如何在java中检索有用的系统信息？

// 获取系统属性
String osName = System.getProperty("os.name");
String osVersion = System.getProperty("os.version");
String javaVersion = System.getProperty("java.version");

// 获取Java运行时环境信息
Runtime runtime = Runtime.getRuntime();
long totalMemory = runtime.totalMemory();
long freeMemory = runtime.freeMemory();

// 获取系统时间
long currentTimeMillis = System.currentTimeMillis();
Date date = new Date(currentTimeMillis);

import com.sun.management.OperatingSystemMXBean;

OperatingSystemMXBean osMXBean = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
double systemCpuLoad = osMXBean.getSystemCpuLoad();
double processCpuLoad = osMXBean.getProcessCpuLoad();
long totalPhysicalMemorySize = osMXBean.getTotalPhysicalMemorySize();
long freePhysicalMemorySize = osMXBean.getFreePhysicalMemorySize();

Runtime runtime = Runtime.getRuntime();
int availableProcessors = runtime.availableProcessors();

import java.net.InetAddress;

InetAddress inetAddress = InetAddress.getLocalHost();
String hostName = inetAddress.getHostName();
String hostAddress = inetAddress.getHostAddress();

import java.io.File;

File file = new File(".");
long totalSpace = file.getTotalSpace();
long freeSpace = file.getFreeSpace();
long usableSpace = file.getUsableSpace();