Java Response.reset方法代碼示例

import org.apache.catalina.connector.Response; //導入方法依賴的package包/類
/**
 * 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
 *
 * @exception IOException if an input/output error occurs
 * @exception ServletException if a servlet error occurs
 */
public void invoke(Request request, Response response)
    throws IOException, ServletException {

    // Perform the request
    getNext().invoke(request, response);

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

    if (response.isCommitted()) {
        return;
    }

    if (throwable != null) {

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

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

        response.sendError
            (HttpServletResponse.SC_INTERNAL_SERVER_ERROR);

    }

    response.setSuspended(false);

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

}
 

import org.apache.catalina.connector.Response; //導入方法依賴的package包/類
/**
 * Invoke the next Valve in the sequence. When the invoke returns, check
 * the response state. If the status code is greater than or equal to 400
 * or an uncaught exception was thrown then the error handling will be
 * triggered.
 *
 * @param request The servlet request to be processed
 * @param response The servlet response to be created
 *
 * @exception IOException if an input/output error occurs
 * @exception ServletException if a servlet error occurs
 */
@Override
public void invoke(Request request, Response response) throws IOException, ServletException {

    // Perform the request
    getNext().invoke(request, response);

    if (response.isCommitted()) {
        if (response.setErrorReported()) {
            // Error wasn't previously reported but we can't write an error
            // page because the response has already been committed. Attempt
            // to flush any data that is still to be written to the client.
            try {
                response.flushBuffer();
            } catch (Throwable t) {
                ExceptionUtils.handleThrowable(t);
            }
            // Close immediately to signal to the client that something went
            // wrong
            response.getCoyoteResponse().action(ActionCode.CLOSE_NOW, null);
        }
        return;
    }

    Throwable throwable = (Throwable) request.getAttribute(RequestDispatcher.ERROR_EXCEPTION);

    // If an async request is in progress and is not going to end once this
    // container thread finishes, do not process any error page here.
    if (request.isAsync() && !request.isAsyncCompleting()) {
        return;
    }

    if (throwable != null && !response.isError()) {
        // Make sure that the necessary methods have been called on the
        // response. (It is possible a component may just have set the
        // Throwable. Tomcat won't do that but other components might.)
        // These are safe to call at this point as we know that the response
        // has not been committed.
        response.reset();
        response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    }

    // One way or another, response.sendError() will have been called before
    // execution reaches this point and suspended the response. Need to
    // reverse that so this valve can write to the response.
    response.setSuspended(false);

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

import org.apache.catalina.connector.Response; //導入方法依賴的package包/類
/**
 * Invoke the next Valve in the sequence. When the invoke returns, check the
 * response state. If the status code is greater than or equal to 400 or an
 * uncaught exception was thrown then the error handling will be triggered.
 *
 * @param request
 *            The servlet request to be processed
 * @param response
 *            The servlet response to be created
 *
 * @exception IOException
 *                if an input/output error occurs
 * @exception ServletException
 *                if a servlet error occurs
 */
@Override
public void invoke(Request request, Response response) throws IOException, ServletException {

	// Perform the request
	getNext().invoke(request, response);

	if (response.isCommitted()) {
		if (response.setErrorReported()) {
			// Error wasn't previously reported but we can't write an error
			// page because the response has already been committed. Attempt
			// to flush any data that is still to be written to the client.
			try {
				response.flushBuffer();
			} catch (Throwable t) {
				ExceptionUtils.handleThrowable(t);
			}
			// Close immediately to signal to the client that something went
			// wrong
			response.getCoyoteResponse().action(ActionCode.CLOSE_NOW, null);
		}
		return;
	}

	Throwable throwable = (Throwable) request.getAttribute(RequestDispatcher.ERROR_EXCEPTION);

	// If an async request is in progress and is not going to end once this
	// container thread finishes, do not process any error page here.
	if (request.isAsync() && !request.isAsyncCompleting()) {
		return;
	}

	if (throwable != null && !response.isError()) {
		// Make sure that the necessary methods have been called on the
		// response. (It is possible a component may just have set the
		// Throwable. Tomcat won't do that but other components might.)
		// These are safe to call at this point as we know that the response
		// has not been committed.
		response.reset();
		response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
	}

	// One way or another, response.sendError() will have been called before
	// execution reaches this point and suspended the response. Need to
	// reverse that so this valve can write to the response.
	response.setSuspended(false);

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