add freemarker sample in springboot

Author: ipipman

springboot-freemarker-sample/.gitignore

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+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

springboot-freemarker-sample/.mvn/wrapper/MavenWrapperDownloader.java

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+/*
+* Copyright 2007-present the original author or authors.
+*
+* 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
+*
+* https://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.
+*/
+
+import java.net.*;
+import java.io.*;
+import java.nio.channels.*;
+import java.util.Properties;
+
+public class MavenWrapperDownloader {
+
+private static final String WRAPPER_VERSION = "0.5.6";
+/**
+* Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided.
+*/
+private static final String DEFAULT_DOWNLOAD_URL = "https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/"
++ WRAPPER_VERSION + "/maven-wrapper-" + WRAPPER_VERSION + ".jar";
+
+/**
+* Path to the maven-wrapper.properties file, which might contain a downloadUrl property to
+* use instead of the default one.
+*/
+private static final String MAVEN_WRAPPER_PROPERTIES_PATH =
+".mvn/wrapper/maven-wrapper.properties";
+
+/**
+* Path where the maven-wrapper.jar will be saved to.
+*/
+private static final String MAVEN_WRAPPER_JAR_PATH =
+".mvn/wrapper/maven-wrapper.jar";
+
+/**
+* Name of the property which should be used to override the default download url for the wrapper.
+*/
+private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl";
+
+public static void main(String args[]) {
+System.out.println("- Downloader started");
+File baseDirectory = new File(args[0]);
+System.out.println("- Using base directory: " + baseDirectory.getAbsolutePath());
+
+// If the maven-wrapper.properties exists, read it and check if it contains a custom
+// wrapperUrl parameter.
+File mavenWrapperPropertyFile = new File(baseDirectory, MAVEN_WRAPPER_PROPERTIES_PATH);
+String url = DEFAULT_DOWNLOAD_URL;
+if (mavenWrapperPropertyFile.exists()) {
+FileInputStream mavenWrapperPropertyFileInputStream = null;
+try {
+mavenWrapperPropertyFileInputStream = new FileInputStream(mavenWrapperPropertyFile);
+Properties mavenWrapperProperties = new Properties();
+mavenWrapperProperties.load(mavenWrapperPropertyFileInputStream);
+url = mavenWrapperProperties.getProperty(PROPERTY_NAME_WRAPPER_URL, url);
+} catch (IOException e) {
+System.out.println("- ERROR loading '" + MAVEN_WRAPPER_PROPERTIES_PATH + "'");
+} finally {
+try {
+if (mavenWrapperPropertyFileInputStream != null) {
+mavenWrapperPropertyFileInputStream.close();
+}
+} catch (IOException e) {
+// Ignore ...
+}
+}
+}
+System.out.println("- Downloading from: " + url);
+
+File outputFile = new File(baseDirectory.getAbsolutePath(), MAVEN_WRAPPER_JAR_PATH);
+if (!outputFile.getParentFile().exists()) {
+if (!outputFile.getParentFile().mkdirs()) {
+System.out.println(
+"- ERROR creating output directory '" + outputFile.getParentFile().getAbsolutePath() + "'");
+}
+}
+System.out.println("- Downloading to: " + outputFile.getAbsolutePath());
+try {
+downloadFileFromURL(url, outputFile);
+System.out.println("Done");
+System.exit(0);
+} catch (Throwable e) {
+System.out.println("- Error downloading");
+e.printStackTrace();
+System.exit(1);
+}
+}
+
+private static void downloadFileFromURL(String urlString, File destination) throws Exception {
+if (System.getenv("MVNW_USERNAME") != null && System.getenv("MVNW_PASSWORD") != null) {
+String username = System.getenv("MVNW_USERNAME");
+char[] password = System.getenv("MVNW_PASSWORD").toCharArray();
+Authenticator.setDefault(new Authenticator() {
+@Override
+protected PasswordAuthentication getPasswordAuthentication() {
+return new PasswordAuthentication(username, password);
+}
+});
+}
+URL website = new URL(urlString);
+ReadableByteChannel rbc;
+rbc = Channels.newChannel(website.openStream());
+FileOutputStream fos = new FileOutputStream(destination);
+fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
+fos.close();
+rbc.close();
+}
+
+}

springboot-freemarker-sample/.mvn/wrapper/maven-wrapper.jar

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+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.2/apache-maven-3.8.2-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar