un8.15:SpringBoot——集成MyBatis+SpringMVC

今天我给大家分享的是SpringBoot集成mybatis+SpringMVC，所需软件：JDK1.8、IDEA、MYSQL。

一、新建项目，之前的博客中有提到，在这里就不多说了，建好后修改pom.xml文件，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>4.0.0modelVersion>
	<parent>
		<groupId>org.springframework.bootgroupId>
		<artifactId>spring-boot-starter-parentartifactId>
		<version>1.5.2.RELEASEversion>
	parent>
 
	<groupId>cn.personal.qin.demogroupId>
	<artifactId>springboot_demoartifactId>
	<version>0.0.1-SNAPSHOTversion>
	<packaging>warpackaging>
 
	<name>springbootname>
	<url>http://maven.apache.orgurl>
 
	<properties>
		<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
		
		<java.version>1.8java.version>
	properties>
 
	<dependencies>
		<dependency>
			<groupId>junitgroupId>
			<artifactId>junitartifactId>
			<scope>testscope>
		dependency>
		
		<dependency>
			<groupId>org.springframework.bootgroupId>
			<artifactId>spring-boot-starter-webartifactId>
		dependency>
		
		<dependency>
			<groupId>mysqlgroupId>
			<artifactId>mysql-connector-javaartifactId>
		dependency>
		
		<dependency>
			<groupId>org.mybatis.spring.bootgroupId>
			<artifactId>mybatis-spring-boot-starterartifactId>
			<version>1.3.2version>
		dependency>
		<dependency>
			<groupId>org.mybatisgroupId>
			<artifactId>mybatis-springartifactId>
			<version>1.3.1version>
		dependency>
		<dependency>
			<groupId>org.mybatisgroupId>
			<artifactId>mybatisartifactId>
			<version>3.5.0version>
		dependency>
		
		
		<dependency>
			<groupId>com.jolboxgroupId>
			<artifactId>bonecp-springartifactId>
			<version>0.8.0.RELEASEversion>
		dependency>
		
		<dependency>
			<groupId>org.springframeworkgroupId>
			<artifactId>spring-txartifactId>
		dependency>
		<dependency>
			<groupId>org.springframeworkgroupId>
			<artifactId>spring-jdbcartifactId>
		dependency>
		<dependency>
			<groupId>org.springframeworkgroupId>
			<artifactId>spring-aspectsartifactId>
		dependency>
		
		<dependency>
			<groupId>org.apache.tomcat.embedgroupId>
			<artifactId>tomcat-embed-jasperartifactId>
			<scope>providedscope>
		dependency>
		
	dependencies>
 
	<build>
		<finalName>${project.artifactId}finalName>
		<plugins>
			
			<plugin>
				<groupId>org.apache.maven.pluginsgroupId>
				<artifactId>maven-resources-pluginartifactId>
				<configuration>
					<encoding>UTF-8encoding>
				configuration>
			plugin>
			
			<plugin>
				<groupId>org.apache.maven.pluginsgroupId>
				<artifactId>maven-compiler-pluginartifactId>
				<configuration>
					<source>1.7source>
					<target>1.7target>
					<encoding>UTF-8encoding>
				configuration>
			plugin>
			
			<plugin>
				<groupId>org.springframework.bootgroupId>
				<artifactId>spring-boot-maven-pluginartifactId>
			plugin>
			
		plugins>
		<pluginManagement>
			<plugins>
				
				<plugin>
					<groupId>org.apache.tomcat.mavengroupId>
					<artifactId>tomcat7-maven-pluginartifactId>
					<version>2.2version>
				plugin>
			plugins>
		pluginManagement>
	build>
project>

二、创建包，创建controller类，如下：


package org.personal.qin.demo;
 
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
 
@Controller //springmvc的controller控制器
@SpringBootApplication //springboot核心注解，目的是开启自动配置，scan会自动扫描该类所在的包或者子包
@Configuration
public class MainApplication {
 
	@RequestMapping("hello")
	@ResponseBody
	public String hello() {
		return "hello world！";
	}
 
	public static void main(String[] args) {
		SpringApplication.run(MainApplication.class, args);
    }
}

通过代码可以发现，hello方法是一个controller方法，我们通过浏览器访问hello就可以访问该controller。由于SpringBoot内置了Tomcat所以Web项目不需要部署，直接运行即可：鼠标右键-->run as-->Java Application

三、测试，网址：http://127.0.0.1:8080/hello

四、将配置文件拷贝到src/main/resources文件夹中。

五、配置mybatis。

1、MyBatis目录配置类Cast，Cast.java类的作用是用于配置MyBatis中配置文件及mapper、pom的位置。


package org.personal.qin.demo.config;
 
public class Cast {
	//配置MyBatis
	public static final String MYBATIS_CONFIG = "classpath:mybatis-config.xml";
	public static final String PO_PACKAGE = "org.personal.qin.demo.po";
	public static final String MAPPER_PACKAGE = "org.personal.qin.demo.mapper";
	public static final String MAPPER_SCANNER = "classpath:config/mapper/*.xml";
 
}

2、MyBatis加载配置文件及配置数据源MyBatisConfig，MyBatisConfig.java类的作用是加载MyBatis配置文件，并配置数据源。


package org.personal.qin.demo.config;
 
import javax.sql.DataSource;
 
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.boot.autoconfigure.SpringBootVFS;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
 
@Configuration
public class MyBatisConfig {
	
    /**
     * ConditionalOnMissingBean当容器里没有指定的Bean的情况下创建该对象
     */
    @Bean
    @ConditionalOnMissingBean
    public SqlSessionFactory sqlSessionFactoryBean(DataSource dataSource) throws Exception {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        // 设置数据源
        sqlSessionFactoryBean.setDataSource(dataSource);
        // 添加一行如下代码,解决setTypeAliasesPackage别名设置不起作用问题
        sqlSessionFactoryBean.setVfs(SpringBootVFS.class);
        //设置mybatis的主配置文件
        ResourcePatternResolver resourceResolver = new PathMatchingResourcePatternResolver();
		Resource mybatisConfigXml = resourceResolver.getResource(Cast.MYBATIS_CONFIG);
		sqlSessionFactoryBean.setConfigLocation(mybatisConfigXml);
		// 设置别名包
        sqlSessionFactoryBean.setTypeAliasesPackage(Cast.PO_PACKAGE);
        PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        sqlSessionFactoryBean.setMapperLocations(resolver.getResources(Cast.MAPPER_SCANNER));
        return sqlSessionFactoryBean.getObject();
    }
 
}

3、Mapper扫描MapperScannerConfig，MapperScannerConfig.java类的作用是扫描Mapper。


package org.personal.qin.demo.config;
 
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
/**
 * 保证在MybatisConfig类实例化后才实例化此方法
 */
@Configuration
@AutoConfigureAfter(MyBatisConfig.class)
public class MapperScannerConfig {
	
    /**
     * mapper接口的扫描器
     * 
     * @return
     */
    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer() {
        MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
        mapperScannerConfigurer.setBasePackage(Cast.MAPPER_PACKAGE);
        return mapperScannerConfigurer;
    }
 
}

五、配置SpringBoot。

BootApplication.java文件的作用是配置SpringBoot，并加载jdbc配置文件，配置数据库及数据库连接池，MainApplication.java提供了main方法，是该程序的入口以供程序运行。


package org.personal.qin.demo.config;
 
import javax.sql.DataSource;
 
import com.jolbox.bonecp.BoneCPDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
 
/**
 * 配置文件读取和扫描
 */
@Configuration
@PropertySource(value = { "classpath:jdbc.properties" })
@ComponentScan(basePackages = "org.personal.qin.demo")
@SpringBootApplication
public class BootApplication {
 
	@Value("${jdbc.driver}")
	private String driverClassName; // 数据库驱动
 
	@Value("${jdbc.url}")
	private String url; // 相应驱动的jdbcUrl
 
	@Value("${jdbc.username}")
	private String username; // 数据库的用户名
 
	@Value("${jdbc.password}")
	private String password; // 数据库的密码
	
	@Value("${jdbc.period_in_minutes}")
	private int periodInMinutes; // 检查数据库连接池中空闲连接的间隔时间，单位是分，默认值：240，如果要取消则设置为0
	
	@Value("${jdbc.max_age_in_minutes}")
	private int maxAgeInMinutes; // 连接池中未使用的链接最大存活时间，单位是分，默认值：60，如果要永远存活设置为0
	
	@Value("${jdbc.max_connections_per_partition}")
	private int maxConnectionsPerPartition; // 每个分区最大的连接数
	
	@Value("${jdbc.min_connections_per_partition}")
	private int minConnectionsPerPartition; // 每个分区最小的连接数
 
	/**
	 * 配置数据源
	 * 
	 * @return
	 */
	@Bean(destroyMethod = "close")
	public DataSource dataSource() {
		BoneCPDataSource boneCPDataSource = new BoneCPDataSource();
        boneCPDataSource.setDriverClass(driverClassName);
        boneCPDataSource.setJdbcUrl(url);
        boneCPDataSource.setUsername(username);
        boneCPDataSource.setPassword(password);
        boneCPDataSource.setIdleConnectionTestPeriodInMinutes(periodInMinutes);
        boneCPDataSource.setIdleMaxAgeInMinutes(maxAgeInMinutes);
        boneCPDataSource.setMaxConnectionsPerPartition(maxConnectionsPerPartition);
        boneCPDataSource.setMinConnectionsPerPartition(minConnectionsPerPartition);
        return boneCPDataSource;
	}
 
	protected SpringApplicationBuilder springApplicationBuilder(SpringApplicationBuilder builder) {
		return builder.sources(BootApplication.class);
	}
 
}

六、开始编写业务层代码Pojo、Mapper、Controller

1、Pojo
User.java是Pojo


package org.personal.qin.demo.po;
 
public class User {
 
    private int id;
    private String name;
    private String password;
 
    public int getId() {
        return id;
    }
 
    public void setId(int id) {
        this.id = id;
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public String getPassword() {
        return password;
    }
 
    public void setPassword(String password) {
        this.password = password;
    }
 
    @Override
    public String toString() {
        return "【User】: name=" + name + ", password=" + password;
    }
 
}

2、Mapper
UserMapper.java是Mapper接口，UserMapper.xml是操作数据库的配置文件。


package org.personal.qin.demo.mapper;
 
import java.util.List;
 
import org.personal.qin.demo.po.User;
 
public interface UserMapper {
 
    /**
     * 获取全部用户
     * 
     * @return
     */
    List<User> listAll();
 
}
 
mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="org.personal.qin.demo.mapper.UserMapper">
    <select id="listAll" resultType="User">
        select * from t_user
    select>
mapper>

3、Controller
UserController.java是控制器，提供给web访问


package org.personal.qin.demo.controller;
 
import java.util.List;
 
import org.personal.qin.demo.mapper.UserMapper;
import org.personal.qin.demo.po.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
 
@Controller
public class UserController {
 
    @Autowired
    private UserMapper mapper;
 
    @RequestMapping("/users")
    @ResponseBody
    public Object getAllUser() {
        List users = mapper.listAll();
        return users;
    }
 
}

七、浏览器测试，网址：http://127.0.0.1:8080/users
运行MainApplication.java中的main方法

八、在配置包下添加springMVCconfig。


package org.personal.qin.demo.config;
 
import java.nio.charset.Charset;
import java.util.List;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
 
@Configuration //申明这是一个配置
public class SrpingMVCConfig extends WebMvcConfigurerAdapter {
 
	/**
	 * 自定义拦截器
	 */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        HandlerInterceptor handlerInterceptor = new HandlerInterceptor() {
            @Override
            public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
                    throws Exception {
                System.out.println("自定义拦截器............");
                return true;
            }
            
            @Override
            public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                    ModelAndView modelAndView) throws Exception {
                
            }
            
            @Override
            public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler,
                    Exception ex) throws Exception {
            }
        };
        registry.addInterceptor(handlerInterceptor).addPathPatterns("/**");
    }
 
    /**
     * 自定义消息转化器的第二种方法
     */
    @Override
    public void configureMessageConverters(List> converters) {
        StringHttpMessageConverter converter  = new StringHttpMessageConverter(Charset.forName("UTF-8"));
        converters.add(converter);
    }
}

九、测试，运行MainApplication.java中的main方法。

如此，我们便在springboot中集成了mybatis和springVMC，快行动起来试试。

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原文地址：https://blog.csdn.net/m0_64818669/article/details/126343742