用Java获取服务器显卡信息

要获取服务器显卡信息，可以使用Java程序访问操作系统的API或者使用第三方库来获取。下面是一个使用JNA库获取显卡信息的示例代码：

import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.Structure;
import com.sun.jna.ptr.IntByReference;
import com.sun.jna.win32.StdCallLibrary;

public class GPUInfo {

    public static void main(String[] args) {
        try {
            GPUInfo.GPU gpu = GPUInfo.getGPU();
            System.out.println(gpu.toString());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static GPU getGPU() throws Exception {
        GPU gpu = new GPU();
        NVAPI.NvAPI_Initialize();
        NvPhysicalGpuHandle gpuHandle = new NvPhysicalGpuHandle();
        NVAPI.NvAPI_EnumPhysicalGPUs(gpuHandle);
        NV_DISPLAY_DRIVER_MEMORY_INFO memInfo = new NV_DISPLAY_DRIVER_MEMORY_INFO();
        memInfo.version = NV_DISPLAY_DRIVER_MEMORY_INFO_VER;
        NVAPI.NvAPI_GPU_GetMemoryInfo(gpuHandle, memInfo);
        gpu.memoryTotal = memInfo.memorySize;
        gpu.memoryUsed = memInfo.memoryUsed;
        gpu.memoryFree = gpu.memoryTotal - gpu.memoryUsed;
        return gpu;
    }

    public static class GPU {
        public int memoryTotal;
        public int memoryUsed;
        public int memoryFree;

        @Override
        public String toString() {
            return "GPU{" +
                    "memoryTotal=" + memoryTotal +
                    ", memoryUsed=" + memoryUsed +
                    ", memoryFree=" + memoryFree +
                    '}';
        }
    }

    public interface NVAPI extends Library {
        int NVAPI_MAX_PHYSICAL_GPUS = 64;
        int NVAPI_MAX_USAGES_PER_GPU = 34;

        int NVAPI_INTERFACE_VERSION = 0x0100E900;
        int NVAPI_GENERIC_STRING_MAX = 4096;

        int ERROR_SUCCESS = 0;
        int ERROR_INVALID_PARAMETER = -1;
        int ERROR_NOT_SUPPORTED = -2;
        int ERROR_NVIDIA_DEVICE_NOT_FOUND = -3;
        int ERROR_FUNCTION_NOT_FOUND = -4;
        int ERROR_NVIDIA_DRIVER_NOT_LOADED = -5;

        NVAPI INSTANCE = (NVAPI) Native.loadLibrary("nvapi64", NVAPI.class);

        int NvAPI_Initialize();

        int NvAPI_EnumPhysicalGPUs(NvPhysicalGpuHandle[] gpuHandles);

        int NvAPI_GPU_GetMemoryInfo(NvPhysicalGpuHandle gpuHandle, NV_DISPLAY_DRIVER_MEMORY_INFO pMemoryInfo);
    }

    public interface NV_DISPLAY_DRIVER_MEMORY_INFO_VER {
    }

    public static class NvPhysicalGpuHandle extends Structure {
        public byte[] data = new byte[4];
    }

    public static class NV_DISPLAY_DRIVER_MEMORY_INFO extends Structure {
        public int version;
        public int values[];
    }
}

需要注意的是，这个代码只能在Windows系统上运行，并且需要安装NVIDIA显卡驱动程序。如果你的服务器使用的是其他操作系统或者其他显卡品牌，需要使用相应的API或者库来获取显卡信息。