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【java】【项目实战】[外卖四]分类管理业务开发

news 2025/7/20 17:32:57

前言：公共字段自动填充实现，删除业务逻辑实现

一、公共字段自动填充

1.1 问题分析

1.2 代码实现

 1.2.1 修改实体类Employee

package com.runa.reggie.entity;import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.annotation.TableField;
import lombok.Data;
import java.io.Serializable;
import java.time.LocalDateTime;@Data
public class Employee implements Serializable {private static final long serialVersionUID = 1L;private Long id;private String username;private String name;private String password;private String phone;private String sex;private String idNumber;private Integer status;@TableField(fill = FieldFill.INSERT)  //插入时更新字段private LocalDateTime createTime;@TableField(fill = FieldFill.INSERT_UPDATE)  //插入和更新时更新字段private LocalDateTime updateTime;@TableField(fill = FieldFill.INSERT)private Long createUser;@TableField(fill = FieldFill.INSERT_UPDATE)private Long updateUser;}

 1.2.2 MyMetaObjectHandler

package com.runa.reggie.common;import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.stereotype.Component;import java.time.LocalDateTime;@Slf4j
@Component
public class MyMetaObjectHandler implements MetaObjectHandler {/*** 插入操作，自动填充* @param metaObject*/@Overridepublic void insertFill(MetaObject metaObject) {log.info("公共字段自动填充[insert]...");log.info(metaObject.toString());metaObject.setValue("createTime", LocalDateTime.now());metaObject.setValue("updateTime", LocalDateTime.now());metaObject.setValue("createUser", new Long(1) );metaObject.setValue("updateUser", new Long(1));}/*** 更新操作，自动填充* @param metaObject*/@Overridepublic void updateFill(MetaObject metaObject) {log.info("公共字段自动填充[update]...");log.info(metaObject.toString());metaObject.setValue("updateTime", LocalDateTime.now());metaObject.setValue("updateUser", new Long(1));}
}

 1.2.3 EmployeeController将新增、修改方法当中的公共字段赋值注释掉 

package com.runa.reggie.controller;import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.runa.reggie.common.R;
import com.runa.reggie.entity.Employee;
import com.runa.reggie.service.impl.EmployeeServcie;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.DigestUtils;
import org.apache.commons.lang.StringUtils;
import org.springframework.web.bind.annotation.*;import javax.servlet.http.HttpServletRequest;
import java.time.LocalDateTime;@Slf4j
@RestController
@RequestMapping("/employee")
public class EmployeeController {@Autowiredprivate EmployeeServcie employeeServcie;/*** 员工登录* @param request* @param employee* @return*///HttpServletRequest request  是为了将登录对象塞入session@PostMapping("/login")public R<Employee> login(HttpServletRequest request, @RequestBody Employee employee){//1、将页面提交的密码password进行md5加密处理String password = employee.getPassword();password = DigestUtils.md5DigestAsHex(password.getBytes());//2、根据页面提交的用户名username查询数据库LambdaQueryWrapper<Employee> queryWrapper = new LambdaQueryWrapper<>();queryWrapper.eq(Employee::getUsername,employee.getUsername());Employee emp = employeeServcie.getOne(queryWrapper);//3、如果没有查询到则返回登录失败结果if(emp == null){return R.error("登录失败");}//4、密码比对，如果不一致则返回登录失败结果if(!emp.getPassword().equals(password)){return R.error("登录失败");}//5、查看员工状态，如果为已禁用状态，则返回员工已禁用结果if(emp.getStatus() == 0){return R.error("账号已禁用");}//6、登录成功，将员工id存入Session并返回登录成功结果request.getSession().setAttribute("employee",emp.getId());return R.success(emp);}@PostMapping("/logout")public R<String> logout(HttpServletRequest request){// 清理Session 中保存的当前员工的idrequest.getSession().removeAttribute("emplyee");return R.success("退出成功！");}@PostMappingpublic R<String> save(HttpServletRequest request, @RequestBody Employee employee){log.info("新增员工，员工信息为:{}",employee.toString());// 设置初始密码123456，需要进行md5加密处理employee.setPassword(DigestUtils.md5DigestAsHex("123456".getBytes()));//        employee.setCreateTime(LocalDateTime.now());
//        employee.setUpdateTime(LocalDateTime.now());
//        //获得当前用户的id
//        Long empId = (Long) request.getSession().getAttribute("employee");
//        employee.setCreateUser(empId);
//        employee.setUpdateUser(empId);employeeServcie.save(employee);return R.success("新增员工成功");}/*** 员工信息分页查询* @param page* @param pageSize* @param name* @return*/@GetMapping("/page")public R<Page> page(int page, int pageSize,String name){log.info("page= {}, pageSize= {}, name = {}",page, pageSize, name);// 构造分页构造器Page pageInfo = new Page(page, pageSize);//构造条件构造器LambdaQueryWrapper<Employee> queryWrapper = new LambdaQueryWrapper();// 添加过滤条件//当传入的name不为空的时候才会添加条件queryWrapper.like(StringUtils.isNotEmpty(name),Employee::getName,name);// 添加排序条件queryWrapper.orderByDesc(Employee::getUpdateTime);//执行查询employeeServcie.page(pageInfo, queryWrapper);return R.success(pageInfo);}/*** 根据ID修改员工信息* @param employee* @return*/@PutMappingpublic R<String> update(HttpServletRequest request, @RequestBody Employee employee){log.info(employee.toString());//        Long empId = (Long) request.getSession().getAttribute("employee");
//        employee.setUpdateUser(empId);
//        employee.setUpdateTime(LocalDateTime.now());employeeServcie.updateById(employee);return R.success("员工信息修改成功");}@GetMapping("/{id}")public R<Employee> GetById(@PathVariable Long id){log.info("根据id查询员工：{}",id);Employee employee = employeeServcie.getById(id);if(employee != null){return R.success(employee);}return R.error("没有查询到对应员工信息");}}

1.3 功能测试

1.4 功能完善

 

 

 1.4.1 BaseContext 

package com.runa.reggie.common;public class BaseContext {private static ThreadLocal<Long> threadLocal = new ThreadLocal<>();public static void setCurrentId(Long id){threadLocal.set(id);}public static Long getCurrent(){return threadLocal.get();}
}

1.4.2 LoginCheckFilter优化将用户id塞进线程

package com.runa.reggie.filter;import com.alibaba.fastjson.JSON;
import com.runa.reggie.common.BaseContext;
import com.runa.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {// 路径匹配器public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {HttpServletRequest request = (HttpServletRequest) servletRequest;HttpServletResponse response = (HttpServletResponse) servletResponse;// 1  获取本次请求的URI//        request.getRequestURL()返回的是全路径。//        request.getRequestURI()返回的是除去协议，域名（IP+端口号）之后的路由部分。String requestURI = request.getRequestURI();log.info("拦截到请求：【{}】",requestURI);// 定义一些不需要处理的路径String[] urls = new String[]{"/employee/login",    // 登录不需要"/employee/logout","/backend/**","/front/**"};// 2  判断本次请求是否需要处理boolean check = check(urls, requestURI);// 3 如果不需要处理,则直接放行if(check){log.info("本次请求【 {} 】 不需要处理",requestURI);filterChain.doFilter(request,response);return;}// 4 判断登录状态，如果已登录，则直接放行if(request.getSession().getAttribute("employee") != null){log.info("用户已登录，请求url为：【{}】, 用户id为:【 {} 】 ",requestURI,request.getSession().getAttribute("employee"));// 获取ID 塞进线程Long empId = (Long) request.getSession().getAttribute("employee");BaseContext.setCurrentId(empId);filterChain.doFilter(request,response);return;}log.info("用户未登录");// 5 如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));return;}/*** 路径匹配，检查本次请求是否需要放行* @param urls* @param requestURI* @return*/public boolean check(String[] urls, String requestURI){for (String url : urls) {boolean match = PATH_MATCHER.match(url, requestURI);if(match){return true;}}// 循环都匹配不上就返回falsereturn false;}
}

1.4.3 MyMetaObjectHandler 

package com.runa.reggie.common;import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.stereotype.Component;import java.time.LocalDateTime;@Slf4j
@Component
public class MyMetaObjectHandler implements MetaObjectHandler {/*** 插入操作，自动填充* @param metaObject*/@Overridepublic void insertFill(MetaObject metaObject) {log.info("公共字段自动填充[insert]...");log.info(metaObject.toString());metaObject.setValue("createTime", LocalDateTime.now());metaObject.setValue("updateTime", LocalDateTime.now());metaObject.setValue("createUser", BaseContext.getCurrent());metaObject.setValue("updateUser",  BaseContext.getCurrent());}/*** 更新操作，自动填充* @param metaObject*/@Overridepublic void updateFill(MetaObject metaObject) {log.info("公共字段自动填充[update]...");log.info(metaObject.toString());metaObject.setValue("updateTime", LocalDateTime.now());metaObject.setValue("updateUser",  BaseContext.getCurrent());}
}

二、新增分类

2.1 需求分析

2.2 数据模型

2.3 代码实现

 

 

 2.3.1 实体类Category

package com.runa.reggie.entity;import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import lombok.Data;
import lombok.Getter;
import lombok.Setter;
import java.io.Serializable;
import java.time.LocalDateTime;/*** 分类*/
@Data
public class Category implements Serializable {private static final long serialVersionUID = 1L;private Long id;//类型 1 菜品分类 2 套餐分类private Integer type;//分类名称private String name;//顺序private Integer sort;//创建时间@TableField(fill = FieldFill.INSERT)private LocalDateTime createTime;//更新时间@TableField(fill = FieldFill.INSERT_UPDATE)private LocalDateTime updateTime;//创建人@TableField(fill = FieldFill.INSERT)private Long createUser;//修改人@TableField(fill = FieldFill.INSERT_UPDATE)private Long updateUser;//是否删除private Integer isDeleted;}

2.3.2 CategoryMapper

package com.runa.reggie.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.runa.reggie.entity.Category;
import org.apache.ibatis.annotations.Mapper;@Mapper
public interface CategoryMapper  extends BaseMapper<Category> {
}

2.3.3 CategoryService

package com.runa.reggie.service;import com.baomidou.mybatisplus.extension.service.IService;
import com.runa.reggie.entity.Category;public interface CategoryService extends IService<Category> {
}

2.3.4 CategoryServiceImpl

package com.runa.reggie.service.impl;import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.runa.reggie.entity.Category;
import com.runa.reggie.mapper.CategoryMapper;
import com.runa.reggie.service.CategoryService;
import org.springframework.stereotype.Service;@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
}

2.3.5 CategoryController

package com.runa.reggie.controller;import com.runa.reggie.service.CategoryService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;/*** 分类管理*/
@Slf4j
@RestController
@RequestMapping("/category")
public class CategoryController {@Autowiredprivate CategoryService categoryService;
}

 

 2.3.6 CategoryController新增save方法

​
package com.runa.reggie.controller;import com.runa.reggie.common.R;
import com.runa.reggie.entity.Category;
import com.runa.reggie.service.CategoryService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;/*** 分类管理*/
@Slf4j
@RestController
@RequestMapping("/category")
public class CategoryController {@Autowiredprivate CategoryService categoryService;/*** 新增分类* @param category* @return*/@PostMappingpublic R<String> save(@RequestBody Category category){log.info("新增分类：{}", category);categoryService.save(category);return R.success("新增分类成功");}
}​

2.4 功能测试

 

三、分类信息分页查询

3.1 需求分析

 

3.2 代码实现

 3.2.1 CategoryController

package com.runa.reggie.controller;import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.runa.reggie.common.R;
import com.runa.reggie.entity.Category;
import com.runa.reggie.service.CategoryService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;/*** 分类管理*/
@Slf4j
@RestController
@RequestMapping("/category")
public class CategoryController {@Autowiredprivate CategoryService categoryService;/*** 新增分类* @param category* @return*/@PostMappingpublic R<String> save(@RequestBody Category category){log.info("新增分类：{}", category);categoryService.save(category);return R.success("新增分类成功");}/*** 分页查询* @param page* @param pageSize* @return*/@GetMapping("/page")public R<Page> page(int page, int pageSize){log.info("page= {}, pageSize= {}, name = {}",page, pageSize);//分页构造器Page pageInfo = new Page(page, pageSize);// 条件构造器LambdaQueryWrapper<Category> queryWrapper = new LambdaQueryWrapper<>();//添加排序条件，根据sort排序queryWrapper.orderByAsc(Category::getSort);//进行分页查询categoryService.page(pageInfo, queryWrapper);return R.success(pageInfo);}
}

3.2.1 Category注释是否删除字段

package com.runa.reggie.entity;import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import lombok.Data;
import lombok.Getter;
import lombok.Setter;
import java.io.Serializable;
import java.time.LocalDateTime;/*** 分类*/
@Data
public class Category implements Serializable {private static final long serialVersionUID = 1L;private Long id;//类型 1 菜品分类 2 套餐分类private Integer type;//分类名称private String name;//顺序private Integer sort;//创建时间@TableField(fill = FieldFill.INSERT)private LocalDateTime createTime;//更新时间@TableField(fill = FieldFill.INSERT_UPDATE)private LocalDateTime updateTime;//创建人@TableField(fill = FieldFill.INSERT)private Long createUser;//修改人@TableField(fill = FieldFill.INSERT_UPDATE)private Long updateUser;//是否删除
//    private Integer isDeleted;}

 

3.3 功能测试

 

四、删除分类

4.1 需求分析

 

4.2 代码实现

 4.2.1  CategoryController

注意传参是ids

package com.runa.reggie.controller;import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.runa.reggie.common.R;
import com.runa.reggie.entity.Category;
import com.runa.reggie.service.CategoryService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;/*** 分类管理*/
@Slf4j
@RestController
@RequestMapping("/category")
public class CategoryController {@Autowiredprivate CategoryService categoryService;/*** 新增分类* @param category* @return*/@PostMappingpublic R<String> save(@RequestBody Category category){log.info("新增分类：{}", category);categoryService.save(category);return R.success("新增分类成功");}/*** 分页查询* @param page* @param pageSize* @return*/@GetMapping("/page")public R<Page> page(int page, int pageSize){log.info("page= {}, pageSize= {}, name = {}",page, pageSize);//分页构造器Page pageInfo = new Page(page, pageSize);// 条件构造器LambdaQueryWrapper<Category> queryWrapper = new LambdaQueryWrapper<>();//添加排序条件，根据sort排序queryWrapper.orderByAsc(Category::getSort);//进行分页查询categoryService.page(pageInfo, queryWrapper);return R.success(pageInfo);}/*** 根据id删除分类* @param ids* @return*/@DeleteMappingpublic R<String> delete(Long ids){log.info("根据ID删除分类：{}",ids);categoryService.removeById(ids);return R.success("分类信息删除成功");}
}

4.3 功能测试

 

4.4 功能完善

 4.4.1 菜品实体类Dish 

package com.runa.reggie.entity;import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import lombok.Data;
import java.io.Serializable;
import java.math.BigDecimal;
import java.time.LocalDateTime;/**菜品*/
@Data
public class Dish implements Serializable {private static final long serialVersionUID = 1L;private Long id;//菜品名称private String name;//菜品分类idprivate Long categoryId;//菜品价格private BigDecimal price;//商品码private String code;//图片private String image;//描述信息private String description;//0 停售 1 起售private Integer status;//顺序private Integer sort;@TableField(fill = FieldFill.INSERT)private LocalDateTime createTime;@TableField(fill = FieldFill.INSERT_UPDATE)private LocalDateTime updateTime;@TableField(fill = FieldFill.INSERT)private Long createUser;@TableField(fill = FieldFill.INSERT_UPDATE)private Long updateUser;//是否删除private Integer isDeleted;}

4.4.2 套餐实体类Setmeal 

package com.runa.reggie.entity;import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import lombok.Data;
import java.io.Serializable;
import java.math.BigDecimal;
import java.time.LocalDateTime;/*** 套餐*/
@Data
public class Setmeal implements Serializable {private static final long serialVersionUID = 1L;private Long id;//分类idprivate Long categoryId;//套餐名称private String name;//套餐价格private BigDecimal price;//状态 0:停用 1:启用private Integer status;//编码private String code;//描述信息private String description;//图片private String image;@TableField(fill = FieldFill.INSERT)private LocalDateTime createTime;@TableField(fill = FieldFill.INSERT_UPDATE)private LocalDateTime updateTime;@TableField(fill = FieldFill.INSERT)private Long createUser;@TableField(fill = FieldFill.INSERT_UPDATE)private Long updateUser;//是否删除private Integer isDeleted;
}

 4.4.3 DishMapper 

package com.runa.reggie.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.runa.reggie.entity.Dish;
import org.apache.ibatis.annotations.Mapper;@Mapper
public interface DishMapper extends BaseMapper<Dish> {
}

4.4.4 SetmealMapper 

package com.runa.reggie.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.runa.reggie.entity.Setmeal;
import org.apache.ibatis.annotations.Mapper;@Mapper
public interface SetmealMapper extends BaseMapper<Setmeal> {
}

4.4.5 DishService 

package com.runa.reggie.service;import com.baomidou.mybatisplus.extension.service.IService;
import com.runa.reggie.entity.Dish;public interface DishService extends IService<Dish> {
}

 4.4.6 SetmealService 

package com.runa.reggie.service;import com.baomidou.mybatisplus.extension.service.IService;
import com.runa.reggie.entity.Setmeal;public interface SetmealService extends IService<Setmeal> {
}

4.4.7 DishServiceImpl 

package com.runa.reggie.service.impl;import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.runa.reggie.entity.Dish;
import com.runa.reggie.mapper.DishMapper;
import com.runa.reggie.service.DishService;
import org.springframework.stereotype.Service;@Service
public class DishServiceImpl extends ServiceImpl<DishMapper, Dish> implements DishService {
}

 4.4.8 SetmealServiceImpl 

package com.runa.reggie.service.impl;import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.runa.reggie.entity.Setmeal;
import com.runa.reggie.mapper.SetmealMapper;
import com.runa.reggie.service.SetmealService;
import org.springframework.stereotype.Service;@Service
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {
}

 4.4.9 修改CategoryService

package com.runa.reggie.service;import com.baomidou.mybatisplus.extension.service.IService;
import com.runa.reggie.entity.Category;public interface CategoryService extends IService<Category> {public void remove(Long ids);
}

4.4.10  自定义业务异常类CustomException 

 

package com.runa.reggie.common;/*** 自定义业务异常类*/
public class CustomException extends RuntimeException {public CustomException(String message){super(message);}
}

4.4.11 CategoryServiceImpl 

package com.runa.reggie.service.impl;import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.runa.reggie.common.CustomException;
import com.runa.reggie.entity.Category;
import com.runa.reggie.entity.Dish;
import com.runa.reggie.entity.Setmeal;
import com.runa.reggie.mapper.CategoryMapper;
import com.runa.reggie.service.CategoryService;
import com.runa.reggie.service.DishService;
import com.runa.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {@Autowiredprivate DishService dishService;@Autowiredprivate SetmealService setmealService;@Overridepublic void remove(Long ids) {LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();//添加查询条件，根据分类id查询dishLambdaQueryWrapper.eq(Dish::getCategoryId,ids);int count1 = dishService.count(dishLambdaQueryWrapper);// 查询分类是否关联了菜品，如果关联了，抛出一个业务异常if(count1 > 0){// 关联了 抛出异常throw new CustomException("当前分类下关联了菜品，不能删除");}LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();//添加查询条件，根据分类id查询setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId,ids);int count2 = setmealService.count(setmealLambdaQueryWrapper);// 查询分类是否关联了套餐，如果关联了，抛出一个业务异常if(count2 > 0){// 关联了 抛出异常throw new CustomException("当前分类下关联了套餐，不能删除");}//执行删除super.removeById(ids);}
}

 4.4.12 GlobaExceptionHandler 

package com.runa.reggie.common;import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;import java.sql.SQLIntegrityConstraintViolationException;/*** 全局异常处理*/
@ControllerAdvice(annotations = {RestController.class, Controller.class})   // 加了RestController Controller 注解的
@ResponseBody
@Slf4j
public class GlobaExceptionHandler {/*** 异常处理方法* @return*/@ExceptionHandler(SQLIntegrityConstraintViolationException.class)public R<String> exceptionHandler(SQLIntegrityConstraintViolationException ex){String msg = ex.getMessage();log.error(msg);if(msg.contains("Duplicate entry")){String[] split = msg.split(" "); //空分割String resultMsg = split[2] + " 已存在 ";return R.error(resultMsg);}return R.error("未知错误！");}/*** 异常处理方法(处理自定义的)* @return*/@ExceptionHandler(CustomException.class)public R<String> exceptionHandler(CustomException ex){String msg = ex.getMessage();log.error(msg);return R.error(msg);}}

4.4.13 CategoryController 

package com.runa.reggie.controller;import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.runa.reggie.common.R;
import com.runa.reggie.entity.Category;
import com.runa.reggie.service.CategoryService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;/*** 分类管理*/
@Slf4j
@RestController
@RequestMapping("/category")
public class CategoryController {@Autowiredprivate CategoryService categoryService;/*** 新增分类* @param category* @return*/@PostMappingpublic R<String> save(@RequestBody Category category){log.info("新增分类：{}", category);categoryService.save(category);return R.success("新增分类成功");}/*** 分页查询* @param page* @param pageSize* @return*/@GetMapping("/page")public R<Page> page(int page, int pageSize){log.info("page= {}, pageSize= {}, name = {}",page, pageSize);//分页构造器Page pageInfo = new Page(page, pageSize);// 条件构造器LambdaQueryWrapper<Category> queryWrapper = new LambdaQueryWrapper<>();//添加排序条件，根据sort排序queryWrapper.orderByAsc(Category::getSort);//进行分页查询categoryService.page(pageInfo, queryWrapper);return R.success(pageInfo);}/*** 根据id删除分类* @param ids* @return*/@DeleteMappingpublic R<String> delete(Long ids){log.info("根据ID删除分类：{}",ids);
//        categoryService.removeById(ids);categoryService.remove(ids);return R.success("分类信息删除成功");}
}

 

 

五、修改分类

5.1 需求分析

 

5.2 代码实现

5.2.1 CategoryController

package com.runa.reggie.controller;import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.runa.reggie.common.R;
import com.runa.reggie.entity.Category;
import com.runa.reggie.service.CategoryService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;/*** 分类管理*/
@Slf4j
@RestController
@RequestMapping("/category")
public class CategoryController {@Autowiredprivate CategoryService categoryService;/*** 新增分类* @param category* @return*/@PostMappingpublic R<String> save(@RequestBody Category category){log.info("新增分类：{}", category);categoryService.save(category);return R.success("新增分类成功");}/*** 分页查询* @param page* @param pageSize* @return*/@GetMapping("/page")public R<Page> page(int page, int pageSize){log.info("page= {}, pageSize= {}, name = {}",page, pageSize);//分页构造器Page pageInfo = new Page(page, pageSize);// 条件构造器LambdaQueryWrapper<Category> queryWrapper = new LambdaQueryWrapper<>();//添加排序条件，根据sort排序queryWrapper.orderByAsc(Category::getSort);//进行分页查询categoryService.page(pageInfo, queryWrapper);return R.success(pageInfo);}/*** 根据id删除分类* @param ids* @return*/@DeleteMappingpublic R<String> delete(Long ids){log.info("根据ID删除分类：{}",ids);
//        categoryService.removeById(ids);categoryService.remove(ids);return R.success("分类信息删除成功");}@PutMappingpublic R<String> update(@RequestBody Category category){log.info("根据id更新分类信息：{}",category);categoryService.updateById(category);return R.success("修改分类信息成功");}
}

5.3 功能测试

 

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