在Spring boot 框架中使用JDBC遇到一点问题

[Aitar_XD]

jdk1.8.0_161
Spring boot 2.0


出现'org.springframework.jdbc.core.JdbcTemplate' that could not be found.的错误，程序无法运行

pom.xml

<?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>

	<groupId>com.example</groupId>
	<artifactId>HelloWorld</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>HelloWorld</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.0.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<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.springframework</groupId>
    <artifactId>spring-tx</artifactId>
    <version>4.0.2.RELEASE</version>
</dependency>
		

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.21</version>
			<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>

之前出现编译错误，在网上查找原因说是没有spring-tx 4.0.2.RELEASE 这个包，于是添加依赖，错误消失，但是又报了错误

package com.example.demo.App;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;


@ComponentScan(basePackages = {"com.example.demo.Controller","com.example.demo.service"})
@SpringBootApplication
public class HelloWorldApplication {

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

package com.example.demo.Controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.example.demo.service.UserService;

@RestController
public class UserController {
	@Autowired 
    private UserService userService;
	
	@RequestMapping("/creatUser")
	public String createUser(String name, Integer age) {
		userService.createUser(name, age);
		return "success";
	}
}

package com.example.demo.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Service;

@Service
public class UserService {
	@Autowired
	private JdbcTemplate jdbcTemplate;
	
	public void createUser(String name, Integer age) {
		jdbcTemplate.update("insert into abc values(1,?,?);", name, age);
		
	}

}
        

[jdyyi]

jdbcTemplate在哪实例化的？

[WonHyo]

配置文件添加个数据源，比如阿里巴巴的数据源，然后添加maven依赖

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/wxapp
spring.datasource.username=root
spring.datasource.password=sql12345
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource