列出javac编译的Java源文件

Question

我有一系列通过 CLASSPATH 引用大型代码存储库的小型 Java 项目（*.java 文件中的类）。代码存储库包含大量 *.java 文件（源文件）和一些 *.jar 文件。我想将任何给定的项目与其目录分开，以便打包并分发它。

给定一个包含 main 方法的 Java 类作为给定项目的起点，如何列出 CLASSPATH 上用于编译给定 Java 的所有文件，例如 *.java 文件或 *.jar 文件班级？ javac可以在编译过程中产生一个足够详细的日志吗？你能单独使用 Java API 并以编程方式检查用于编译的源文件吗？

Answer 1

javac 能否在编译过程中生成包含足够详细信息的日志？

javac 有 -verbose 选项，它可以告诉您哪些 JAR 位于类路径以及哪些 Java 文件已编译。

javac -verbose <filepath>

示例输出（编译使用 Dummy2.java 和一些 JDK 类的 Dummy.java）：

[parsing started RegularFileObject[Dummy.java]]
[parsing completed 10ms]
[search path for source files: .]
[search path for class files: C:\Program Files\Java\jdk1.7.0_80\jre\lib\resources.jar,C:\Program Files\Java\jdk1.7.0_80\jre\lib\rt.jar,C:\Program Files\Java\jdk1.7.0_80\jre\lib\sunrsasign.jar,C:\Program Files\Java\jdk1.7.0_80\jre\lib\jsse.jar,C:\Program Files\Java\jdk1.7.0_80\jre\lib\jce.jar,C:\Program Files\Java\jdk1.7.0_80\jre\lib\charsets.jar,C:\Program Files\Java\jdk1.7.0_80\jre\lib\jfr.jar,C:\Program Files\Java\jdk1.7.0_80\jre\classes,C:\Program Files\Java\jdk1.7.0_80\jre\lib\ext\access-bridge-64.jar,C:\Program Files\Java\jdk1.7.0_80\jre\lib\ext\dnsns.jar,C:\Program Files\Java\jdk1.7.0_80\jre\lib\ext\jaccess.jar,C:\Program Files\Java\jdk1.7.0_80\jre\lib\ext\localedata.jar,C:\Program Files\Java\jdk1.7.0_80\jre\lib\ext\sunec.jar,C:\Program Files\Java\jdk1.7.0_80\jre\lib\ext\sunjce_provider.jar,C:\Program Files\Java\jdk1.7.0_80\jre\lib\ext\sunmscapi.jar,C:\Program Files\Java\jdk1.7.0_80\jre\lib\ext\zipfs.jar,.]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.7.0_80\lib\ct.sym(META-INF/sym/rt.jar/java/io/File.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.7.0_80\lib\ct.sym(META-INF/sym/rt.jar/java/lang/Object.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.7.0_80\lib\ct.sym(META-INF/sym/rt.jar/java/lang/String.class)]]
[checking Dummy]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.7.0_80\lib\ct.sym(META-INF/sym/rt.jar/java/lang/AutoCloseable.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.7.0_80\lib\ct.sym(META-INF/sym/rt.jar/java/net/URI.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.7.0_80\lib\ct.sym(META-INF/sym/rt.jar/java/lang/System.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.7.0_80\lib\ct.sym(META-INF/sym/rt.jar/java/io/PrintStream.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.7.0_80\lib\ct.sym(META-INF/sym/rt.jar/java/io/FilterOutputStream.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.7.0_80\lib\ct.sym(META-INF/sym/rt.jar/java/io/OutputStream.class)]]
[loading RegularFileObject[.\Dummy2.java]]
[parsing started RegularFileObject[.\Dummy2.java]]
[parsing completed 0ms]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.7.0_80\lib\ct.sym(META-INF/sym/rt.jar/java/lang/StringBuilder.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.7.0_80\lib\ct.sym(META-INF/sym/rt.jar/java/lang/CharSequence.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.7.0_80\lib\ct.sym(META-INF/sym/rt.jar/java/io/Serializable.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.7.0_80\lib\ct.sym(META-INF/sym/rt.jar/java/lang/Comparable.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.7.0_80\lib\ct.sym(META-INF/sym/rt.jar/java/lang/AbstractStringBuilder.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.7.0_80\lib\ct.sym(META-INF/sym/rt.jar/java/lang/StringBuffer.class)]]
[wrote RegularFileObject[Dummy.class]]
[checking Dummy2]
[wrote RegularFileObject[.\Dummy2.class]]
[total 257ms]