项目开发流程梳理总结
【资料图】
1.环境准备1.准备数据库表(user,order);2.创建springboot 工程,引入对应的起步依赖(web,mybatis,mybatisx,mysql驱动,lombok);3.配置文件application.properties中引入mybatis的配置信息,准备对应的实体类;4.准备对应的mapper,service(接口,实现类),controller基础构建;
5.前后端统一交互响应结果Result
@Data@NoArgsConstructor@AllArgsConstructorpublic class Result{
private Integer code; //响应码:1代表成功;0代码失败;private String msg; // 响应描述信息private Object data; // 返回的数据
public static Result success(){return new Rresult(1,"success",null);}
public static Result success(Object data){return new Rresult(1,"success",data);}
public static Result error(String msg){return new Rresult(0,msg,null);}
}
6.日志小技巧@Slf4j
log.info("查询全部部门数据");
7--1.controller.java---------------@GetMapping@DeleteMapping@PostMapping@UpdateMapping
package com.itheima.controller;
import com.itheima.pojo.Dept;import com.itheima.pojo.Result;import com.itheima.service.DeptService;import lombok.extern.slf4j.Slf4j;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.*;
import java.util.List;
/**
部门管理Controller*/@Slf4j@RequestMapping("/depts")@RestControllerpublic class DeptController {
//private static Logger log = LoggerFactory.getLogger(DeptController.class);@Autowiredprivate DeptService deptService;
/**
- 查询部门数据
- @return*///@RequestMapping(value = "/depts",method = RequestMethod.GET) //指定请求方式为GET@GetMappingpublic Result list(){log.info("查询全部部门数据");//调用service查询部门数据List
deptList = deptService.list();return Result.success(deptList);}
/**
- 删除部门
- @return*/@DeleteMapping("/{id}")public Result delete(@PathVariable Integer id){log.info("根据id删除部门:{}",id);//调用service删除部门deptService.delete(id);return Result.success();}
/**
- 新增部门
- @return*/@PostMappingpublic Result add(@RequestBody Dept dept){log.info("新增部门: {}" , dept);//调用service新增部门deptService.add(dept);return Result.success();}}
7-2--------DeptServiceImpl.javapackage com.itheima.service.impl;
import com.itheima.mapper.DeptMapper;import com.itheima.pojo.Dept;import com.itheima.service.DeptService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;
import java.time.LocalDateTime;import java.util.List;
@Servicepublic class DeptServiceImpl implements DeptService {
@Autowiredprivate DeptMapper deptMapper;@Overridepublic List list() { return deptMapper.list();}@Overridepublic void delete(Integer id) { deptMapper.deleteById(id);}@Overridepublic void add(Dept dept) { dept.setCreateTime(LocalDateTime.now()); dept.setUpdateTime(LocalDateTime.now()); deptMapper.insert(dept);}
}
7-3------------------interface DeptServicepackage com.itheima.service;
import com.itheima.pojo.Dept;
import java.util.List;
/**
部门管理/public interface DeptService {/*
- 查询全部部门数据
- @return*/List
list();
/**
- 删除部门
- @param id*/void delete(Integer id);
/**
- 新增部门
- @param dept*/void add(Dept dept);}
7-4----------interface DeptMapperpackage com.itheima.mapper;
import com.itheima.pojo.Dept;import org.apache.ibatis.annotations.Delete;import org.apache.ibatis.annotations.Insert;import org.apache.ibatis.annotations.Mapper;import org.apache.ibatis.annotations.Select;
import java.util.List;
/**
部门管理/@Mapperpublic interface DeptMapper {/*
- 查询全部部门
- @return*/@Select("select * from dept")List
list();
/**
- 根据ID删除部门
- @param id*/@Delete("delete from dept where id = #{id}")void deleteById(Integer id);
/**
- 新增部门
- @param dept*/@Insert("insert into dept(name, create_time, update_time) values(#{name},#{createTime},#{updateTime})")void insert(Dept dept);}
7-5-------------------interface EmpMapper ========reources.com.alex.mapper.EmpMapper.xml---------------------package com.itheima.mapper;
import com.itheima.pojo.Emp;import org.apache.ibatis.annotations.Mapper;import org.apache.ibatis.annotations.Select;
import java.time.LocalDate;import java.util.List;
/**
员工管理*/@Mapperpublic interface EmpMapper {
/**
- 查询总记录数
- @return///@Select("select count() from emp")//public Long count();
/**
- 分页查询,获取列表数据
- @param start
- @param pageSize
- @return*///@Select("select * from emp limit #{start},#{pageSize}")//public List
page(Integer start, Integer pageSize);
/**
- 员工信息查询
- @return*///@Select("select * from emp")public List
list(String name, Short gender,LocalDate begin,LocalDate end);
/**
- 批量删除
- @param ids*/void delete(List
ids);}
7-6.--------EmpMapper.xml 映射文件--------------------
8.PageHelper分页插件
PageHelper.startPage(page,pagesize)引入依赖:
@Overridepublic PageBean page(Integer page, Integer pageSize,String name, Short gender,LocalDate begin,LocalDate end) {//1. 设置分页参数PageHelper.startPage(page,pageSize);
//2. 执行查询 List empList = empMapper.list(name, gender, begin, end); Page p = (Page) empList; //3. 封装PageBean对象 PageBean pageBean = new PageBean(p.getTotal(), p.getResult()); return pageBean;}
10.文件上传----------------------------------------------前端3要素:form post; enctype=multipart/form-data,input type=file
10.1上传到服务器本地:
MultipartFile imageString originalFilename = image.getOriginalFilename(); //获取文件的文件名image.transferTo(new File("E:\images\"+newFileName));getSize();//获取文件的大小,单位字节getBytes();//获取文件内容的字节数组InputStream getInputStream();//获取接收到的文件内容的输入流
10.2 上传到云服务器:OSS 云对象存储服务@PostMapping("/upload")public Result upload(MultipartFile image) throws IOException {log.info("文件上传, 文件名: {}", image.getOriginalFilename());
//调用阿里云OSS工具类进行文件上传 String url = aliOSSUtils.upload(image); log.info("文件上传完成,文件访问的url: {}", url); return Result.success(url);}
application.yml 设置上传文件的大小限制:servlet:multipart:max-file-size: 10MBmax-request-size: 100MB
11.springboot 配置文件:application.properties
@Value("endpoint") 注解private String endpoint;
12.springboot 配置文件:application.xml 推荐使用;
大小写敏感,缩进只能使用空格,值前需空格;
表示注释;
数据格式:对象/map集合;数组/list集合/set集合: -java -c#
- springboot 配置文件:application.xml 简化:ConfigurationProperties(prefix = "aliyun.oss") //批量注解多个值
@Value("endpoint") 注解1个值
关键词: