java获取系统开机时间

 

Runtime.getRuntime().exec来得到，头疼，上代码：import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;public class Test {/*** @param args*/public static void main(String[] args) throws Exception{   System.out.println(Test.readSystemStartTime());  }public static String readSystemStartTime() throws IOException,     InterruptedException {         Process process = Runtime.getRuntime().exec(             "cmd /c net statistics workstation");         String startUpTime = "";         BufferedReader bufferedReader = new BufferedReader(             new InputStreamReader(process.getInputStream()));         int i = 0;         String timeWith = "";         while ((timeWith = bufferedReader.readLine()) != null) {            if (i == 3) {                System.out.println(timeWith);                startUpTime = timeWith;          }         i++;        }         process.waitFor();         return startUpTime; } }