📄 servertimefilter.java
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/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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.apache.wicket.markup.html;import org.apache.wicket.IResponseFilter;import org.apache.wicket.RequestCycle;import org.apache.wicket.util.string.AppendingStringBuffer;import org.apache.wicket.util.string.JavascriptUtils;import org.slf4j.Logger;import org.slf4j.LoggerFactory;/** * This filter logs the server time so the time it takes from the start of a request and the end of * the response. It will log this to the standard logger, and will also change the response buffer * if it finds a <head></head> part to insert the script: * * <script> window.defaultStatus = 'Server time: 0.01s' </script> * * @author jcompagner */public class ServerTimeFilter implements IResponseFilter{ private static final Logger log = LoggerFactory.getLogger(ServerTimeFilter.class); /** * @see org.apache.wicket.IResponseFilter#filter(AppendingStringBuffer) */ public AppendingStringBuffer filter(AppendingStringBuffer responseBuffer) { int index = responseBuffer.indexOf("<head>"); long timeTaken = System.currentTimeMillis() - RequestCycle.get().getStartTime(); if (index != -1) { AppendingStringBuffer script = new AppendingStringBuffer(75); script.append("\n"); script.append(JavascriptUtils.SCRIPT_OPEN_TAG); script.append("\nwindow.defaultStatus='Server time: "); script.append(((double)timeTaken) / 1000); script.append("s';\n"); script.append(JavascriptUtils.SCRIPT_CLOSE_TAG); script.append("\n"); responseBuffer.insert(index + 6, script); } log.info(timeTaken + "ms server time taken for request " + RequestCycle.get().getRequest().getURL() + " response size: " + responseBuffer.length()); return responseBuffer; }}⌨️ 快捷键说明
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