Java gets stat for the specified process

  java

Read /proc/{pid}/stat

/**
     * Get CPU stat of specified process.
     * @param pid Process ID
     * @return null may be returned if some unexpected things happens
     */
    public static long[] getProcCpuStat(int pid) {
        String file = String.format(Locale.US, "/proc/%d/stat", pid);
        BufferedReader br = null;
        try {
            br = new BufferedReader(new FileReader(file));
            String line = null;
            while ((line = br.readLine()) != null) {
                String[] fields = line.split("\\s+");
                if (fields.length >= 15) {
                    long[] stat = new long[]{Long.parseLong(fields[13])/**utime**/,
                    Long.parseLong(fields[14]) /**stime***/};
                    return stat;
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            IOUtils.closeQuietly(br);
        }
        return null;
    }

Example

root@efb27a24edbb:/opt# cat /proc/464/stat
464 (pmwebd) S 1 1 1 34816 1 4210944 409 0 29 0 0 2 0 0 20 0 1 0 213582 100552704 1470 18446744073709551615 1 1 0 0 0 0 0 1 16390 0 0 0 17 5 0 0 2 0 0 0 0 0 0 0 0 0 0

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