:/C:/Users/wanglei/.m2/repository/org/slf4j/slf4j-log4j12/1.3.0/slf4j-log4j12-1.3.0.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.JDK14LoggerFactory]
八月 27, 2014 8:50:10 下午 org.apache.mina.filter.logging.LoggingFilter log
信息: CREATED
八月 27, 2014 8:50:10 下午 org.apache.mina.filter.logging.LoggingFilter log
信息: OPENED
八月 27, 2014 8:50:10 下午 org.apache.mina.filter.logging.LoggingFilter log
信息: RECEIVED: 知识
received message :知识
八月 27, 2014 8:50:10 下午 org.apache.mina.filter.logging.LoggingFilter log
信息: CLOSED