linux监控器，监控centos的cpu和内存使用情况

package LinuxMonitorUtils;   import java.io.BufferedReader; import java.io.FileInputStream; import java.io.InputStreamReader; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.StringTokenizer; import java.util.Timer; import java.util.TimerTask; import sendMailUtils.SendMail;   public class OSUtils { /**  * 功能：获取Linux系统cpu使用率  */ public static float cpuUsage() { try { Map<?, ?> map1 = OSUtils.cpuinfo(); Thread.sleep(5 * 1000); Map<?, ?> map2 = OSUtils.cpuinfo();   long user1 = Long.parseLong(map1.get("user").toString()); long nice1 = Long.parseLong(map1.get("nice").toString()); long system1 = Long.parseLong(map1.get("system").toString()); long idle1 = Long.parseLong(map1.get("idle").toString());   long user2 = Long.parseLong(map2.get("user").toString()); long nice2 = Long.parseLong(map2.get("nice").toString()); long system2 = Long.parseLong(map2.get("system").toString()); long idle2 = Long.parseLong(map2.get("idle").toString());   long total1 = user1 + system1 + nice1; long total2 = user2 + system2 + nice2; float total = total2 - total1;   long totalIdle1 = user1 + nice1 + system1 + idle1; long totalIdle2 = user2 + nice2 + system2 + idle2; float totalidle = totalIdle2 - totalIdle1;   float cpusage = (total / totalidle) * 100; System.out.println("cpu使用率:"+ cpusage+"%"); return cpusage; } catch (InterruptedException e) { e.printStackTrace(); } return 0; }   /**  * 功能：CPU使用信息  */ public static Map<?, ?> cpuinfo() { InputStreamReader inputs = null; BufferedReader buffer = null; Map<String, Object> map = new HashMap<String, Object>(); try { inputs = new InputStreamReader(new FileInputStream("/proc/stat")); buffer = new BufferedReader(inputs); String line = ""; while (true) { line = buffer.readLine(); if (line == null) { break; } if (line.startsWith("cpu")) { StringTokenizer tokenizer = new StringTokenizer(line); List<String> temp = new ArrayList<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(); } } return map; }   /**  * 功能：内存使用率  */ public static long memoryUsage() { Map<String, Object> map = new HashMap<String, Object>(); InputStreamReader inputs = null; BufferedReader buffer = null; try { inputs = new InputStreamReader(new FileInputStream("/proc/meminfo")); buffer = new BufferedReader(inputs); String line = ""; while (true) { line = buffer.readLine(); if (line == null) break; int beginIndex = 0; int endIndex = 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); } }   long memTotal = Long.parseLong(map.get("MemTotal").toString()); System.out.println("内存总量"+memTotal+"KB"); long memFree = Long.parseLong(map.get("MemFree").toString()); System.out.println("剩余内存"+memFree+"KB"); long memused = memTotal - memFree; System.out.println("已用内存"+memused+"KB"); long buffers = Long.parseLong(map.get("Buffers").toString()); long cached = Long.parseLong(map.get("Cached").toString());   double usage = (double) (memused - buffers - cached) / memTotal * 100; System.out.println("内存使用率"+usage+"%");   return memFree; } catch (Exception e) { e.printStackTrace(); } finally { try { buffer.close(); inputs.close(); } catch (Exception e2) { e2.printStackTrace(); } } return 0; }   /**  * 主入口  * @param args  */ public static void main(String[] args) { //                //1. 创建计时器类 //                Timer timer = new Timer(); //                //2. 创建任务类 //                TimerTask task = new TimerTask() { //                        @Override //                        public void run() { //cup使用率 float cpuUsage = cpuUsage(); if(cpuUsage > 10.0 ){ SendMail.sendMail("[email protected]", "服务器cpu使用率过高，请注意查看", "服务器提醒"); } //内存使用情况 long memoryUsage = memoryUsage(); if((memoryUsage/1024) < 100){ SendMail.sendMail("[email protected]","服务器内存剩余空间不足，请注意查看", "服务器提醒"); } System.out.println("-----------"); //                        } //                }; //                timer.schedule(task, 1000, 1000*10);   } }