Springboot web 项目开发流程梳理总结
项目开发流程梳理总结
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
@AllArgsConstructor
public 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")
@RestController
public class DeptController {
//private static Logger log = LoggerFactory.getLogger(DeptController.class);
@Autowired
private DeptService deptService;
/**
* 查询部门数据
* @return
*/
//@RequestMapping(value = "/depts",method = RequestMethod.GET) //指定请求方式为GET
@GetMapping
public Result list(){
log.info("查询全部部门数据");
//调用service查询部门数据
List<Dept> 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
*/
@PostMapping
public 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.java
package 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;
@Service
public class DeptServiceImpl implements DeptService {
@Autowired
private DeptMapper deptMapper;
@Override
public List<Dept> list() {
return deptMapper.list();
}
@Override
public void delete(Integer id) {
deptMapper.deleteById(id);
}
@Override
public void add(Dept dept) {
dept.setCreateTime(LocalDateTime.now());
dept.setUpdateTime(LocalDateTime.now());
deptMapper.insert(dept);
}
}
7-3------------------interface DeptService
package 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<Dept> list();
/**
* 删除部门
* @param id
*/
void delete(Integer id);
/**
* 新增部门
* @param dept
*/
void add(Dept dept);
}
7-4----------interface DeptMapper
package 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
*/
@Mapper
public interface DeptMapper {
/**
* 查询全部部门
* @return
*/
@Select("select * from dept")
List<Dept> 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
*/
@Mapper
public 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<Emp> page(Integer start, Integer pageSize);
/**
* 员工信息查询
* @return
*/
//@Select("select * from emp")
public List<Emp> list(String name, Short gender,LocalDate begin,LocalDate end);
/**
* 批量删除
* @param ids
*/
void delete(List<Integer> ids);
}
7-6.--------EmpMapper.xml 映射文件--------------------
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.itheima.mapper.EmpMapper">
<!--批量删除员工 (1, 2, 3)-->
<delete id="delete">
delete
from emp
where id in
<foreach collection="ids" item="id" separator="," open="(" close=")">
#{id}
</foreach>
</delete>
<!--条件查询-->
<select id="list" resultType="com.itheima.pojo.Emp">
select *
from emp
<where>
<if test="name != null and name != ''">
name like concat('%',#{name},'%')
</if>
<if test="gender != null">
and gender = #{gender}
</if>
<if test="begin != null and end != null">
and entrydate between #{begin} and #{end}
</if>
</where>
order by update_time desc
</select>
</mapper>
8.PageHelper分页插件
PageHelper.startPage(page,pagesize)
引入依赖:
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.4.2</version>
</dependency>
@Override
public 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<Emp> empList = empMapper.list(name, gender, begin, end);
Page<Emp> p = (Page<Emp>) 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 image
String 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: 10MB
max-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#
13. 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