자 바 는 CPU 사용률, 하드디스크 크기, 네트워크 카드 상태, 시스템 정보 등 을 포함 한 시스템 정 보 를 얻는다

import java.net.InetAddress;
import java.net.UnknownHostException;

import org.hyperic.sigar.CpuInfo;
import org.hyperic.sigar.CpuPerc;
import org.hyperic.sigar.FileSystem;
import org.hyperic.sigar.FileSystemUsage;
import org.hyperic.sigar.Mem;
import org.hyperic.sigar.NetFlags;
import org.hyperic.sigar.NetInterfaceConfig;
import org.hyperic.sigar.NetInterfaceStat;
import org.hyperic.sigar.OperatingSystem;
import org.hyperic.sigar.Sigar;
import org.hyperic.sigar.SigarException;
import org.hyperic.sigar.SigarNotImplementedException;
import org.hyperic.sigar.Swap;

public class SysInfo {
	// 1.CPU    
	// a)CPU  （  ： ）
	public static int getCpuCount() throws SigarException {
		Sigar sigar = new Sigar();
		try {
			return sigar.getCpuInfoList().length;
		} finally {
			sigar.close();
		}
	}

	// b)CPU   （  ：HZ） CPU     
	public void getCpuTotal() {
		Sigar sigar = new Sigar();
		CpuInfo[] infos;
		try {
			infos = sigar.getCpuInfoList();
			for (int i = 0; i < infos.length; i++) {//      CPU   CPU   
				CpuInfo info = infos[i];
				System.out.println("mhz=" + info.getMhz());// CPU   MHz
				System.out.println("vendor=" + info.getVendor());//   CPU   ， ：Intel
				System.out.println("model=" + info.getModel());//   CPU   ， ：Celeron
				System.out.println("cache size=" + info.getCacheSize());//        
			}
		} catch (SigarException e) {
			e.printStackTrace();
		}
	}

	// c)CPU      、       、     、        （  ：100%）
	public void testCpuPerc() {
		Sigar sigar = new Sigar();
		//    ，       CPU   
		CpuPerc cpu;
		try {
			cpu = sigar.getCpuPerc();
			printCpuPerc(cpu);
		} catch (SigarException e) {
			e.printStackTrace();
		}
		//    ，     CPU   CPU   
		CpuPerc cpuList[] = null;
		try {
			cpuList = sigar.getCpuPercList();
		} catch (SigarException e) {
			e.printStackTrace();
			return;
		}
		for (int i = 0; i < cpuList.length; i++) {
			printCpuPerc(cpuList[i]);
		}
	}

	private void printCpuPerc(CpuPerc cpu) {
		System.out.println("User :" + CpuPerc.format(cpu.getUser()));//      
		System.out.println("Sys :" + CpuPerc.format(cpu.getSys()));//      
		System.out.println("Wait :" + CpuPerc.format(cpu.getWait()));//      
		System.out.println("Nice :" + CpuPerc.format(cpu.getNice()));//
		System.out.println("Idle :" + CpuPerc.format(cpu.getIdle()));//      
		System.out.println("Total :" + CpuPerc.format(cpu.getCombined()));//      
	}

	// 2.      
	public void getPhysicalMemory() {
		// a)      
		Sigar sigar = new Sigar();
		Mem mem;
		try {
			mem = sigar.getMem();
			//     
			System.out.println("Total = " + mem.getTotal() / 1024L + "K av");
			//        
			System.out.println("Used = " + mem.getUsed() / 1024L + "K used");
			//        
			System.out.println("Free = " + mem.getFree() / 1024L + "K free");
			// b)           
			Swap swap = sigar.getSwap();
			//      
			System.out.println("Total = " + swap.getTotal() / 1024L + "K av");
			//         
			System.out.println("Used = " + swap.getUsed() / 1024L + "K used");
			//         
			System.out.println("Free = " + swap.getFree() / 1024L + "K free");
		} catch (SigarException e) {
			e.printStackTrace();
		}
	}

	// 3.      
	// a)           ：
	public String getPlatformName() {
		String hostname = "";
		try {
			hostname = InetAddress.getLocalHost().getHostName();
		} catch (Exception exc) {
			Sigar sigar = new Sigar();
			try {
				hostname = sigar.getNetInfo().getHostName();
			} catch (SigarException e) {
				hostname = "localhost.unknown";
			} finally {
				sigar.close();
			}
		}
		return hostname;
	}

	// b)          
	public void testGetOSInfo() {
		OperatingSystem OS = OperatingSystem.getInstance();
		//          ： 386、486、586 x86
		System.out.println("OS.getArch() = " + OS.getArch());
		System.out.println("OS.getCpuEndian() = " + OS.getCpuEndian());//
		System.out.println("OS.getDataModel() = " + OS.getDataModel());//
		//     
		System.out.println("OS.getDescription() = " + OS.getDescription());
		System.out.println("OS.getMachine() = " + OS.getMachine());//
		//       
		System.out.println("OS.getName() = " + OS.getName());
		System.out.println("OS.getPatchLevel() = " + OS.getPatchLevel());//
		//        
		System.out.println("OS.getVendor() = " + OS.getVendor());
		//     
		System.out.println("OS.getVendorCodeName() = " + OS.getVendorCodeName());
		//       
		System.out.println("OS.getVendorName() = " + OS.getVendorName());
		//         
		System.out.println("OS.getVendorVersion() = " + OS.getVendorVersion());
		//         
		System.out.println("OS.getVersion() = " + OS.getVersion());
	}

	// c)              
	public void testWho() {
		try {
			Sigar sigar = new Sigar();
			org.hyperic.sigar.Who[] who = sigar.getWhoList();
			if (who != null && who.length > 0) {
				for (int i = 0; i < who.length; i++) {
					System.out.println("
~~~~~~~~~" + String.valueOf(i) + "~~~~~~~~~");
					org.hyperic.sigar.Who _who = who[i];
					System.out.println("getDevice() = " + _who.getDevice());
					System.out.println("getHost() = " + _who.getHost());
					System.out.println("getTime() = " + _who.getTime());
					//             
					System.out.println("getUser() = " + _who.getUser());
				}
			}
		} catch (SigarException e) {
			e.printStackTrace();
		}
	}

	// 4.    （     ）
	// a)              （  sigar.getFileSystemList()   FileSystem    ，        ）：
	public void testFileSystemInfo() throws Exception {
		Sigar sigar = new Sigar();
		FileSystem fslist[] = sigar.getFileSystemList();
		// String dir = System.getProperty("user.home");//          
		for (int i = 0; i < fslist.length; i++) {
			System.out.println("
~~~~~~~~~~" + i + "~~~~~~~~~~");
			FileSystem fs = fslist[i];
			//        
			System.out.println("fs.getDevName() = " + fs.getDevName());
			//        
			System.out.println("fs.getDirName() = " + fs.getDirName());
			System.out.println("fs.getFlags() = " + fs.getFlags());//
			//       ，   FAT32、NTFS
			System.out.println("fs.getSysTypeName() = " + fs.getSysTypeName());
			//        ，      、  、       
			System.out.println("fs.getTypeName() = " + fs.getTypeName());
			//       
			System.out.println("fs.getType() = " + fs.getType());
			FileSystemUsage usage = null;
			try {
				usage = sigar.getFileSystemUsage(fs.getDirName());
			} catch (SigarException e) {
				if (fs.getType() == 2)
					throw e;
				continue;
			}
			switch (fs.getType()) {
			case 0: // TYPE_UNKNOWN ：  
				break;
			case 1: // TYPE_NONE
				break;
			case 2: // TYPE_LOCAL_DISK :     
				//        
				System.out.println(" Total = " + usage.getTotal() + "KB");
				//         
				System.out.println(" Free = " + usage.getFree() + "KB");
				//         
				System.out.println(" Avail = " + usage.getAvail() + "KB");
				//          
				System.out.println(" Used = " + usage.getUsed() + "KB");
				double usePercent = usage.getUsePercent() * 100D;
				//           
				System.out.println(" Usage = " + usePercent + "%");
				break;
			case 3:// TYPE_NETWORK ：  
				break;
			case 4:// TYPE_RAM_DISK ：  
				break;
			case 5:// TYPE_CDROM ：  
				break;
			case 6:// TYPE_SWAP ：    
				break;
			}
			System.out.println(" DiskReads = " + usage.getDiskReads());
			System.out.println(" DiskWrites = " + usage.getDiskWrites());
		}
		return;
	}

	// 5.    
	// a)         
	public String getFQDN() {
		Sigar sigar = null;
		try {
			return InetAddress.getLocalHost().getCanonicalHostName();
		} catch (UnknownHostException e) {
			try {
				sigar = new Sigar();
				return sigar.getFQDN();
			} catch (SigarException ex) {
				return null;
			} finally {
				sigar.close();
			}
		}
	}

	// b)       IP  
	public String getDefaultIpAddress() {
		String address = null;
		try {
			address = InetAddress.getLocalHost().getHostAddress();
			//              IP ，                 
			//      Sigar          
			if (!NetFlags.LOOPBACK_ADDRESS.equals(address)) {
				return address;
			}
		} catch (UnknownHostException e) {
			// hostname not in DNS or /etc/hosts
		}
		Sigar sigar = new Sigar();
		try {
			address = sigar.getNetInterfaceConfig().getAddress();
		} catch (SigarException e) {
			address = NetFlags.LOOPBACK_ADDRESS;
		} finally {
			sigar.close();
		}
		return address;
	}

	// c)       MAC  
	public String getMAC() {
		Sigar sigar = null;
		try {
			sigar = new Sigar();
			String[] ifaces = sigar.getNetInterfaceList();
			String hwaddr = null;
			for (int i = 0; i < ifaces.length; i++) {
				NetInterfaceConfig cfg = sigar.getNetInterfaceConfig(ifaces[i]);
				if (NetFlags.LOOPBACK_ADDRESS.equals(cfg.getAddress()) || (cfg.getFlags() & NetFlags.IFF_LOOPBACK) != 0
						|| NetFlags.NULL_HWADDR.equals(cfg.getHwaddr())) {
					continue;
				}
				/*
				 *                 ，          MAC  ，          （         ）                Collection
				 * ，   for        MAC  。
				 */
				hwaddr = cfg.getHwaddr();
				break;
			}
			return hwaddr != null ? hwaddr : null;
		} catch (Exception e) {
			return null;
		} finally {
			if (sigar != null)
				sigar.close();
		}
	}

	// d)         
	public void testNetIfList() throws Exception {
		Sigar sigar = new Sigar();
		String ifNames[] = sigar.getNetInterfaceList();
		for (int i = 0; i < ifNames.length; i++) {
			String name = ifNames[i];
			NetInterfaceConfig ifconfig = sigar.getNetInterfaceConfig(name);
			print("
name = " + name);//      
			print("Address = " + ifconfig.getAddress());// IP  
			print("Netmask = " + ifconfig.getNetmask());//     
			if ((ifconfig.getFlags() & 1L) <= 0L) {
				print("!IFF_UP...skipping getNetInterfaceStat");
				continue;
			}
			try {
				NetInterfaceStat ifstat = sigar.getNetInterfaceStat(name);
				print("RxPackets = " + ifstat.getRxPackets());//        
				print("TxPackets = " + ifstat.getTxPackets());//        
				print("RxBytes = " + ifstat.getRxBytes());//         
				print("TxBytes = " + ifstat.getTxBytes());//        
				print("RxErrors = " + ifstat.getRxErrors());//         
				print("TxErrors = " + ifstat.getTxErrors());//           
				print("RxDropped = " + ifstat.getRxDropped());//         
				print("TxDropped = " + ifstat.getTxDropped());//         
			} catch (SigarNotImplementedException e) {
			} catch (SigarException e) {
				print(e.getMessage());
			}
		}
	}

	void print(String msg) {
		System.out.println(msg);
	}

	// e)       
	public void getEthernetInfo() {
		Sigar sigar = null;
		try {
			sigar = new Sigar();
			String[] ifaces = sigar.getNetInterfaceList();
			for (int i = 0; i < ifaces.length; i++) {
				NetInterfaceConfig cfg = sigar.getNetInterfaceConfig(ifaces[i]);
				if (NetFlags.LOOPBACK_ADDRESS.equals(cfg.getAddress()) || (cfg.getFlags() & NetFlags.IFF_LOOPBACK) != 0
						|| NetFlags.NULL_HWADDR.equals(cfg.getHwaddr())) {
					continue;
				}
				System.out.println("cfg.getAddress() = " + cfg.getAddress());// IP  
				System.out.println("cfg.getBroadcast() = " + cfg.getBroadcast());//       
				System.out.println("cfg.getHwaddr() = " + cfg.getHwaddr());//   MAC  
				System.out.println("cfg.getNetmask() = " + cfg.getNetmask());//     
				System.out.println("cfg.getDescription() = " + cfg.getDescription());//       
				System.out.println("cfg.getType() = " + cfg.getType());//
				System.out.println("cfg.getDestination() = " + cfg.getDestination());
				System.out.println("cfg.getFlags() = " + cfg.getFlags());//
				System.out.println("cfg.getMetric() = " + cfg.getMetric());
				System.out.println("cfg.getMtu() = " + cfg.getMtu());
				System.out.println("cfg.getName() = " + cfg.getName());
				System.out.println();
			}
		} catch (Exception e) {
			System.out.println("Error while creating GUID" + e);
		} finally {
			if (sigar != null)
				sigar.close();
		}
	}

	public static void main(String[] arg) {
		try {
			SysInfo s = new SysInfo();
			s.getCpuTotal();
			s.getPhysicalMemory();
			s.testGetOSInfo();
			s.testWho();
			s.testFileSystemInfo();
			s.testNetIfList();
			s.getEthernetInfo();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}