📄 serverhostnameandtimefilter.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.examples;import java.net.InetAddress;import java.net.UnknownHostException;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.apache.wicket.util.string.Strings;import org.apache.wicket.util.time.Duration;/** * Displays server host name (combination of name, ipaddress and unique id, which is either based) * and time it took to handle the request in the browser's status bar like this: * <code>window.defaultStatus = 'Host: myhost/192.168.1.66/someid, handled in: 0.01s'</code> * * @author eelco hillenius */public class ServerHostNameAndTimeFilter implements IResponseFilter{ private String host; /** * Construct, trying system property 'examples.hostname' for the server id or else current time * milis. */ public ServerHostNameAndTimeFilter() { String hostId = null; try { hostId = System.getProperty("examples.hostname"); } catch (SecurityException e) { } if (Strings.isEmpty(hostId)) { hostId = String.valueOf(System.currentTimeMillis()); } setHostName(hostId); } /** * Construct with an id. * * @param hostId * a unique id indentifying this server instance */ public ServerHostNameAndTimeFilter(String hostId) { if (hostId == null) { throw new IllegalArgumentException("hostId may not be null"); } setHostName(hostId); } /** * @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("\n\twindow.defaultStatus='"); script.append("Host: "); script.append(host); script.append(", handled in: "); script.append(Duration.milliseconds(timeTaken)); script.append("';\n"); script.append(JavascriptUtils.SCRIPT_CLOSE_TAG); script.append("\n"); responseBuffer.insert(index + 6, script); } return responseBuffer; } /** * Fill host name property. * * @param hostId */ private void setHostName(String hostId) { try { InetAddress localMachine = InetAddress.getLocalHost(); String hostName = localMachine.getHostName(); String address = localMachine.getHostAddress(); host = ((!Strings.isEmpty(hostName)) ? hostName + "/" + address : address) + "/" + hostId; } catch (UnknownHostException e) { } if (Strings.isEmpty(host)) { host = "<unknown>"; } }}⌨️ 快捷键说明
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