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河南国控建设集团招标网站,如何找外链资源,阿里云网站空间,网站开发的目的意义文章目录前言准备工具创建项目前言为什么使用SpringBoot?它有什么好处？ SpringBoot可以快速构建出独立的Spring应用，简化了配置文件。内嵌Tomcat服务器，无须手动部署war文件。准备工具 idea2022navicat16postmanjdk1.8 创建项目 File-&…

文章目录

- - - 前言
    - 准备工具
    - 创建项目

前言

为什么使用SpringBoot?它有什么好处？

SpringBoot可以快速构建出独立的Spring应用，简化了配置文件。
内嵌Tomcat服务器，无须手动部署war文件。

准备工具

idea2022
navicat16
postman
jdk1.8

创建项目

File->New->Project->Spring Initializr

输入项目名，组名，选择Java8版本（SpringBoot3.0版本需要jdk17，3.0之前的版本用jdk8，SANPSHOP是发行版，会优先用本地的maven依赖。）
$C:\Users\lucky\AppData\Roaming\Typora\typora-user-images\image-20230223094101238.png)$
点击Next,勾选4个依赖。

解释：

Lombok依赖可以根据成员变量生成get和set方法；可以根据成员变量生成类的构造函数；重写toString()和hashCode方法等。
Spring Web依赖可以自动帮我们引入web模块开发需要的相关jar包。
mybatis framework 就是把mybatis框架的依赖引进来可以对数据库做持久化操作 musql。
mysql就是数据库连接驱动 java操作数据库必须有这个依赖。

$(C:\Users\lucky\AppData\Roaming\Typora\typora-user-images\image-20230227091017760.png)$
连接数据库。

$(C:\Users\lucky\AppData\Roaming\Typora\typora-user-images\image-20230227093152864.png)$
输入用户名，密码以及所要连接的数据库，并进行测试连接的操作。

测试连接成功后点击应用即可。这边可以用生成器生成对应的实体等类，根据个人选择，我选用的生成器是mybaitscodehelper。

生成器配置如下：

生成的entity,mapper,service,xml等文件层级关系如下：

代码如下：

entity:

package com.xct.springboot.mybatisHelper.entitys;import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import io.swagger.v3.oas.annotations.media.Schema;
import java.io.Serializable;
import java.math.BigDecimal;
import java.util.Date;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;/*** @author xct* @date 2023年02月28日 09:12*/
@Schema
@Data
@AllArgsConstructor
@NoArgsConstructor
@TableName(value = "novel")
public class NovelHelper implements Serializable {@TableId(value = "id", type = IdType.INPUT)@Schema(description="")private Integer id;/*** 书名*/@TableField(value = "novel_name")@Schema(description="书名")private String novelName;/*** 作者*/@TableField(value = "author")@Schema(description="作者")private String author;/*** 类型*/@TableField(value = "`type`")@Schema(description="类型")private String type;/*** 价格*/@TableField(value = "price")@Schema(description="价格")private BigDecimal price;/*** 出版社*/@TableField(value = "publish")@Schema(description="出版社")private String publish;/*** 发行时间*/@TableField(value = "create_time")@Schema(description="发行时间")private Date createTime;/*** 逻辑删除状态*/@TableField(value = "logic_state")@Schema(description="逻辑删除状态")private Boolean logicState;private static final long serialVersionUID = 1L;public static final String COL_ID = "id";public static final String COL_NOVEL_NAME = "novel_name";public static final String COL_AUTHOR = "author";public static final String COL_TYPE = "type";public static final String COL_PRICE = "price";public static final String COL_PUBLISH = "publish";public static final String COL_CREATE_TIME = "create_time";public static final String COL_LOGIC_STATE = "logic_state";
}

mapper:

package com.xct.springboot.mybatisHelper.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.xct.springboot.mybatisHelper.entitys.NovelHelper;
import org.apache.ibatis.annotations.Mapper;/*** @author xct* @date 2023年02月28日 09:12*/
@Mapper
public interface NovelHelperMapper extends BaseMapper<NovelHelper> {
}

service:

package com.xct.springboot.mybatisHelper.service;import org.springframework.stereotype.Service;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.xct.springboot.mybatisHelper.entitys.NovelHelper;
import com.xct.springboot.mybatisHelper.mapper.NovelHelperMapper;
/*** @author xct* @date 2023年02月28日 09:12*/
@Service
public class NovelService extends ServiceImpl<NovelHelperMapper, NovelHelper> {}

xml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.xct.springboot.mybatisHelper.mapper.NovelHelperMapper"><resultMap id="BaseResultMap" type="com.xct.springboot.mybatisHelper.entitys.NovelHelper"><!--@mbg.generated--><!--@Table novel--><id column="id" jdbcType="INTEGER" property="id" /><result column="novel_name" jdbcType="VARCHAR" property="novelName" /><result column="author" jdbcType="VARCHAR" property="author" /><result column="type" jdbcType="VARCHAR" property="type" /><result column="price" jdbcType="DECIMAL" property="price" /><result column="publish" jdbcType="VARCHAR" property="publish" /><result column="create_time" jdbcType="TIMESTAMP" property="createTime" /><result column="logic_state" jdbcType="BOOLEAN" property="logicState" /></resultMap><sql id="Base_Column_List"><!--@mbg.generated-->id, novel_name, author, `type`, price, publish, create_time, logic_state</sql>
</mapper>

创建完成后，在yml文件中编写相关配置。

server:port: 8082
spring:datasource:type: com.zaxxer.hikari.HikariDataSourcedriver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/novel2?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai&nullCatalogMeansCurrent=trueusername: rootpassword: okmybatis-plus:mapper-locations: classpath:/mapper/**/*Mapper.xml,classpath:/mybatis/**/*.xml

这里需要注意的是：yml文件中用的是mybatisPlus映射，所以在pom文件中要引入mybatisPlus依赖。

将生成的类所需要的依赖加入到pom文件中。

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.7.9</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.xct</groupId><artifactId>springboot</artifactId><version>0.0.1-SNAPSHOT</version><name>springboot</name><description>springboot</description><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.3.0</version></dependency><dependency><groupId>com.mysql</groupId><artifactId>mysql-connector-j</artifactId><scope>runtime</scope></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-core</artifactId><version>3.5.2</version></dependency><!--mybatis-plus--><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.3.1</version></dependency><dependency><groupId>io.swagger.core.v3</groupId><artifactId>swagger-annotations</artifactId><version>2.2.0</version></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-extension</artifactId><version>3.5.2</version></dependency><!--hutool--><dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.8.12</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><configuration><excludes><exclude><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></exclude></excludes></configuration></plugin></plugins></build></project>

编写controller层：

package com.xct.springboot.controller;import com.xct.springboot.mybatisHelper.entitys.NovelHelper;
import com.xct.springboot.mybatisHelper.service.NovelService;
import lombok.AllArgsConstructor;
import org.springframework.web.bind.annotation.*;import java.util.Date;
import java.util.List;/*** @author xct* @date 2023年02月28日 09:13*/
@RestController
@AllArgsConstructor
@RequestMapping("novel")
public class NovelController {private final NovelService novelService;/*** @author xct* @date 2023/2/28 9:14* @name list* @description 增加*/@GetMapping("list")public List<NovelHelper> list(){System.out.println(novelService.list());return novelService.list();}/*** @author xct* @date 2023/2/28 13:24* @name add* @description 增加*/@PostMapping("add")public boolean add(NovelHelper helper){helper.setCreateTime(new Date());return novelService.save(helper);}/*** @author xct* @date 2023/2/28 13:24* @name update* @description 修改*/@PutMapping("update")public boolean update(NovelHelper helper){return novelService.updateById(helper);}/*** @author xct* @date 2023/3/1 14:24* @name delete* @description 删除*/@DeleteMapping("delete")public boolean delete(Long id){return novelService.removeById(id);}
}