Java递归实现菜单树

pom文件

    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        
        2.1.3.RELEASE
         
    
    com.example
    demo
    0.0.1-SNAPSHOT
    demo
    Demo project for Spring Boot
    
        1.8
    
    
        
            org.springframework.boot
            spring-boot-starter
        
        
            org.springframework.boot
            spring-boot-starter-web
        

        
            org.springframework.boot
            spring-boot-starter-thymeleaf
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            2.1.1
        
        
        
            mysql
            mysql-connector-java
            runtime
        

        
        
            com.github.pagehelper
            pagehelper-spring-boot-starter
            1.3.0
        
        
        
            org.projectlombok
            lombok
            true
        
        
        
            com.baomidou
            mybatis-plus-boot-starter
            3.4.2
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

 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.Driver

pagehelper:
  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 iterateMenus(List menuVoList,String pid){
        List result = new ArrayList();
        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 iterateMenu = iterateMenus(menuVoList,menuid);
                    menu.setMenuChildren(iterateMenu);
                    result.add(menu);
                }
            }
        }
        return result;
    }
}

结果展示