概述
富贵同学在用MybatisPlus作为开发的时候，虽然好用，但是大多数都在对dao层面的增删改查，所以打算自己抽取一套在controller层的功能出来，先介绍一下，“MybatisPlusPro” ：只要继承一个BaseController类，就可以拥有增删改查，查询列表，分页查询，排序，带参数查询，统计数量。话不多说，直接开始吧
第一步，引入MybatisPlus的jar包
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.4.2</version>
</dependency>
第二步，编写util类
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import org.springframework.util.ObjectUtils;
import org.springframework.util.ReflectionUtils;
import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Objects;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Apprentice系统Util
*
* @author MaSiyi
* @version 1.0.0 2021/11/26
* @since JDK 1.8.0
*/
public class ApprenticeUtil {
private static Pattern humpPattern = Pattern.compile("[A-Z]");
private static Pattern linePattern = Pattern.compile("_(\w)");
/**
* 驼峰转下划线
*
* @Param: [str]
* @return: java.lang.String
* @Author: MaSiyi
* @Date: 2021/11/26
*/
public static String humpToLine(String str) {
Matcher matcher = humpPattern.matcher(str);
StringBuffer sb = new StringBuffer();
while (matcher.find()) {
matcher.appendReplacement(sb, "_" + matcher.group(0).toLowerCase());
}
matcher.appendTail(sb);
return sb.toString();
}
/**
* 下划线转驼峰
*
* @Param: [str]
* @return: java.lang.String
* @Author: MaSiyi
* @Date: 2021/11/26
*/
public static String lineToHump(String str) {
str = str.toLowerCase();
Matcher matcher = linePattern.matcher(str);
StringBuffer sb = new StringBuffer();
while (matcher.find()) {
matcher.appendReplacement(sb, matcher.group(1).toUpperCase());
}
matcher.appendTail(sb);
return sb.toString();
}
/**
* 获取QueryWrapper
*
* @Param: [entity]
* @return: com.baomidou.mybatisplus.core.conditions.query.QueryWrapper<E>
* @Author: MaSiyi
* @Date: 2021/11/26
*/
public static <E> QueryWrapper<E> getQueryWrapper(E entity) {
Field[] fields = entity.getClass().getDeclaredFields();
QueryWrapper<E> eQueryWrapper = new QueryWrapper<>();
for (int i = 0; i < fields.length; i++) {
Field field = fields[i];
//忽略final字段
if (Modifier.isFinal(field.getModifiers())) {
continue;
}
field.setAccessible(true);
try {
Object obj = field.get(entity);
if (!ObjectUtils.isEmpty(obj)) {
String name = ApprenticeUtil.humpToLine(field.getName());
eQueryWrapper.eq(name, obj);
}
} catch (IllegalAccessException e) {
return null;
}
}
return eQueryWrapper;
}
/** 反射获取字段值
* @Param: [entity, value] value 值为 "id" "name" 等
* @return: java.lang.Object
* @Author: MaSiyi
* @Date: 2021/11/26
*/
public static <E> Object getValueForClass(E entity,String value) {
Field id = null;
PropertyDescriptor pd = null;
try {
id = entity.getClass().getDeclaredField(value);
pd = new PropertyDescriptor(id.getName(), entity.getClass());
} catch (NoSuchFieldException | IntrospectionException e) {
e.printStackTrace();
}
//获取get方法
Method getMethod = Objects.requireNonNull(pd).getReadMethod();
return ReflectionUtils.invokeMethod(getMethod, entity);
}
}
第三步，我们编写BaseController类
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.IService;
import com.wangfugui.apprentice.common.util.ApprenticeUtil;
import com.wangfugui.apprentice.common.util.ResponseUtils;
import com.wangfugui.apprentice.dao.dto.PageParamDto;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestParam;
import java.util.List;
/** 核心公共controller类
* @Param:
* @return:
* @Author: MaSiyi
* @Date: 2021/11/26
*/
public class BaseController<S extends IService<E>, E> {
@Autowired
protected S baseService;
@ApiOperation("增")
@PostMapping("/insert")
public ResponseUtils insert(@RequestBody E entity) {
baseService.save(entity);
return ResponseUtils.success("添加成功");
}
@ApiOperation("删")
@PostMapping("/deleteById")
public ResponseUtils delete(@RequestBody List<Integer> ids) {
baseService.removeByIds(ids);
return ResponseUtils.success("添加成功");
}
@ApiOperation("改")
@PostMapping("/updateById")
public ResponseUtils updateById(@RequestBody E entity) {
baseService.updateById(entity);
return ResponseUtils.success("添加成功");
}
@ApiOperation("查")
@GetMapping("/getById")
public ResponseUtils getById(@RequestParam Integer id) {
return ResponseUtils.success(baseService.getById(id));
}
@ApiOperation("存")
@PostMapping("/save")
public ResponseUtils save(@RequestBody E entity) {
baseService.saveOrUpdate(entity);
return ResponseUtils.success("添加成功");
}
@ApiOperation("list查")
@PostMapping("/list")
public ResponseUtils list(@RequestBody E entity) {
QueryWrapper<E> queryWrapper = ApprenticeUtil.getQueryWrapper(entity);
List<E> list = baseService.list(queryWrapper);
return ResponseUtils.success(list);
}
@ApiOperation("page查")
@PostMapping("/page")
public ResponseUtils page(@RequestBody PageParamDto<E> pageParamDto) {
//限制条件
if (pageParamDto.getPage() < 1) {
pageParamDto.setPage(1);
}
if (pageParamDto.getSize() > 100) {
pageParamDto.setSize(100);
}
Page<E> page = new Page<>(pageParamDto.getPage(), pageParamDto.getSize());
QueryWrapper<E> queryWrapper = new QueryWrapper<>();
//升序
String asc = pageParamDto.getAsc();
if (!StrUtil.isEmpty(asc) && !"null".equals(asc)) {
String[] split = asc.split(",");
queryWrapper.orderByAsc(split);
}
//降序
String desc = pageParamDto.getDesc();
if (!StrUtil.isEmpty(desc) && !"null".equals(desc)) {
String[] split = desc.split(",");
queryWrapper.orderByDesc(split);
}
Page<E> ePage = baseService.page(page, queryWrapper);
return ResponseUtils.success(ePage);
}
@ApiOperation("获取数量")
@PostMapping("/count")
public ResponseUtils count(@RequestBody E entity) {
QueryWrapper<E> queryWrapper = ApprenticeUtil.getQueryWrapper(entity);
long count = baseService.count(queryWrapper);
return ResponseUtils.success(count);
}
}
第四步，由于mybatisplus默认是不支持分页的，我们需要配置一下使他支持
import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class MybatisPlusConfig {
/** 设置分页插件
* @Param: []
* @return: com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor
* @Author: MaSiyi
* @Date: 2021/11/26
*/
@Bean
public MybatisPlusInterceptor mybatisPlusInterceptor() {
MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
return interceptor;
}
}
第五步，我们在自己的controller类中继承BaseController类
import com.wangfugui.apprentice.dao.domain.Dynamic;
import com.wangfugui.apprentice.service.IDynamicService;
import io.swagger.annotations.Api;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* <p>
* 动态表 前端控制器
* </p>
*
* @author MrFugui
* @since 2021-11-23
*/
@RestController
@RequestMapping("/apprentice/dynamic")
@Api("动态管理")
public class DynamicController extends BaseController<IDynamicService, Dynamic>{
}
import com.wangfugui.apprentice.dao.domain.Blog;
import com.wangfugui.apprentice.service.IBlogService;
import io.swagger.annotations.Api;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* <p>
* 博客表 前端控制器
* </p>
*
* @author MrFugui
* @since 2021-11-25
*/
@RestController
@RequestMapping("/apprentice/blog")
@Api(tags = "博客管理")
public class BlogController extends BaseController<IBlogService, Blog>{
}
这样就能使用啦！
仓库地址：
MybatisPlusPro
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最后
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