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();     } }