java得到当前系统的概况

import java.io.BufferedReader; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.net.InetAddress; 
import java.net.NetworkInterface; 
import java.util.ArrayList; 
import java.util.Formatter; 
import java.util.List; 
import java.util.Locale; 
import java.util.Map; 
import java.util.Properties; 

public class SystemUtil { 

     //通过截取cmd流方式得到计算机的配置信息(不好)  
    public static List<String> getIpAddress(){ 
        Process p = null; 
        List<String> address  = new ArrayList<String>(); 
        try{ 
            p = new ProcessBuilder("ipconfig","/all").start(); 
        }catch(Exception e){ 
            return address; 
        } 
        StringBuffer sb = new StringBuffer(); 
        //读取进程输出值  
        InputStream inputStream = p.getInputStream(); 
        BufferedReader br = new BufferedReader(new InputStreamReader(inputStream)); 
        String s = ""; 
        try{ 
            while((s=br.readLine())!=null){ 
                sb.append(s+"\n"); 
            } 
        }catch(Exception e){ 
            e.printStackTrace(); 
        }finally{ 
            try{ 
                inputStream.close(); 
            }catch(Exception e){ 
                e.printStackTrace(); 
            } 
        } 
        System.out.println(sb); 
        return address; 
    } 

    public static void getIpconfig(){ 
        Map<String,String> map = System.getenv(); 
        System.out.println(map.get("USERNAME"));//获取用户名  
        System.out.println(map.get("COMPUTERNAME"));//获取计算机名  
        System.out.println(map.get("USERDOMAIN"));//获取计算机域名  
    } 
    //得到计算机的ip地址和mac地址  
    public static void getConfig(){ 
        try{ 
            InetAddress address = InetAddress.getLocalHost(); 
            NetworkInterface ni = NetworkInterface.getByInetAddress(address); 
            //ni.getInetAddresses().nextElement().getAddress();  
            byte[] mac = ni.getHardwareAddress(); 
            String sIP = address.getHostAddress(); 
            String sMAC = ""; 
            Formatter formatter = new Formatter(); 
            for (int i = 0; i < mac.length; i++) { 
                sMAC = formatter.format(Locale.getDefault(), "%02X%s", mac[i], 
                        (i < mac.length - 1) ? "-" : "").toString(); 

            } 
            System.out.println("IP：" + sIP); 
            System.out.println("MAC：" + sMAC); 
        }catch(Exception e){ 
            e.printStackTrace(); 
        } 
    } 
    //得到计算机的ip,名称,操作系统名称,操作系统版本  
    public static void Config(){ 
        try{ 
            InetAddress addr = InetAddress.getLocalHost();  
            String ip=addr.getHostAddress().toString(); //获取本机ip  
            String hostName=addr.getHostName().toString(); //获取本机计算机名称  
            System.out.println("本机IP："+ip+"\n本机名称:"+hostName); 
            Properties props=System.getProperties(); 
            System.out.println("操作系统的名称："+props.getProperty("os.name")); 
            System.out.println("操作系统的版本："+props.getProperty("os.version"));  
        }catch(Exception e){ 
            e.printStackTrace(); 
        } 
    } 

    //java环境  
    public static void all(){ 
        Properties props=System.getProperties(); 
        System.out.println("Java的运行环境版本："+props.getProperty("java.version")); 
        System.out.println("Java的运行环境供应商："+props.getProperty("java.vendor")); 
        System.out.println("Java供应商的URL："+props.getProperty("java.vendor.url")); 
        System.out.println("Java的安装路径："+props.getProperty("java.home")); 
        System.out.println("Java的虚拟机规范版本："+props.getProperty("java.vm.specification.version")); 
        System.out.println("Java的虚拟机规范供应商："+props.getProperty("java.vm.specification.vendor")); 
        System.out.println("Java的虚拟机规范名称："+props.getProperty("java.vm.specification.name")); 
        System.out.println("Java的虚拟机实现版本："+props.getProperty("java.vm.version")); 
        System.out.println("Java的虚拟机实现供应商："+props.getProperty("java.vm.vendor")); 
        System.out.println("Java的虚拟机实现名称："+props.getProperty("java.vm.name")); 
        System.out.println("Java运行时环境规范版本："+props.getProperty("java.specification.version")); 
        System.out.println("Java运行时环境规范供应商："+props.getProperty("java.specification.vender")); 
        System.out.println("Java运行时环境规范名称："+props.getProperty("java.specification.name")); 
        System.out.println("Java的类格式版本号："+props.getProperty("java.class.version")); 
        System.out.println("Java的类路径："+props.getProperty("java.class.path")); 
        System.out.println("加载库时搜索的路径列表："+props.getProperty("java.library.path")); 
        System.out.println("默认的临时文件路径："+props.getProperty("java.io.tmpdir")); 
        System.out.println("一个或多个扩展目录的路径："+props.getProperty("java.ext.dirs")); 
        System.out.println("操作系统的名称："+props.getProperty("os.name")); 
        System.out.println("操作系统的构架："+props.getProperty("os.arch")); 
        System.out.println("操作系统的版本："+props.getProperty("os.version")); 
        System.out.println("文件分隔符："+props.getProperty("file.separator"));//在 unix 系统中是＂／＂ System.out.println("路径分隔符："+props.getProperty("path.separator"));//在 unix 系统中是＂:＂ System.out.println("行分隔符："+props.getProperty("line.separator"));//在 unix 系统中是＂/n＂ System.out.println("用户的账户名称："+props.getProperty("user.name"));  
        System.out.println("用户的主目录："+props.getProperty("user.home")); 
        System.out.println("用户的当前工作目录："+props.getProperty("user.dir")); 
    } 
    public static void main(String[] args) { 
     Config();
     getConfig();
//        all(); 
    } 
}