给出一个例程吧
（1）它需要Jboss的jbossall-client.jar包的支持
（2）运行环境为Jboss3.2.6 + jdk5.0 + eclipse3.2M2。jdk5.0内置了JMX支持，如果你不是jdk5.0的话eclipse可能会报有会类找不到的错误
（3）之前必须选启动Jboss
import java.util.Iterator;
import java.util.Properties;
import java.util.Set;
import javax.management.MBeanInfo;
import javax.management.MBeanOperationInfo;
import javax.management.MBeanParameterInfo;
import javax.management.ObjectInstance;
import javax.management.ObjectName;
import javax.naming.InitialContext;
import org.jboss.jmx.adaptor.rmi.RMIAdaptor;
public class TestJMX {
public static void main(String[] args) throws Exception {
//Get RMIAdaptor Object
Properties pro = new Properties();
pro.setProperty("java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory");
pro.setProperty("java.naming.provider.url", "jnp://localhost:1099");
pro.setProperty("java.naming.factory.url.pkgs", "org.jboss.naming:org.jnp.interfaces");
InitialContext ic = new InitialContext(pro);
RMIAdaptor server = (RMIAdaptor) ic.lookup("jmx/rmi/RMIAdaptor");
// Get the MBeanInfo for the JNDIView MBean
ObjectName name = new ObjectName("jboss:service=JNDIView");
MBeanInfo info = server.getMBeanInfo(name);
System.out.println("JNDIView Class: " + info.getClassName());
MBeanOperationInfo[] opInfo = info.getOperations();
System.out.println("JNDIView Operations: ");
for (int o = 0; o < opInfo.length; o++) {
MBeanOperationInfo op = opInfo[o];
String returnType = op.getReturnType();
String opName = op.getName();
System.out.print(" + " + returnType + " " + opName + "(");
MBeanParameterInfo[] params = op.getSignature();
for (int p = 0; p < params.length; p++) {
MBeanParameterInfo paramInfo = params[p];
String pname = paramInfo.getName();
String type = paramInfo.getType();
if (pname.equals(type))
System.out.print(type);
else
System.out.print(type + " " + name);
if (p < params.length - 1)
System.out.print(',');
}
System.out.println(")");
}
//Get all MBeans
Set mbSet = server.queryMBeans(null, null); //
for (Iterator it = mbSet.iterator(); it.hasNext();) {
ObjectInstance oi = (ObjectInstance) it.next();
System.out.println(oi.getObjectName());
}
}
这里有一段网上找到的代码,正好是实现了配置文件修改后重读的功能.
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.URL;
import java.util.Properties;
/**
* @author Robbin Fan
*/
public class ConfigUtil {
private static Properties props = null;
private static File configFile = null;
private static long fileLastModified = 0L;
private static void init() {
URL url = ConfigUtil.class.getClassLoader().getResource("global.properties");
configFile = new File(url.getFile());
fileLastModified = configFile.lastModified();
props = new Properties();
load();
}
private static void load() {
try {
props.load(new FileInputStream(configFile));
fileLastModified = configFile.lastModified();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public static String getConfig(String key) {
if ((configFile == null) || (props == null))
init();
if (configFile.lastModified() > fileLastModified)
load();
return props.getProperty(key);
}
}
如果MBean就在本地，则可以用下面的方法来获得：
ThreadPoolMBean poolMBean = (ThreadPoolMBean) MBeanProxyExt.create(ThreadPoolMBean.class, objName);
还有一种远程获得的方法（从开源代码中看到的，未验证）
ThreadPoolMBean poolMBean = (ThreadPoolMBean) MBeanServerInvocationHandler.newProxyInstance(mbeanServer, objName, ThreadPoolMBean.class, false);