Java：解析java源代码，提取方法
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Java : parse java source code, extract methods
提问by glmxndr
I wish to parse java source code files, and extract the methods source code.
我想解析java源代码文件，并提取方法源代码。
I would need a method like this :
我需要一个这样的方法：
/** Returns a map with key = method name ; value = method source code */
Map<String,String> getMethods(File javaFile);
Is there a simple way to achieve this, a library to help me build my method, etc. ?
有没有一个简单的方法来实现这一点，一个库来帮助我构建我的方法等？
采纳答案by arcticfox
Download the java parser from https://javaparser.org/
从https://javaparser.org/下载 java 解析器
You'll have to write some code. This code will invoke the parser... it will return you a CompilationUnit:
您将不得不编写一些代码。此代码将调用解析器...它将返回一个 CompilationUnit：
InputStream in = null;
CompilationUnit cu = null;
try
{
in = new SEDInputStream(filename);
cu = JavaParser.parse(in);
}
catch(ParseException x)
{
// handle parse exceptions here.
}
finally
{
in.close();
}
return cu;
Note: SEDInputStream is a subclass of input stream. You can use a FileInputStream if you want.
注意：SEDInputStream 是输入流的子类。如果需要，您可以使用 FileInputStream。
You'll have to create a visitor. Your visitor will be easy because you're only interested in methods:
您必须创建一个访问者。您的访问者会很容易，因为您只对方法感兴趣：
public class MethodVisitor extends VoidVisitorAdapter
{
public void visit(MethodDeclaration n, Object arg)
{
// extract method information here.
// put in to hashmap
}
}
To invoke the visitor, do this:
要调用访问者，请执行以下操作：
MethodVisitor visitor = new MethodVisitor();
visitor.visit(cu, null);
回答by Rich
Could you use a custom doclet with JavaDoc?
您可以在 JavaDoc 中使用自定义 doclet 吗？
Doclet.commay provide more information.
Doclet.com可能会提供更多信息。
回答by unwind
回答by Upul Bandara
回答by Rorick
You can build your parser with one of parser generators:
您可以使用解析器生成器之一构建解析器：
Also, you can use (or study how it works) something ready-made. There are Java Tree Builderwhich uses JavaCC and RefactorItwhich uses ANTLR.
此外，您可以使用（或研究它是如何工作的）现成的东西。有使用 JavaCC 的Java Tree Builder和使用 ANTLR 的RefactorIt。
回答by Felix Leipold
QDOXis a more lightweight parser, that does only parse down to the method level, i.e. the method body is not being parsed into statements. It gives you more or less, what you ask for, even though the you would have navigate the model to find the right name, as it doesn't index classes and methods by name.
QDOX是一个更轻量级的解析器，它只解析到方法级别，即方法体不被解析为语句。它或多或少地为您提供所需的内容，即使您需要导航模型以找到正确的名称，因为它不会按名称对类和方法进行索引。
