jdk6 OperatingSystemMXBean.TotalPhysicalMemorySize windows2003下得不到真实的内存值（大于2G）

jdk6中 OperatingSystemMXBean.TotalPhysicalMemorySize， windows2003下得不到真实的内存值（大于2G），这个BUG已经被修改在新的版本中
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6853676，
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6628662
如果你不想升级JDK而且又必须使用这个几个函数的话，可以使用JNI的方法重写这个几个函数
JNIEXPORT jlong JNICALL
Java_com_sun_management_OperatingSystem_getTotalSwapSpaceSize
   (JNIEnv *env, jobject mbean)
{
-    MEMORYSTATUS ms;
-    GlobalMemoryStatus(&ms);
-    return (jlong)ms.dwTotalPageFile;
+    MEMORYSTATUSEX ms;
+    ms.dwLength = sizeof(ms);
+    GlobalMemoryStatusEx(&ms);
+    return (jlong) ms.ullTotalPageFile;
}

JNIEXPORT jlong JNICALL
Java_com_sun_management_OperatingSystem_getFreeSwapSpaceSize
   (JNIEnv *env, jobject mbean)
{
-    MEMORYSTATUS ms;
-    GlobalMemoryStatus(&ms);
-    return (jlong)ms.dwAvailPageFile;
+    MEMORYSTATUSEX ms;
+    ms.dwLength = sizeof(ms);
+    GlobalMemoryStatusEx(&ms);
+    return (jlong) ms.ullAvailPageFile;
}

JNIEXPORT jlong JNICALL
Java_com_sun_management_OperatingSystem_getFreePhysicalMemorySize
   (JNIEnv *env, jobject mbean)
{
-    MEMORYSTATUS ms;
-    GlobalMemoryStatus(&ms);
-    return (jlong) ms.dwAvailPhys;
+    MEMORYSTATUSEX ms;
+    ms.dwLength = sizeof(ms);
+    GlobalMemoryStatusEx(&ms);
+    return (jlong) ms.ullAvailPhys;
}

JNIEXPORT jlong JNICALL
Java_com_sun_management_OperatingSystem_getTotalPhysicalMemorySize
   (JNIEnv *env, jobject mbean)
{
-    MEMORYSTATUS ms;
-    // also returns dwAvailPhys (free physical memory bytes),
-    // dwTotalVirtual, dwAvailVirtual,
+    MEMORYSTATUSEX ms;
+    ms.dwLength = sizeof(ms);
+    // also returns ullAvailPhys (free physical memory bytes),
+    // ullTotalVirtual, ullAvailVirtual,
     // dwMemoryLoad (% of memory in use)
-    GlobalMemoryStatus(&ms);
-    return ms.dwTotalPhys;
+    GlobalMemoryStatusEx(&ms);
+    return (jlong) ms.ullTotalPhys;
}