基于SpringBoot和MybatisPlus实现通用Controller，只需要创建实体类和mapper接口，单表增删改查接口就已经实现，提升开发效率

1.定义通用controller

package com.xian.controller;


import cn.hutool.core.map.MapUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.xian.common.alias.*;
import com.xian.common.result.Result;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.web.bind.annotation.*;
import java.io.Serializable;
import java.util.Collection;
import java.util.List;

@RestController
@RequestMapping("/api/v1/data")
public class BaseController<T extends Serializable> {
    @Autowired
    private ApplicationContext applicationContext;

    private T entity;

    // 使用泛型和IService来处理通用CRUD操作
    protected <S extends BaseMapper<T>> S getMapper(String entityName) throws Exception {
        String serviceName = entityName + "Mapper"; // 假设服务名与实体名相同
        return (S) applicationContext.getBean(serviceName);
    }

    @GetMapping("/{entityName}/get/{id}")
    public Result get(@PathVariable String entityName, @PathVariable Long id) throws Exception {
        BaseMapper<T> mapper = getMapper(entityName);
        return Result.success(mapper.selectById(id));
    }

    @GetMapping("/{entityName}/all")
    public Result get(@PathVariable String entityName) throws Exception {
        BaseMapper<T> mapper = getMapper(entityName);
        return Result.success(mapper.selectList(new QueryWrapper<>()));
    }


    @PostMapping("/{entityName}/insert")
    public Result insert(@PathVariable String entityName,@RequestBody T entity) throws Exception {
        BaseMapper<T> baseMapper =  getMapper(entityName);
        ValidateService<T> validateService = new ValidateServiceImpl<>();
        validateService.validate(entity,baseMapper);
        baseMapper.insert(entity);
        return Result.success();
    }
    @PutMapping("/{entityName}/update")
    public Result update(@PathVariable String entityName,@RequestBody T entity) throws Exception {
        BaseMapper<T> baseMapper =  getMapper(entityName);
        // 使用Spring注入验证服务
        // 验证数据
        ValidateService<T> validateService = new ValidateServiceImpl<>();
        validateService.validate(entity, baseMapper);
        baseMapper.updateById(entity);
        return Result.success();
    }


    @PutMapping("/{entityName}/delete/{id}")
    public Result update(@PathVariable String entityName,@PathVariable Long id) throws Exception {
        BaseMapper<T> baseMapper =  getMapper(entityName);
        baseMapper.deleteById(id);
        return Result.success();
    }


    @PutMapping("/{entityName}/deleteByIds")
    public Result update(@PathVariable String entityName,@RequestBody Collection<Long> ids) throws Exception {
        BaseMapper<T> baseMapper =  getMapper(entityName);
        baseMapper.deleteBatchIds(ids);
        return Result.success();
    }

    // 可以添加其他通用的增删改查方法...
    @PostMapping("/{entityName}/list")
    public Result update(@PathVariable String entityName, @RequestBody PageRequestVo pageRequest) throws Exception {
        BaseMapper<T> baseMapper =  getMapper(entityName);
        System.out.println("pageRequest = " + pageRequest);
        PageHelper.startPage(pageRequest.getPage(), pageRequest.getSize());
        QueryWrapper<T> queryWrapper = new QueryWrapper<>();
        List<String> sort = pageRequest.getSorts();
        if (sort!=null&& !sort.isEmpty()) {
            sort.forEach(o -> {
                if (o.endsWith("Asc")) {
                    queryWrapper.orderByAsc(o.replace("Asc", ""));
                }else if (o.endsWith("Desc")) {
                    queryWrapper.orderByDesc(o.replace("Desc", ""));
                }else {
                    queryWrapper.orderByAsc(o);
                }
            });
        }
        if (!MapUtil.isEmpty(pageRequest.getParams())){
            // 处理查询参数
            pageRequest.getParams().forEach((field, values) -> {
                if (values != null && !values.isEmpty()) {
                    if (field.endsWith("Like")) {
                        for (Object value : values) {
                            queryWrapper.like(field.replace("Like",""), value);
                        }
                    }else if (field.endsWith("Is")){
                        for (Object value : values) {
                            queryWrapper.eq(field.replace("Like",""), value);
                        }
                    }else if (field.endsWith("Between")){
                        queryWrapper.between(field.replace("Between",""), values.get(0), values.get(1));
                    }else if (field.endsWith("IsNull")){
                        queryWrapper.isNull(field.replace("IsNull",""));
                    }else if (field.endsWith("IsNotNull")){
                        queryWrapper.isNotNull(field.replace("IsNotNull",""));
                    }else if (field.endsWith("NotIn")){
                        queryWrapper.notIn(field.replace("NotIn",""), values);
                    }else if (field.endsWith("In")){
                        queryWrapper.in(field.replace("In",""), values);
                    }else if (field.endsWith("Gt")){
                        queryWrapper.gt(field.replace("Gt",""), values.get(0));
                    }else if (field.endsWith("Ge")){
                        queryWrapper.ge(field.replace("Ge",""), values.get(0));
                    }else if (field.endsWith("Lt")){
                        queryWrapper.lt(field.replace("Lt",""), values.get(0));
                    }else if (field.endsWith("Le")){
                        queryWrapper.le(field.replace("Le",""), values.get(0));
                    }else if (field.endsWith("Eq")){
                        for (Object value : values) {
                            queryWrapper.eq(field.replace("Eq",""), value);
                        }
                    }else if (field.endsWith("Ne")){
                        queryWrapper.ne(field.replace("Ne",""), values.get(0));
                    }else if (field.endsWith("NotBetween")){
                        queryWrapper.notBetween(field.replace("NotBetween",""), values.get(0), values.get(1));
                    }else {
                        for (Object value : values) {
                            queryWrapper.eq(field, value);
                        }
                    }
                }
            });
        }
        return Result.success(PageInfo.of(baseMapper.selectList(queryWrapper)));
    }

}

2.创建业务实体和mapper接口，

@EqualsAndHashCode(callSuper = true)
@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
public class User extends Account {

    @TableId(type = IdType.AUTO)
    private Integer id;
    private String username;
    private String password;
    private String name;
    private String avatar;
    private String role;
    private String sex;
    private String phone;
    private String email;
    private String info;
    private String birth;

    @TableField(exist = false)
    private Integer blogCount;
    @TableField(exist = false)
    private Integer likesCount;
    @TableField(exist = false)
    private Integer collectCount;

}

mapper接口：

@Mapper
public interface UserMapper extends BaseMapper<User> {
}

postman测试