Java obtains information about JVM memory and physical memory.

Java obtains information about JVM memory and physical memory.

1 package com. sysinfo; 2 public class MonitorInfo {3/** jvm memory available. */4 private long totalMemory; 5 6/** jvm memory remaining. */7 private long freeMemory; 8 9/** maximum memory available for jvm. */10 private long maxMemory; 11 12/** operating system. */13 private String osName; 14 15/** total physical memory. */16 private long totalMemorySize; 17 18/** remaining physical memory. */19 private long freeMemorySize; 20 21/** used physical memory. */22 private long usedMemorySize; 23 24/** Number of cores. */25 private int processors; 26 27 public long getTotalMemory () {28 return totalMemory; 29} 30 31 public void setTotalMemory (long totalMemory) {32 this. totalMemory = totalMemory; 33} 34 35 public long getFreeMemory () {36 return freeMemory; 37} 38 39 public void setFreeMemory (long freeMemory) {40 this. freeMemory = freeMemory; 41} 42 43 public long getMaxMemory () {44 return maxMemory; 45} 46 47 public void setMaxMemory (long maxMemory) {48 this. maxMemory = maxMemory; 49} 50 51 public String getOsName () {52 return osName; 53} 54 55 public void setOsName (String osName) {56 this. osName = osName; 57} 58 59 public long getTotalMemorySize () {60 return totalMemorySize; 61} 62 63 public void setTotalMemorySize (long totalMemorySize) {64 this. totalMemorySize = totalMemorySize; 65} 66 67 public long getFreeMemorySize () {68 return freeMemorySize; 69} 70 71 public void setfreemorysize (long freemorysize) {72 this. freeMemorySize = freeMemorySize; 73} 74 75 public long getUsedMemorySize () {76 return usedMemorySize; 77} 78 79 public void setUsedMemorySize (long usedMemorySize) {80 this. usedMemorySize = usedMemorySize; 81} 82 83 public int getProcessors () {84 return processors; 85} 86 87 public void setProcessors (int processors) {88 this. processors = processors; 89} 90}

1 package com. sysinfo; 2 3 import java. lang. management. managementFactory; 4 import java. math. bigDecimal; 5 6 import com. sun. management. operatingSystemMXBean; 7 8 public class MonitorService {9 public MonitorInfo getMonitorInfoBean () throws Exception {10 double mb = 1024*1024*1.0; 11 double gb = 1024*1024*1024*1.0; 12 13 // jvm14 double totalMemory = Runtime. getRuntime (). totalMemory ()/mb; 15 double freemory = Runtime. getRuntime (). freeMemory ()/mb; 16 double maxMemory = Runtime. getRuntime (). maxMemory ()/mb; 17 // os18 OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory19. getOperatingSystemMXBean (); 20 String osName = System. getProperty ("OS. name "); 21 double totalMemorySize = osmxb. getTotalPhysicalMemorySize ()/gb; 22 double freeMemorySize = osmxb. getFreePhysicalMemorySize ()/gb; 23 double usedMemorySize = (osmxb. getTotalPhysicalMemorySize ()-osmxb24. getFreePhysicalMemorySize ()/gb; 25 // MonitorInfo26 MonitorInfo infoBean = new MonitorInfo (); 27 infoBean. setTotalMemory (getIntValue (totalMemory); 28 infoBean. setFreeMemory (getIntValue (freeMemory); 29 infoBean. setMaxMemory (getIntValue (maxMemory); 30 infoBean. setOsName (osName); 31 infoBean. setTotalMemorySize (getIntValue (totalMemorySize); 32 infoBean. setFreeMemorySize (getIntValue (freemorysize); 33 infoBean. setUsedMemorySize (getIntValue (usedMemorySize); 34 infoBean. setProcessors (Runtime. getRuntime (). availableProcessors (); 35 return infoBean; 36} 37 38/** 39 * Rounded to 40*41 * @ param d42 * @ return43 */44 private static int getIntValue (double d) {45 return new BigDecimal (d ). setScale (0, BigDecimal. ROUND_HALF_UP) 46. intValue (); 47} 48 49 public static void main (String [] args) throws Exception {50 MonitorService service = new MonitorService (); 51 MonitorInfo monitorInfo = service. getMonitorInfoBean (); 52 // System. out. println ("JVM memory available =" + monitorInfo. getTotalMemory () + 53 // "MB"); 54 // System. out. println ("JVM memory remaining =" + monitorInfo. getFreeMemory () + "MB"); 55 // System. out. println ("JVM maximum memory available =" + monitorInfo. getMaxMemory () + 56 // "MB"); 57 58 System. out. println ("Operating System =" + monitorInfo. getOsName (); 59 System. out. println ("Number of cores =" + monitorInfo. getProcessors (); 60 System. out. println ("total physical memory =" + monitorInfo. getTotalMemorySize () + "GB"); 61 System. out. println ("remaining physical memory =" + monitorInfo. getFreeMemorySize () + "GB"); 62 System. out63. println ("used physical memory =" + monitorInfo. getUsedMemorySize () + "GB"); 64} 65}