java - 从具有特殊格式的 JAR 中提取类名

Question

我如何从一个 Jar 文件中提取所有可用的类，并在一些简单的处理后将输出转储到一个 txt 文件中。

例如，如果我运行 jar tf commons-math3-3.1.6.jar，输出的一个子集将是:

org/apache/commons/math3/analysis/differentiation/UnivariateVectorFunctionDifferentiator.class
org/apache/commons/math3/analysis/differentiation/FiniteDifferencesDifferentiator$2.class
org/apache/commons/math3/analysis/differentiation/SparseGradient$1.class
org/apache/commons/math3/analysis/integration/IterativeLegendreGaussIntegrator$1.class
org/apache/commons/math3/analysis/integration/gauss/LegendreHighPrecisionRuleFactory.class
org/apache/commons/math3/analysis/integration/gauss/BaseRuleFactory.class
org/apache/commons/math3/analysis/integration/gauss/HermiteRuleFactory.class
org/apache/commons/math3/analysis/integration/gauss/LegendreRuleFactory.class
org/apache/commons/math3/analysis/integration/gauss/GaussIntegratorFactory.class

我想将所有 / 转换为 。

所有 $ 到 。

最后，我还想删除出现在每个字符串末尾的 .class。

例如:

org/apache/commons/math3/analysis/differentiation/FiniteDifferencesDifferentiator$2.class

会变成

org.apache.commons.math3.analysis.differentiation.FiniteDifferencesDifferentiator.2

Answer 1

String path = "org/apache/commons/math3/analysis/integration/gauss/BaseRuleFactory.class";
path = path.replaceAll("/", ".")
           .replaceAll("\\$(\\d+)\\.class", "\\.$1");