Java递归如何实现菜单树

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pom文件

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <!--  可选修改：之前的一些案例按照此版本搭建      -->        <version>2.1.3.RELEASE</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>    <groupId>com.example</groupId>    <artifactId>demo</artifactId>    <version>0.0.1-SNAPSHOT</version>    <name>demo</name>    <description>Demo project for Spring Boot</description>    <properties>        <java.version>1.8</java.version>    </properties>    <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-thymeleaf</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>        <!--  spring boot 整合mybatis的核心依赖-->        <dependency>            <groupId>org.mybatis.spring.boot</groupId>            <artifactId>mybatis-spring-boot-starter</artifactId>            <version>2.1.1</version>        </dependency>        <!--        数据库驱动-->        <dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>            <scope>runtime</scope>        </dependency>        <!--pageHelper分页插件-->        <dependency>            <groupId>com.github.pagehelper</groupId>            <artifactId>pagehelper-spring-boot-starter</artifactId>            <version>1.3.0</version>        </dependency>        <!-- 引入lombok，简化pojo类-->        <dependency>            <groupId>org.projectlombok</groupId>            <artifactId>lombok</artifactId>            <optional>true</optional>        </dependency>        <!--        引入Mybatis plus 依赖  增强mybatis-->        <dependency>            <groupId>com.baomidou</groupId>            <artifactId>mybatis-plus-boot-starter</artifactId>            <version>3.4.2</version>        </dependency>    </dependencies>    <build>        <plugins>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>            </plugin>        </plugins>    </build></project>

 application.yaml文件

spring:  datasource:       url: jdbc:mysql://localhost:3306/springboot?useUnicode=true&characterEncoding=utf-8&serverTimezone=CTT    username: root    password: 2020    driver-class-name: com.mysql.cj.jdbc.Driverpagehelper:  helperDialect: mysql  reasonable: true # 修改默认值# mybatis-plus配置mybatis-plus:  configuration:    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl  typeAliasesPackage: com.qcby.entity  mapperLocations: classpath:mapper    public List<Menu> iterateMenus(List<Menu> menuVoList,String pid){        List<Menu> result = new ArrayList<Menu>();        for (Menu menu : menuVoList) {            //获取菜单的id            String menuid = menu.getId();            //获取菜单的父id            String parentid = menu.getPid();            if(StringUtils.isNotBlank(parentid)){                if(parentid.equals(pid)){                    //递归查询当前子菜单的子菜单                    List<Menu> iterateMenu = iterateMenus(menuVoList,menuid);                    menu.setMenuChildren(iterateMenu);                    result.add(menu);                }            }        }        return result;    }}

结果展示

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