java代码通过端口号找到jvm，并输出GC的伊甸区、幸存者区、老年代的初始空间、已使用空间、已分配空间、最大空间

要实现这个功能，需要使用Java Management Extensions（JMX）API。下面是一个基本的代码示例：

import java.lang.management.ManagementFactory;
import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
import com.sun.management.GarbageCollectorMXBean;
import com.sun.management.GcInfo;

public class GCStatsExample {
    public static void main(String[] args) throws Exception {
        // 获取当前JVM的MBeanServer连接
        MBeanServerConnection mbsc = ManagementFactory.getPlatformMBeanServer();

        // 获取所有的GC MXBean
        ObjectName gcName = new ObjectName("java.lang:type=GarbageCollector,name=*");
        java.util.List<GarbageCollectorMXBean> gcBeans = java.util.stream.Collectors.toList(
            ManagementFactory.getGarbageCollectorMXBeans().stream()
                .filter(bean -> bean instanceof com.sun.management.GarbageCollectorMXBean)
                .map(bean -> (com.sun.management.GarbageCollectorMXBean) bean)
                .collect(java.util.stream.Collectors.toList())
        );

        // 输出GC的统计信息
        for (GarbageCollectorMXBean gcBean : gcBeans) {
            System.out.println(gcBean.getName() + ":");
            GcInfo gcInfo = gcBean.getLastGcInfo();
            if (gcInfo != null) {
                System.out.println("  Eden Space:");
                System.out.println("    Initial Space: " + gcInfo.getMemoryUsageBeforeGc().get("PS Eden Space").getInit());
                System.out.println("    Used Space: " + gcInfo.getMemoryUsageBeforeGc().get("PS Eden Space").getUsed());
                System.out.println("    Committed Space: " + gcInfo.getMemoryUsageBeforeGc().get("PS Eden Space").getCommitted());
                System.out.println("    Maximum Space: " + gcInfo.getMemoryUsageBeforeGc().get("PS Eden Space").getMax());
                System.out.println("  Survivor Space:");
                System.out.println("    Initial Space: " + gcInfo.getMemoryUsageBeforeGc().get("PS Survivor Space").getInit());
                System.out.println("    Used Space: " + gcInfo.getMemoryUsageBeforeGc().get("PS Survivor Space").getUsed());
                System.out.println("    Committed Space: " + gcInfo.getMemoryUsageBeforeGc().get("PS Survivor Space").getCommitted());
                System.out.println("    Maximum Space: " + gcInfo.getMemoryUsageBeforeGc().get("PS Survivor Space").getMax());
                System.out.println("  Old Gen:");
                System.out.println("    Initial Space: " + gcInfo.getMemoryUsageBeforeGc().get("PS Old Gen").getInit());
                System.out.println("    Used Space: " + gcInfo.getMemoryUsageBeforeGc().get("PS Old Gen").getUsed());
                System.out.println("    Committed Space: " + gcInfo.getMemoryUsageBeforeGc().get("PS Old Gen").getCommitted());
                System.out.println("    Maximum Space: " + gcInfo.getMemoryUsageBeforeGc().get("PS Old Gen").getMax());
            }
        }
    }
}

这个代码会输出每个GC的名称以及其对应的伊甸区、幸存者区和老年代的初始空间、已使用空间、已分配空间、最大空间。