系统时间修改方法

系统时间修改方法

java 修改系统时间方法

第一种方法：

需下载 jna.jar                           

a) 创建 Kernel32 接口

package  time.test;

import  com.sun.jna.Native;
import  com.sun.jna.Structure;
import  com.sun.jna.win32.StdCallLibrary;

public   interface  Kernel32  extends  StdCallLibrary
{
    Kernel32 INSTANCE  =  (Kernel32)Native.loadLibrary( " kernel32 " , Kernel32. class );
     public  SYSTEMTIME GetSystemTime();

     public   void  SetLocalTime(SYSTEMTIME localTime);

     public   static   class  SYSTEMTIME  extends  Structure
     {
     // 必须有这么多个字段,按这个顺序定义属性
           public   short  wYear;
         public   short  wMonth;
             public short wDayOfWeek;
         public   short  wDay;
         public   short  wHour;
         public   short  wMinute;
         public   short  wSecond;
         public   short  wMilliseconds;
            }
}

b) 修改时间

 

import  time.test.Kernel32.SYSTEMTIME;


public   class  SysTimeSettingDaoImp
{
     protected   void  setLocalTime(String time)
     {
       // time时间格式是14位的字符串，如"20080108152130"
        Short year  =  Short.parseShort(time.substring( 0 ,  4 ));
        Short month  =  Short.parseShort(time.substring( 4 ,  6 ));
        Short day  =  Short.parseShort(time.substring( 6 ,  8 ));
        Short hour  =  Short.parseShort(time.substring( 8 ,  10 ));
        Short minute  =  Short.parseShort(time.substring( 10 ,  12 ));
        Short second  =  Short.parseShort(time.substring( 12 ,  14 ));

        SYSTEMTIME ss  =   new  SYSTEMTIME();
        ss.setWYear(year);
        ss.setWMonth(month);
        ss.setWDay(day);
        ss.setWHour(hour);
        ss.setWMinute(minute);
        ss.setWSecond(second);

        Kernel32 lib  =  Kernel32.INSTANCE;
        lib.SetLocalTime(ss);
    }
}

第二种方法

 

public   class  MyTimeClass
{
             // timeAndDate格式位14位的字符串表示形式。
             public   void  setLocalTime(String timeAndDate)
             {
                            String date  =  getDate(timeAndDate);
                            String time  =  getTime(timeAndDate);
            
                             //  修改系统日期和时间
                            Runtime.getRuntime().exec( " cmd /c date  "   +  date);
                            Runtime.getRuntime().exec( " cmd /c time  "   +  time);
            }
             public  String getDate(String timeAndDate)
             {
                    String year  =  timeAndDate.substring( 0 ,  4 );
                    String month  =  timeAndDate.substring( 4 ,  6 );
                    String day  =  timeAndDate.substring( 6 ,  8 );
                     return  year  +   " - "   +  month  +   " - "   +  day;
            }
             public  String getTime(String timeAndDate)
             {
                    String hour  =  timeAndDate.substring( 8 ,  10 );
                    String minute  =  timeAndDate.substring( 10 ,  12 );
                    String second  =  timeAndDate.substring( 12 ,  14 );
                     return  hour  +   " : "   +  minute  +   " : "   +  second;
            }
}

Linux系统修改时间

  String os  =  System.getProperty( " os.name " ).toLowerCase(); // 获取操作系统名称

if (os.indexOf( " windows " )  !=   - 1 )
{
    cmd  =   " cmd /c time  "   +  timeStr;
    ProcessUtil.printErr(Runtime.getRuntime().exec(cmd));
    cmd  =   " cmd /c date  "   +  timeStr;
    ProcessUtil.printErr(Runtime.getRuntime().exec(cmd));
   }
    else
    {  
    cmd  =   " date  "   +  timeStr; //timeStr时间到分，先写时间再写日期
    ProcessUtil.printErr(Runtime.getRuntime().exec(cmd));
   }


public class ProcessUtil {
   
    public static void printErr(Process p) {
        BufferedReader br = null;
        try {
            br = new BufferedReader(new InputStreamReader(p.getErrorStream()));
            String line = null;
            while ((line = br.readLine()) != null) {
                System.out.println(line);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (br != null)
                    br.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            p.destroy();
        }
    }
   
    public static void printConsole(Process p) {
        BufferedReader br = null;
        try {
            br = new BufferedReader(new InputStreamReader(p.getInputStream()));
            String line = null;
            while ((line = br.readLine()) != null) {
                System.out.println(line);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (br != null)
                    br.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
   
    public static String getErrInfo(Process p) {
        StringBuffer sb = new StringBuffer();
        BufferedReader br = null;
        try {
            br = new BufferedReader(new InputStreamReader(p.getErrorStream()));
            String line = null;
            while ((line = br.readLine()) != null) {
                sb.append(line).append("\n");
            }
            return sb.toString();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (br != null)
                    br.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return null;
    }

}