Java tutorial
/* * Copyright (c) 2016 Network New Technologies Inc. * * 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.networknt.utility; import org.apache.commons.codec.binary.Base64; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.net.InetAddress; import java.net.URL; import java.net.URLDecoder; import java.net.URLEncoder; import java.nio.ByteBuffer; import java.util.Arrays; import java.util.List; import java.util.Map; import java.util.UUID; import java.util.regex.Matcher; import java.util.regex.Pattern; /** * Generic utilities * * @author Steve Hu */ public class Util { static final Logger logger = LoggerFactory.getLogger(Util.class); public static final List<String> METHODS = Arrays.asList("GET", "HEAD", "POST", "PUT", "DELETE", "CONNECT", "OPTIONS", "TRACE", "PATCH"); /** * Generate UUID across the entire app and it is used for correlationId. * * @return String correlationId */ public static String getUUID() { UUID id = UUID.randomUUID(); ByteBuffer bb = ByteBuffer.wrap(new byte[16]); bb.putLong(id.getMostSignificantBits()); bb.putLong(id.getLeastSignificantBits()); return Base64.encodeBase64URLSafeString(bb.array()); } /** * Quote the given string if needed * * @param value The value to quote (e.g. bob) * @return The quoted string (e.g. "bob") */ public static String quote(final String value) { if (value == null) { return null; } String result = value; if (!result.startsWith("\"")) { result = "\"" + result; } if (!result.endsWith("\"")) { result = result + "\""; } return result; } /** * Get InetAddress * @return The InetAddress object * @deprecated */ public static InetAddress getInetAddress() { InetAddress inetAddress = null; try { inetAddress = InetAddress.getLocalHost(); } catch (IOException ioe) { logger.error("Error in getting InetAddress", ioe); } return inetAddress; } public static String getJarVersion() { String path = Util.class.getProtectionDomain().getCodeSource().getLocation().getPath(); //String path = "/Users/stevehu/project/light-example-4j/petstore/target/swagger-light-server-1.0.0.jar"; logger.debug("path = " + path); String ver = null; if (path.endsWith(".jar")) { int endIndex = path.indexOf(".jar"); int startIndex = path.lastIndexOf("/"); String jarName = path.substring(startIndex + 1, endIndex); ver = jarName.substring(jarName.lastIndexOf("-") + 1); } return ver; } public static String getFrameworkVersion() { // this doesn't work. // TODO make it work. Class clazz = Util.class; URL location = clazz.getResource('/' + clazz.getName().replace('.', '/') + ".class"); System.out.println("location = " + location); //location = jar:file:/Users/stevehu/project/light-example-4j/petstore/target/swagger-light-server-1.0.0.jar!/com/networknt/utility/Util.class return location.toString(); } public static int parseInteger(String intStr) { if (intStr == null) { return Constants.DEFAULT_INT_VALUE; } try { return Integer.parseInt(intStr); } catch (NumberFormatException e) { return Constants.DEFAULT_INT_VALUE; } } public static String urlEncode(String value) { if (value == null || value.length() == 0) { return ""; } try { return URLEncoder.encode(value, Constants.DEFAULT_CHARACTER); } catch (UnsupportedEncodingException e) { throw new RuntimeException(e.getMessage(), e); } } public static String urlDecode(String value) { if (value == null || value.length() == 0) { return ""; } try { return URLDecoder.decode(value, Constants.DEFAULT_CHARACTER); } catch (UnsupportedEncodingException e) { throw new RuntimeException(e.getMessage(), e); } } public static String substituteVariables(String template, Map<String, String> variables) { Pattern pattern = Pattern.compile("\\$\\{(.+?)\\}"); Matcher matcher = pattern.matcher(template); // StringBuilder cannot be used here because Matcher expects StringBuffer StringBuffer buffer = new StringBuffer(); while (matcher.find()) { if (variables.containsKey(matcher.group(1))) { String replacement = variables.get(matcher.group(1)); // quote to work properly with $ and {,} signs matcher.appendReplacement(buffer, replacement != null ? Matcher.quoteReplacement(replacement) : "null"); } } matcher.appendTail(buffer); return buffer.toString(); } }