|
Jetty example source code file (ErrorPageErrorHandler.java)
The Jetty ErrorPageErrorHandler.java source code// ======================================================================== // Copyright 2006 Mort Bay Consulting Pty. Ltd. // ------------------------------------------------------------------------ // 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 org.mortbay.jetty.servlet; import java.io.IOException; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.mortbay.jetty.handler.ContextHandler; import org.mortbay.jetty.handler.ErrorHandler; import org.mortbay.jetty.webapp.WebAppContext; import org.mortbay.log.Log; import org.mortbay.util.TypeUtil; /** Error Page Error Handler * * An ErrorHandler that maps exceptions and status codes to URIs for dispatch using * the internal ERROR style of dispatch. * @author gregw * */ public class ErrorPageErrorHandler extends ErrorHandler { protected ServletContext _servletContext; protected Map _errorPages; // code or exception to URL protected List _errorPageList; // list of ErrorCode by range /* ------------------------------------------------------------ */ /** * @param context */ public ErrorPageErrorHandler() {} /* ------------------------------------------------------------ */ /* * @see org.mortbay.jetty.handler.ErrorHandler#handle(java.lang.String, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, int) */ public void handle(String target, HttpServletRequest request, HttpServletResponse response, int dispatch) throws IOException { if (_errorPages!=null) { String error_page= null; Class exClass= (Class)request.getAttribute(ServletHandler.__J_S_ERROR_EXCEPTION_TYPE); if (ServletException.class.equals(exClass)) { error_page= (String)_errorPages.get(exClass.getName()); if (error_page == null) { Throwable th= (Throwable)request.getAttribute(ServletHandler.__J_S_ERROR_EXCEPTION); while (th instanceof ServletException) th= ((ServletException)th).getRootCause(); if (th != null) exClass= th.getClass(); } } while (error_page == null && exClass != null ) { error_page= (String)_errorPages.get(exClass.getName()); exClass= exClass.getSuperclass(); } if (error_page == null) { // look for an exact code match Integer code=(Integer)request.getAttribute(ServletHandler.__J_S_ERROR_STATUS_CODE); if (code!=null) { error_page= (String)_errorPages.get(TypeUtil.toString(code.intValue())); // if still not found if ((error_page == null) && (_errorPageList != null)) { // look for an error code range match. for (int i = 0; i < _errorPageList.size(); i++) { ErrorCodeRange errCode = (ErrorCodeRange) _errorPageList.get(i); if (errCode.isInRange(code.intValue())) { error_page = errCode.getUri(); break; } } } } } if (error_page!=null) { String old_error_page=(String)request.getAttribute(WebAppContext.ERROR_PAGE); if (old_error_page==null || !old_error_page.equals(error_page)) { request.setAttribute(WebAppContext.ERROR_PAGE, error_page); Dispatcher dispatcher = (Dispatcher) _servletContext.getRequestDispatcher(error_page); try { if(dispatcher!=null) { dispatcher.error(request, response); return; } else { Log.warn("No error page "+error_page); } } catch (ServletException e) { Log.warn(Log.EXCEPTION, e); return; } } } } super.handle(target, request, response, dispatch); } /* ------------------------------------------------------------ */ /** * @return Returns the errorPages. */ public Map getErrorPages() { return _errorPages; } /* ------------------------------------------------------------ */ /** * @param errorPages The errorPages to set. A map of Exception class name or error code as a string to URI string */ public void setErrorPages(Map errorPages) { _errorPages = errorPages; } /* ------------------------------------------------------------ */ /** Add Error Page mapping for an exception class * This method is called as a result of an exception-type element in a web.xml file * or may be called directly * @param code The class (or superclass) of the matching exceptions * @param uri The URI of the error page. */ public void addErrorPage(Class exception,String uri) { if (_errorPages==null) _errorPages=new HashMap(); _errorPages.put(exception.getName(),uri); } /* ------------------------------------------------------------ */ /** Add Error Page mapping for a status code. * This method is called as a result of an error-code element in a web.xml file * or may be called directly * @param code The HTTP status code to match * @param uri The URI of the error page. */ public void addErrorPage(int code,String uri) { if (_errorPages==null) _errorPages=new HashMap(); _errorPages.put(TypeUtil.toString(code),uri); } /* ------------------------------------------------------------ */ /** Add Error Page mapping for a status code range. * This method is not available from web.xml and must be called * directly. * @param from The lowest matching status code * @param to The highest matching status code * @param uri The URI of the error page. */ public void addErrorPage(int from, int to, String uri) { if (_errorPageList == null) { _errorPageList = new ArrayList(); } _errorPageList.add(new ErrorCodeRange(from, to, uri)); } /* ------------------------------------------------------------ */ protected void doStart() throws Exception { super.doStart(); _servletContext=ContextHandler.getCurrentContext(); } /* ------------------------------------------------------------ */ protected void doStop() throws Exception { // TODO Auto-generated method stub super.doStop(); } /* ------------------------------------------------------------ */ /* ------------------------------------------------------------ */ private class ErrorCodeRange { private int _from; private int _to; private String _uri; ErrorCodeRange(int from, int to, String uri) throws IllegalArgumentException { if (from > to) throw new IllegalArgumentException("from>to"); _from = from; _to = to; _uri = uri; } boolean isInRange(int value) { if ((value >= _from) && (value <= _to)) { return true; } return false; } String getUri() { return _uri; } public String toString() { return "from: " + _from + ",to: " + _to + ",uri: " + _uri; } } } Other Jetty examples (source code examples)Here is a short list of links related to this Jetty ErrorPageErrorHandler.java source code file: |
... this post is sponsored by my books ... | |
#1 New Release! |
FP Best Seller |
Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.
A percentage of advertising revenue from
pages under the /java/jwarehouse
URI on this website is
paid back to open source projects.