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Maven项目通过package打成jar包后#xff0c;jar包中包含所有依赖lib文件。本文介绍了两种方式解析嵌套jar中的class文件#xff0c;一种是通过spring-boot-loader包JarFileArchive#xff0c;另一种是util包中JarFile。
二、JarFileArchive方式
1.spring-boot-…一、简述
Maven项目通过package打成jar包后jar包中包含所有依赖lib文件。本文介绍了两种方式解析嵌套jar中的class文件一种是通过spring-boot-loader包JarFileArchive另一种是util包中JarFile。
二、JarFileArchive方式
1.spring-boot-loader依赖引入
dependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-loader/artifactIdversion2.2.4.RELEASE/version
/dependency 2.demo案例 public static void main(String args[]) throws Exception {String jarPath C:\\Users\\root\\Desktop\\make-test.jar;// 方案一spring-boot-loaderlong start1 System.currentTimeMillis();getClassInfoByJarLib(jarPath);long end1 System.currentTimeMillis();log.info(收集所有lib类ClassInfo,花费时间{},(end1-start1));} public static void getClassInfoByJarLib(String jarPath) {String filePath file:/ URLDecoder.decode(jarPath, StandardCharsets.UTF_8).replaceAll(\\\\,/)!/;String rootJarPath jar: filePath;try {JarFileArchive jarFileArchive new JarFileArchive(new Handler().getRootJarFileFromUrl(new URL(rootJarPath)));//getNestedArchives获取嵌套的jar等文件参数是个EntryFilter过滤条件jarFileArchive.getNestedArchives(entry - entry.getName().startsWith(BOOT-INF/lib/) entry.getName().endsWith(.jar)).forEach(archive - {archive.iterator().forEachRemaining(entry - {String entryName entry.getName();// 过滤嵌套jar包中字节码文件if (entryName.endsWith(.class)) {String className entryName.replace(/, .).replace(.class, );log.info(className:{},className);}});});} catch (IOException e) {log.error(解析嵌套jarLib中ClassInfo异常jarPath{},jarPath,e);throw new RuntimeException(e);}}
三、JarFile方式
1.demo案例 public static void main(String args[]) throws Exception {String jarPath C:\\Users\\root\\Desktop\\make-test.jar;// 方案二JarFilelong start2 System.currentTimeMillis();processJar(jarPath);long end2 System.currentTimeMillis();log.info(收集所有lib类ClassInfo,花费时间{},(end2-start2));} private static void processJar(String jarPath){try (JarFile jarFile new JarFile(new File(jarPath))) {jarFile.stream().parallel()// 过滤出所有符合要求的jar包.filter(entry - !entry.isDirectory() entry.getName().startsWith(BOOT-INF/lib/) entry.getName().endsWith(.jar)).forEach(entry - processNestedJar(jarFile, entry.getName()));} catch (IOException e) {log.error(解析嵌套jarLib中ClassInfo异常jarPath{},jarPath,e);throw new RuntimeException(e);}}private static void processNestedJar(JarFile jarFile, String entryName){// 处理嵌套jar文件try (InputStream nestedJarStream jarFile.getInputStream(jarFile.getJarEntry(entryName));JarInputStream jarInputStream new JarInputStream(nestedJarStream)) {JarEntry nestedEntry;while ((nestedEntry jarInputStream.getNextJarEntry()) ! null) {if (nestedEntry.isDirectory()) {continue;}String nestedEntryName nestedEntry.getName();if (!nestedEntryName.endsWith(.class)) {continue;}try {String className nestedEntryName.replace(/, .).replace(.class, );log.info(className:{},className);} catch (Exception e) {log.error(目标类{}查找失败,nestedEntryName,e);throw new RuntimeException(e);}}} catch (IOException e) {log.error(目标类{}查找失败,entryName,e);throw new RuntimeException(e);}}
四、两种方式对比
实测项目make-test.jar中所有依赖lib约200个其中所有class字节码文件约7万多个。方案JarFileArchive约1.5s全部解析方案JarFile约6s全部解析。
