Java中不引用第三方依赖，获取系统CPU、内存、硬盘的使用情况

蔚落 2024-04-17 05:45 21阅读 0赞

1.Windows系统

import com.sun.management.OperatingSystemMXBean;
    import java.io.File;
    import java.io.InputStreamReader;
    import java.io.LineNumberReader;
    import java.lang.management.ManagementFactory;
    import java.util.ArrayList;
    import java.util.List;
    
    /**
     * 获取系统CPU、内存、硬盘使用情况
     *
     * @author yanzy
     * @date 2019/1/15 16:52
     */
    public class WindowsCpuInternal {
    
        private static final int CPUTIME = 500;
    
        private static final int PERCENT = 100;
    
        private static final int FAULTLENGTH = 10;
    
        /**
         * 获取内存使用率
         *
         * @return java.lang.String
         * @author yanzy
         * @version 1.0
         * @date 2019/1/15 17:04
         */
        public static String getMemery() {
            // 获取操作系统属性
            OperatingSystemMXBean operatingSystemMXBean = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
            // 总的物理内存+虚拟内存
            long totalvirtualMemory = operatingSystemMXBean.getTotalSwapSpaceSize();
            // 剩余的物理内存
            long freePhysicalMemorySize = operatingSystemMXBean.getFreePhysicalMemorySize();
            Double compare = (Double) (1 - freePhysicalMemorySize * 1.0 / totalvirtualMemory) * 100;
            return "内存已使用:" + compare.intValue() + "%";
        }
    
        /**
         * 获取文件系统使用率
         *
         * @return java.util.List<java.lang.String>
         * @author yanzy
         * @version 1.0
         * @date 2019/1/15 17:05
         */
        public static List<String> getDisk() {
            // 操作系统
            List<String> list = new ArrayList<String>();
            for (char c = 'A'; c <= 'Z'; c++) {
                String dirName = c + ":/";
                File win = new File(dirName);
                if (win.exists()) {
                    long total = (long) win.getTotalSpace();
                    long free = (long) win.getFreeSpace();
                    Double compare = (Double) (1 - free * 1.0 / total) * 100;
                    String str = c + ":盘  已使用 " + compare.intValue() + "%";
                    list.add(str);
                }
            }
            return list;
        }
    
        /**
         * 获得cpu使用率
         *
         * @return java.lang.String
         * @author yanzy
         * @version 1.0
         * @date 2019/1/15 17:05
         */
        public static String getCpuRatioForWindows() {
            try {
                String procCmd = System.getenv("windir") + "\\system32\\wbem\\wmic.exe process get Caption,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) {
                    long idletime = c1[0] - c0[0];
                    long busytime = c1[1] - c0[1];
                    return "CPU使用率:" + Double.valueOf(PERCENT * (busytime) * 1.0 / (busytime + idletime)).intValue() + "%";
                } else {
                    return "CPU使用率:" + 0 + "%";
                }
            } catch (Exception ex) {
                ex.printStackTrace();
                return "CPU使用率:" + 0 + "%";
            }
        }
    
        /**
         * 读取cpu相关信息
         *
         * @return long[]
         * @author yanzy
         * @version 1.0
         * @date 2019/1/15 17:06
         */
        private static long[] readCpu(final Process proc) {
            long[] retn = new long[2];
            try {
                proc.getOutputStream().close();
                InputStreamReader ir = new InputStreamReader(proc.getInputStream());
                LineNumberReader input = new LineNumberReader(ir);
                String line = input.readLine();
                if (line == null || line.length() < FAULTLENGTH) {
                    return null;
                }
                int capidx = line.indexOf("Caption");
                int cmdidx = line.indexOf("CommandLine");
                int rocidx = line.indexOf("ReadOperationCount");
                int umtidx = line.indexOf("UserModeTime");
                int kmtidx = line.indexOf("KernelModeTime");
                int wocidx = line.indexOf("WriteOperationCount");
                long idletime = 0;
                long kneltime = 0;
                long usertime = 0;
                while ((line = input.readLine()) != null) {
                    if (line.length() < wocidx) {
                        continue;
                    }
                    // 字段出现顺序：Caption,CommandLine,KernelModeTime,ReadOperationCount,
                    // ThreadCount,UserModeTime,WriteOperation
                    String caption = substring(line, capidx, cmdidx - 1).trim();
                    String cmd = substring(line, cmdidx, kmtidx - 1).trim();
                    if (cmd.indexOf("wmic.exe") >= 0) {
                        continue;
                    }
                    String s1 = substring(line, kmtidx, rocidx - 1).trim();
                    String s2 = substring(line, umtidx, wocidx - 1).trim();
                    if (caption.equals("System Idle Process") || caption.equals("System")) {
                        if (s1.length() > 0)
                            idletime += Long.valueOf(s1).longValue();
                        if (s2.length() > 0)
                            idletime += Long.valueOf(s2).longValue();
                        continue;
                    }
                    if (s1.length() > 0)
                        kneltime += Long.valueOf(s1).longValue();
                    if (s2.length() > 0)
                        usertime += Long.valueOf(s2).longValue();
                }
                retn[0] = idletime;
                retn[1] = kneltime + usertime;
                return retn;
            } catch (Exception ex) {
                ex.printStackTrace();
            } finally {
                try {
                    proc.getInputStream().close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            return null;
        }
    
        /**
         * 由于String.subString对汉字处理存在问题（把一个汉字视为一个字节)，因此在 包含汉字的字符串时存在隐患，现调整如下：
         *
         * @param src       要截取的字符串
         * @param start_idx 开始坐标（包括该坐标)
         * @param end_idx   截止坐标（包括该坐标）
         * @return java.lang.String
         * @author yanzy
         * @version 1.0
         * @date 2019/1/15 17:08
         */
        private static String substring(String src, int start_idx, int end_idx) {
            byte[] b = src.getBytes();
            String tgt = "";
            for (int i = start_idx; i <= end_idx; i++) {
                tgt += (char) b[i];
            }
            return tgt;
        }
        
    }

2.Linux系统

import java.io.BufferedReader;
    import java.io.FileInputStream;
    import java.io.InputStreamReader;
    import java.math.BigDecimal;
    import java.util.*;
    
    /**
     * description
     *
     * @author yanzy
     * @date 2019/1/16 10:32
     */
    public class LinuxCpuInternal {
    
        /**
         * 获取磁盘使用率
         *
         * @return int
         * @author yanzy
         * @version 1.0
         * @date 2019/1/16 15:29
         */
        public static int getDiskUsage() throws Exception {
            double totalHD = 0;
            double usedHD = 0;
            Runtime rt = Runtime.getRuntime();
            // df -hl 查看硬盘空间
            Process p = rt.exec("df -hl");
            BufferedReader in = null;
            try {
                in = new BufferedReader(new InputStreamReader(p.getInputStream()));
                String str = null;
                String[] strArray = null;
                while ((str = in.readLine()) != null) {
                    int m = 0;
                    strArray = str.split(" ");
                    for (String tmp : strArray) {
                        if (tmp.trim().length() == 0)
                            continue;
                        ++m;
                        if (tmp.indexOf("G") != -1) {
                            if (m == 2) {
                                if (!tmp.equals("") && !tmp.equals("0"))
                                    totalHD += Double.parseDouble(tmp.substring(0, tmp.length() - 1)) * 1024;
                            }
                            if (m == 3) {
                                if (!tmp.equals("none") && !tmp.equals("0"))
                                    usedHD += Double.parseDouble(tmp.substring(0, tmp.length() - 1)) * 1024;
                            }
                        }
                        if (tmp.indexOf("M") != -1) {
                            if (m == 2) {
                                if (!tmp.equals("") && !tmp.equals("0"))
                                    totalHD += Double.parseDouble(tmp.substring(0, tmp.length() - 1));
                            }
                            if (m == 3) {
                                if (!tmp.equals("none") && !tmp.equals("0"))
                                    usedHD += Double.parseDouble(tmp.substring(0, tmp.length() - 1));
                            }
                        }
                    }
                }
            } catch (Exception e) {
                e.getStackTrace();
            } finally {
                in.close();
            }
            // 保留2位小数
            double precent = (usedHD / totalHD) * 100;
            BigDecimal b1 = new BigDecimal(precent);
            precent = b1.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
            return (int) precent;
        }
    
        /**
         * 获取cpu使用率
         *
         * @return int
         * @author yanzy
         * @version 1.0
         * @date 2019/1/16 15:31
         */
        public static int getCpuUsage() {
            try {
                Map<?, ?> map1 = LinuxCpuInternal.getCpuinfo();
                Thread.sleep(5 * 1000);
                Map<?, ?> map2 = LinuxCpuInternal.getCpuinfo();
    
                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;
        }
    
    
        /**
         * 获取CPU使用信息
         *
         * @return java.util.Map
         * @author yanzy
         * @version 1.0
         * @date 2019/1/16 15:31
         */
        public static Map<?, ?> getCpuinfo() {
            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;
        }
    
    
        /**
         * 获取内存使用率
         *
         * @return int
         * @author yanzy
         * @version 1.0
         * @date 2019/1/16 15:32
         */
        public static int getMemoryUsage() {
            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;
        }
    }