Get System Information of a Remote Machine (Using

问题:

As the question's title says, I want to get the system information (like OS name, version, etc.) of a remote system using Java. But before anyone answers this question, I just want to ask whether this is possible, if yes, then how?

One more catch is that this should work for both Unix-based and Windows-based systems. I tried searching the Internet, but drew a blank (almost).

EDIT: The Java app will be a desktop app, and it will have to credentials to be able to log onto the remote system, but there will be no HTTP/RMI that'll be used.

回答1:

You need to clarify what you mean by "remote system" in this case - as in how are you communicating with it> Are we talking some form of HTTP? RMI? Applet running in a browser?

Generally, however, the answer is "No, it's not possible".

回答2:

For Windows you should be able to access WMI on the remote machine (with some ugly JNI glue), for UNIX systems I don't know of a way (unless you somehow have shell access, then you can probably try logging in via SSH and do a uname -a or similar). It's going to be a lot of work in either case and Java is hardly the right tool for that.

回答3:

well as mentioned above, you can try them. By the way after getting connected you can use following codes:(if you wish)

 import java.util.Properties;
  public class GetCompleteSystemInfo {

public static void main(String args[]) {
    //1.Get Java Runtime
    Runtime runtime = Runtime.getRuntime();
    System.out.println("Runtime=" + Runtime.getRuntime());

    //2. Get Number of Processor availaible to JVM
    int numberOfProcessors = runtime.availableProcessors();
    System.out.println(numberOfProcessors + " Processors ");

    //2. Get FreeMemory, Max Memory and Total Memory
    long freeMemory = runtime.freeMemory();
    System.out.println("Bytes=" + freeMemory + " |KB=" + freeMemory / 1024 + " |MB=" + (freeMemory / 1024) / 1024+" Free Memory in JVM");

    long maxMemory = runtime.maxMemory();
    System.out.println(maxMemory + "-Bytes " + maxMemory / 1024 + "-KB  " + (maxMemory / 1024) / 1024 + "-MB " + " Max Memory Availaible in JVM");

    long totalMemory = runtime.totalMemory();
    System.out.println(totalMemory + "-Bytes " + totalMemory / 1024 + "-KB " + (totalMemory / 1024) / 1024 + "-MB " + " Total Memory Availaible in JVM");


    //3. Suggest JVM to Run Garbage Collector
    runtime.gc();

    //4. Suggest JVM to Run Discarded Object Finalization
    runtime.runFinalization();

    //5. Terminate JVM
    //System.out.println("About to halt the current jvm");//not to be run always
    //runtime.halt(1);
    // System.out.println("JVM Terminated");

    //6. Get OS Name
    String strOSName = System.getProperty("os.name");
    if (strOSName != null) {
        if (strOSName.toLowerCase().indexOf("windows") != -1) {
            System.out.println("This is "+strOSName);
        } else {
            System.out.print("Can't Determine");
        }
    }

    //7. Get JVM Spec
    String strJavaVersion = System.getProperty("java.specification.version");
    System.out.println("JVM Spec : " + strJavaVersion);
    //8. Get Class Path
    String strClassPath = System.getProperty("java.class.path");
    System.out.println("Classpath: " + strClassPath);

    //9. Get File Separator
    String strFileSeparator = System.getProperty("file.separator");
    System.out.println("File separator: " + strFileSeparator);

    //10. Get System Properties
    Properties prop = System.getProperties();
    System.out.println("System Properties(detail): " + prop);

    //11. Get System Time
    long lnSystemTime = System.currentTimeMillis();
    System.out.println("Milliseconds since midnight, January 1, 1970 UTC : " + lnSystemTime + "\nSecond=" + lnSystemTime / 1000 + "\nMinutes=" + (lnSystemTime / 1000) / 60 + ""
            + "\nHours=" + ((lnSystemTime / 1000) / 60) / 60 + "\nDays=" +   (((lnSystemTime / 1000) / 60) / 60) / 24 + "\nYears=" + ((((lnSystemTime / 1000) / 60) /  60) / 24) / 365);
      }
   }

回答4:

This is a common problem in monitoring a large site comprised of scores or hundreds of machines. There are open source solutions like Zenoss and Nagios. SNMP is a widely supported standard in this space too (and there are ways to connect them into a Java-based "dashboard").

回答5:

You either need help from the remote system (i.e. an application running there that announces the data - which web browsers do, but only to the servers they visit) or access to low-level network APIs that allow a technique called OS fingerprinting. However, Java's network APIs are not low-level enough for that.

回答6:

You either need help from the remote system (i.e. an application running there that announces the data - which web browsers do, but only to the servers they visit) or access to low-level network APIs that allow a technique called OS fingerprinting. However, Java's network APIs are not low-level enough for that.

回答7:

Try to use low level networking API such SNMP and UPnP. SNMP need an agent activated/installed in the remote system and you will have this information on the MIB. And the UPnP can do that, (i don't know how exactly, but i'm sure that is can be done).