springboot项目建立教程（IntelliJIDEA，springboot 2.0 +mybatis）【JAVA教程】,springboot

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环境：

JDK8+windows10

步骤 New Module —>Spring Initializr—>next

3。web勾选web，sql内里能够不勾，后续增添，别的，勾选了MyBatis会报错Property 'sqlSessionFactory' or 'sqlSessionTemplate' are required 如许的毛病。这里我勾选了是为了待会处理这个毛病

选完直接下一步到最后就好了

自动生成的pom文件以下

<?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 http://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>2.0.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <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>2.0.0</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

## 目次构造

由于没有设置数据库和任何文件，application是空的，默许端口是8080

我们须要在在启动累疏忽数据库设置

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})

然后用postman接见一下申明项目是一般的

4.设置数据库 application.yml 文件

server:
  port: 8080
  tomcat:
    uri-encoding: UTF-8
  servlet:
    context-path: /
spring:
  dataSource:
    url: jdbc:mysql://localhost:3306/db-test?useUnicode=true&characterEncoding=utf8&tinyInt1isBit=false
    username: root
    password: 123456
    driverClassName: com.mysql.jdbc.Driver
mybatis:
  mapper-locations: classpath:com/example/demo/mapper/*Mapper.xml #注重：肯定要对应mapper映照xml文件的地点途径
  type-aliases-package: com.example.demo.model # 注重：对应实体类的途径
  configuration:
    call-setters-on-nulls: true # 处理运用map范例吸收查询效果的时刻为null的字段会没有的状况

这时刻 com.mysql.jdbc.Driver 标红 申明mysql架包找不到

把<scope>runtime</scope> 去掉，他的意义是运行时不须要，实际上是须要的

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>

改成版本默许就行

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

然后driverClassName 恢复一般

导入 service dao xml (这里没有运用实体类返回，运用的是map返回，所以表我们能够随便自建)

UserController

@Controller
@RequestMapping("/usersDemo")
public class UserController {
    private static Logger log = LoggerFactory.getLogger(UserController.class);
    @Resource
    UserService userService;

    @ResponseBody
    @RequestMapping(value = "/test", produces = "application/json;charset=UTF-8", method = {RequestMethod.POST, RequestMethod.GET})
    public List<Map<String, Object>> test(){
        log.info("进入了test要领！");
        List<Map<String,Object>> list=userService.userQueryAll();
        return list;
    }
}

UserService

public interface UserService {
    List<Map<String, Object>> userQueryAll();
}

UserserviceImpl

@Service
public class UserserviceImpl  implements UserService {
    @Resource
    UserMapper userDao;
    @Override
    public List<Map<String, Object>> userQueryAll() {
        return userDao.userQueryAll();
    }
}

UserMapper

@Mapper
public interface UserMapper {
    List<Map<String, Object>> userQueryAll();
}

UserMapper.xml

<?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.example.demo.dao.UserMapper">
    <select id="userQueryAll" parameterType="Map" resultType="Map">
        SELECT * FROM `users`
    </select>
</mapper>

DemoApplication

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
@MapperScan("com.example.demo.dao")
@ComponentScan(basePackages = {"com.example.demo.*"})
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

}

好了，

接下来就是启动了

5启动

注重：依靠注入后假如没有去掉 exclude = {DataSourceAutoConfiguration.class}

启动会报以下毛病：

Caused by: java.lang.IllegalArgumentException: Property 'sqlSessionFactory' or 'sqlSessionTemplate' are required

毛病缘由1：

很多人说 建立项目的时刻勾选了mybatis致使
  实际上是这个架包的缘由
假如不要的话也不能运用mybatis了 
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.0.0</version>
</dependency>

毛病缘由2 ，

dataSource.type 运用默许的连接池致使的

处理方案1 ：去掉 exclude = {DataSourceAutoConfiguration.class} ，就可以一般启动

处理方案2 :运用其他连接池，比方阿里 druid 连接池

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid-spring-boot-starter</artifactId>
    <version>1.1.13</version>
</dependency>

然后修正application.yml 内里的 spring.dataSource.type=com.alibaba.druid.pool.DruidDataSource

就可以够不删除 exclude = {DataSourceAutoConfiguration.class}了，实际上意义不大，属于初级毛病

6 继承启动，

日记是没错了，然后接见数据库的时刻能够会涌现

如许的毛病

org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.example.demo.dao.UserMapper.userQueryAll

毛病能够缘由 1. mapper.xml select 的 id写错了

处理方案：搜检代码

毛病能够缘由 2. 顺序没有编译xml文件

处理方案：pom.xml 文件 build内里增添代码

<resources>
<resource>
    <directory>src/main/java</directory>
    <includes>
        <include>**/*.xml</include>
    </includes>
    <filtering>false</filtering>
</resource>
</resources>

再次启动：

胜利

终究 pom.xml文件以下

<?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 http://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>2.0.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <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>2.0.0</version>
        </dependency>
        <!-- alibaba的druid数据库连接池监控依靠 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.13</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
        <resources>
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.xml</include>
            </includes>
            <filtering>false</filtering>
        </resource>
        </resources>
    </build>

</project>

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springboot项目建立教程（IntelliJIDEA，springboot 2.0 +mybatis）【JAVA教程】,springboot

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