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网络编程基础,深圳关键词推广整站优化,深圳专门做兼职的网站,如何做网站赚钱6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);}
}