Java获取Linux系统cpu使用率详解编程语言

long total = FileSystemUtils.freeSpaceKb("/home"); double disk = (double) total / 1024 / 1024; return (int) disk; } catch (IOException e) { e.printStackTrace(); return 0; /** * 功能：获取Linux系统cpu使用率 * */ public static int 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; return (int) 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 int 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()); long memFree = Long.parseLong(map.get("MemFree").toString()); long memused = memTotal - memFree; long buffers = Long.parseLong(map.get("Buffers").toString()); long cached = Long.parseLong(map.get("Cached").toString()); double usage = (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(); return 0; }

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