springBoot 快速配置

<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>org.byron4j</groupId>
    <artifactId>springBoot</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springBoot</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <!--引入Spring Boot的parent模块-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.1.RELEASE</version>
    </parent>


    <dependencies>
        <!--引入Spring Boot 的web依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!--引入Spring Boot 的单元测试依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.5.1</version>
            <!--指定JDK版本1.8-->
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
    </plugins>
    </build>


</project>

pom.xml文件配置

第二步，写一个启动类

package com.springboot.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * <pre>Spring Boot服务启动入口，使用了@SpringBootApplication注解，
 *  会自动扫描该类子路径下所有
 *   @Controller、@Service、@Repository、@Conponent 等注解类</   pre>
 */
@SpringBootApplication
public class BaseApplication {
    public static void main(String[] args) {
        SpringApplication.run(BaseApplication.class, args);
    }

}

第三步，写一个controller

需要注意加上Controller注解，方法体上面要加ResponseBody注解，否则会返回一个页面

package com.springboot.demo.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * @author Byron.Y.Y
 * @date 2016年10月12日
 */
@Controller
public class HelloSpringBootController {

    @RequestMapping("/hello")
    @ResponseBody
    public String hello() {
        return "Hello, SpringBoot!";
    }
}

高级篇

第一步，加入数据库连接

添加mysql的maven依赖

 <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.1</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.0.20</version>
</dependency>

application.properties 添加下面信息

mybatis.config-locations=classpath:mybatis/mybatis-config.xml
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml

然后编写dao和mapper xml

package com.springboot.demo.mapper;

import com.springboot.demo.AppDictDO;

import java.util.List;

/**
 * Created by maoshaohui [maoshh88@gmail.com] on 2018/11/30.5:29 PM
 */
public interface AppDictMapper {
    public List<AppDictDO> getAll();
}

<mapper namespace="com.springboot.demo.mapper.AppDictMapper">
    <resultMap id="BaseResultMap" type="com.springboot.demo.AppDictDO">
        <id column="id" property="id" jdbcType="BIGINT"/>
        <result column="type" property="type" jdbcType="Integer"/>
        <result column="dict_id" property="dict_id" jdbcType="VARCHAR"/>
        <result column="dict_name" property="dict_name" javaType="VARCHAR"/>
        <result column="desc" property="desc" jdbcType="VARCHAR"/>
    </resultMap>

    <sql id="Base_Column_List">
        id, type, dict_id, dict_name, desc
    </sql>

    <select id="getAll" resultMap="BaseResultMap">
        SELECT
        <include refid="Base_Column_List"/>
        FROM app_dict
    </select>


</mapper>

注意，显示注入bean，否则会报错

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

还玉栋坑爹的问题害我找了一天原因，原来是需要在pom.xml文件中配置resource，不然mapper.xml文件就会被漏掉！被漏掉！！被漏掉！！！

异常

 Invalid bound statement (not found): com.springboot.demo.mapper.AppDictMapper.getAll