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Hutool是一个小而全的Java工具类库,通过静态方法封装,降低相关API的学习成本,提高工作效率,使Java拥有函数式语言般的优雅,让Java语言也可以“甜甜的”。

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package cn.hutool.core.lang;

import cn.hutool.core.exceptions.UtilException;
import cn.hutool.core.util.StrUtil;

import java.lang.management.ManagementFactory;

/**
 * 进程ID单例封装
* 第一次访问时调用{@link ManagementFactory#getRuntimeMXBean()}获取PID信息,之后直接使用缓存值 * * @author looly * @since 5.8.0 */ public enum Pid { INSTANCE; private final int pid; Pid() { this.pid = getPid(); } /** * 获取PID值 * * @return pid */ public int get() { return this.pid; } /** * 获取当前进程ID,首先获取进程名称,读取@前的ID值,如果不存在,则读取进程名的hash值 * * @return 进程ID * @throws UtilException 进程名称为空 */ private static int getPid() throws UtilException { final String processName = ManagementFactory.getRuntimeMXBean().getName(); if (StrUtil.isBlank(processName)) { throw new UtilException("Process name is blank!"); } final int atIndex = processName.indexOf('@'); if (atIndex > 0) { return Integer.parseInt(processName.substring(0, atIndex)); } else { return processName.hashCode(); } } }




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