Spring使用JavaConfig配置声明式事务管理

pom.xml：

<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>

    <groupId>com.springdemogroupId>
    <artifactId>spring01artifactId>
    <version>0.0.1-SNAPSHOTversion>
    <packaging>jarpackaging>

    <name>spring01name>
    <url>http://maven.apache.orgurl>

    <properties>
        <spring.version>4.3.8.RELEASEspring.version>
        <spring.security.version>4.2.3.RELEASEspring.security.version>
        <junit.version>4.12junit.version>
        <jdk.version>1.8jdk.version>
        <jsp.version>2.2jsp.version>
        <servlet.version>3.1.0servlet.version>
        <jstl.version>1.2jstl.version>
        <slf4j-version>1.7.25slf4j-version>

        <hamcrest.core.version>1.3hamcrest.core.version>
        <mockito.core.version>2.8.9mockito.core.version>
    properties>

    <dependencies>
        <dependency>
            <groupId>junitgroupId>
            <artifactId>junitartifactId>
            <version>3.8.1version>
            <scope>testscope>
        dependency>

        <dependency>
            <groupId>org.hamcrestgroupId>
            <artifactId>hamcrest-coreartifactId>
            <version>${hamcrest.core.version}version>
            <scope>testscope>
        dependency>

        <dependency>
            <groupId>org.mockitogroupId>
            <artifactId>mockito-coreartifactId>
            <version>${mockito.core.version}version>
            <scope>testscope>
        dependency>

        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-testartifactId>
            <version>${spring.version}version>
            <scope>testscope>
        dependency>

        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-coreartifactId>
            <version>${spring.version}version>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-beansartifactId>
            <version>${spring.version}version>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-context-supportartifactId>
            <version>${spring.version}version>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-contextartifactId>
            <version>${spring.version}version>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-expressionartifactId>
            <version>${spring.version}version>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-aopartifactId>
            <version>${spring.version}version>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-aspectsartifactId>
            <version>${spring.version}version>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-instrumentartifactId>
            <version>${spring.version}version>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-instrument-tomcatartifactId>
            <version>${spring.version}version>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-webartifactId>
            <version>${spring.version}version>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-webmvcartifactId>
            <version>${spring.version}version>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-webmvcartifactId>
            <version>${spring.version}version>
        dependency>
        <dependency>
            <groupId>org.springframework.securitygroupId>
            <artifactId>spring-security-webartifactId>
            <version>${spring.security.version}version>
        dependency>
        <dependency>
            <groupId>org.springframework.securitygroupId>
            <artifactId>spring-security-configartifactId>
            <version>${spring.security.version}version>
        dependency>

        <dependency>
            <groupId>javax.servletgroupId>
            <artifactId>jstlartifactId>
            <version>${jstl.version}version>
        dependency>

        <dependency>
            <groupId>javax.servletgroupId>
            <artifactId>javax.servlet-apiartifactId>
            <version>${servlet.version}version>
            <scope>providedscope>
        dependency>

        <dependency>
            <groupId>javax.servlet.jspgroupId>
            <artifactId>jsp-apiartifactId>
            <version>${jsp.version}version>
            <scope>providedscope>
        dependency>

        <dependency>
            <groupId>javaxgroupId>
            <artifactId>javaee-web-apiartifactId>
            <version>7.0version>
            <scope>providedscope>
        dependency>

        <dependency>
            <groupId>commons-langgroupId>
            <artifactId>commons-langartifactId>
            <version>2.6version>
        dependency>

        <dependency>
            <groupId>org.freemarkergroupId>
            <artifactId>freemarkerartifactId>
            <version>2.3.20version>
        dependency>
        <dependency>
            <groupId>org.apache.commonsgroupId>
            <artifactId>commons-dbcp2artifactId>
            <version>2.1.1version>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-jdbcartifactId>
            <version>${spring.version}version>
        dependency>
        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <version>6.0.6version>
        dependency>
        <dependency>
            <groupId>org.mybatisgroupId>
            <artifactId>mybatisartifactId>
            <version>3.2.1version>
        dependency>
        <dependency>
            <groupId>org.mybatisgroupId>
            <artifactId>mybatis-springartifactId>
            <version>1.3.1version>
        dependency>
        <dependency>
            <groupId>org.slf4jgroupId>
            <artifactId>slf4j-apiartifactId>
            <version>${slf4j-version}version>
        dependency>
        <dependency>
            <groupId>ch.qos.logbackgroupId>
            <artifactId>logback-classicartifactId>
            <version>1.2.3version>
        dependency>
        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>druidartifactId>
            <version>1.1.6version>
        dependency>

    dependencies>
    <build>
        <finalName>spring01finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.pluginsgroupId>
                <artifactId>maven-compiler-pluginartifactId>
                <version>3.6.1version>
                <configuration>
                    <source>${jdk.version}source>
                    <target>${jdk.version}target>
                configuration>
            plugin>
        plugins>
    build>
project>

AppConfig.java

import javax.sql.DataSource;

import org.springframework.context.annotation.Bean;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;

import com.alibaba.druid.pool.DruidDataSource;

@Configuration
@ComponentScan("com.springdemo.dao")
@EnableTransactionManagement
public class AppConfig1 {

    @Bean
    public DruidDataSource dataSource() {
        DruidDataSource ds = new DruidDataSource();
        ds.setDriverClassName("com.mysql.cj.jdbc.Driver");
        ds.setUrl("jdbc:mysql://localhost:3306/test?characterEncoding=utf8&useSSL=true");
        ds.setUsername("root");
        ds.setPassword("123456@#");
        ds.setInitialSize(5);
        return ds;
    }

    @Bean
    public DataSourceTransactionManager dataSourceTransactionManager() {
        return new DataSourceTransactionManager(dataSource());
    }

    @Bean
    public JdbcTemplate jdbcTemplate(DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }

}

User.java

public interface User {
    public void query();

}

实现类UserImpl.java

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;

import com.springdemo.bean.User;

@Component("user")
public class UserImpl implements User {
    @Autowired
    JdbcTemplate template;

    @Transactional
    @Override
    public void query() {
        String sql = "select count(*)  from users";
        Long num = (long) template.queryForObject(sql, Long.class);
        System.out.println(num);
    }

}

App.java

public class App {
    public static void main(String[] args) {
        @SuppressWarnings("resource")
        ApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);       
        User user = (User) context.getBean("user");
        user.query();
    }
}

解析一下：
注解@EnableTransactionManagement通知Spring,@Transactional注解的类被事务的切面包围。这样@Transactional就可以使用了。

ps：
1、一个java配置类加上另外一个配置类使用@Import(AppConfig1.class)，AppConfig1可以不加@Configuration注解
2、@ComponentScan(“com.springdemo.dao”)，AppConfig1在com.springdemo.dao包下或者子包下，可以不使用@Import注解，但是必须加@Configuration注解