用java查看有没有运行进程，或者关闭进程

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;
public class Main {
  /**
   * @param args
   */
  public static void main(String[] args) {
    boolean isrun=isRunning("cmd.exe");
    if(isrun){
      System.out.println("有在运行cmd.exe");
    }else{
      System.out.println("没有运行cmd.exe");
    }
  }
  public static boolean isRunning(String processName)//判断有没有在运行考试软件
    {
        BufferedReader bufferedReader = null;
        try
        {
            Process proc = Runtime.getRuntime().exec("tasklist /FI \"IMAGENAME eq "
                    + processName
                    + "\"");
            bufferedReader = new BufferedReader(new InputStreamReader(proc.getInputStream()));
            String line = null;
            while ((line = bufferedReader.readLine()) != null)
            {
                if (line.contains(processName)) //判断是否存在
                {
                    return true;
                }
            }
            return false;
        }
        catch (Exception ex)
        {
            ex.printStackTrace();
            return false;
        }
        finally
        {
            if (bufferedReader != null)
            {
                try
                {
                    bufferedReader.close();
                }
                catch (Exception ex)
                {
                }
            }
        } 
    }
}

Runtime.getRuntime().exec("taskkill /f /im cmd.exe");