java 属性消息

Build的方法：

@ImportRuntimeHints(BuildPropertiesRuntimeHints.class)
public class BuildProperties extends InfoProperties {

	/**
	 * Create an instance with the specified entries.
	 * @param entries the information to expose
	 */
	public BuildProperties(Properties entries) {
		super(processEntries(entries));
	}

	/**
	 * Return the groupId of the project or {@code null}.
	 * @return the group
	 */
	public String getGroup() {
		return get("group");
	}

	/**
	 * Return the artifactId of the project or {@code null}.
	 * @return the artifact
	 */
	public String getArtifact() {
		return get("artifact");
	}

	/**
	 * Return the name of the project or {@code null}.
	 * @return the name
	 */
	public String getName() {
		return get("name");
	}

	/**
	 * Return the version of the project or {@code null}.
	 * @return the version
	 */
	public String getVersion() {
		return get("version");
	}

	/**
	 * Return the timestamp of the build or {@code null}.
	 * <p>
	 * If the original value could not be parsed properly, it is still available with the
	 * {@code time} key.
	 * @return the build time
	 * @see #get(String)
	 */
	public Instant getTime() {
		return getInstant("time");
	}

	private static Properties processEntries(Properties properties) {
		coerceDate(properties, "time");
		return properties;
	}

	private static void coerceDate(Properties properties, String key) {
		String value = properties.getProperty(key);
		if (value != null) {
			try {
				String updatedValue = String
						.valueOf(DateTimeFormatter.ISO_INSTANT.parse(value, Instant::from).toEpochMilli());
				properties.setProperty(key, updatedValue);
			}
			catch (DateTimeException ex) {
				// Ignore and store the original value
			}
		}
	}

	static class BuildPropertiesRuntimeHints implements RuntimeHintsRegistrar {

		@Override
		public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
			hints.resources().registerPattern("META-INF/build-info.properties");
		}

	}

2.GitProperties

/*
 * Copyright 2012-2022 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.
 */

package org.springframework.boot.info;

import java.time.Instant;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import java.util.Properties;

import org.springframework.aot.hint.RuntimeHints;
import org.springframework.aot.hint.RuntimeHintsRegistrar;
import org.springframework.boot.info.GitProperties.GitPropertiesRuntimeHints;
import org.springframework.context.annotation.ImportRuntimeHints;

/**
 * Provide git-related information such as commit id and time.
 *
 * @author Stephane Nicoll
 * @since 1.4.0
 */
@ImportRuntimeHints(GitPropertiesRuntimeHints.class)
public class GitProperties extends InfoProperties {

	public GitProperties(Properties entries) {
		super(processEntries(entries));
	}

	/**
	 * Return the name of the branch or {@code null}.
	 * @return the branch
	 */
	public String getBranch() {
		return get("branch");
	}

	/**
	 * Return the full id of the commit or {@code null}.
	 * @return the full commit id
	 */
	public String getCommitId() {
		return get("commit.id");
	}

	/**
	 * Return the abbreviated id of the commit or {@code null}.
	 * @return the short commit id
	 */
	public String getShortCommitId() {
		String shortId = get("commit.id.abbrev");
		if (shortId != null) {
			return shortId;
		}
		String id = getCommitId();
		if (id == null) {
			return null;
		}
		return (id.length() > 7) ? id.substring(0, 7) : id;
	}

	/**
	 * Return the timestamp of the commit or {@code null}.
	 * <p>
	 * If the original value could not be parsed properly, it is still available with the
	 * {@code commit.time} key.
	 * @return the commit time
	 * @see #get(String)
	 */
	public Instant getCommitTime() {
		return getInstant("commit.time");
	}

	private static Properties processEntries(Properties properties) {
		coercePropertyToEpoch(properties, "commit.time");
		coercePropertyToEpoch(properties, "build.time");
		Object commitId = properties.get("commit.id");
		if (commitId != null) {
			// Can get converted into a map, so we copy the entry as a nested key
			properties.put("commit.id.full", commitId);
		}
		return properties;
	}

	private static void coercePropertyToEpoch(Properties properties, String key) {
		String value = properties.getProperty(key);
		if (value != null) {
			properties.setProperty(key, coerceToEpoch(value));
		}
	}

	/**
	 * Attempt to convert the specified value to epoch time. Git properties information
	 * are known to be specified either as epoch time in seconds or using a specific date
	 * format.
	 * @param s the value to coerce to
	 * @return the epoch time in milliseconds or the original value if it couldn't be
	 * converted
	 */
	private static String coerceToEpoch(String s) {
		Long epoch = parseEpochSecond(s);
		if (epoch != null) {
			return String.valueOf(epoch);
		}
		DateTimeFormatter format = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ssZ");
		try {
			return String.valueOf(format.parse(s, Instant::from).toEpochMilli());
		}
		catch (DateTimeParseException ex) {
			return s;
		}
	}

	private static Long parseEpochSecond(String s) {
		try {
			return Long.parseLong(s) * 1000;
		}
		catch (NumberFormatException ex) {
			return null;
		}
	}

	static class GitPropertiesRuntimeHints implements RuntimeHintsRegistrar {

		@Override
		public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
			hints.resources().registerPattern("git.properties");
		}

	}

}

3.InfoProperties:

public class InfoProperties implements Iterable<InfoProperties.Entry> {

	private final Properties entries;

	/**
	 * Create an instance with the specified entries.
	 * @param entries the information to expose
	 */
	public InfoProperties(Properties entries) {
		Assert.notNull(entries, "Entries must not be null");
		this.entries = copy(entries);
	}

	/**
	 * Return the value of the specified property or {@code null}.
	 * @param key the key of the property
	 * @return the property value
	 */
	public String get(String key) {
		return this.entries.getProperty(key);
	}

	/**
	 * Return the value of the specified property as an {@link Instant} or {@code null} if
	 * the value is not a valid {@link Long} representation of an epoch time.
	 * @param key the key of the property
	 * @return the property value
	 */
	public Instant getInstant(String key) {
		String s = get(key);
		if (s != null) {
			try {
				return Instant.ofEpochMilli(Long.parseLong(s));
			}
			catch (NumberFormatException ex) {
				// Not valid epoch time
			}
		}
		return null;
	}

	@Override
	public Iterator<Entry> iterator() {
		return new PropertiesIterator(this.entries);
	}

	/**
	 * Return a {@link PropertySource} of this instance.
	 * @return a {@link PropertySource}
	 */
	public PropertySource<?> toPropertySource() {
		return new PropertiesPropertySource(getClass().getSimpleName(), copy(this.entries));
	}

	private Properties copy(Properties properties) {
		Properties copy = new Properties();
		copy.putAll(properties);
		return copy;
	}

	private static final class PropertiesIterator implements Iterator<Entry> {

		private final Iterator<Map.Entry<Object, Object>> iterator;

		private PropertiesIterator(Properties properties) {
			this.iterator = properties.entrySet().iterator();
		}

		@Override
		public boolean hasNext() {
			return this.iterator.hasNext();
		}

		@Override
		public Entry next() {
			Map.Entry<Object, Object> entry = this.iterator.next();
			return new Entry((String) entry.getKey(), (String) entry.getValue());
		}

		@Override
		public void remove() {
			throw new UnsupportedOperationException("InfoProperties are immutable.");
		}

	}

	/**
	 * Property entry.
	 */
	public static final class Entry {

		private final String key;

		private final String value;

		private Entry(String key, String value) {
			this.key = key;
			this.value = value;
		}

		public String getKey() {
			return this.key;
		}

		public String getValue() {
			return this.value;
		}

	}

}

JavaInfo:

public class JavaInfo {

	private final String version;

	private final JavaVendorInfo vendor;

	private final JavaRuntimeEnvironmentInfo runtime;

	private final JavaVirtualMachineInfo jvm;

	public JavaInfo() {
		this.version = System.getProperty("java.version");
		this.vendor = new JavaVendorInfo();
		this.runtime = new JavaRuntimeEnvironmentInfo();
		this.jvm = new JavaVirtualMachineInfo();
	}

	public String getVersion() {
		return this.version;
	}

	public JavaVendorInfo getVendor() {
		return this.vendor;
	}

	public JavaRuntimeEnvironmentInfo getRuntime() {
		return this.runtime;
	}

	public JavaVirtualMachineInfo getJvm() {
		return this.jvm;
	}

	/**
	 * Information about the Java Vendor of the Java Runtime the application is running
	 * in.
	 *
	 * @since 2.7.0
	 */
	public static class JavaVendorInfo {

		private final String name;

		private final String version;

		public JavaVendorInfo() {
			this.name = System.getProperty("java.vendor");
			this.version = System.getProperty("java.vendor.version");
		}

		public String getName() {
			return this.name;
		}

		public String getVersion() {
			return this.version;
		}

	}

	/**
	 * Information about the Java Runtime Environment the application is running in.
	 */
	public static class JavaRuntimeEnvironmentInfo {

		private final String name;

		private final String version;

		public JavaRuntimeEnvironmentInfo() {
			this.name = System.getProperty("java.runtime.name");
			this.version = System.getProperty("java.runtime.version");
		}

		public String getName() {
			return this.name;
		}

		public String getVersion() {
			return this.version;
		}

	}

	/**
	 * Information about the Java Virtual Machine the application is running in.
	 */
	public static class JavaVirtualMachineInfo {

		private final String name;

		private final String vendor;

		private final String version;

		public JavaVirtualMachineInfo() {
			this.name = System.getProperty("java.vm.name");
			this.vendor = System.getProperty("java.vm.vendor");
			this.version = System.getProperty("java.vm.version");
		}

		public String getName() {
			return this.name;
		}

		public String getVendor() {
			return this.vendor;
		}

		public String getVersion() {
			return this.version;
		}

	}

}

osinfo:

public class OsInfo {

	private final String name;

	private final String version;

	private final String arch;

	public OsInfo() {
		this.name = System.getProperty("os.name");
		this.version = System.getProperty("os.version");
		this.arch = System.getProperty("os.arch");
	}

	public String getName() {
		return this.name;
	}

	public String getVersion() {
		return this.version;
	}

	public String getArch() {
		return this.arch;
	}

}

最后

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