基于 Spring Boot 的 SSM 环境整合六：整合 mybatis

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/xz2001/article/details/83859492

1、前期准备（构建数据库）

为了测试方便，本文使用sqlite数据库，文件存储位置：d:\website_java4.s3db，使用以下脚本创建测试表及数据：

CREATE TABLE SYS_USER ( 
    USER_CODE           VARCHAR( 36 )   NOT NULL,
    LOGIN_NAME          VARCHAR( 50 )   NOT NULL,
    LOGIN_PWD           VARCHAR( 50 )   NOT NULL,
    USER_LEVEL          TINYINT         NOT NULL
);

INSERT INTO `sys_user` (`USER_CODE`, `LOGIN_NAME`, `LOGIN_PWD`, `USER_LEVEL`) VALUES ('1', 'xz2001', 'xz2001', '1')

2、修改 pom.xml 增加资源

增加关于druid、mybatis和sqlite相关资源：

    <!-- database -->
    <dependency>
		<groupId>com.alibaba</groupId>
		<artifactId>druid</artifactId>
		<version>1.0.31</version>
	</dependency>
	<dependency>
	    <groupId>org.xerial</groupId>
	    <artifactId>sqlite-jdbc</artifactId>
	    <version>3.7.2</version>
	</dependency>
	<!-- 
	<dependency>
	    <groupId>mysql</groupId>
	    <artifactId>mysql-connector-java</artifactId>
	    <version>5.1.42</version>
	</dependency> -->
    <!-- mybatis -->
	<dependency>
	  <groupId>org.mybatis</groupId>
	  <artifactId>mybatis</artifactId>
	  <version>3.4.4</version>
	</dependency>
	<dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>1.3.1</version>
    </dependency>

保存后执行下 Maven install。完成后的pom.xml如下：

<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.whowii</groupId>
  <artifactId>website_java4</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  
  <!-- 引入spring-boot-start-parent 以提供dependency management，也就是依赖管理，引入以后在声明其它dependency的时候就不需要version了 -->
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.3.RELEASE</version>
  </parent>
  
  <dependencies>
  	<!-- 引入spring-boot-starter-web 以包含spring webmvc和tomcat等web开发的特性 -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
      <exclusions>
        <exclusion>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-logging</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
    
    <!-- 连接池 -->
    <dependency>
		<groupId>com.alibaba</groupId>
		<artifactId>druid</artifactId>
		<version>1.0.31</version>
	</dependency>
	<!-- sqlite -->
	<dependency>
	    <groupId>org.xerial</groupId>
	    <artifactId>sqlite-jdbc</artifactId>
	    <version>3.7.2</version>
	</dependency>
	<!-- 
	<dependency>
	    <groupId>mysql</groupId>
	    <artifactId>mysql-connector-java</artifactId>
	    <version>5.1.42</version>
	</dependency> -->
    <!-- mybatis -->
	<dependency>
	  <groupId>org.mybatis</groupId>
	  <artifactId>mybatis</artifactId>
	  <version>3.4.4</version>
	</dependency>
	<dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>1.3.1</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>1.1.1</version>
    </dependency>
    
    <!-- thymeleaf 模板 -->
    <dependency>
      <groupId>org.springframework.boot </groupId>
      <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
    
    <!-- log4j2 -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-log4j2</artifactId>
    </dependency>
    
    <!-- 日志工具
    <dependency>
        <groupId>org.apache.tomcat.embed</groupId>
        <artifactId>tomcat-embed-logging-juli</artifactId>
        <version>8.0.23</version>
    </dependency> -->
    
    <!-- spring mvc -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${spring.version}</version>
    </dependency>
	<dependency>
	    <groupId>org.springframework</groupId>
	    <artifactId>spring-beans</artifactId>
        <version>${spring.version}</version>
	    <type>jar</type>
	</dependency>
	<dependency>
	    <groupId>org.springframework</groupId>
	    <artifactId>spring-orm</artifactId>
        <version>${spring.version}</version>
	    <type>jar</type>
	</dependency>
    
    <!-- aop 依赖 -->
    <dependency>  
        <groupId>org.aspectj</groupId>  
        <artifactId>aspectjrt</artifactId>  
        <version>1.6.11</version>  
    </dependency>  
    <dependency>  
        <groupId>org.aspectj</groupId>  
        <artifactId>aspectjweaver</artifactId>  
        <version>1.6.11</version>  
    </dependency>
  </dependencies>

  <build>
    <finalName>website_java4</finalName>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
      <!-- 增加main方式启动的配置，若使用maven的spring-boot:run方式启动则不需要此配置 -->
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <configuration>
        	<!-- 设置主类入口 -->
        	<mainClass>com.whowii.website4.AppBoot</mainClass>
        	<!-- 设置classpath -->
        	<addClasspath>true</addClasspath>
            <classpathPrefix>lib/</classpathPrefix>
        </configuration>
      </plugin>
    </plugins>
  </build>
  
  <properties>
  	<!-- spring 版本 -->
    <spring.version>4.3.8.RELEASE</spring.version>
    <!-- java 版本 -->
    <java.version>1.8</java.version>
  	<!-- 设置编码 -->
  	<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
</project>

3、增加数据源配置文件

修改spring boot配置文件“application.properties”，完成后的代码如下：

# tomcat 端口
server.port=8080

# spring mvc 配置（视图解析器）
spring.mvc.view.prefix=/WEB-INF/view/
spring.mvc.view.suffix=.jsp

# log4j2 配置
logging.config=classpath\:log4j2.xml

# 关闭thymeleaf缓存，仅在开发时使用
spring.thymeleaf.cache=false
# 检查模板是否存在，然后再呈现
spring.thymeleaf.check-template-location=true
# Content-Type值
spring.thymeleaf.content-type=text/html
# 在构建URL时预先查看名称的前缀
spring.thymeleaf.prefix=classpath:/templates/
# 构建URL时附加查看名称的后缀.
spring.thymeleaf.suffix=.html

# 数据源配置
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driver-class-name=org.sqlite.JDBC
spring.datasource.url=jdbc:sqlite:d:/website_java4.s3db
spring.datasource.username=
spring.datasource.password=
spring.datasource.initialSize=10
spring.datasource.minIdle=10
spring.datasource.maxActive=50
spring.datasource.maxWait=60000
spring.datasource.timeBetweenEvictionRunsMillis=30000
spring.datasource.minEvictableIdleTimeMillis=150000
spring.datasource.validationQuery=SELECT 'x'
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
spring.datasource.removeAbandoned=true
spring.datasource.removeAbandonedTimeout=1800000
spring.datasource.poolPreparedStatements=false
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
spring.datasource.filters=wall,stat


mybatis.mapper-locations=classpath:mapper/sysuser-mapper.xml
mybatis.typeAliasesPackage=com.whowii.website4.admin.model

4、增加 mapper

在资源文件夹“src\main\resources”下增加子目录“mapper”，并增加文件“sysuser-mapper.xml”，内容如下：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"    
"http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">

<mapper namespace="com.whowii.website4.admin.dao.SysUserDao">

	<!-- 定义的resultMap，以解决类的属性名和数据库列名不一致的问题
		其中的type是mybatis配置文件中定义的别名
	-->
	<resultMap id="result" type="com.whowii.website4.admin.model.SysUser">
		<id column="USER_CODE" property="userCode" />
		<result column="LOGIN_NAME" property="loginName" />
		<result column="LOGIN_PWD" property="loginPwd" />
		<result column="USER_LEVEL" property="userLevel" />
	</resultMap>

	<!-- 获取一个用户 -->
	<select id="get" parameterType="string" resultMap="result" >
		SELECT USER_CODE,LOGIN_NAME,LOGIN_PWD,USER_LEVEL FROM SYS_USER WHERE USER_CODE = #{userCode}
	</select>
	
	<!-- 修改用户等级 -->
	<update id="update" parameterType="SysUser">
		UPDATE SYS_USER
		SET USER_LEVEL=#{userLevel}
		WHERE USER_CODE=#{userCode}
	</update>
</mapper>

5、增加实体类

在包“com.whowii.website4.admin.model”中增加类“SysUser.java”，代码如下：

package com.whowii.website4.admin.model;

public class SysUser implements java.io.Serializable {

	private static final long serialVersionUID = 7442514800601880744L;

	private String userCode;
	private String loginName;
	private String loginPwd;
	private Byte userLevel;

	public String getUserCode() {
		return userCode;
	}

	public void setUserCode(String userCode) {
		this.userCode = userCode;
	}

	public String getLoginName() {
		return loginName;
	}

	public void setLoginName(String loginName) {
		this.loginName = loginName;
	}

	public String getLoginPwd() {
		return loginPwd;
	}

	public void setLoginPwd(String loginPwd) {
		this.loginPwd = loginPwd;
	}

	public Byte getUserLevel() {
		return userLevel;
	}

	public void setUserLevel(Byte userLevel) {
		this.userLevel = userLevel;
	}

}

6、增加 dao

在包“com.whowii.website4.admin.dao”中增加类“SysUserDao”，代码如下：

package com.whowii.website4.admin.dao;

import org.apache.ibatis.annotations.Mapper;

import com.whowii.website4.admin.model.SysUser;

//必须加上@Mapper的注解，不然@Autowired将注入失败。
@Mapper
public interface SysUserDao {
	//由用户编码获取用户
	public SysUser get(String userCode);

	// 修改用户等级
	public int update(SysUser user);
}

7、修改服务类及其接口

package com.whowii.website4.admin.service;

public interface DemoService {
	public String getUser(String userCode);
}

package com.whowii.website4.admin.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.whowii.website4.admin.dao.SysUserDao;
import com.whowii.website4.admin.model.SysUser;
import com.whowii.website4.admin.service.DemoService;

@Service("demoService")
public class DemoServiceImpl implements DemoService {
	@Autowired
	private SysUserDao sysUserDao;

	@Override
	public String getUser(String userCode) {
		SysUser u = this.sysUserDao.get(userCode);

		return u == null ? "NULL" : u.getLoginName();
	}
}

8、修改控制器

package com.whowii.website4.admin.controller;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import com.whowii.website4.admin.service.DemoService;

@Controller
@RequestMapping("/demo")
public class DemoController {
	private static final Logger logger = LogManager.getLogger(DemoController.class);
	@Autowired
	private DemoService demoService;

	@GetMapping("/index")
	public String index(Model model) {
		String code = "1";
		String result = this.demoService.getUser(code);
		logger.info("用户编码为：{" + code + "}，返回消息为：{" + result + "}");

		model.addAttribute("username", code);
		model.addAttribute("result", result);

		return "/admin/demo/demo-index";
	}
}

9、测试结果

启动项目，打开浏览器访问“http://127.0.0.1:8080/demo/index”，结果如下：