用java获取CPU占用率

用java获取CPU占用率废话不说，代码如下：Bytes.java引用：ClassBytes(publicstaticStringsubstring(Stringsrc,intstart_idx,intend_idx){byte[]b=src.getBytes();Stringtgt=〃〃；for(inti二start_idx;i<=end_idx;i++){tgt+=(char)b;}returntgt;}}MonitorInfoBean.java引用：PublicclassMonitorInfoBean{/**线程总数*/privateinttotalThread;/**cpu使用率*/privatedoublecpuRatio;publicintgetTotalThread(){returntotalThread;}publicvoidsetTotalThreadinttotalThread){this.totalThread二totalThread;}publicdoublgetCpuRatio(){returncpuRatio;}publicvoisetCpuRatiodoublecpuRatio){this.cpuRati。二cpuRatio;}}CPU.java引用：importjava.io.BufferedReader;importjava.io.IOException;importjava.io.InputStream;importjava.io.InputStreamReader;importjava.io.LineNumberReader;importjava.util.StringTokenizer;PublicclassCPU{privatestaticfinalintCPUTIME=30;privatestaticfinalintPERCENT=100;privatestaticfinalintFAULTLENGTH=10;privatestaticStringlinuxVersionnull;publicdoublegetCpuRatio(){//操作系统StringosName二System.getProperty(〃〃)；doublecpuRati。=0;if(osName.toLowerCase().startsWith(〃windows〃)){cpuRati。二this.getCpuRatioForWindows();}else{cpuRati。二this.getCpuRateForLinux();}returncpuRatio;}/***获得当前的监控对象**@return返回构造好的监控对象*/publicMonitorInfoBeangetMonitorInfoBeanthrowsException{//操作系统StringosName二System.getProperty(〃〃)；//获得线程总数ThreadGroupparentThreadfor(parentThread二Thread.currentThread().getThreadGroup();parentThread.getParent()!null;parentThread二parentThread.getParent());inttotalThread二parentThread.activeCount();doublecpuRati。=0;if(osName.toLowerCase().startsWith(〃windows〃)){cpuRati。二this.getCpuRatioForWindows();}else{cpuRati。二this.getCpuRateForLinux();}//构造返回对象MonitorInfoBeaninfoBeannewMonitorInfoBean();infoBean.setTotalThread(totalThread);infoBean.setCpuRatio(cpuRatio);returninfoBean;}privatestaticdoublgetCpuRateForLinux(){InputStreamisnull;InputStreamReaderisrnull;BufferedReaderbrStatnull;StringTokenizertokenStatnull;try{System.out.println(〃GetusagerateofCUP,linuxversion:〃+linuxVersion);Processprocess二Runtime.getRuntime().exec(〃top-b-n1〃)；is二process.getInputStream();isr二newInputStreamReader(is);brStat二newBufferedReader(isr);if(linuxVersion.equals(〃2.4〃)){brStat.readLine();brStat.readLine();brStat.readLine();brStat.readLine();tokenStatnewStringTokenizer(brStat.readLine());tokenStat.nextToken();tokenStat.nextToken();Stringuser二tokenStat.nextToken();tokenStat.nextToken();Stringsystem二tokenStat.nextToken();tokenStat.nextToken();Stringnice二tokenStat.nextToken();System.out.println(user+〃，〃+system+〃，〃+nice);user二user.substring(0,user.indexOf(〃％〃))；system二system.substring(0,system.indexOf(〃％〃))；nice二nice.substring(0,nice.indexOf(〃％〃))；floatuserUsagenewFloat(user).floatValue();floatsystemUsagenewFloat(system).floatValue();floatniceUsagenewFloat(nice).floatValue();return(userUsage+systemUsage+niceUsage)/100;}else{brStat.readLine();brStat.readLine();tokenStatnewStringTokenizer(brStat.readLine());tokenStat.nextToken();tokenStat.nextToken();tokenStat.nextToken();tokenStat.nextToken();tokenStat.nextToken();tokenStat.nextToken();tokenStat.nextToken();StringcpuUsage二tokenStat.nextToken();System.out.println(〃CPUidle:〃+cpuUsage);FloatusagenewFloat(cpuUsage.substring(0,cpuUsage.indexOf(〃％〃)))；return(1-usage.floatValue()/100);}}catch(IOExceptionioe){System.out.println(ioe.getMessage());freeResource(is,isr,brStat);return1;}finally{freeResource(is,isr,brStat);}}privatestaticvoifreeResource(InputStreamis,InputStreamReaderisr,BufferedReaderbr){try{if(is!=null)is.close();if(isr!二null)isr.close();if(br!=null)br.close();}catch(IOExceptionioe){System.out.println(ioe.getMessage());}}/***获得CPU使用率**@return返回cpu使用率*/privatedoublegetCpuRatioForWindows(){try{StringprocCmd二System.getenv(〃windir〃)+〃\\system32\\wbem\\wmic.exeprocessgetCaption,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){longidletime=c1[0]-c0[0];longbusytime=c1[1]-c0[1];returnDouble.valueOf(PERCENT*(busytime)/(busytime+idletime)).doubleValue();}else{return0.0;}}catch(Exceptionex){ex.printStackTrace();return0.0;}}/****读取CPU信息**@paramproc*/privatelon[]readCpufinalProcessproc){long[]retn=newlong[2];try{proc.getOutputStream().close();InputStreamReaderirnewInputStreamReader(proc.getInputStream());LineNumberReaderinputnewLineNumberReader(ir);Stringline二input.readLine();if(line==)ull||line.length()<FAULTLENGTH){returnnull;}intcapidx二line.indexOf(〃Caption〃)；intcmdidx二line.indexOf(〃CommandLine〃)；introcidx二line.indexOf(〃ReadOperationCount〃)；intumtidx二line.indexOf(〃UserModeTime〃)；intkmtidx二line.indexOf(〃KernelModeTime〃)；intwocidx二line.indexOf(〃WriteOperationCount〃)；longidletime=0;longkneltime=0;longusertime=0;while((line二input.readLine())!null){if(line.length()<wocidx){continue;}Stringcaption二Bytes.substring(line,capidx,cmdidx-1).trim();Stringcmd二Bytes.substring(line,cmdidx,kmtidx-1).trim();if(cmd.indexOf(〃wmic.exe〃)>=0){continue;}if(caption.equals(〃SystemIdleProcess〃)||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;returnretn;}catch(Exceptionex){ex.printStac