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spring boot+mybatis整合

spring boot+mybatis整合

作者: colin_default | 来源:发表于2019-02-20 16:17 被阅读0次

一、java web开发环境搭建

网上有很多教程，参考教程：http://www.cnblogs.com/Leo_wl/p/4752875.html

二、Spring boot搭建

1、Intellij idea菜单栏File->new->project。

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2、选择左侧栏中spring initializr，右侧选择jdk版本，以及默认的Service URL，点击next。

image

/3、然后填写项目的Group、Artifact等信息，helloworld阶段选默认就可以了，点击next。

image

4、左侧点击Web，中间一侧选择Web，然后左侧选择SQL，中间一侧选择JPA、Mybatis、MYSQL（LZ数据库用的是mysql，大家可以选择其他DB），点击next。

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5、填写Project name 等信息，然后点击Finish。

image

至此，一个maven web项目就创建好了，目录结构如下：

image

这样，Spring boot就搭建好了，pom.xml里已经有了Spring boot的jar包，包括我们的mysql数据连接的jar包。Spring boot内置了类似tomcat这样的中间件，所以，只要运行DemoApplication中的main方法就可以启动项目了。我们测试一下。

在src/main/java下新建目录com/demo/entity/User。

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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">package com.demo.entity; public class User { private String name; public String getName() { return name;
} public void setName(String name) { this.name = name;
}
}</pre>

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相同目录下新建com/demo/controller/TestBootController。

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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">package com.demo.controller; import com.demo.entity.User; import org.springframework.boot.autoconfigure.EnableAutoConfiguration; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController;

@RestController
@EnableAutoConfiguration
@RequestMapping("/testboot") public class TestBootController {
@RequestMapping("getuser") public User getUser() {
User user = new User();
user.setName("test"); return user;
}
}</pre>

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spring boot启动DemoAplication是需要扫描它下面的Controller等类的，所以将DemoApplication移动到com/demo目录下。还有就是Spring boot启动默认是要加载数据源的，所以我们在src/main/resources下新建application.yml：

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<textarea style="margin: 0px; padding: 0px; list-style-type: none; list-style-image: none; font: 12px/1.5 "Courier New"; width: 689px; height: 403.2px;"></textarea>

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或者将pom.xml中加载数据源的jar包先注释掉也可以。

<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">/<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.0</version>
</dependency>/</pre>

最终的目录结构如下，

image

启动DemoApplication的main方法，访问http://localhost:8080/testboot/getuser即可。

image

三、整合Mybatis

1、集成druid，使用连接池。pom.xml中添加：

<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;"><dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.0</version>
</dependency></pre>

最终的pom.xml文件：

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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;"><?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.arm</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

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

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.8.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-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>1.3.1</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </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>

    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.1.0</version>
    </dependency>

</dependencies>

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

</project></pre>

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在application.yml中添加数据源、Mybatis的实体和配置文件位置。

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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">#默认使用配置
spring:
profiles:
active: dev

公共配置与profiles选择无关 mapperLocations指的路径是src/main/resources

mybatis:
typeAliasesPackage: com.xdd.entity
mapperLocations: classpath:mapper/*.xml

开发配置

spring:
profiles: dev

datasource:
url: jdbc:mysql://localhost:3306/test
username: root
password: root
driver-class-name: com.mysql.jdbc.Driver
# 使用druid数据源
type: com.alibaba.druid.pool.DruidDataSource</pre>

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就这样就整合完成了！我们测试一下。

用MyBatis Generator自动生成代码，参考博文：http://blog.csdn.net/zhshulin/article/details/23912615 这里列一下自动生成的代码。

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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">import com.xdd.entity.User; import org.springframework.stereotype.Component; public interface UserDao { int deleteByPrimaryKey(Integer id); int insert(User record); int insertSelective(User record);

User selectByPrimaryKey(Integer id); int updateByPrimaryKeySelective(User record); int updateByPrimaryKey(User record);

}</pre>

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UserMapper.xml

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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;"><?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.xdd.dao.UserDao" >
<resultMap id="BaseResultMap" type="com.xdd.entity.User" >
<id column="id" property="id" jdbcType="INTEGER" />
<result column="user_name" property="userName" jdbcType="VARCHAR" />
<result column="password" property="password" jdbcType="VARCHAR" />
<result column="age" property="age" jdbcType="INTEGER" />
</resultMap>
<sql id="Base_Column_List" > id, user_name, password, age </sql>
<select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" > select <include refid="Base_Column_List" /> from user_t
where id = #{id,jdbcType=INTEGER} </select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" > delete from user_t
where id = #{id,jdbcType=INTEGER} </delete>
<insert id="insert" parameterType="com.xdd.entity.User" > insert into user_t (id, user_name, password,
age)
values (#{id,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR},
#{age,jdbcType=INTEGER}) </insert>
<insert id="insertSelective" parameterType="com.xdd.entity.User" > insert into user_t <trim prefix="(" suffix=")" suffixOverrides="," >
<if test="id != null" > id, </if>
<if test="userName != null" > user_name, </if>
<if test="password != null" > password, </if>
<if test="age != null" > age, </if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides="," >
<if test="id != null" > #{id,jdbcType=INTEGER}, </if>
<if test="userName != null" > #{userName,jdbcType=VARCHAR}, </if>
<if test="password != null" > #{password,jdbcType=VARCHAR}, </if>
<if test="age != null" > #{age,jdbcType=INTEGER}, </if>
</trim>
</insert>
<update id="updateByPrimaryKeySelective" parameterType="com.xdd.entity.User" > update user_t <set >
<if test="userName != null" > user_name = #{userName,jdbcType=VARCHAR}, </if>
<if test="password != null" > password = #{password,jdbcType=VARCHAR}, </if>
<if test="age != null" > age = #{age,jdbcType=INTEGER}, </if>
</set> where id = #{id,jdbcType=INTEGER} </update>
<update id="updateByPrimaryKey" parameterType="com.xdd.entity.User" > update user_t
set user_name = #{userName,jdbcType=VARCHAR},
password = #{password,jdbcType=VARCHAR},
age = #{age,jdbcType=INTEGER}
where id = #{id,jdbcType=INTEGER} </update>
</mapper></pre>

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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">public class User { private Integer id; private String userName; private String password; private Integer age; public Integer getId() { return id;
} public void setId(Integer id) { this.id = id;
} public String getUserName() { return userName;
} public void setUserName(String userName) { this.userName = userName == null ? null : userName.trim();
} public String getPassword() { return password;
} public void setPassword(String password) { this.password = password == null ? null : password.trim();
} public Integer getAge() { return age;
} public void setAge(Integer age) { this.age = age;
}
}</pre>

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最后将DemoApplication.java修改一下，让其扫描dao层接口。

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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.web.support.SpringBootServletInitializer;

@SpringBootApplication
@MapperScan("com.xdd.dao") public class DemoApplication extends SpringBootServletInitializer{ public static void main(String[] args) {
SpringApplication.run(DemoApplication.class,args);
}
}</pre>

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自己添加controller和service

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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">import java.util.List; import java.util.Map; public interface UserService { public User getUserById(int userId); boolean addUser(User record);

}</pre>

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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import javax.annotation.Resource; import java.util.List; import java.util.Map;

@Service("userService") public class UserServiceImpl implements UserService {

@Resource private UserDao userDao; public User getUserById(int userId) { return userDao.selectByPrimaryKey(userId);
} public boolean addUser(User record){ boolean result = false; try {
        userDao.insertSelective(record);
        result = true;
    } catch (Exception e) {
        e.printStackTrace();
    } return result;
}

}</pre>

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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">@Controller
@RequestMapping("/user") public class UserController {
@Resource private UserService userService;

@RequestMapping("/showUser")
@ResponseBody public User toIndex(HttpServletRequest request, Model model){ int userId = Integer.parseInt(request.getParameter("id"));
    User user = this.userService.getUserById(userId); return user;
}

}</pre>

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浏览器访问http://localhost:8080/user/showUser?id=1

image

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