springBoot搭建一

如何用idea建springBoot

一 建立工程

1.啓動idea

2.選擇

3 填寫名稱（不多贅述）

4 選擇自己需要的（也可以後面再通過maven添加）

5.看下建好的目錄結構

6 導座標
此處作爲自己備份，少哪個添哪個

<?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>2.3.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.neusoft.player</groupId>
    <artifactId>hello</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>hello</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-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- 熱部署 -->
        <dependency>

            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <version>2.0.4.RELEASE</version>

            <!-- 啓用 -->
            <optional>true</optional>
        </dependency>
        <!-- 添加MySQL依賴 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!-- 添加JDBC依賴 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
        </dependency>

    </dependencies>

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

</project>

6.修改yml

spring:
  datasource:
    url: jdbc:mysql://數據庫地址/數據庫?useUnicode=true&characterEncoding=utf8
    driverClassName: com.mysql.cj.jdbc.Driver
    username: 用戶名
    password: 密碼

二 測試

package com.neusoft.player.hello.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @RequestMapping("/hello")
    public String Hello(String print){
        return "this is a cool!"+ print;
    }
}

瀏覽器測試：

http://localhost:8080/hello?print=1024

三 連接數據庫

package com.neusoft.player.hello.datasource;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.jdbc.core.JdbcTemplate;

import javax.sql.DataSource;
import java.sql.Connection;

@SpringBootApplication
@Slf4j
public class SpringDataSource implements CommandLineRunner {
    @Autowired
    private DataSource dataSource;

    @Autowired
    private JdbcTemplate jdbcTemplate;
    public static void main(String[] args) {
        SpringApplication.run(SpringDataSource.class,args);
    }



   //測試連接
    private void showConn() throws Exception{
        log.info(dataSource.getConnection().toString());
        Connection connection =dataSource.getConnection();
        log.info(connection.toString());
        connection.close();
    }

    private void count() throws Exception{
        String sql="select count(*) from soup";
        String str= jdbcTemplate.queryForObject(sql,String.class);

        System.out.println(str);
    }


    @Override
    public void run(String... args) throws Exception {
        showConn();
        count();
    }
}

可以看到，控制檯有結果打印。ps：日誌打印有問題，還需再接着調試。