本篇文章给大家带来的内容是关于springboot项目创建教程(IntelliJIDEA,springboot 2.0 +mybatis),有一定的参考价值,有需要的朋友可以参考一下,希望对你有所帮助。
环境:
JDK8+windows10
步骤 New Module —>Spring Initializr—>next
1
2.
3。web勾选web,sql里面可以不勾,后续添加,另外,勾选了MyBatis会报错Property 'sqlSessionFactory' or 'sqlSessionTemplate' are required 这样的错误。这里我勾选了是为了待会解决这个错误
选完直接下一步到最后就行了
自动生成的pom文件如下
<?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>
## 目录结构
因为没有配置数据库和任何文件,application是空的 ,默认端口是8080
我们需要在 在启动累忽略数据库配置
@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
然后 用postman访问一下 说明项目是正常的
4.配置数据库 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 #注意:一定要对应mapper映射xml文件的所在路径 type-aliases-package: com.example.demo.model # 注意:对应实体类的路径 configuration: call-setters-on-nulls: true # 解决使用map类型接收查询结果的时候为null的字段会没有的情况
这时候 com.mysql.jdbc.Driver 标红 说明mysql架包找不到
把<scope>runtime</scope> 去掉, 他的意思是运行时不需要,实际上是需要的
<dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency>
改成 版本默认就行
<dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency>
然后driverClassName 恢复正常
导入 service dao xml (这里没有使用实体类返回,使用的是map返回,所以表我们可以随意自建) 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方法!"); 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
注意 :依赖注入后 如果没有去掉 exclude = {DataSourceAutoConfiguration.class}
启动会报如下错误:
Caused by: java.lang.IllegalArgumentException: Property 'sqlSessionFactory' or 'sqlSessionTemplate' are required
错误原因1:
很多人说 创建项目的时候勾选了mybatis导致 实际上是这个架包的原因 如果不要的话也不能使用mybatis了 <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.0.0</version> </dependency>
错误原因2 ,
dataSource.type 使用默认的连接池导致的
解决方案1 :去掉 exclude = {DataSourceAutoConfiguration.class} ,就能正常启动
解决方案2 :使用其他连接池 ,比如阿里 druid 连接池
<dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.13</version> </dependency>
然后修改application.yml 里面的 spring.dataSource.type=com.alibaba.druid.pool.DruidDataSource
就可以不删除 exclude = {DataSourceAutoConfiguration.class}了 ,实际上意义不大,属于低级错误
6 继续启动,
日志是没错了, 然后访问数据库的时候 可能会出现
这样的错误
org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.example.demo.dao.UserMapper.userQueryAll
错误可能原因 1. mapper.xml select 的 id写错了
解决方案:检查代码
错误可能原因 2. 程序没有编译xml文件
解决方案:pom.xml 文件 build里面 增加代码
<resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> </includes> <filtering>false</filtering> </resource> </resources>
再次启动 :
成功
最终 pom.xml文件如下
<?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赖 --> <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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