HttpServlet类中的两个service()方法

HttpServlet类中有两个service()方法 HttpServlet源码在Tomcat的jar包中。

public void service(ServletRequest req, ServletResponse res) throws ServletException,IOException{...};

Protect void service(HttpServiceRequest req, HttpServletResponse resp) throws ServletException,IOException {...}

调用时用公用的service方法去调用受保护的service方法。

HttpServlet类中定义如下：

protected void service(HttpServletRequest req, HttpServletResponse resp)         throws ServletException, IOException {         String method = req.getMethod();         if (method.equals(METHOD_GET)) {             long lastModified = getLastModified(req);             if (lastModified == -1) {                 // servlet doesn't support if-modified-since, no reason                 // to go through further expensive logic                 doGet(req, resp);             } else {         ........

}

  public void service(ServletRequest req, ServletResponse res)         throws ServletException, IOException {         HttpServletRequest  request;         HttpServletResponse response;         try {             request = (HttpServletRequest) req;             response = (HttpServletResponse) res;         } catch (ClassCastException e) {             throw new ServletException("non-HTTP request or response");         }         service(request, response);     }