java如何使用javaparser获取类级变量名？

Question

我能够使用以下代码获得类级变量的声明。但我只需要变量名。这是以下代码的输出-[private boolean flag=true；]

import com.github.javaparser.JavaParser;
import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.body.ClassOrInterfaceDeclaration;
import com.github.javaparser.ast.visitor.VoidVisitorAdapter;
import java.io.FileInputStream;

public class CuPrinter{
    public static void main(String[] args) throws Exception {
        // creates an input stream for the file to be parsed
        FileInputStream in = new FileInputStream("C:\\Users\\arosh\\IdeaProjects\\Bot_Twitter\\src\\MyBot.java");

        CompilationUnit cu;
        try {
            // parse the file
            cu = JavaParser.parse(in);
        } finally {
            in.close();
        }
        cu.accept(new ClassVisitor(), null);
}
private static class ClassVisitor extends VoidVisitorAdapter<Void> {
    @Override
    public void visit(ClassOrInterfaceDeclaration n, Void arg) {
        /* here you can access the attributes of the method.
         this method will be called for all methods in this
         CompilationUnit, including inner class methods */
        System.out.println(n.getFields());
        super.visit(n, arg);
    }
  }
}

Answer 1

您可以使用以下简单的正则表达式：

final String regex = "^((private|public|protected)?\\s+)?.*\\s+(\\w+);$";

然后可以将其编译成Pattern：

final Pattern pattern = Pattern.compile(regex);

然后最后在for-loop中使用：

for(final String field : n.getFields()){
    // create a regex-matcher
    final Matcher matcher = pattern.matcher(field);

    // if field matches regex
    if(matcher.matches()){
        // get the last group -> the fieldName
        final String name = matcher.group(matcher.groupCount());
        System.out.println("FieldName: " + name);
    }
}

Answer 2

你可以试试这个。如果FieldDeclarations中有多个变量，请在内部使用多个for循环

public void visit(ClassOrInterfaceDeclaration n, Void arg) {

    super.visit(n, arg);
    for(FieldDeclaration ff:n.getFields())
    {
        System.out.println(ff.getVariable(0).getName());
    }
}