package tech.powerjob.common.utils;
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import lombok.extern.slf4j.Slf4j;
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import java.io.File;
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import java.io.IOException;
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import java.net.JarURLConnection;
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import java.net.URL;
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import java.net.URLConnection;
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import java.security.CodeSource;
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import java.util.jar.Attributes;
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import java.util.jar.JarFile;
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/**
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* Java 语言相关的工具
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*
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* @author tjq
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* @since 2022/10/23
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*/
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@Slf4j
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public class JavaUtils {
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/**
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* 获取类所在 Jar 包的版本
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* @param clz 类
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* @return 包版本
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*/
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public static String determinePackageVersion(Class<?> clz) {
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try {
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String implementationVersion = clz.getPackage().getImplementationVersion();
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if (implementationVersion != null) {
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return implementationVersion;
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}
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CodeSource codeSource = clz.getProtectionDomain().getCodeSource();
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if (codeSource == null) {
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return null;
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}
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URL codeSourceLocation = codeSource.getLocation();
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URLConnection connection = codeSourceLocation.openConnection();
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if (connection instanceof JarURLConnection) {
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return getImplementationVersion(((JarURLConnection) connection).getJarFile());
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}
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final File file = new File(codeSourceLocation.toURI());
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// idea 场景，查找版本失败
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if (!file.exists() || file.isDirectory()) {
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return "UNKNOWN";
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}
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try (JarFile jarFile = new JarFile(file)) {
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return getImplementationVersion(jarFile);
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}
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}
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catch (Throwable t) {
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log.warn("[JavaUtils] determinePackageVersion for clz[{}] failed, msg: {}", clz.getSimpleName(), t.toString());
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// windows 下无权限访问会一直报错一直重试，需要在此兼容
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return "UNKNOWN";
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}
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}
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private static String getImplementationVersion(JarFile jarFile) throws IOException {
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return jarFile.getManifest().getMainAttributes().getValue(Attributes.Name.IMPLEMENTATION_VERSION);
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}
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}
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