jmc监控工具

java7以上的版本，jdk的bin目录下自带jmc工具，可以用来监控java应用的性能，貌似比jvisualvm全面一些

用法是先在java服务启动的地方加入jmxServer代码，绑定端口，建立起jmx服务

</pre><pre name="code" class="java">jmxServer = new JmxServer(config.getProperty(RmiServer.RMI_SERVER_HOST), 10713);
jmxServer.start();
SessionFactory sf = context.getBean(SessionFactory.class);
jmxServer.addProvider(new EhcacheMonitor(sf, "gameserver", false, true));

public class JmxServer {

private static final Logger logger = LoggerFactory.getLogger(JmxServer.class);
private MBeanServer mbServer;
private String hostName;
private int port;
private JMXConnectorServer connectorServer;

public JmxServer(String hostName, int port) {
this.hostName = hostName;
this.port = port;
this.mbServer = ManagementFactory.getPlatformMBeanServer();
}

public void start() {
System.setProperty("java.rmi.server.hostname", hostName);

Properties properties = new Properties();
properties.put(ConnectorBootstrap.PropertyNames.USE_AUTHENTICATION, "true");
properties.put(ConnectorBootstrap.PropertyNames.USE_SSL, "false");
connectorServer = ConnectorBootstrap.initialize(String.valueOf(port), properties);

logger.info("Start the JMX server on {}:{}", hostName, port);
}

public void stop() {
try {
if (this.connectorServer != null) {
this.connectorServer.stop();
}
} catch (Exception e) {
logger.error("", e);
}
}

public void addProvider(MBeanProvider provider) throws Exception {
provider.register(this.mbServer);
}
}

服务建立起来以后，需要在java的\jre7\lib\management的目录下加入jmxremote.password,jmxremote.access身份验证文件，win操作系统下需要修改这两个文件的访问权限，修改方法，选择文件右键，安全，权限

jmxremote.password这个里面可以设置用户的访问名称，和密码，在最后面加入

# monitorRole  QED
# controlRole   R&D
monitorRole 123456
controlRole 123456

jmxremote.access这个里面可以设置用户的访问权限，在最后面加入

# o The "monitorRole" role has readonly access.
# o The "controlRole" role has readwrite access and can create the standard
#   Timer and Monitor MBeans defined by the JMX API.
monitorRole   readonly
controlRole   readwrite \
create javax.management.monitor.*,javax.management.timer.*,com.sun.management.*,com.oracle.jrockit.*  \
unregister

这两个文件改好放对位置后，java服务启动时加入如下参数，

-XX:MaxDirectMemorySize=1024m -XX:+UnlockCommercialFeatures -XX:+FlightRecorder -XX:FlightRecorderOptions=defaultrecording=true

这样，jmx服务就算搭建完成了，后面的就是使用jmc客户端去连接这个服务，监控性能，连接的时候身份验证就是之前那个jmxremote.password文件里配的用户名和密码

连上去之后可以看到JMC工具的强大，特别是飞行记录仪，蛮好用的