昨天我们讲到了Mina的基本知识点。如果还有不懂得同学可以看一下我昨天的博客。http://www.cnblogs.com/getherBlog/p/3934927.html今天我着重来讲一下基于Mina的客户端的开发（代码均在最后链接地址中，欢迎下载）。
客户端代码我是在Eclipse下写的。
这里我展示几个比较重要的类来详细说明一下：
package com.example.mina.server; import java.net.InetSocketAddress; import org.apache.mina.core.filterchain.DefaultIoFilterChainBuilder; import org.apache.mina.core.future.CloseFuture; import org.apache.mina.core.future.ConnectFuture; import org.apache.mina.core.session.IoSession; import org.apache.mina.filter.codec.ProtocolCodecFilter; import org.apache.mina.filter.logging.LoggingFilter; import org.apache.mina.filter.ssl.SslFilter; import org.apache.mina.transport.socket.SocketConnector; import org.apache.mina.transport.socket.nio.NioSocketConnector; import com.example.mina.charset.CharsetFactory; import com.example.mina.hanlder.MsgHanler; import com.example.mina.ssl.SSLContextGenerator; /** * <pre> * Project Name:MinaClient * Package:com.example.mina.server * FileName:MinaClient.java * Purpose:客户端 * Create Time: 2014-8-19 下午4:36:55 * Create Specification: * Modified Time: * Modified by: * Modified Specification: * Version: 1.0 * </pre> * * @author myp */ public class MinaClient { private SocketConnector connector; private ConnectFuture future; private IoSession session; public boolean connect() { /* * 1.创建一个socket连接,连接到服务器 */ connector = new NioSocketConnector(); /* * 获取过滤器链,用于添加过滤器 */ DefaultIoFilterChainBuilder chain = connector.getFilterChain(); /* * 2.为连接添加过滤器，SSL、日志、编码过滤器 */ // SSLContextGenerator是我们自己写的一个SSL上下文产生器,稍后会讲到 SslFilter sslFilter = new SslFilter( new SSLContextGenerator().getSslContext()); // 设置为客户端模式 sslFilter.setUseClientMode(true); // a.ssl过滤器，这个一定要第一个添加，否则数据不会进行加密 chain.addFirst("sslFilter", sslFilter); // b.添加日志过滤器 chain.addLast("logger", new LoggingFilter()); // c.添加字符的编码过滤器 chain.addLast("codec", new ProtocolCodecFilter(new CharsetFactory())); /* * 3.设置消息处理器，用于处理接收到的消息 */ connector.setHandler(new MsgHanler()); /* * 4.根据IP和端口号连接到服务器 */ future = connector.connect(new InetSocketAddress("192.168.1.12", 3456)); // 等待连接创建完成 future.awaitUninterruptibly(); /* * 5.获取session对象,通过session可以向服务器发送消息； */ session = future.getSession(); session.getConfig().setUseReadOperation(true); return future.isConnected(); } /** * 往服务器发送消息 * * @param message */ public void sendMsg2Server(String message) { session.write(message); } /** * 关闭与服务器的连接 * * @return */ public boolean close() { CloseFuture future = session.getCloseFuture(); future.awaitUninterruptibly(1000); connector.dispose(); return true; } }View Code
MinaClient就是按照第二步当中的流程走过来的；所以编程的时候最主要的是整体的思路，思路明白了那么编程就会变得异常效率。
package com.example.mina.ssl; import java.io.File; import java.security.KeyStore; import javax.net.ssl.SSLContext; import org.apache.mina.filter.ssl.KeyStoreFactory; import org.apache.mina.filter.ssl.SslContextFactory; /** * <pre> * Project Name:SSLContextGenerator * Package:com.example.mina.ssl * FileName:SSLContextGenerator.java * Purpose:客户端 * Create Time: 2014-8-19 下午4:41:55 * Create Specification: * Modified Time: * Modified by: * Modified Specification: * Version: 1.0 * </pre> * * @author myp */ public class SSLContextGenerator { /** * 这个方法，通过keystore和truststore文件返回一个SSLContext对象 * * @return */ public SSLContext getSslContext() { SSLContext sslContext = null; try { /* * 提供keystore的存放目录，读取keystore的文件内容 */ File keyStoreFile = new File("C:/Users/Administrator/keystore.jks"); /* * 提供truststore的存放目录，读取truststore的文件内容 */ File trustStoreFile = new File( "C:/Users/Administrator/truststore.jks"); if (keyStoreFile.exists() && trustStoreFile.exists()) { final KeyStoreFactory keyStoreFactory = new KeyStoreFactory(); System.out.println("Url is: " + keyStoreFile.getAbsolutePath()); keyStoreFactory.setDataFile(keyStoreFile); /* * 这个是当初我们使用keytool创建keystore和truststore文件的密码,也是上次让你们一定要记住密码的原因了 */ keyStoreFactory.setPassword("134426myp"); final KeyStoreFactory trustStoreFactory = new KeyStoreFactory(); trustStoreFactory.setDataFile(trustStoreFile); trustStoreFactory.setPassword("134426myp"); final SslContextFactory sslContextFactory = new SslContextFactory(); final KeyStore keyStore = keyStoreFactory.newInstance(); sslContextFactory.setKeyManagerFactoryKeyStore(keyStore); final KeyStore trustStore = trustStoreFactory.newInstance(); sslContextFactory.setTrustManagerFactoryKeyStore(trustStore); sslContextFactory .setKeyManagerFactoryKeyStorePassword("134426myp"); sslContext = sslContextFactory.newInstance(); System.out.println("SSL provider is: " + sslContext.getProvider()); } else { System.out .println("Keystore or Truststore file does not exist"); } } catch (Exception ex) { ex.printStackTrace(); } return sslContext; } }View Code
如果不知道如何创建keystore和truststore文件的话，请查看我的这篇博客：http://www.cnblogs.com/getherBlog/p/3930317.html
package com.example.mina.hanlder; import org.apache.mina.core.service.IoHandlerAdapter; import org.apache.mina.core.session.IoSession; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * <pre> * Project Name:MsgHanler * Package:com.example.mina.handler * FileName:MsgHanler.java * Purpose:I/O消息处理器,从这里我们就可以看出Mina是事件驱动的 * Create Time: 2014-8-19 下午4:39:55 * Create Specification: * Modified Time: * Modified by: * Modified Specification: * Version: 1.0 * </pre> * * @author myp */ public class MsgHanler extends IoHandlerAdapter { private static final Logger log = LoggerFactory.getLogger(MsgHanler.class); @Override public void exceptionCaught(IoSession session, Throwable cause) throws Exception { // 出现异常 log.error("--------exception--------"); super.exceptionCaught(session, cause); } @Override public void messageReceived(IoSession session, Object message) throws Exception { // 从服务器中接收到消息后的处理 log.info("--------msg receive--------"); log.info("Message:{}" + message.toString()); super.messageReceived(session, message); } @Override public void messageSent(IoSession session, Object message) throws Exception { // 往服务器中发送消息 log.info("--------msg sent--------"); super.messageSent(session, message); } @Override public void sessionCreated(IoSession session) throws Exception { // 当session被创建的时候调用 log.info("--------session create--------"); super.sessionCreated(session); } }View Code
基本上我们最主要的就是对在I/O处理器这里对收到的消息进行处理，也是编程的核心所在！
log4j.rootCategory=INFO, stdout , R log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=[QC] %p [%t] %C.%M(%L) | %m%n log4j.appender.R=org.apache.log4j.DailyRollingFileAppender log4j.appender.R.File=D:\\Mina\\logs\\client.log log4j.appender.R.layout=org.apache.log4j.PatternLayout 1log4j.appender.R.layout.ConversionPattern=%d-[TS] %p %t %c - %m%n log4j.logger.com.neusoft=DEBUG log4j.logger.com.opensymphony.oscache=ERROR log4j.logger.net.sf.navigator=ERROR log4j.logger.org.apache.commons=ERROR log4j.logger.org.apache.struts=WARN log4j.logger.org.displaytag=ERROR log4j.logger.org.springframework=DEBUG log4j.logger.com.ibatis.db=WARN log4j.logger.org.apache.velocity=FATAL log4j.logger.com.canoo.webtest=WARN log4j.logger.org.hibernate.ps.PreparedStatementCache=WARN log4j.logger.org.hibernate=DEBUG log4j.logger.org.logicalcobwebs=WARN log4j.rootCategory=INFO, stdout , R log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=[QC] %p [%t] %C.%M(%L) | %m%n log4j.appender.R=org.apache.log4j.DailyRollingFileAppender log4j.appender.R.File=D:\\Tomcat 5.5\\logs\\qc.log log4j.appender.R.layout=org.apache.log4j.PatternLayout 1log4j.appender.R.layout.ConversionPattern=%d-[TS] %p %t %c - %m%n log4j.logger.com.neusoft=DEBUG log4j.logger.com.opensymphony.oscache=ERROR log4j.logger.net.sf.navigator=ERROR log4j.logger.org.apache.commons=ERROR log4j.logger.org.apache.struts=WARN log4j.logger.org.displaytag=ERROR log4j.logger.org.springframework=DEBUG log4j.logger.com.ibatis.db=WARN log4j.logger.org.apache.velocity=FATAL log4j.logger.com.canoo.webtest=WARN log4j.logger.org.hibernate.ps.PreparedStatementCache=WARN log4j.logger.org.hibernate=DEBUG log4j.logger.org.logicalcobwebs=WARNView Code
我们可以再这里设置我们的日志输出目录：log4j.appender.R.File=D:\\Mina\\logs\\client.log
3. SSL加密中，如果不知道如何使用keystore生成keystore和truststore文件，可以查看这篇博客：http://www.cnblogs.com/getherBlog/p/3930317.html
4. 在添加过滤器的时候，处理的顺序是按照添加过滤器的顺序；
5. Mina在使用过滤器的时候，只要在需要的地方添加就可以了，不一定是服务器、客户端都要添加的。就是说，服务器、客户端编程的时候服务器有这个过滤器，客户端可以有也可以没有。
点我下载
下载后导入到Eclipse当中，将com.example.mina.server包下面的MinaClient类中的下面代码注释掉，然后就可以正常运行了！原因是你本地不存在keystore和truststore文件，如果需要生成请看注意事项中第三条。
SslFilter sslFilter = new SslFilter( new SSLContextGenerator().getSslContext()); sslFilter.setUseClientMode(true); chain.addFirst("sslFilter", sslFilter);
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