java如何获取本地操作系统进程列表

package com.wa.xwolf.sblog.util;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
public class ProcessUtil {
 public static void main(String[] args) throws Exception {
  // 创建系统进程
  ProcessBuilder pb = new ProcessBuilder("tasklist");
  Process p = pb.start();
  BufferedReader out = new BufferedReader(new InputStreamReader(new BufferedInputStream(p.getInputStream()), Charset.forName("GB2312")));
  BufferedReader err = new BufferedReader(new InputStreamReader(new BufferedInputStream(p.getErrorStream())));
  System.out.println("Window 系统进程列表");
  String ostr;
  while ((ostr = out.readLine()) != null)
  System.out.println(ostr);
  String estr = err.readLine();
  if (estr != null) {
  System.out.println("\nError Info");
  System.out.println(estr);
  }
 }
}