Question

您好我想将jboss 7显示为java代码中的进程信息和数据库会话信息... 我试试这段代码：

Process p = Runtime.getRuntime().exec
                    (System.getenv("windir") +"\\system32\\"+"tasklist.exe");

和这段代码：

Process p = Runtime.getRuntime().exec
                    ("C:\\Users\\user\\Downloads\\PSTools\\pslist.exe -s 2");

它运行良好，但它只适用于Windows操作系统。所以我想要一个适用于每个操作系统的java代码，而不仅仅是在windows或linux上... 你可以帮我吗？谢谢大家。

Answer 1

在同一主机上查找java进程非常简单（稍后列出一些警告）。也可以实现与JMX接口的连接。就跟踪数据库会话而言，只要通过可访问的MBean发布，您就可以在概念上获取所需的任何数据。

该过程需要使用Java Attach API。这是一个简单的例子，我将列出在我的主机上运行的所有JVM，尝试连接到它们并列出它们的堆使用情况。

首先，这里是进口商品：

import java.io.File;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryUsage;
import java.util.List;

import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
import javax.management.openmbean.CompositeData;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;

import com.sun.tools.attach.VirtualMachine;
import com.sun.tools.attach.VirtualMachineDescriptor;

com.sun.tools.attach 类位于JVM的 tools.jar 中。这是代码：

public class AttachAPIExample {

    /**
     * Uses the attach API to locate all JVMs accessible on this machine.
     * @param args None
     */
    public static void main(String[] args) {
        // Get my PID
        final String MYPID = ManagementFactory.getRuntimeMXBean().getName().split("@")[0];
        log("Scanning for JVMs...");
        // List all the Virtual Machine Descriptors
        List<VirtualMachineDescriptor> descriptors = VirtualMachine.list(); 
        for(VirtualMachineDescriptor vmd: descriptors) {
            VirtualMachine vm = null;
            // Do this in a catch block in case we run into a JVM that is not the same "bit" as we are
            try {
                vm = vmd.provider().attachVirtualMachine(vmd.id());
                String display = vmd.displayName().trim().isEmpty() ? "Unknown" : vmd.displayName();
                log("JVM%sPID: %s Display: %s", vmd.id().equals(MYPID) ? " (Me) " : " ", vmd.id(), display);
                String connectorAddress = vm.getAgentProperties().getProperty("com.sun.management.jmxremote.localConnectorAddress", null);
                if(connectorAddress!=null) {
                    log("\tConnector Found Installed at [%s]", connectorAddress);
                } else {
                    String javaHome = vm.getSystemProperties().getProperty("java.home");
                    File agentJarFile = new File(javaHome + File.separator + "lib" + File.separator + "management-agent.jar");
                    if(agentJarFile.exists()) {
                        log("I think we can find this JVM's management agent here: [%s]", agentJarFile.toString());
                        vm.loadAgent(agentJarFile.getAbsolutePath());
                        connectorAddress = vm.getAgentProperties().getProperty("com.sun.management.jmxremote.localConnectorAddress", null);
                        log("\tConnector Installed at [%s]", connectorAddress);
                    } else {
                        log("Cannot find the agent jar for JVM [%s] at [%s]", vmd.id(), javaHome);
                    }
                }
                // Now lets try and connect and read some MBean values
                if(connectorAddress!=null) {
                    log("Attaching to JVM [%s]...", vmd.id());
                    JMXServiceURL jmxUrl = new JMXServiceURL(connectorAddress);
                    JMXConnector connector = null;
                    try {
                        connector = JMXConnectorFactory.connect(jmxUrl);
                        MBeanServerConnection conn = connector.getMBeanServerConnection();
                        MemoryUsage heap = MemoryUsage.from((CompositeData)conn.getAttribute(new ObjectName(ManagementFactory.MEMORY_MXBEAN_NAME), "HeapMemoryUsage"));
                        log("Heap Usage: %s", heap);
                    } finally {
                        if(connector!=null) {
                            try { connector.close(); } catch (Exception ex) {/* No Op */}
                        }
                    }
                }
            } catch (Exception ex) {
                /* No Op */
            } finally {
                if(vm!=null) try { vm.detach(); } catch (Exception ex) {/* No Op */}
                             log("======================================");
            }
        }

    }

    public static void log(String fmt, Object...args) {
        System.out.println(String.format(fmt, args));
    }

}

以下是一些示例输出：

Scanning for JVMs...
JVM PID: 27928 Display: sun.tools.jconsole.JConsole
    Connector Found Installed at [service:jmx:rmi://127.0.0.1/stub/rO0ABXNyAC5qYXZheC5tYW5hZ2VtZW50LnJlbW90ZS5ybWkuUk1JU2VydmVySW1wbF9TdHViAAAAAAAAAAICAAB4cgAaamF2YS5ybWkuc2VydmVyLlJlbW90ZVN0dWLp/tzJi+FlGgIAAHhyABxqYXZhLnJtaS5zZXJ2ZXIuUmVtb3RlT2JqZWN002G0kQxhMx4DAAB4cHc3AAtVbmljYXN0UmVmMgAADDEwLjEyLjExNC4zNwAA9bhcC21U1Z9PMPLlR/0AAAFAxsF5moACAHg=]
Attaching to JVM [27928]...
Heap Usage: init = 8388608(8192K) used = 40242696(39299K) committed = 44236800(43200K) max = 5726666752(5592448K)
======================================
JVM PID: 25028 Display: org.jboss.Main -c ecseu -b 0.0.0.0
I think we can find this JVM's management agent here: [c:\java\jdk1.6.0_30\jre\lib\management-agent.jar]
    Connector Installed at [service:jmx:rmi://127.0.0.1/stub/rO0ABXNyAC5qYXZheC5tYW5hZ2VtZW50LnJlbW90ZS5ybWkuUk1JU2VydmVySW1wbF9TdHViAAAAAAAAAAICAAB4cgAaamF2YS5ybWkuc2VydmVyLlJlbW90ZVN0dWLp/tzJi+FlGgIAAHhyABxqYXZhLnJtaS5zZXJ2ZXIuUmVtb3RlT2JqZWN002G0kQxhMx4DAAB4cHc4AAtVbmljYXN0UmVmMgAADVBQLVdLLU5XSEktMDEAAPjJTzYbxtjrUKazaPTEAAABQMuKX+6ABAB4]
Attaching to JVM [25028]...
Heap Usage: init = 1073741824(1048576K) used = 173876432(169801K) committed = 982581248(959552K) max = 982581248(959552K)
======================================

<强>注意事项

JMV只能附加到相应的位JVM（即32位到32位，64位到64位）
启动附件的操作系统用户必须具有操作系统授权才能访问其他已处理的操作系统。所以同样的用户，没问题。其他用户......你应该是root。
当在不同的JVM供应商实现中使用时，attach api具有混合结果。即。如果它是Sun / Oracle / OpenJDK，你可能很好。如果是那些，并且您正在尝试连接到IBM JVM（反之亦然），那么我不知道会发生什么，尽管JRockit在这方面似乎相当友好。
我不知道所有警告。

用于显示进程的Java命令

1 个答案: