springBoot和mybaitsplus实现供管理后台使用的用户列表(列表中需要显示余额、做分页)、编辑、删除接口。(必做)

好的，下面是详细的实现步骤：

1. 在Maven项目中添加Spring Boot和Mybatis Plus的依赖，在pom.xml文件中添加以下依赖：

<dependencies>
    <!-- Spring Boot -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <!-- Mybatis Plus -->
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-boot-starter</artifactId>
        <version>3.4.3.1</version>
    </dependency>

    <!-- MySQL 驱动 -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.25</version>
    </dependency>
</dependencies>

2. 创建用户表，并使用Mybatis Plus的注解进行表映射。在src/main/java目录下创建一个com.example.entity包，创建User实体类：

package com.example.entity;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

@Data
@TableName("user")
public class User {
    @TableId(value = "id", type = IdType.AUTO)
    private Long id;

    @TableField(value = "username")
    private String username;

    @TableField(value = "password")
    private String password;

    @TableField(value = "balance")
    private Double balance;
}

3. 创建UserMapper接口，继承Mybatis Plus提供的BaseMapper接口，用于提供基本的增删改查操作。在src/main/java目录下创建一个com.example.mapper包，创建UserMapper接口：

package com.example.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.example.entity.User;

public interface UserMapper extends BaseMapper<User> {
}

4. 创建UserService类，实现用户列表、编辑、删除等业务逻辑。在src/main/java目录下创建一个com.example.service包，创建UserService类：

package com.example.service;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.entity.User;
import com.example.mapper.UserMapper;
import org.springframework.stereotype.Service;

@Service
public class UserService extends ServiceImpl<UserMapper, User> {
    public Page<User> getUserList(int pageNum, int pageSize) {
        Page<User> page = new Page<>(pageNum, pageSize);
        QueryWrapper<User> wrapper = new QueryWrapper<>();
        wrapper.orderByAsc("id");
        return baseMapper.selectPage(page, wrapper);
    }

    public User getUserById(Long id) {
        return baseMapper.selectById(id);
    }

    public void saveUser(User user) {
        baseMapper.insert(user);
    }

    public void updateUser(User user) {
        baseMapper.updateById(user);
    }

    public void deleteUser(Long id) {
        baseMapper.deleteById(id);
    }
}

5. 创建UserController类，提供RESTful接口，用于前端页面调用。在src/main/java目录下创建一个com.example.controller包，创建UserController类：

package com.example.controller;

import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.example.entity.User;
import com.example.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("/users")
public class UserController {
    @Autowired
    private UserService userService;

    @GetMapping("")
    public Page<User> getUserList(@RequestParam(defaultValue = "1") int pageNum,
                                  @RequestParam(defaultValue = "10") int pageSize) {
        return userService.getUserList(pageNum, pageSize);
    }

    @GetMapping("/{id}")
    public User getUserById(@PathVariable Long id) {
        return userService.getUserById(id);
    }

    @PostMapping("")
    public void saveUser(@RequestBody User user) {
        userService.saveUser(user);
    }

    @PutMapping("/{id}")
    public void updateUser(@PathVariable Long id, @RequestBody User user) {
        user.setId(id);
        userService.updateUser(user);
    }

    @DeleteMapping("/{id}")
    public void deleteUser(@PathVariable Long id) {
        userService.deleteUser(id);
    }
}

6. 在src/main/resources/application.properties文件中添加数据库连接配置：

spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

mybatis-plus.mapper-locations=classpath:mapper/*.xml

7. 在启动类中添加注解@EnableTransactionManagement，开启事务管理。在src/main/java目录下创建一个com.example包，创建启动类Application：

package com.example;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@EnableTransactionManagement
@SpringBootApplication
@MapperScan("com.example.mapper")
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

8. 在前端页面中，使用Vue或React等框架，调用后端接口，实现用户列表的展示、编辑、删除等操作。

希望这些步骤能够对您有所帮助，如果还有其他问题，可以随时继续提问。