spring SpringVersion 源码
spring SpringVersion 代码
文件路径：/spring-core/src/main/java/org/springframework/core/SpringVersion.java
/*
* Copyright 2002-2019 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.core;
import org.springframework.lang.Nullable;
/**
* Class that exposes the Spring version. Fetches the
* "Implementation-Version" manifest attribute from the jar file.
*
* <p>Note that some ClassLoaders do not expose the package metadata,
* hence this class might not be able to determine the Spring version
* in all environments. Consider using a reflection-based check instead —
* for example, checking for the presence of a specific Spring 5.2
* method that you intend to call.
*
* @author Juergen Hoeller
* @since 1.1
*/
public final class SpringVersion {
private SpringVersion() {
}
/**
* Return the full version string of the present Spring codebase,
* or {@code null} if it cannot be determined.
* @see Package#getImplementationVersion()
*/
@Nullable
public static String getVersion() {
Package pkg = SpringVersion.class.getPackage();
return (pkg != null ? pkg.getImplementationVersion() : null);
}
}
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