Java:解析java源代码,解压缩方法 [英] Java : parse java source code, extract methods
问题描述
我希望解析java源代码文件,并提取方法源代码。
I wish to parse java source code files, and extract the methods source code.
我需要这样的方法:
/** Returns a map with key = method name ; value = method source code */
Map<String,String> getMethods(File javaFile);
有没有一种简单的方法来实现这一点,一个库可以帮我构建我的方法等等?
Is there a simple way to achieve this, a library to help me build my method, etc. ?
推荐答案
从 http://javaparser.github.io/javaparser/
您必须编写一些代码。此代码将调用解析器...它将返回一个CompilationUnit:
You'll have to write some code. This code will invoke the parser... it will return you a 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;
注意:SEDInputStream是输入流的子类。如果需要,可以使用FileInputStream。
Note: SEDInputStream is a subclass of input stream. You can use a FileInputStream if you want.
您必须创建一个访问者。您的访问者很容易,因为您只对方法感兴趣:
You'll have to create a visitor. Your visitor will be easy because you're only interested in methods:
public class MethodVisitor extends VoidVisitorAdapter
{
public void visit(MethodDeclaration n, Object arg)
{
// extract method information here.
// put in to hashmap
}
}
要调用访问者,请执行以下操作:
To invoke the visitor, do this:
MethodVisitor visitor = new MethodVisitor();
visitor.visit(cu, null);
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