使用eclipse解析java代码语法树

maven依赖

        <dependency>
            <groupId>org.eclipse.core</groupId>
            <artifactId>org.eclipse.core.resources</artifactId>
            <version>3.7.100</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.tycho</groupId>
            <artifactId>org.eclipse.jdt.core</artifactId>
            <version>3.11.1.v20150902-1521</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

代码

@Slf4j
class JDKParser {
    // https://blog.youkuaiyun.com/weixin_36431280/article/details/80717296
    public static void main(String[] args) {
        ASTParser parser = ASTParser.newParser(AST.JLS4); //设置Java语⾔规范版本
        parser.setKind(ASTParser.K_COMPILATION_UNIT);
        Map<String, String> compilerOptions = JavaCore.getOptions();
        compilerOptions.put(JavaCore.COMPILER_COMPLIANCE, JavaCore.VERSION_1_8); //设置Java语⾔版本
        compilerOptions.put(JavaCore.COMPILER_CODEGEN_TARGET_PLATFORM, JavaCore.VERSION_1_8);
        compilerOptions.put(JavaCore.COMPILER_SOURCE, JavaCore.VERSION_1_8);
        parser.setCompilerOptions(compilerOptions); //设置编译选项
        char[] src = FileUtil.readString(
            "E:\\Data\\Git\\mygit\\skb\\SKB_Report_Sync\\src\\main\\test\\java\\MyTask.java", Charset.defaultCharset())
            .toCharArray();
        parser.setSource(src);
        CompilationUnit comp = (CompilationUnit) parser.createAST(
            null);//这个参数是IProgessMonitor,⽤于GUI的进度显⽰,我们不需要，填个null. 返回值是AST的根结点
        System.out.println(comp); //把AST直接输出看看啥样
        List<Comment> commentList = comp.getCommentList();
        Comment comment = commentList.get(0);
        log.info("commentList: {}", commentList);
        // 获取类
        List<TypeDeclaration> types = comp.types();
        log.info("types: {}", types);
        // 获取方法
        MethodDeclaration[] methods = types.get(0).getMethods();
        SimpleName name = methods[0].getName();
        int startPosition1 = methods[0].getStartPosition();
        int endposition = methods[0].getLength() + startPosition1;
        int startLineNum = comp.getLineNumber(startPosition1);
        int endLineNum = comp.getLineNumber(endposition);
        log.info("methodname: {}", name);
        log.info("startPosition1: {}", startPosition1);
        log.info("startLineNum: {}, endLineNum: {}", startLineNum, endLineNum);

        int startPosition = comment.getStartPosition();
        int endPosition = startPosition + comment.getLength();

        log.info("start: {}, end: {}", startPosition, endPosition);
    }
}