#Java篇：java项目init和写接口流程步骤详细

idea里面 file—new-project

Server url

https://start.aliyun.com

目录结构

数据库链接项目配置

application.yml

server:port: 8888
spring:datasource:url: jdbc:mysql://localhost:3306/test1?useUnicode=true&characterEncoding=UTF-8username: rootpassword: rootdriver-class-name: com.mysql.cj.jdbc.Driver

主要目录

controller

service

impl实现类

model

mapper

java接口详细描述

创建文件顺序

model—Role
mapper—RoleMapper 继承Role
service----IRoleService 继承Role
service(impl)—RoleServiceImpl 实现IRoleService
controller—RoleController 实现接口返回前端

model—Role

// model---Role
package com.xiaolibao.javacxyxiaolibao.model;import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;@TableName("role_info")
@Data
public class Role {private String id;private String name;private String phone;
}

mapper—RoleMapper

// mapper---RoleMapper
package com.xiaolibao.javacxyxiaolibao.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.xiaolibao.javacxyxiaolibao.model.Role;
import org.apache.ibatis.annotations.Mapper;@Mapper
public  interface RoleMapper extends BaseMapper<Role> {}

service----IRoleService

// service----IRoleService 继承Role
package com.xiaolibao.javacxyxiaolibao.service;import com.baomidou.mybatisplus.extension.service.IService;
import com.xiaolibao.javacxyxiaolibao.model.Role;import java.util.List;public interface IRoleService extends IService<Role>  {List<Role> test();
}

impl— RoleServiceImpl

// RoleServiceImpl 实现IRoleService
package com.xiaolibao.javacxyxiaolibao.service.impl;import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.xiaolibao.javacxyxiaolibao.mapper.RoleMapper;
import com.xiaolibao.javacxyxiaolibao.model.Role;
import com.xiaolibao.javacxyxiaolibao.service.IRoleService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.util.List;@Service
public class RoleServiceImpl extends ServiceImpl<RoleMapper, Role> implements IRoleService {@Autowiredprivate RoleMapper roleMapper;@Overridepublic List<Role> test() {List<Role> roles = roleMapper.selectList(null);return roles;}
}

####controller— RoleController

// RoleController 实现接口返回前端
package com.xiaolibao.javacxyxiaolibao.controller;import com.xiaolibao.javacxyxiaolibao.model.Role;
import com.xiaolibao.javacxyxiaolibao.service.IRoleService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.util.List;@RestController
@RequestMapping("/role")
public class RoleController {@Autowiredprivate IRoleService roleService;@GetMapping("/test")public List<Role> test(){List<Role> test = roleService.test();return  test;}
}