?? abstractexceptionhandler.java
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// Copyright 2005-2007 onetsoft.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.onetsoft.fastjsp;
import com.onetsoft.fastjsp.util.Constants;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* 抽象錯誤處理類
* 自定義錯誤處理應繼承此類
*
* @author <a href="mailto:hgw@onetsoft.com">hgw</a>
* @since 2.0
*/
public abstract class AbstractExceptionHandler implements ExceptionHandler {
public void handle(Exception exception, Servicer servicer) throws IOException, ServletException {
if (exception instanceof RedirectException) {
handleRedirectException((RedirectException) exception, servicer);
} else if (exception instanceof PageRedirectException) {
handlePageRedirectException((PageRedirectException) exception, servicer);
} else {
handleException(exception, servicer);
}
}
private void handleRedirectException(RedirectException e, Servicer servicer) throws IOException {
HttpServletResponse response = servicer.getResponse();
response.sendRedirect(response.encodeRedirectURL(e.getUrl()));
}
private void handlePageRedirectException(PageRedirectException e, Servicer servicer) throws IOException, ServletException {
servicer.getRequest().setAttribute(Constants.EXCEPTION_ATTRIBUTE, e);
((AbstractServicer) servicer).forward(e.getPage());
}
/**
* 處理系統拋出的各類錯誤
*
* @param exception
* @param servicer
*/
protected abstract void handleException(Exception exception, Servicer servicer) throws IOException, ServletException;
}
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