构建第一个Spring Boot2.0应用之集成mybatis、Druid（七）

一、环境：

IDE：IntelliJ IDEA 2017.1.1

JDK:1.8.0_161

Maven:3.3.9

springboot:2.0.2.RELEASE

二、说明：

     本文综合之前的两篇博文，将mybatis、druid同时集成到spring boot框架，展示集成的步骤和效果。

三、步骤方法：

1.使用IntelliJ IDEA创建spring boot项目（过程略），创建后项目工程如下。

 

2.配置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.yy</groupId>
    <artifactId>sbmybatisdruid</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>sbmybatisdruid</name>
    <description>Demo project for Spring Boot</description>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.2.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</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>

        <!--mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        </dependency>
        <!--druid数据库连接池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.0</version>
        </dependency>
        <!--mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>

        <!--thymeleaf依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <!--热部署依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
        <!-- 加入log4j支持 -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>RELEASE</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>
            <!-- mybatis generator 自动生成代码插件 -->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.2</version>
                <configuration>
                    <!--<configurationFile>src/main/resources/generatorConfig.xml</configurationFile>-->
                    <overwrite>true</overwrite>
                    <verbose>true</verbose>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

3.application.properties

server.port=8888
# 数据库访问配置
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=gbk&zeroDateTimeBehavior=convertToNull&useSSL=false
spring.datasource.username=root
spring.datasource.password=mysql
# 下面为连接池的补充设置，应用到上面所有数据源中
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
# 配置获取连接等待超时的时间
spring.datasource.maxWait=60000
# 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
spring.datasource.timeBetweenEvictionRunsMillis=60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
spring.datasource.filters=stat,wall,log4j
spring.datasource.logSlowSql=true

#设置热部署
#开启热部署
spring.devtools.restart.enabled=true
#重启范围
spring.devtools.restart.additional-paths=src/main/java

#防止Invalid bound statement (not found)
mybatis.mapper-locations= classpath:mapping/*.xml

4.配置mybatis

4.1自动生成generatorConfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
    <!-- 数据库驱动:选择你的本地硬盘上面的数据库驱动包-->
    <classPathEntry  location="D:\java\mysql-connector-java-5.1.17.jar"/>
    <context id="DB2Tables"  targetRuntime="MyBatis3">
        <commentGenerator>
            <property name="suppressDate" value="true"/>
            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>
        <!--数据库链接URL，用户名、密码 -->
        <!-- JDBC连接 -->
        <jdbcConnection
                driverClass="com.mysql.jdbc.Driver"
                connectionURL="jdbc:mysql://localhost:3306/test"
                userId="${spring.datasource.username}"
                password="${spring.datasource.password}">
        </jdbcConnection>
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!-- 生成模型的包名和位置-->
        <javaModelGenerator targetPackage="com.yy.entity" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!-- 生成映射文件的包名和位置-->
        <sqlMapGenerator targetPackage="mapping" targetProject="src/main/resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!-- 生成DAO的包名和位置-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.yy.mapper" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名-->
        <table tableName="user_info" domainObjectName="UserInfo" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
    </context>
</generatorConfiguration>

4.2配置maven启动

               

启动mybatis自动生成mapper、model、mapping相关，

生成的Model（UserInfo.java），如下

package com.yy.entity;

public class UserInfo {
    private Integer id;

    private String name;

    private Integer age;

    private Integer sex;

    private String province;

    private String city;

    private String job;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name == null ? null : name.trim();
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Integer getSex() {
        return sex;
    }

    public void setSex(Integer sex) {
        this.sex = sex;
    }

    public String getProvince() {
        return province;
    }

    public void setProvince(String province) {
        this.province = province == null ? null : province.trim();
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city == null ? null : city.trim();
    }

    public String getJob() {
        return job;
    }

    public void setJob(String job) {
        this.job = job == null ? null : job.trim();
    }
}

生成的Mapper（UserInfoMapper），如下

package com.yy.mapper;

import com.yy.entity.UserInfo;
import org.springframework.stereotype.Repository;

@Repository
public interface UserInfoMapper {
    int deleteByPrimaryKey(Integer id);

    int insert(UserInfo record);

    int insertSelective(UserInfo record);

    UserInfo selectByPrimaryKey(Integer id);

    int updateByPrimaryKeySelective(UserInfo record);

    int updateByPrimaryKey(UserInfo record);
}

生成的Mapping（UserInfoMapper.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.yy.mapper.UserInfoMapper" >
  <resultMap id="BaseResultMap" type="com.yy.entity.UserInfo" >
    <id column="id" property="id" jdbcType="INTEGER" />
    <result column="name" property="name" jdbcType="VARCHAR" />
    <result column="age" property="age" jdbcType="INTEGER" />
    <result column="sex" property="sex" jdbcType="INTEGER" />
    <result column="province" property="province" jdbcType="VARCHAR" />
    <result column="city" property="city" jdbcType="VARCHAR" />
    <result column="job" property="job" jdbcType="VARCHAR" />
  </resultMap>
  <sql id="Base_Column_List" >
    id, name, age, sex, province, city, job
  </sql>
  <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
    select
    <include refid="Base_Column_List" />
    from user_info
    where id = #{id,jdbcType=INTEGER}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
    delete from user_info
    where id = #{id,jdbcType=INTEGER}
  </delete>
  <insert id="insert" parameterType="com.yy.entity.UserInfo" >
    insert into user_info (id, name, age,
      sex, province, city,
      job)
    values (#{id,jdbcType=INTEGER}, #{name,jdbcType=VARCHAR}, #{age,jdbcType=INTEGER},
      #{sex,jdbcType=INTEGER}, #{province,jdbcType=VARCHAR}, #{city,jdbcType=VARCHAR},
      #{job,jdbcType=VARCHAR})
  </insert>
  <insert id="insertSelective" parameterType="com.yy.entity.UserInfo" >
    insert into user_info
    <trim prefix="(" suffix=")" suffixOverrides="," >
      <if test="id != null" >
        id,
      </if>
      <if test="name != null" >
        name,
      </if>
      <if test="age != null" >
        age,
      </if>
      <if test="sex != null" >
        sex,
      </if>
      <if test="province != null" >
        province,
      </if>
      <if test="city != null" >
        city,
      </if>
      <if test="job != null" >
        job,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides="," >
      <if test="id != null" >
        #{id,jdbcType=INTEGER},
      </if>
      <if test="name != null" >
        #{name,jdbcType=VARCHAR},
      </if>
      <if test="age != null" >
        #{age,jdbcType=INTEGER},
      </if>
      <if test="sex != null" >
        #{sex,jdbcType=INTEGER},
      </if>
      <if test="province != null" >
        #{province,jdbcType=VARCHAR},
      </if>
      <if test="city != null" >
        #{city,jdbcType=VARCHAR},
      </if>
      <if test="job != null" >
        #{job,jdbcType=VARCHAR},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="com.yy.entity.UserInfo" >
    update user_info
    <set >
      <if test="name != null" >
        name = #{name,jdbcType=VARCHAR},
      </if>
      <if test="age != null" >
        age = #{age,jdbcType=INTEGER},
      </if>
      <if test="sex != null" >
        sex = #{sex,jdbcType=INTEGER},
      </if>
      <if test="province != null" >
        province = #{province,jdbcType=VARCHAR},
      </if>
      <if test="city != null" >
        city = #{city,jdbcType=VARCHAR},
      </if>
      <if test="job != null" >
        job = #{job,jdbcType=VARCHAR},
      </if>
    </set>
    where id = #{id,jdbcType=INTEGER}
  </update>
  <update id="updateByPrimaryKey" parameterType="com.yy.entity.UserInfo" >
    update user_info
    set name = #{name,jdbcType=VARCHAR},
      age = #{age,jdbcType=INTEGER},
      sex = #{sex,jdbcType=INTEGER},
      province = #{province,jdbcType=VARCHAR},
      city = #{city,jdbcType=VARCHAR},
      job = #{job,jdbcType=VARCHAR}
    where id = #{id,jdbcType=INTEGER}
  </update>
</mapper>

5.项目启动类，SbmybatisdruidApplication.java

package com.yy;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;

@SpringBootApplication
//启动类中添加对mapper包扫描@MapperScan
@MapperScan(value = "com.yy.mapper")
public class SbmybatisdruidApplication {

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

6.Druid数据源配置（DruidConfig.java)

package com.yy.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;
import java.sql.SQLException;

/**
 * Created by Administrator on 2018-06-06.
 */
@Configuration
public class DruidConfig {

    private Logger logger = LoggerFactory.getLogger(DruidConfig.class);

    @Value("${spring.datasource.url}")
    private String dbUrl;

    @Value("${spring.datasource.username}")
    private String username;

    @Value("${spring.datasource.password}")
    private String password;

    @Value("${spring.datasource.driver-class-name}")
    private String driverClassName;

    @Value("${spring.datasource.initialSize}")
    private int initialSize;

    @Value("${spring.datasource.minIdle}")
    private int minIdle;

    @Value("${spring.datasource.maxActive}")
    private int maxActive;

    @Value("${spring.datasource.maxWait}")
    private int maxWait;

    @Value("${spring.datasource.timeBetweenEvictionRunsMillis}")
    private int timeBetweenEvictionRunsMillis;

    @Value("${spring.datasource.minEvictableIdleTimeMillis}")
    private int minEvictableIdleTimeMillis;

    @Value("${spring.datasource.validationQuery}")
    private String validationQuery;

    @Value("${spring.datasource.testWhileIdle}")
    private boolean testWhileIdle;

    @Value("${spring.datasource.testOnBorrow}")
    private boolean testOnBorrow;

    @Value("${spring.datasource.testOnReturn}")
    private boolean testOnReturn;

    @Value("${spring.datasource.filters}")
    private String filters;

    @Value("${spring.datasource.logSlowSql}")
    private String logSlowSql;

    @Bean
    public ServletRegistrationBean druidServlet() {
        ServletRegistrationBean reg = new ServletRegistrationBean();
        reg.setServlet(new StatViewServlet());
        reg.addUrlMappings("/druid/*");
        reg.addInitParameter("loginUsername", username);
        reg.addInitParameter("loginPassword", password);
        reg.addInitParameter("logSlowSql", logSlowSql);
        return reg;
    }

    @Bean
    public FilterRegistrationBean filterRegistrationBean() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        filterRegistrationBean.setFilter(new WebStatFilter());
        filterRegistrationBean.addUrlPatterns("/*");
        filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
        filterRegistrationBean.addInitParameter("profileEnable", "true");
        return filterRegistrationBean;
    }

    @Bean
    public DataSource druidDataSource() {
        DruidDataSource datasource = new DruidDataSource();
        datasource.setUrl(dbUrl);
        datasource.setUsername(username);
        datasource.setPassword(password);
        datasource.setDriverClassName(driverClassName);
        datasource.setInitialSize(initialSize);
        datasource.setMinIdle(minIdle);
        datasource.setMaxActive(maxActive);
        datasource.setMaxWait(maxWait);
        datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
        datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
        datasource.setValidationQuery(validationQuery);
        datasource.setTestWhileIdle(testWhileIdle);
        datasource.setTestOnBorrow(testOnBorrow);
        datasource.setTestOnReturn(testOnReturn);
        try {
            datasource.setFilters(filters);
        } catch (SQLException e) {
            logger.error("druid configuration initialization filter", e);
        }
        return datasource;
    }

}

三、测试

3.1.编写Controller（HelloController.java）

package com.yy.controller;

import com.yy.entity.UserInfo;
import com.yy.mapper.UserInfoMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.ModelAndView;

/**
 * Created by Administrator on 2018-06-06.
 */
@RestController
@RequestMapping(value="/users")
public class HelloController {

    @Autowired
    UserInfoMapper userInfoMapper;

    @RequestMapping(value = "/getById/{id}")
    private ModelAndView getUserById(@PathVariable(value="id") Integer Id)
    {
        ModelAndView mv=new ModelAndView();
        UserInfo userInfo= userInfoMapper.selectByPrimaryKey(Id);
        mv.addObject("userinfo",userInfo);
        mv.setViewName("index");
        return mv;
    }
}

问题一：

出现问题提示：Could not autowire. No beans of 'UserInfoMapper' type found. less... (Ctrl+F1)    Checks autowiring problems in a bean class.

解决：UserInfoMapper类添加@Repository注解

问题二：

出现问题提示：Field userInfoMapper in com.yy.controller.HelloController required a bean of type 'com.yy.mapper.UserInfoMapper' that could not be found.

在启动类添加@MapperScan("com.yy.mapper")注解

问题三.

问题提示：org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.yy.mapper.UserInfoMapper.selectByPrimaryKey

解决：在application.properties中添加生成的xml的位置

3.2运行项目

3.2.1 浏览器访问http://localhost:8888/druid/login.html，打开Druid监控页面

登录后，可查看监控界面如下

3.2.2，访问controler中的getById，http://localhost:8888/users/getById/3

index.html页面模板信息为

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>spring boot</h1>
   用户信息：<div th:text="${userinfo.name}">姓名</div>
<div th:text="${userinfo.age}">年龄</div>
<div th:text="${userinfo.job}">工作</div>
</body>
</html>

查询id为3的用户信息，查询成功，返回用户信息，并在index.html中显示查询出来的用户信息。

3.2.3 查看数据库访问监控

上面执行一条查询后，在druid监控页面查看监控情况，如下：

点开上面查询语句，查看详情，

完毕！

示例源码