package com.dy.common.util;

import lombok.Data;

import java.net.UnknownHostException;
import java.text.DecimalFormat;
import java.util.Properties;

/**
 * @Author: liurunyu
 * @Date: 2024/8/2 13:52
 * @Description
 */
public class SysJvmUtil {

    /**
Java虚拟机信息
     */
    public static JvmInfoVo info() throws UnknownHostException {
        JvmInfoVo vo = new JvmInfoVo() ;
        Properties props = System.getProperties();
        vo.setTotal(toMbytes(Runtime.getRuntime().totalMemory()));
        vo.setMax(toMbytes(Runtime.getRuntime().maxMemory()));
        vo.setFree(toMbytes(Runtime.getRuntime().freeMemory()));
        vo.setVersion(props.getProperty("java.version"));
        vo.setHome(props.getProperty("java.home"));
        return vo ;
    }

    private static double toMbytes(double value){
        return value/1000000.0 ;
    }

    @Data
    public static class JvmInfoVo {
        /**
    当前JVM占用的内存总数(M)
         */
        public double total;

        /**
    JVM最大可用内存总数(M)
         */
        public double max;

        /**
    JVM空闲内存(M)
         */
        public double free;

        /**
    JDK版本
         */
        public String version;

        /**
    JDK路径
         */
        public String home;


        public String toString(){
            DecimalFormat df = new DecimalFormat("#.####"); // 设定格式
            StringBuilder sb = new StringBuilder() ;
            sb.append("   JVM信息：\n");
            sb.append("      JVM最大可用内存总数(M)：" + df.format(max) + "\n");
            sb.append("      JVM占用的内存数(M)：" + df.format(total) + "\n");
            sb.append("      JVM空闲内存数(M)：" + df.format(free) + "\n");
            sb.append("      JDK版本：" + version + "\n");
            sb.append("      JDK路径：" + home + "\n");

            return sb.toString() ;
        }
    }



}