Java Response.setSuspended方法代码示例

import org.apache.catalina.Response; //导入方法依赖的package包/类
/**
 * Invoke the next Valve in the sequence. When the invoke returns, check 
 * the response state, and output an error report is necessary.
 *
 * @param request The servlet request to be processed
 * @param response The servlet response to be created
 * @param context The valve context used to invoke the next valve
 *  in the current processing pipeline
 *
 * @exception IOException if an input/output error occurs
 * @exception ServletException if a servlet error occurs
 */
public void invoke(Request request, Response response,
                   ValveContext context)
    throws IOException, ServletException {

    // Perform the request
    context.invokeNext(request, response);

    response.setSuspended(false);

    ServletRequest sreq = request.getRequest();
    Throwable t = (Throwable) sreq.getAttribute(Globals.EXCEPTION_ATTR);

    if (t != null) {
        throwable(request, response, t);
    } else {
        status(request, response);
    }

}
 

import org.apache.catalina.Response; //导入方法依赖的package包/类
/**
 * Handle an HTTP status code or Java exception by forwarding control
 * to the location included in the specified errorPage object.  It is
 * assumed that the caller has already recorded any request attributes
 * that are to be forwarded to this page.  Return <code>true</code> if
 * we successfully utilized the specified error page location, or
 * <code>false</code> if the default error report should be rendered.
 *
 * @param request The request being processed
 * @param response The response being generated
 * @param errorPage The errorPage directive we are obeying
 */
protected boolean custom(Request request, Response response,
                         ErrorPage errorPage) {

    if (debug >= 1)
        log("Processing " + errorPage);

    // Validate our current environment
    if (!(request instanceof HttpRequest)) {
        if (debug >= 1)
            log(" Not processing an HTTP request --> default handling");
        return (false);     // NOTE - Nothing we can do generically
    }
    HttpServletRequest hreq =
        (HttpServletRequest) request.getRequest();
    if (!(response instanceof HttpResponse)) {
        if (debug >= 1)
            log("Not processing an HTTP response --> default handling");
        return (false);     // NOTE - Nothing we can do generically
    }
    HttpServletResponse hres =
        (HttpServletResponse) response.getResponse();

    try {

        // Reset the response if possible (else IllegalStateException)
        hres.reset();

        // Forward control to the specified location
        ServletContext servletContext =
            request.getContext().getServletContext();
        RequestDispatcher rd =
            servletContext.getRequestDispatcher(errorPage.getLocation());
        rd.forward(hreq, hres);

        // If we forward, the response is suspended again
        response.setSuspended(false);

        // Indicate that we have successfully processed this custom page
        return (true);

    } catch (Throwable t) {

        // Report our failure to process this custom page
        log("Exception Processing " + errorPage, t);
        return (false);

    }

}
 

import org.apache.catalina.Response; //导入方法依赖的package包/类
/**
 * Invoke the next Valve in the sequence. When the invoke returns, check 
 * the response state, and output an error report is necessary.
 *
 * @param request The servlet request to be processed
 * @param response The servlet response to be created
 * @param context The valve context used to invoke the next valve
 *  in the current processing pipeline
 *
 * @exception IOException if an input/output error occurs
 * @exception ServletException if a servlet error occurs
 */
public void invoke(Request request, Response response,
                   ValveContext context)
    throws IOException, ServletException {

    // Perform the request
    context.invokeNext(request, response);

    ServletRequest sreq = (ServletRequest) request;
    Throwable throwable = 
        (Throwable) sreq.getAttribute(Globals.EXCEPTION_ATTR);

    ServletResponse sresp = (ServletResponse) response;
    if (sresp.isCommitted()) {
        return;
    }

    if (throwable != null) {

        // The response is an error
        response.setError();

        // Reset the response (if possible)
        try {
            sresp.reset();
        } catch (IllegalStateException e) {
            ;
        }

        ServletResponse sresponse = (ServletResponse) response;
        if (sresponse instanceof HttpServletResponse)
            ((HttpServletResponse) sresponse).sendError
                (HttpServletResponse.SC_INTERNAL_SERVER_ERROR);

    }

    response.setSuspended(false);

    try {
        report(request, response, throwable);
    } catch (Throwable tt) {
        tt.printStackTrace();
    }

}