Java gets Linux system CPU usage

Original: http://www.open-open.com/code/view/1426152165201

ImportJava.io.BufferedReader;ImportJava.io.FileInputStream;Importjava.io.IOException;ImportJava.io.InputStreamReader;Importjava.util.ArrayList;ImportJava.util.HashMap;Importjava.util.List;ImportJava.util.Map;ImportJava.util.StringTokenizer;Importorg.apache.commons.io.FileSystemUtils; Public classOsutils {/*** Function: Available disk **/     Public Static intdisk () {Try {            LongTotal = filesystemutils.freespacekb ("/Home"); DoubleDisk = (Double) total/1024/1024; return(int) disk; } Catch(IOException e) {e.printstacktrace (); }        return0; }    /*** Function: Get CPU utilization of Linux system **/     Public Static intCPUUsage () {Try{Map<?,? > MAP1 =Osutils.cpuinfo (); Thread.Sleep (5 * 1000); Map<?,? > MAP2 =Osutils.cpuinfo (); LongUser1 = Long.parselong (Map1.get ("User"). toString ()); LongNice1 = Long.parselong (Map1.get ("nice"). toString ()); LongSystem1 = Long.parselong (Map1.get ("System"). toString ()); LongIdle1 = Long.parselong (Map1.get ("Idle"). toString ()); LongUser2 = Long.parselong (Map2.get ("User"). toString ()); LongNice2 = Long.parselong (Map2.get ("nice"). toString ()); LongSYSTEM2 = Long.parselong (Map2.get ("System"). toString ()); LongIdle2 = Long.parselong (Map2.get ("Idle"). toString ()); LongTotal1 = user1 + system1 +Nice1; LongTotal2 = user2 + system2 +Nice2; floatTotal = Total2-Total1; LongTotalIdle1 = user1 + Nice1 + system1 +Idle1; LongTotalIdle2 = user2 + nice2 + system2 +Idle2; floatTotalidle = TotalIdle2-TotalIdle1; floatCpusage = (total/totalidle) * 100; return(int) Cpusage; } Catch(interruptedexception e) {e.printstacktrace (); }        return0; }    /*** Function: CPU usage information **/     Public Staticmap<?,? >Cpuinfo () {InputStreamReader inputs=NULL; BufferedReader Buffer=NULL; Map<string, object> map =NewHashmap<string, object>(); Try{Inputs=NewInputStreamReader (NewFileInputStream ("/proc/stat")); Buffer=NewBufferedReader (inputs); String Line= "";  while(true) { line=Buffer.readline (); if(line = =NULL) {                     Break; }                if(Line.startswith ("CPU") {StringTokenizer Tokenizer=NewStringTokenizer (line); List<String> temp =NewArraylist<string>();  while(Tokenizer.hasmoreelements ()) {String value=Tokenizer.nexttoken ();                    Temp.add (value); } map.put ("User", Temp.get (1)); Map.put ("Nice", Temp.get (2)); Map.put ("System", Temp.get (3)); Map.put ("Idle", Temp.get (4)); Map.put ("Iowait", Temp.get (5)); Map.put ("IRQ", Temp.get (6)); Map.put ("Softirq", Temp.get (7)); Map.put ("Stealstolen", Temp.get (8));  Break; }            }        } Catch(Exception e) {e.printstacktrace (); } finally {            Try{buffer.close ();            Inputs.close (); } Catch(Exception E2) {e2.printstacktrace (); }        }        returnmap; }    /*** Function: Memory utilization **/     Public Static intMemoryusage () {Map<string, object> map =NewHashmap<string, object>(); InputStreamReader Inputs=NULL; BufferedReader Buffer=NULL; Try{Inputs=NewInputStreamReader (NewFileInputStream ("/proc/meminfo")); Buffer=NewBufferedReader (inputs); String Line= "";  while(true) { line=Buffer.readline (); if(line = =NULL)                     Break; intBeginindex = 0; intEndIndex = Line.indexof (":"); if(EndIndex! =-1) {String key=line.substring (Beginindex, EndIndex); Beginindex= EndIndex + 1; EndIndex=line.length (); String Memory=line.substring (Beginindex, EndIndex); String value= Memory.replace ("KB", "" "). Trim ();                Map.put (key, value); }            }            LongMemtotal = Long.parselong (Map.get ("Memtotal"). toString ()); LongMemfree = Long.parselong (Map.get ("Memfree"). toString ()); Longmemused = Memtotal-Memfree; Longbuffers = Long.parselong (Map.get ("Buffers"). toString ()); Longcached = Long.parselong (Map.get ("Cached"). toString ()); DoubleUsage = (Double) (memused-buffers-cached)/memtotal * 100; return(int) usage; } Catch(Exception e) {e.printstacktrace (); } finally {            Try{buffer.close ();            Inputs.close (); } Catch(Exception E2) {e2.printstacktrace (); }        }        return0; }}

Java gets Linux system CPU usage