从Java Applet获取Windows Service Pack版本？

Question

I am writing a Java Applet. When run on Windows, I need to be able to get the clients OS version, eg Windows XP SP3 or Windows 2000 SP4.

I can currently use the following:

String os_name    = System.getProperty( "os.name" );
String os_version = System.getProperty( "os.version" );

System.out.println( "Running on " + os_name + "(" + os_version + ")" );

And it will output something like "Running on Windows 2000 (5.0)" which is great but I need to be able to get the service pack version too.

Anybody know how I can get the underlying service pack version of a Windows machine from within a Java applet? (Without throwing an AccessControlException, or ideally without having to self sign the applet).

Many thanks in advance.

Answer 1

You can self-sign your java applet:

(stolen from: http://www.captain.at/programming/java/ )

Make the certificate:

 keytool -export -alias yourkey -file yourcert.crt 

Now we have to sign the applet:

Just make a *.bat file including this:

 javac yourapplet.java jar cvf yourapplet.jar yourapplet.class jarsigner yourapplet.jar yourkey 

The batch-file compiles the applet, makes a jar-archive and signs the jar-file.

The HTML-code to display the applet:

 <applet code="yourapplet.class" archive="yourapplet.jar" width="600" 

height="500">

Now we are done! The applet is signed and if the user accepts the certificate, the applet is allowed to access local files. If the user doesn't agree, you get a java.security.AccessControlException .

So, as long as you don't mind about this little dialog box...

Answer 2

我认为您可以使用'sun.os.patch.level'属性获取它：

String os_sp = System.getProperty( "sun.os.patch.level" );

Answer 3

To get the OS version (major, minor, build, service pack) you can use JNA Documentation Here and any number of the windows libraries (version.dll, kernel32.dll, user32.dll, etc). I based my project on Daniel Doubrovkine's project Operating System and Hardware Information . His project will also query the hardware, which I didn't need. The nice thing is it will also allow you to read/write to the registry.

import com.sun.jna.Native;
import com.sun.jna.platform.win32.Advapi32Util;
import com.sun.jna.platform.win32.Kernel32;
import com.sun.jna.platform.win32.User32;
import com.sun.jna.platform.win32.Win32Exception;
import com.sun.jna.platform.win32.WinNT;
import com.sun.jna.platform.win32.WinNT.OSVERSIONINFOEX;
import com.sun.jna.platform.win32.WinReg;
import com.sun.jna.platform.win32.WinUser;

/**
 *
 * @author geverding
 */
public class OSVersionInfo {

    private OSVERSIONINFOEX versionInfo;
    private static OSVersionInfo instance = new OSVersionInfo();

    public static OSVersionInfo Istance() {
        return instance;
    }

    public OSVersionInfo() {
        versionInfo = new OSVERSIONINFOEX();
        if (!Kernel32.INSTANCE.GetVersionEx(versionInfo))
        {
            throw new Win32Exception(Kernel32.INSTANCE.GetLastError());
        }
    }

    public int getMajor() {
        return versionInfo.dwMajorVersion.intValue();
    }

    public int getMinor() {
        return versionInfo.dwMinorVersion.intValue();
    }

    public int getBuild() {
        return versionInfo.dwBuildNumber.intValue();

    }

    public String getServicePack() {
        return Native.toString(versionInfo.szCSDVersion);
    }

    @Override
    public String toString() {
        String version = null;

        if (versionInfo.dwPlatformId.intValue() == WinNT.VER_PLATFORM_WIN32_NT)
        {
            // 7
            if (versionInfo.dwMajorVersion.intValue() == 6
                    && versionInfo.dwMinorVersion.intValue() == 1
                    && versionInfo.wProductType == WinNT.VER_NT_WORKSTATION)
            {
                version = "7";
            } // Server 2008 R2
            else if (versionInfo.dwMajorVersion.intValue() == 6
                    && versionInfo.dwMinorVersion.intValue() == 1
                    && versionInfo.wProductType != WinNT.VER_NT_WORKSTATION)
            {
                version = "Server 2008 R2";
            } // Server 2008
            else if (versionInfo.dwMajorVersion.intValue() == 6
                    && versionInfo.dwMinorVersion.intValue() == 0
                    && versionInfo.wProductType != WinNT.VER_NT_WORKSTATION)
            {
                version = "Server 2008";
            } // Vista
            else if (versionInfo.dwMajorVersion.intValue() == 6
                    && versionInfo.dwMinorVersion.intValue() == 0
                    && versionInfo.wProductType == WinNT.VER_NT_WORKSTATION)
            {
                version = "Vista";
            } // Server 2003
            else if (versionInfo.dwMajorVersion.intValue() == 5
                    && versionInfo.dwMinorVersion.intValue() == 2
                    && versionInfo.wProductType != WinNT.VER_NT_WORKSTATION
                    && User32.INSTANCE.GetSystemMetrics(WinUser.SM_SERVERR2) != 0)
            {
                version = "Server 2003";
            } // Server 2003 R2
            else if (versionInfo.dwMajorVersion.intValue() == 5
                    && versionInfo.dwMinorVersion.intValue() == 2
                    && versionInfo.wProductType != WinNT.VER_NT_WORKSTATION
                    && User32.INSTANCE.GetSystemMetrics(WinUser.SM_SERVERR2) == 0)
            {
                version = "Server 2003 R2";
            } // XP 64 bit
            else if (versionInfo.dwMajorVersion.intValue() == 5
                    && versionInfo.dwMinorVersion.intValue() == 2
                    && versionInfo.wProductType == WinNT.VER_NT_WORKSTATION)
            {
                version = "XP";
            } // XP 32 bit
            else if (versionInfo.dwMajorVersion.intValue() == 5
                    && versionInfo.dwMinorVersion.intValue() == 1)
            {
                version = "XP";
            } // 2000
            else if (versionInfo.dwMajorVersion.intValue() == 5
                    && versionInfo.dwMinorVersion.intValue() == 0)
            {
                version = "2000";
            } // Windows NT
            else if (versionInfo.dwMajorVersion.intValue() == 4)
            {
                version = "NT 4";

                if ("Service Pack 6".equals(Native.toString(versionInfo.szCSDVersion)))
                {
                    if (Advapi32Util.registryKeyExists(WinReg.HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\WindowsNT\\CurrentVersion\\Hotfix\\Q246009"))
                    {

                        return "NT4 SP6a";
                    }
                }

            } else
            {
                throw new RuntimeException("Unsupported Windows NT version: "
                        + versionInfo.toString());
            }

            if (versionInfo.wServicePackMajor.intValue() > 0)
            {
                version = version + " SP" + versionInfo.wServicePackMajor.intValue();
            }

        } else if (versionInfo.dwPlatformId.intValue() == WinNT.VER_PLATFORM_WIN32_WINDOWS)
        {
            if (versionInfo.dwMajorVersion.intValue() == 4
                    && versionInfo.dwMinorVersion.intValue() == 90)
            {
                version = "ME";
            } else if (versionInfo.dwMajorVersion.intValue() == 4
                    && versionInfo.dwMinorVersion.intValue() == 10)
            {
                if (versionInfo.szCSDVersion[1] == 'A')
                {
                    version = "98 SE";
                } else
                {
                    version = "98";
                }
            } else if (versionInfo.dwMajorVersion.intValue() == 4
                    && versionInfo.dwMinorVersion.intValue() == 0)
            {
                if (versionInfo.szCSDVersion[1] == 'C' || versionInfo.szCSDVersion[1] == 'B')
                {
                    version = "95 OSR2";
                } else
                {
                    version = "95";
                }
            } else
            {
                throw new RuntimeException("Unsupported Windows 9x version: "
                        + versionInfo.toString());
            }
        } else
        {
            throw new RuntimeException("Unsupported Windows platform: "
                    + versionInfo.toString());
        }

        return version;
    }
}

Answer 4

Put simply you can't get the value of the sun.os.patch.level property without throwing an AccessControlException.

Applets have security restrictions imposed on.

The only thing you can do is to read on signed applets and policy files for applets