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需求

工作时有需求获取java文件成员变量的注释，故而研究了一系列开源产品，之所以选择JavaParse，是因为博客上文件比较多。。。

多归多，但也版本杂乱，走了不少歪路。

版本2.x和版本3.x还是有较大不同的，有需要的人可以参考。

版本2.x

<!-- https://mvnrepository.com/artifact/com.github.javaparser/javaparser-core -->
<dependency><groupId>com.github.javaparser</groupId><artifactId>javaparser-core</artifactId><version>2.2.1</version>
</dependency>

package cn.com.infosec.netseal.webserver.util;import cn.com.infosec.netseal.common.util.StringUtils;
import com.github.javaparser.JavaParser;
import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.Node;
import com.github.javaparser.ast.body.TypeDeclaration;
import com.github.javaparser.ast.comments.Comment;import java.io.File;
import java.util.List;public class JavaParseTest {public static void main(String[] args) throws Exception {String classPath = "E:\\Idea\\NetSeal\\v7\\src\\netseal\\netseal-common\\src\\main\\java\\cn\\com\\infosec\\netseal\\common\\resource\\errCode\\ErrSubType.java";String mapName = "subTypeMap";CompilationUnit parse = JavaParser.parse(new File(classPath));// 获取指定文件中的所有类List<TypeDeclaration> types = parse.getTypes();for (TypeDeclaration type : types) {// 获取类名/类注释String className = type.getName();type.getComment();// 获取类里的变量、方法等子节点List<Node> list = type.getChildrenNodes();System.out.println("总个数:" + list.size());for (Node node : list) {if (node.toString().indexOf("(") != -1)continue;// 获取变量的类型、变量名称和变量值；List<Node> varTypeAndKV = node.getChildrenNodes();Node varKV = varTypeAndKV.get(1);String varK = varKV.toString().split("=")[0].trim();// 获取变量注释String content = "";Comment comment = node.getComment();if (comment != null && comment.getContent() != "") {content = comment.getContent().replace("*", "").trim();}System.out.println(StringUtils.format("{}.put({}.{}, \"{}\");", mapName, className, varK, content));}}}
}

版本3.x

<dependency><groupId>com.github.javaparser</groupId><artifactId>javaparser-core</artifactId><version>3.6.16</version><scope>compile</scope>
</dependency>

package cn.com.infosec.netseal.appserver.util;import cn.com.infosec.netseal.common.util.StringUtils;
import com.alibaba.fastjson.JSON;
import com.github.javaparser.JavaParser;
import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.Node;
import com.github.javaparser.ast.NodeList;
import com.github.javaparser.ast.body.ClassOrInterfaceDeclaration;
import com.github.javaparser.ast.body.FieldDeclaration;
import com.github.javaparser.ast.body.TypeDeclaration;
import com.github.javaparser.ast.body.VariableDeclarator;
import com.github.javaparser.ast.comments.Comment;
import com.github.javaparser.ast.expr.SimpleName;import java.io.File;
import java.util.List;
import java.util.Optional;public class JavaParseTest {public static void main(String[] args) throws Exception {String classPath = "E:\\Idea\\NetSeal\\v7\\src\\netseal\\netseal-common\\src\\main\\java\\cn\\com\\infosec\\netseal\\common\\resource\\errCode\\ErrSubType.java";String mapName = "subTypeMap";CompilationUnit parse = JavaParser.parse(new File(classPath));Optional<ClassOrInterfaceDeclaration> errSubType = parse.getClassByName("ErrSubType");errSubType.ifPresent((c) -> {// 获取类名/类注释String className = c.getName().toString();c.getComment();// 获取类里的变量、方法等子节点List<Node> list = c.getChildNodes();System.out.println("总个数:" + list.size());for (Node nodeTmp : list) {if (!(nodeTmp instanceof FieldDeclaration))continue;FieldDeclaration node = (FieldDeclaration) nodeTmp;// 获取变量的类型、变量名称和变量值；VariableDeclarator variable = node.getVariable(0);String  varName = variable.getNameAsString();String  varType = variable.getTypeAsString();// 获取变量注释String content = "";Optional<Comment> comment = node.getComment();if (comment != null && comment.get().getContent() != "") {content = comment.get().getContent().replace("*", "").trim();}System.out.println(StringUtils.format("{}.put({}.{}, \"{}\");", mapName, className, varName, content));}});}
}