源码之家 网站模板,建设工程公司网站,linux下如何打开wordpress,网站建设设计服务(转#xff09;用Java获得当前性能信息 http://www.blogjava.net/amigoxie/archive/2008/04/30/197564.html在Java中#xff0c;可以获得总的物理内存、剩余的物理内存、已使用的物理内存等信息#xff0c;本例讲解如何取得这些信息#xff0c;并且获得在Windows下的内存使… (转用Java获得当前性能信息 http://www.blogjava.net/amigoxie/archive/2008/04/30/197564.html 在Java中可以获得总的物理内存、剩余的物理内存、已使用的物理内存等信息本例讲解如何取得这些信息并且获得在Windows下的内存使用率。 首先编写一个MonitorInfoBean类用来装载监控的一些信息包括物理内存、剩余的物理内存、已使用的物理内存、内存使用率等字段该类的代码如下package com.amigo.performance;/** *//** * 监视信息的JavaBean类. * author a hrefmailto:xiexingxing1121126.comAmigoXie/a * 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; }} 接着编写一个获得当前的监控信息的接口该类的代码如下所示package com.amigo.performance;/** *//** * 获取系统信息的业务逻辑类接口. * author a hrefmailto:xiexingxing1121126.comAmigoXie/a * 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 a hrefmailto:xiexingxing1121126.comAmigoXie/a * Creation date: 2008-4-25 - 上午10:45:08 */ public MonitorInfoBean getMonitorInfoBean() throws Exception;} 该类的实现类MonitorServiceImpl如下所示package com.amigo.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 a hrefmailto:xiexingxing1121126.comAmigoXie/a * version 1.0 Creation date: 2008-3-11 - 上午10:06:06 */public class MonitorServiceImpl implements IMonitorService { private static final int CPUTIME 30; 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 a hrefmailto:xiexingxing1121126.comAmigoXie/a * 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 a hrefmailto:xiexingxing1121126.comAmigoXie/a * 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 a hrefmailto:xiexingxing1121126.comAmigoXie/a * 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(lineline); 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 a hrefmailto:xiexingxing1121126.comAmigoXie/a * 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); }} 该实现类中需要用到一个自己编写byte的工具类该类的代码如下所示package com.amigo.performance;/** *//** * byte操作类. * author a hrefmailto:xiexingxing1121126.comAmigoXie/a * 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 istart_idx; iend_idx; i){ tgt (char)b[i]; } return tgt; }} 运行下MonitorBeanImpl类读者将会看到当前的内存、cpu利用率等信息。 posted on 2008-05-02 07:03 jackyrong的世界 阅读(...) 评论(...) 编辑 收藏 转载于:https://www.cnblogs.com/jackyrong/archive/2008/05/02/1179180.html
