跨平台获取java进程id(Process ID in Java)

对于不同平台，获取java进程id有不同的方法，这个做一个总结，写一个工具类。

这个工具主要进行两种尝试来获得pid：

• 从 java.lang.management.RuntimeMXBean获得

• 从操作系统获得
  • windows系统
  • 非windows系统

工具代码：

/**
 * Process ID in Java
 *
 * @author lichengwu
 * @created 2012-1-18
 *
 * @version 1.0
 */
public
 
final
 
class
 PID {

    private
 
static
 
final
 Log log = LogFactory.getLog(PID.
class
);

    /**
     * 私有构造方法
     */
    private
 PID() {
        super
();
    }

    /**
     * 获得java进程id
     *
     * @author lichengwu
     * @created 2012-1-18
     *
     * @return java进程id
     */
    public
 
static
 
final
 String getPID() {
        String pid = System.getProperty("pid"
);
        if
 (pid == 
null
) {
            RuntimeMXBean runtimeMXBean = ManagementFactory.getRuntimeMXBean();
            String processName = runtimeMXBean.getName();
            if
 (processName.indexOf(
'@'
) != -
1
) {
                pid = processName.substring(0
, processName.indexOf(
'@'
));
            } else
 {
                pid = getPIDFromOS();
            }
            System.setProperty("pid"
, pid);
        }
        return
 pid;
    }

    /**
     * 从操作系统获得pid
     * <p>
     * 对于windows，请参考:http://www.scheibli.com/projects/getpids/index.html
     *
     * @author lichengwu
     * @created 2012-1-18
     *
     * @return
     */
    private
 
static
 String getPIDFromOS() {

        String pid = null
;

        String[] cmd = null
;

        File tempFile = null
;

        String osName = ParameterUtil.getParameter(Parameter.OS_NAME);
        // 处理windows
        if
 (osName.toLowerCase().contains(
"windows"
)) {
            FileInputStream fis = null
;
            FileOutputStream fos = null
;

            try
 {
                // 创建临时getpids.exe文件
                tempFile = File.createTempFile("getpids"
, 
".exe"
);
                File getpids = new
 File(ParameterUtil.getResourcePath(
"getpids.exe"
));
                fis = new
 FileInputStream(getpids);
                fos = new
 FileOutputStream(tempFile);
                byte
[] buf = 
new
 
byte
[
1024
];
                while
 (fis.read(buf) != -
1
) {
                    fos.write(buf);
                }
                // 获得临时getpids.exe文件路径作为命令
                cmd = new
 String[] { tempFile.getAbsolutePath() };
            } catch
 (FileNotFoundException e) {
                log.equals(e);
            } catch
 (IOException e) {
                log.equals(e);
            } finally
 {
                if
 (tempFile != 
null
) {
                    tempFile.deleteOnExit();
                }
                Closer.close(fis, fos);
            }
        }
        // 处理非windows
        else
 {
            cmd = new
 String[] { 
"/bin/sh"
, 
"-c"
, 
"echo $$ $PPID"
 };
        }
        InputStream is = null
;
        ByteArrayOutputStream baos = null
;
        try
 {
            byte
[] buf = 
new
 
byte
[
1024
];
            Process exec = Runtime.getRuntime().exec(cmd);
            is = exec.getInputStream();
            baos = new
 ByteArrayOutputStream();
            while
 (is.read(buf) != -
1
) {
                baos.write(buf);
            }
            String ppids = baos.toString();
            // 对于windows参考：http://www.scheibli.com/projects/getpids/index.html
            pid = ppids.split(" "
)[
1
];
        } catch
 (Exception e) {
            log.error(e);
        } finally
 {
            if
 (tempFile != 
null
) {
                tempFile.deleteOnExit();
            }
            Closer.close(is, baos);
        }
        return
 pid;
    }
}