到底如何设置Java线程池的大小的方法示例

public class MoniterFilter implements Filter { 
  private static final Logger logger = LoggerFactory.getLogger(MoniterFilter.class); 
  @Override 
  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, 
      ServletException { 
    long start = System.currentTimeMillis(); 
    HttpServletRequest httpRequest = (HttpServletRequest) request; 
    HttpServletResponse httpResponse = (HttpServletResponse) response; 
    String uri = httpRequest.getRequestURI(); 
    String params = getQueryString(httpRequest); 
    try { 
      chain.doFilter(httpRequest, httpResponse); 
    } finally { 
      long cost = System.currentTimeMillis() - start; 
      logger.info("access url [{}{}], cost time [{}] ms )", uri, params, cost); 
    } 
  private String getQueryString(HttpServletRequest req) { 
    StringBuilder buffer = new StringBuilder("?"); 
    Enumeration<String> emParams = req.getParameterNames(); 
    try { 
      while (emParams.hasMoreElements()) { 
        String sParam = emParams.nextElement(); 
        String sValues = req.getParameter(sParam); 
        buffer.append(sParam).append("=").append(sValues).append("&"); 
      } 
      return buffer.substring(0, buffer.length() - 1); 
    } catch (Exception e) { 
      logger.error("get post arguments error", buffer.toString()); 
    } 
    return ""; 
  } 
} 

public class DaoInterceptor implements MethodInterceptor { 
  private static final Logger logger = LoggerFactory.getLogger(DaoInterceptor.class); 
  @Override 
  public Object invoke(MethodInvocation invocation) throws Throwable { 
    StopWatch watch = new StopWatch(); 
    watch.start(); 
    Object result = null; 
    Throwable t = null; 
    try { 
      result = invocation.proceed(); 
    } catch (Throwable e) { 
      t = e == null ? null : e.getCause(); 
      throw e; 
    } finally { 
      watch.stop(); 
      logger.info("({}ms)", watch.getTotalTimeMillis()); 
    } 
    return result; 
  } 
} 

cat /proc/cpuinfo| grep "processor"| wc -l