📄 errorhandler.java
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// ========================================================================// Copyright 1999-2005 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.handler;import java.io.IOException;import java.io.PrintWriter;import java.io.StringWriter;import java.io.Writer;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.mortbay.jetty.HttpConnection;import org.mortbay.jetty.HttpGenerator;import org.mortbay.jetty.HttpHeaders;import org.mortbay.jetty.HttpMethods;import org.mortbay.jetty.MimeTypes;import org.mortbay.util.ByteArrayISO8859Writer;import org.mortbay.util.StringUtil;/* ------------------------------------------------------------ *//** Handler for Error pages * A handler that is registered at the org.mortbay.http.ErrorHandler * context attributed and called by the HttpResponse.sendError method to write a * error page. * * @author Greg Wilkins (gregw) */public class ErrorHandler extends AbstractHandler{ boolean _showStacks=true; /* ------------------------------------------------------------ */ /* * @see org.mortbay.jetty.Handler#handle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, int) */ public void handle(String target, HttpServletRequest request, HttpServletResponse response, int dispatch) throws IOException { HttpConnection connection = HttpConnection.getCurrentConnection(); connection.getRequest().setHandled(true); String method = request.getMethod(); if(!method.equals(HttpMethods.GET) && !method.equals(HttpMethods.POST)) return; response.setContentType(MimeTypes.TEXT_HTML_8859_1); response.setHeader(HttpHeaders.CACHE_CONTROL, "must-revalidate,no-cache,no-store"); ByteArrayISO8859Writer writer= new ByteArrayISO8859Writer(4096); handleErrorPage(request, writer, connection.getResponse().getStatus(), connection.getResponse().getReason()); writer.flush(); response.setContentLength(writer.size()); writer.writeTo(response.getOutputStream()); writer.destroy(); } /* ------------------------------------------------------------ */ protected void handleErrorPage(HttpServletRequest request, Writer writer, int code, String message) throws IOException { writeErrorPage(request, writer, code, message, _showStacks); } /* ------------------------------------------------------------ */ protected void writeErrorPage(HttpServletRequest request, Writer writer, int code, String message, boolean showStacks) throws IOException { if (message == null) message=HttpGenerator.getReason(code); else { message= StringUtil.replace(message, "&", "&"); message= StringUtil.replace(message, "<", "<"); message= StringUtil.replace(message, ">", ">"); } writer.write("<html>\n<head>\n"); writeErrorPageHead(request,writer,code,message); writer.write("</head>\n<body>"); writeErrorPageBody(request,writer,code,message,showStacks); writer.write("\n</body>\n</html>\n"); } /* ------------------------------------------------------------ */ protected void writeErrorPageHead(HttpServletRequest request, Writer writer, int code, String message) throws IOException { writer.write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=ISO-8859-1\"/>\n"); writer.write("<title>Error "); writer.write(Integer.toString(code)); writer.write(' '); if (message!=null) writer.write(message); writer.write("</title>\n"); } /* ------------------------------------------------------------ */ protected void writeErrorPageBody(HttpServletRequest request, Writer writer, int code, String message, boolean showStacks) throws IOException { String uri= request.getRequestURI(); if (uri!=null) { uri= StringUtil.replace(uri, "&", "&"); uri= StringUtil.replace(uri, "<", "<"); uri= StringUtil.replace(uri, ">", ">"); } writeErrorPageMessage(request,writer,code,message,uri); if (showStacks) writeErrorPageStacks(request,writer); writer.write("<hr /><i><small>Powered by Jetty://</small></i>"); for (int i= 0; i < 20; i++) writer.write("<br/> \n"); } /* ------------------------------------------------------------ */ protected void writeErrorPageMessage(HttpServletRequest request, Writer writer, int code, String message,String uri) throws IOException { writer.write("<h2>HTTP ERROR "); writer.write(Integer.toString(code)); writer.write("</h2>\n<p>Problem accessing "); writer.write(uri); writer.write(". Reason:\n<pre> "); writer.write(message); writer.write("</pre></p>"); } /* ------------------------------------------------------------ */ protected void writeErrorPageStacks(HttpServletRequest request, Writer writer) throws IOException { Throwable th = (Throwable)request.getAttribute("javax.servlet.error.exception"); while(th!=null) { writer.write("<h3>Caused by:</h3><pre>"); StringWriter sw = new StringWriter(); PrintWriter pw = new PrintWriter(sw); th.printStackTrace(pw); pw.flush(); writer.write(sw.getBuffer().toString()); writer.write("</pre>\n"); th =th.getCause(); } } /* ------------------------------------------------------------ */ /** * @return True if stack traces are shown in the error pages */ public boolean isShowStacks() { return _showStacks; } /* ------------------------------------------------------------ */ /** * @param showStacks True if stack traces are shown in the error pages */ public void setShowStacks(boolean showStacks) { _showStacks = showStacks; }}⌨️ 快捷键说明
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