使用Java代码获取服务器性能信息及局域网内主机名

package com.amgkaka.performance;  /** */ /**  * 监视信息的JavaBean类.  * @author amg  * @version 1.0   * Creation date: 2008-4-25 - 上午10:37:00  */  public  class MonitorInfoBean {   /** */ /** 可使用内存. */    private  long totalMemory;      /** */ /** 剩余内存. */    private  long freeMemory;      /** */ /** 最大可使用内存. */    private  long maxMemory;      /** */ /** 操作系统. */    private String osName;      /** */ /** 总的物理内存. */    private  long totalMemorySize;      /** */ /** 剩余的物理内存. */    private  long freePhysicalMemorySize;      /** */ /** 已使用的物理内存. */    private  long usedMemory;      /** */ /** 线程总数. */    private  int totalThread;      /** */ /** cpu使用率. */    private  double cpuRatio;    public  long getFreeMemory() {     return freeMemory;   }    public  void setFreeMemory( long freeMemory) {     this .freeMemory = freeMemory;   }    public  long getFreePhysicalMemorySize() {     return freePhysicalMemorySize;   }    public  void setFreePhysicalMemorySize( long freePhysicalMemorySize) {     this .freePhysicalMemorySize = freePhysicalMemorySize;   }    public  long getMaxMemory() {     return maxMemory;   }    public  void setMaxMemory( long maxMemory) {     this .maxMemory = maxMemory;   }    public String getOsName() {     return osName;   }    public  void setOsName(String osName) {     this .osName = osName;   }    public  long getTotalMemory() {     return totalMemory;   }    public  void setTotalMemory( long totalMemory) {     this .totalMemory = totalMemory;   }    public  long getTotalMemorySize() {     return totalMemorySize;   }    public  void setTotalMemorySize( long totalMemorySize) {     this .totalMemorySize = totalMemorySize;   }    public  int getTotalThread() {     return totalThread;   }    public  void setTotalThread( int totalThread) {     this .totalThread = totalThread;   }    public  long getUsedMemory() {     return usedMemory;   }    public  void setUsedMemory( long usedMemory) {     this .usedMemory = usedMemory;   }    public  double getCpuRatio() {     return cpuRatio;   }    public  void setCpuRatio( double cpuRatio) {     this .cpuRatio = cpuRatio;   } } 

package com.amgkaka.performance;  /** */ /**  * 获取系统信息的业务逻辑类接口.  * @author amg * @version 1.0   * Creation date: 2008-3-11 - 上午10:06:06  */  public  interface IMonitorService {   /** */ /**    * 获得当前的监控对象.    * @return 返回构造好的监控对象    * @throws Exception    * @author amgkaka    * Creation date: 2008-4-25 - 上午10:45:08    */    public MonitorInfoBean getMonitorInfoBean() throws Exception;  } 

package com.amgkaka.performance;  import java.io.InputStreamReader; import java.io.LineNumberReader;  import sun.management.ManagementFactory;  import com.sun.management.OperatingSystemMXBean;  /** */ /**  * 获取系统信息的业务逻辑实现类.  * @author amg * @version 1.0 Creation date: 2008-3-11 - 上午10:06:06  */  public  class MonitorServiceImpl implements IMonitorService {   //可以设置长些，防止读到运行此次系统检查时的cpu占用率，就不准了    private  static  final  int CPUTIME = 5000 ;    private  static  final  int PERCENT = 100 ;    private  static  final  int FAULTLENGTH = 10 ;    /** */ /**    * 获得当前的监控对象.    * @return 返回构造好的监控对象    * @throws Exception    * @author amg   * Creation date: 2008-4-25 - 上午10:45:08    */    public MonitorInfoBean getMonitorInfoBean() throws Exception {     int kb = 1024 ;          // 可使用内存      long totalMemory = Runtime.getRuntime().totalMemory() / kb;     // 剩余内存      long freeMemory = Runtime.getRuntime().freeMemory() / kb;     // 最大可使用内存      long maxMemory = Runtime.getRuntime().maxMemory() / kb;      OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory         .getOperatingSystemMXBean();      // 操作系统      String osName = System.getProperty("os.name" );     // 总的物理内存      long totalMemorySize = osmxb.getTotalPhysicalMemorySize() / kb;     // 剩余的物理内存      long freePhysicalMemorySize = osmxb.getFreePhysicalMemorySize() / kb;     // 已使用的物理内存      long usedMemory = (osmxb.getTotalPhysicalMemorySize() - osmxb         .getFreePhysicalMemorySize())         / kb;      // 获得线程总数      ThreadGroup parentThread;     for (parentThread = Thread.currentThread().getThreadGroup(); parentThread         .getParent() != null ; parentThread = parentThread.getParent())       ;     int totalThread = parentThread.activeCount();      double cpuRatio = 0 ;     if (osName.toLowerCase().startsWith( "windows" )) {       cpuRatio = this .getCpuRatioForWindows();     }          // 构造返回对象      MonitorInfoBean infoBean = new MonitorInfoBean();     infoBean.setFreeMemory(freeMemory);     infoBean.setFreePhysicalMemorySize(freePhysicalMemorySize);     infoBean.setMaxMemory(maxMemory);     infoBean.setOsName(osName);     infoBean.setTotalMemory(totalMemory);     infoBean.setTotalMemorySize(totalMemorySize);     infoBean.setTotalThread(totalThread);     infoBean.setUsedMemory(usedMemory);     infoBean.setCpuRatio(cpuRatio);     return infoBean;   }    /** */ /**    * 获得CPU使用率.    * @return 返回cpu使用率    * @author amg   * Creation date: 2008-4-25 - 下午06:05:11    */    private  double getCpuRatioForWindows() {     try {       String procCmd = System.getenv("windir" )           + "//system32//wbem//wmic.exe process get Caption,CommandLine,"            + "KernelModeTime,ReadOperationCount,ThreadCount,UserModeTime,WriteOperationCount" ;       // 取进程信息        long [] c0 = readCpu(Runtime.getRuntime().exec(procCmd));       Thread.sleep(CPUTIME);       long [] c1 = readCpu(Runtime.getRuntime().exec(procCmd));       if (c0 != null && c1 != null ) {         long idletime = c1[ 0 ] - c0[ 0 ];         long busytime = c1[ 1 ] - c0[ 1 ];         return Double.valueOf(             PERCENT * (busytime) / (busytime + idletime))             .doubleValue();       } else {         return  0.0 ;       }     } catch (Exception ex) {       ex.printStackTrace();       return  0.0 ;     }   }    /** */ /**    * 读取CPU信息.    * @param proc    * @return    * @author amg   * Creation date: 2008-4-25 - 下午06:10:14    */    private  long [] readCpu( final Process proc) {     long [] retn = new  long [ 2 ];     try {       proc.getOutputStream().close();       InputStreamReader ir = new InputStreamReader(proc.getInputStream());       LineNumberReader input = new LineNumberReader(ir);       String line = input.readLine();       if (line == null || line.length() < FAULTLENGTH) {         return  null ;       }       int capidx = line.indexOf( "Caption" );       int cmdidx = line.indexOf( "CommandLine" );       int rocidx = line.indexOf( "ReadOperationCount" );       int umtidx = line.indexOf( "UserModeTime" );       int kmtidx = line.indexOf( "KernelModeTime" );       int wocidx = line.indexOf( "WriteOperationCount" );       long idletime = 0 ;       long kneltime = 0 ;       long usertime = 0 ;       while ((line = input.readLine()) != null ) {         if (line.length() < wocidx) {           continue ;         }         // 字段出现顺序：Caption,CommandLine,KernelModeTime,ReadOperationCount,          // ThreadCount,UserModeTime,WriteOperation          String caption = Bytes.substring(line, capidx, cmdidx - 1 )             .trim();         String cmd = Bytes.substring(line, cmdidx, kmtidx - 1 ).trim();         if (cmd.indexOf( "wmic.exe" ) >= 0 ) {           continue ;         }         // log.info("line="+line);          if (caption.equals( "System Idle Process" )             || caption.equals("System" )) {           idletime += Long.valueOf(               Bytes.substring(line, kmtidx, rocidx - 1 ).trim())               .longValue();           idletime += Long.valueOf(               Bytes.substring(line, umtidx, wocidx - 1 ).trim())               .longValue();           continue ;         }          kneltime += Long.valueOf(             Bytes.substring(line, kmtidx, rocidx - 1 ).trim())             .longValue();         usertime += Long.valueOf(             Bytes.substring(line, umtidx, wocidx - 1 ).trim())             .longValue();       }       retn[0 ] = idletime;       retn[1 ] = kneltime + usertime;       return retn;     } catch (Exception ex) {       ex.printStackTrace();     } finally {       try {         proc.getInputStream().close();       } catch (Exception e) {         e.printStackTrace();       }     }     return  null ;   }      /** */ /**    * 测试方法.    * @param args    * @throws Exception    * @author amg   * Creation date: 2008-4-30 - 下午04:47:29    */    public  static  void main(String[] args) throws Exception {     IMonitorService service = new MonitorServiceImpl();     MonitorInfoBean monitorInfo = service.getMonitorInfoBean();     System.out.println("cpu占有率=" + monitorInfo.getCpuRatio());          System.out.println("可使用内存=" + monitorInfo.getTotalMemory());     System.out.println("剩余内存=" + monitorInfo.getFreeMemory());     System.out.println("最大可使用内存=" + monitorInfo.getMaxMemory());          System.out.println("操作系统=" + monitorInfo.getOsName());     System.out.println("总的物理内存=" + monitorInfo.getTotalMemorySize() + "kb" );     System.out.println("剩余的物理内存=" + monitorInfo.getFreeMemory() + "kb" );     System.out.println("已使用的物理内存=" + monitorInfo.getUsedMemory() + "kb" );     System.out.println("线程总数=" + monitorInfo.getTotalThread() + "kb" );   } } 

package com.amgkaka.performance;  /** */ /**  * byte操作类.  * @author amg * @version 1.0   * Creation date: 2008-4-30 - 下午04:57:23  */  public  class Bytes {   /** */ /**    * 由于String.subString对汉字处理存在问题（把一个汉字视为一个字节)，因此在    * 包含汉字的字符串时存在隐患，现调整如下：    * @param src 要截取的字符串    * @param start_idx 开始坐标（包括该坐标)    * @param end_idx  截止坐标（包括该坐标）    * @return    */    public  static String substring(String src, int start_idx, int end_idx){     byte [] b = src.getBytes();     String tgt = "" ;     for ( int i=start_idx; i<=end_idx; i++){       tgt +=(char )b[i];     }     return tgt;   } } 

import java.net.InetAddress;import java.net.UnknownHostException;public class A {   static public void main(String[] args) {  try {   //通过主机名称得到IP地址  InetAddress address = InetAddress.getByName("192.168.9.148");  System.out.println("192.168.9.148"+": "+address.getHostAddress());//  通过IP得到主机名称  String ips="192.168.9.",ip;  InetAddress addip;    for(int i=148;i<255;i++){    ip=ips+i;      addip=InetAddress.getByName(ip);      System.out.println(ip+": "+addip.getHostName());       }          }  catch(UnknownHostException uhe) {  System.err.println("Unable to find: "+"192.168.9.148");  } }  }