fix(ProcessUtil): 优化跨平台进程PID获取逻辑

ruoshui-core/src/main/java/com/ruoshui/core/util/ProcessUtil.java

@@ -30,6 +30,7 @@ public class ProcessUtil {
     public static String getProcessId(Process process) {
         long pid = -1;
         Field field;
+
         if (Platform.isWindows()) {
             try {
                 field = process.getClass().getDeclaredField("handle");
@@ -39,6 +40,12 @@ public class ProcessUtil {
                 logger.error("get process id for windows error {0}", ex);
             }
         } else if (Platform.isLinux() || Platform.isAIX()) {
+            // 方式一：系统属性
+            logger.info("JDK Version: {}", System.getProperty("java.version"));
+
+            // 方式二：Runtime.version() (Java 9+)
+            logger.info("JDK Version2: {}", Runtime.version());  
+                    
             try {
                 // Class<?> clazz = Class.forName("java.lang.UNIXProcess");
                 // field = clazz.getDeclaredField("pid");
@@ -63,13 +70,11 @@ public class ProcessUtil {
                     // Java 9+ 推荐方式：ProcessHandle API
                     pid = ((ProcessHandle) process).pid();
                 } else {
-
-                    logger.error("jdk8 换方法执行");
-                    Class<?> clazz = Class.forName("java.lang.UNIXProcess");
+                    // JDK 9+ 降级方案：使用实际进程类反射获取 pid
+                    Class<?> clazz = process.getClass();
                     Field declaredField = clazz.getDeclaredField("pid");
                     declaredField.setAccessible(true);
-                    pid = declaredField.getInt(process);
-                    // throw new UnsupportedOperationException("不支持当前JDK的进程ID获取");
+                    pid = declaredField.getLong(process);
                 }
 
             } catch (NoSuchMethodError e) {