二、JMX自定义MBean

一、自定义MBean

public interface HelloMBean {

String getName();
void setName(String name);

String print();
}

HelloMBean必须以MBean结尾。

@Slf4j
public class Hello implements HelloMBean {

private String name;
@Override
public String getName() {
return name;
}

@Override
public void setName(String name) {
this.name = name;
}

@Override
public String print() {
log.info(name);
return name;
}
}

@Slf4j是lombok注解。HelloMBean的名称去除MBean后必须是Hello,不能是其他名称。这里的资源是Hello,MBean的接口是必须是HelloMBean。

在启动类注册MBean：

@SpringBootApplication
@MapperScan("com.example.mytest.mapper")
public class MyTestApplication {

public static void main(String[] args) {
SpringApplication.run(MyTestApplication.class, args);

MBeanServer platformMBeanServer = ManagementFactory.getPlatformMBeanServer();

Hello hello = new Hello();
hello.setName("张三");
try {
// ObjectName规范是包名:type=接口名,name=MBean名
ObjectName objectName = new ObjectName("com.example.mytest.mbean:type=HelloMBean,name=hello");
platformMBeanServer.registerMBean(hello, objectName);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}

启动程序后，再启动jconsole：
 

 

 

点击属性后，将属性修改为李四，点击下面的刷新。在点击hello MBean的操作:
 

 

属性已经修改为李四。查看控制台：

2023-06-03 16:37:19.095 INFO 71617 --- [on(7)-127.0.0.1] com.example.mytest.mbean.Hello : 李四

在web访问

如果要在web发布，可以使用HtmlAdaptorServer适配器，先引入依赖：

org.glassfish.external
opendmk_jdmkrt_jar
1.0-b01-ea

将启动类修改为：

@SpringBootApplication
@MapperScan("com.example.mytest.mapper")
public class MyTestApplication {

public static void main(String[] args) {
SpringApplication.run(MyTestApplication.class, args);

MBeanServer platformMBeanServer = ManagementFactory.getPlatformMBeanServer();

Hello hello = new Hello();
hello.setName("张三");
try {
ObjectName objectName = new ObjectName("com.example.mytest.mbean:type=HelloMBean,name=hello");
platformMBeanServer.registerMBean(hello, objectName);

HtmlAdaptorServer html = new HtmlAdaptorServer();
ObjectName adaptorName = new ObjectName("adapator:name=HtmlAdaptor");
html.setPort(9097);
MBeanServer platformMBeanServer1 = ManagementFactory.getPlatformMBeanServer();
platformMBeanServer1.registerMBean(html, adaptorName);
html.start();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}

访问http://localhost:9097/，看到：
 

 
点击type=HelloMBean,name=hello：
 

 

可以看到中文乱码了。

 

开放远程访问

如果要开放端口，可以添加JVM参数：

-Dcom.sun.management.jmxremote.port=19999
-Dcom.sun.management.jmxremote.authenticate=false
-Dcom.sun.management.jmxremote.ssl=false

第一个参数表示在19999端口监听JMX连接，第二个和第三个参数表示无需验证，不使用SSL连接，在开发测试阶段比较方便，生产环境必须指定验证方式并启用SSL。

 

启动后，在jconsole中输入：
 

 

二、自定义MXBean

public interface MyHelloExampleMXBean {

String getName();

void setName(String name) ;

String print();
}

public class MyHello implements MyHelloExampleMXBean{

private String name;

@Override
public String getName() {
return name;
}

@Override
public void setName(String name) {
this.name = name;
}

@Override
public String print() {
return name;
}
}

修改启动类:

@SpringBootApplication
@MapperScan("com.example.mytest.mapper")
public class MyTestApplication {

public static void main(String[] args) {
SpringApplication.run(MyTestApplication.class, args);

MBeanServer platformMBeanServer = ManagementFactory.getPlatformMBeanServer();

Hello hello = new Hello();
hello.setName("张三");

MyHello myHello = new MyHello();
myHello.setName("李四");
try {
ObjectName objectName = new ObjectName("com.example.mytest.mbean:type=HelloMBean,name=hello");
platformMBeanServer.registerMBean(hello, objectName);

platformMBeanServer = ManagementFactory.getPlatformMBeanServer();
objectName = new ObjectName("com.example.mytest.mbean:type=MyHelloExampleMXBean,name=myHello");
platformMBeanServer.registerMBean(myHello, objectName);

HtmlAdaptorServer html = new HtmlAdaptorServer();
ObjectName adaptorName = new ObjectName("adapator:name=HtmlAdaptor");
html.setPort(9097);
MBeanServer platformMBeanServer1 = ManagementFactory.getPlatformMBeanServer();
platformMBeanServer1.registerMBean(html, adaptorName);
html.start();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}

可以看到MyHelloExampleMXBean只要以MXBean结尾就可以随便命名。

三、在Spring中定义MBean

MyController:

@Value("${my.value}")
private String myValue;

private Set set = new HashSet<>();

public void add(String s) {
set.add(s);
}

public Set getSet() {
return set;
}

MyControllerMXBean

@Slf4j
@Component
@ManagedResource(objectName = "controller:name=myControllerMXBean", description = "MyController Attribute")
public class MyControllerMXBean {

@Autowired
private MyController myController;

@ManagedAttribute(description = "Get Configuration")
public String getMyValue() {
String myValue = myController.myValue();
log.info(myValue);
return myValue;
}

@ManagedAttribute(description = "Get Set")
public String getSet() {
Set set = myController.getSet();
return set.stream().collect(Collectors.joining());
}

@ManagedOperation
@ManagedOperationParameter(name = "s", description = "Add Set Element")
public void addSet(String s) {
myController.add(s);
}
}

@ManagedResource配置ObjectName,@ManagedOperation指示这是个操作。@ManagedAttribute用在方法上，指示这是个属性（必须符合JAVA Bean的规范，即有get，set方法）， @ManagedOperationParameter绑定参数。

 

用jconsole连接后：
 

 
调用addSet后再调用getSet查看添加的数据。getMyValue方法是为了演示可以调用到Spring Bean中的方法获取配置。