<dependency> <groupId>org.fusesource</groupId> <artifactId>sigar</artifactId> <version>1.6.4</version> </dependency>
1、首先是Sigar中提供的DLL如何加载，可以通过设置其为CLASSPATH后，我们还可以通过程序来把只需要的DLL复制到默认的CLASSPATH路径下。
首先是通过参数的判断，是加载那种DLL，下面给出加载DLL的函数：
private static Logger logger = Logger.getLogger(ListenerMain.class);
public static void main(String[] args)
throws SigarException
{
try
{
logger.debug(System.getProperty("java.library.path"));
InputStream inputStream = new FileInputStream("../config/log4j.properties");
PropertyConfigurator.configure(inputStream);
if (null == args)
{
logger.error("请输入系统架构，例如Window 32位，则输入win32，win64，如果是Linux，则输入linux32,linux，目前只支持这2个系统");
return;
}
// String sys = args[0];
String sys = "win32";
if (null != args && args.length > 0)
{
sys = args[0];
}
String dllPath = "";
String dllName = "";
if ("win32".equals(sys))
{
dllPath = "/dll/sigar-x86-winnt.dll";
dllName = "sigar-x86-winnt.dll";
}
else if ("win64".equals(sys))
{
dllPath = "/dll/sigar-amd64-winnt.dll";
dllName = "sigar-amd64-winnt.dll";
}
else if ("linux32".equals(sys))
{
dllPath = "/dll/libsigar-x86-linux.so";
dllName = "libsigar-x86-linux.so";
}
else if (("linux64").equals(sys))
{
dllPath = "/dll/libsigar-amd64-linux.so";
dllName = "libsigar-amd64-linux.so";
}
if (dllPath.equals(""))
{
logger.error("输入的系统架构信息不正确，请重新输入");
return;
}
//设置DLL
setLibrary(dllPath,dllName);
}
catch (Exception e)
{
}
}
private static void setLibrary(String dllPath,String dllName)
{
try
{
// 获取到java.library.path
String libpath = System.getProperty("java.library.path");
if (libpath == null || libpath.length() == 0)
{
throw new RuntimeException("java.library.path is null");
}
String path = null;
StringTokenizer st = new StringTokenizer(libpath, System.getProperty("path.separator"));
if (st.hasMoreElements())
{
path = st.nextToken();
}
else
{
throw new RuntimeException("can not split library path:" + libpath);
}
// 把dll文件写入到java.library.path中该dll放在ConvertWord2HM相同目录下，这个可以是你的类名
InputStream inputStream = ListenerMain.class.getResource(dllPath).openStream();
final File dllFile = new File(new File(path), dllName);
if (!dllFile.exists())
{
FileOutputStream outputStream = new FileOutputStream(dllFile);
byte[] array = new byte[8192];
int bytesRead = -1;
while ((bytesRead = inputStream.read(array) )!= -1)
{
outputStream.write(array, 0, bytesRead);
}
outputStream.flush();
outputStream.close();
}
// 动态加载dll
System.load(dllFile.getPath());
// 在虚拟机关闭的时候删除dll
// dllFile.deleteOnExit();
}
catch (Throwable e)
{
logger.error("load dll error", e);
}
}
2、获取服务CPU、内存、硬盘的占用率
public double getDeviceCpuValue()
throws SigarException
{
double combined = 0f;
Sigar sigar = new Sigar();
// 方式二，不管是单块CPU还是多CPU都适用
CpuPerc cpuList[] = null;
cpuList = sigar.getCpuPercList();
for (int i = 0; i < cpuList.length; i++)
{
combined = combined + cpuList[i].getCombined();
}
logger.debug("device cpu = " + combined);
return combined / cpuList.length;
}
public float getDeviceMemValue()
throws SigarException
{
// a)物理内存信息
Sigar sigar = new Sigar();
Mem mem;
mem = sigar.getMem();
return (float)mem.getUsed() / (float)mem.getTotal();
}
public float getDeviceHdValue()
throws SigarException
{
float hdValue = 0f;
Sigar sigar = new Sigar();
FileSystem fslist[] = sigar.getFileSystemList();
float total = 0f;
float used = 0f;
for (int i = 0; i < fslist.length; i++)
{
FileSystem fs = fslist[i];
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 ：未知
break;
case 1: // TYPE_NONE
break;
case 2: // TYPE_LOCAL_DISK : 本地硬盘
// 文件系统总大小
total = total + usage.getTotal();
used = used + usage.getUsed();
break;
case 3:// TYPE_NETWORK ：网络
break;
case 4:// TYPE_RAM_DISK ：闪存
break;
case 5:// TYPE_CDROM ：光驱
break;
case 6:// TYPE_SWAP ：页面交换
break;
}
}
hdValue = used / total;
return hdValue;
}
3、Sigar不能正确获取某个进程的占用率，只能通过Shell脚本来实现，但是可以获取某个进程内存的使用率：
float memValue = (float)procMem.getResident() / (float)sigar.getMem().getTotal();
4、如何判断网卡是否正常使用，在Sigar并没有提供这样的方法，但是通过判断是否存在正常的IP，则说明
该网卡是否正常使用。
public Map<String, String> getNeWorkCards()
throws SigarException
{
Sigar sigar = null;
sigar = new Sigar();
String[] ifaces = sigar.getNetInterfaceList();
Map<String, String> map = new HashMap<String, String>();
for (int i = 0; i < ifaces.length; i++)
{
NetInterfaceConfig cfg = sigar.getNetInterfaceConfig(ifaces[i]);
if (NetFlags.LOOPBACK_ADDRESS.equals(cfg.getAddress())
|| NetFlags.LOOPBACK_ADDRESS_V6.equals(cfg.getAddress()))
{
continue;
}
if ((NetFlags.ANY_ADDR.equals(cfg.getAddress()) && NetFlags.ANY_ADDR.equals(cfg.getBroadcast()))
|| (NetFlags.ANY_ADDR_V6.equals(cfg.getAddress()) && NetFlags.ANY_ADDR_V6.equals(cfg.getBroadcast())))
{
map.put(ifaces[i], AlarmContants.ABNORMAL + "");
}
else
{
map.put(ifaces[i], AlarmContants.NORMAL + "");
}
}
return map;
}
5、在Window及Linux上，Sigar得到一些信息还是有很大区别的，一般来说，Window得到的信息更全些，
而Linux相对比较少，这就需要我们自己编写Shell脚本去获取一些需要的信息了。
6、Sigar不能获取硬件的信息