网站导入页欣赏,ie建设企业网站进去无法显示,室内设计师之家,公司官网优化在 Windows 系统中#xff0c;获取设备唯一性标识及定位信息对设备管理、安全监控等场景意义重大。本文介绍 Java 中几种实现方法#xff0c;如 JNA 库、WMI4Java 库及通过 JNI 结合 Windows API。
1. 使用 JNA 库读取 DEVPKEY_Device_ContainerId
在 Windows 系统中…在 Windows 系统中获取设备唯一性标识及定位信息对设备管理、安全监控等场景意义重大。本文介绍 Java 中几种实现方法如 JNA 库、WMI4Java 库及通过 JNI 结合 Windows API。
1. 使用 JNA 库读取 DEVPKEY_Device_ContainerId
在 Windows 系统中DEVPKEY_Device_ContainerId是获取设备容器唯一标识符的属性键。设备容器含多个相关设备此标识符可区分不同设备集合。Java 无直接获取该属性的方法可借助 JNA Java Native Access库访问 Windows 底层接口实现读取。
引入 JNA 库
若用 Maven 管理项目在pom.xml添加如下依赖。 dependencygroupIdnet.java.dev.jna/groupIdartifactIdjna/artifactIdversion5.13.0/version/dependency代码示例
以下是读取DEVPKEY_Device_ContainerId的示例代码。代码中的{设备容器路径}要换成实际在注册表中的路径类似{数字和字母组合}可查看 Windows 注册表确定。此代码用Advapi32Util类的registryGetStringValue方法从注册表读取指定键值对应的字符串值访问HKEY_LOCAL_MACHINE下特定路径获取DEVPKEY_Device_ContainerId对应的设备容器唯一标识符。 import com.sun.jna.platform.win32.Advapi32Util;import com.sun.jna.platform.win32.WinReg;public class WindowsDeviceIdReader {public static void main(String[] args) {String containerId Advapi32Util.registryGetStringValue(WinReg.HKEY_LOCAL_MACHINE,SYSTEM\\CurrentControlSet\\Control\\DeviceContainers\\{设备容器路径}\\Properties,{DEVPKEY_Device_ContainerId});System.out.println(设备容器ID: containerId);}}2. 使用 WMI4Java 库通过 WMI 读取设备信息
Windows Management InstrumentationWMI是微软管理技术可供管理员和开发者统一查询与管理 Windows 系统资源包括硬件设备、软件组件等。WMI4Java 库为 Java 程序访问 WMI 提供便捷途径。
添加依赖
若用 Maven 管理项目在pom.xml添加如下依赖。 dependencygroupIdorg.boris.winrun4j/groupIdartifactIdwmi4java/artifactIdversion1.5.0/version/dependency代码示例
先创建“WMI”对象获取“Win32_PhysicalMedia”类实例该类含物理设备如硬盘信息遍历可获设备序列号这一唯一性标识。不同设备类如“Win32_NetworkAdapter”用于网络适配器能提供不同设备标识信息。 import org.boris.winrun4j.wmi.WMI;import org.boris.winrun4j.wmi.WMIException;import org.boris.winrun4j.wmi.WMIClass;import org.boris.winrun4j.wmi.WMIObject;public class WMIDeviceIdReader {public static void main(String[] args) {try {WMI wmi new WMI();// 查询Win32_PhysicalMedia类获取设备信息WMIClass c wmi.getWMIClass(Win32_PhysicalMedia);for (WMIObject o : c.instances()) {String serialNumber o.get(SerialNumber).toString();System.out.println(设备序列号唯一性标识之一: serialNumber);}} catch (WMIException e) {e.printStackTrace();}}}3. 使用 Java 本地接口JNI结合 Windows API
JNI 允许 Java 代码与其他语言如 C/C编写的代码交互。Windows 提供了一系列 API 用于获取设备信息例如SetupDiGetDeviceInstanceId函数可获取设备实例 ID这是设备的一种唯一性标识。
编写 C/C代码
C获取设备实例 ID 示例。代码先通过SetupDiGetClassDevs获取设备信息集再用SetupDiEnumDeviceInfo和SetupDiGetDeviceInstanceId获取首个设备实例 ID 存于传入缓冲区。 #include windows.h#include setupapi.h#include stdio.hextern C {__declspec(dllexport) void getDeviceInstanceId(char* buffer, DWORD bufferSize) {HDEVINFO deviceInfoSet SetupDiGetClassDevs(NULL, NULL, NULL, DIGCF_PRESENT);if (deviceInfoSet INVALID_HANDLE_VALUE) {return;}SP_DEVINFO_DATA deviceInfoData;deviceInfoData.cbSize sizeof(SP_DEVINFO_DATA);if (SetupDiEnumDeviceInfo(deviceInfoSet, 0, deviceInfoData)) {DWORD requiredSize;SetupDiGetDeviceInstanceId(deviceInfoSet, deviceInfoData, buffer, bufferSize, requiredSize);}SetupDiDestroyDeviceInfoList(deviceInfoSet);}}编译为动态链接库DLL
使用 Visual C编译器时可在命令行执行cl /LD getDeviceInstanceId.cpp代码存于该文件进行编译编译步骤因编译器而异。
在 Java 中调用 DLL
Java 示例代码用System.loadLibrary加载编译好的 DLL定义本地方法getDeviceInstanceId在main方法中调用该方法获取设备实例 ID注意替换yourDLLName为实际 DLL 名称。 class DeviceIdJNI {static {System.loadLibrary(yourDLLName); // 替换为实际的DLL名称}public native void getDeviceInstanceId(byte[] buffer, int bufferSize);public static void main(String[] args) {DeviceIdJNI deviceIdJNI new DeviceIdJNI();byte[] buffer new byte[1024];deviceIdJNI.getDeviceInstanceId(buffer, buffer.length);String deviceInstanceId new String(buffer).trim();System.out.println(设备实例ID: deviceInstanceId);}}4. 总结
JNA 库便捷但受限特定属性读取。WMI4Java 库简单但受 WMI 限制且性能可能不足。JNI 结合 Windows API 能灵活获取底层设备信息但编写维护复杂且要求开发者了解 Windows API 和 C/C编程。 What is Java technology and why do I need it? Java is a programming language and computing platform first released by Sun Microsystems in 1995. It has evolved from humble beginnings to power a large share of today’s digital world, by providing the reliable platform upon which many services and applications are built. New, innovative products and digital services designed for the future continue to rely on Java, as well.
While most modern Java applications combine the Java runtime and application together, there are still many applications and even some websites that will not function unless you have a desktop Java installed. Java.com, this website, is intended for consumers who may still require Java for their desktop applications – specifically applications targeting Java 8. Developers as well as users that would like to learn Java programming should visit the dev.java website instead and business users should visit oracle.com/java for more information.
Is Java free to download? Yes, Java is free to download for personal use. Java is also free for development: developers can find all the development kits and other useful tools at https://www.oracle.com/javadownload/.
Why should I upgrade to the latest Java patch each quarter when prompted? The latest Java patches contain important enhancements to improve performance, stability and security of the Java applications that run on your machine. Installing these updates will ensure that your Java applications continue to run with the most up-to-date version.
