使用Spring 完成转账业务添加日志功能-编程知识

(完整的代码在文章附带文件中 , 文章里的代码仅作展示 , 可能有部分不完善
代码地址 :下载:https://javazhang.lanzn.com/i5oLI1vyiile 密码:1234
)
任务目标
在这里插入图片描述
具体实现方法和心得

步骤1. 导入依赖项Spring依赖 , aop依赖,德鲁伊依赖,mybatis依赖 , mysql驱动 , mybatis-spring 依赖注意点 mybatis-spring 和 mybatis 的依赖版本有
关联关系 , 需要注意

<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/maven-v4_0_0.xsd"><modelVersion>4.0.0</modelVersion><groupId>org.example</groupId><artifactId>spring-Demo1</artifactId><packaging>war</packaging><version>1.0-SNAPSHOT</version><name>spring-Demo1 Maven Webapp</name><url>http://maven.apache.org</url><dependencies>
<!-- Spring依赖   --><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>5.2.10.RELEASE</version></dependency>
<!--  aop依赖  --><dependency><groupId>org.aspectj</groupId><artifactId>aspectjweaver</artifactId><version>1.9.4</version></dependency>
<!--  德鲁伊依赖  --><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.16</version></dependency>
<!--mybatis依赖  --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.6</version></dependency>
<!--mysql驱动  --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.47</version></dependency>
<!--    mybatis整合spring  和mybais是关联的 属于mybatis的pro   --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>1.3.0</version></dependency><!-- 测试框架依赖   --><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version><scope>test</scope></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>5.2.10.RELEASE</version><scope>compile</scope></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.2.10.RELEASE</version></dependency></dependencies><build><finalName>spring-Demo1</finalName></build>
</project>

步骤2.
编辑Spring配置类 , Jdbc配置类 , Mybatis配置类

package com.zhang.config;import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Controller;@Configuration
@ComponentScan("com.zhang")
@PropertySource("classpath:jdbc.properties")
@Import({MyBatisConfig.class , JdbcConfig.class})
@EnableTransactionManagement
public class SpringConfig {
}

package com.zhang.config;import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.context.annotation.Bean;import javax.sql.DataSource;public class MyBatisConfig {@Beanpublic SqlSessionFactoryBean sqlSessionFactoryBean(DataSource dataSource) {SqlSessionFactoryBean ssfb = new SqlSessionFactoryBean();ssfb.setTypeAliasesPackage("com.zhang.domain");ssfb.setDataSource(dataSource);return ssfb;}@Beanpublic MapperScannerConfigurer mapperScannerConfigurer() {MapperScannerConfigurer msc = new MapperScannerConfigurer();msc.setBasePackage("com.zhang.dao");return msc;}
}心得Mybatis的两个关联路径操作 如果路径错误 ,会导致后面Service无法自动装配

package com.zhang.config;import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;import javax.sql.DataSource;public class JdbcConfig {@Value("${jdbc.driver}")private String driver;@Value("${jdbc.url}")private String url;@Value("${jdbc.username}")private String username;@Value("${jdbc.password}")private String password;@Beanpublic DataSource dataSource() {DruidDataSource ds = new DruidDataSource();ds.setDriverClassName(driver);ds.setUrl(url);ds.setUsername(username);ds.setPassword(password);return ds;}@Beanpublic PlatformTransactionManager transactionManager(DataSource dataSource){DataSourceTransactionManager ptm = new DataSourceTransactionManager();ptm.setDataSource(dataSource);return ptm;}
}}

心得 MybatisConfig的 MapperScannerConfigurer 方法是对数据举行处理代码的绑定SqlSessionFactoryBean 方法是对 数据库中的数据部分代码进行绑定

步骤三:编写数据操作AccountDao 和日志操作 LogDao

package com.zhang.dao;import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Update;public interface AccountDao {@Update("update tbl_account set money = money + #{money} where name = #{name}")void inMoney(@Param("name") String name ,@Param("money") Double money);@Update("update tbl_account set money = money - #{money} where name = #{name}")void outMoney(@Param("name") String name , @Param("money") Double money);}

package com.zhang.dao;import org.apache.ibatis.annotations.Insert;public interface LogDao {@Insert("insert into tbl_log (info, createDate) values(#{info},now())")void log(@Param("info")String info);
}

	心得 : 在LogDao中 Insert 语句用到了一个now() 方法用于在数据库中添加当前时间

步骤四:编写domain包账户方法

package com.itheima.domain;import java.io.Serializable;public class Account implements Serializable {private Integer id;private String name;private Double money;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;}public Double getMoney() {return money;}public void setMoney(Double money) {this.money = money;}@Overridepublic String toString() {return "Account{" +"id=" + id +", name='" + name + '\'' +", money=" + money +'}';}
}

步骤五编写服务层Service , logService 和AccountService
这里用到事务的知识点 , 事务为了保证在程序出现错误时,回滚操作,防止出现更大错误 , 而数据库日志需要在数据库操作有错误时也要执行,不需要回滚 ,所以他的事务要和数据库操作的事务分开 , 分为两个事务

package com.zhang.service;import org.apache.ibatis.annotations.Update;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;public interface LogService {@Transactional(propagation = Propagation.REQUIRES_NEW)void log(String out , String in ,Double money);}

package com.zhang.service;import org.springframework.transaction.annotation.Transactional;public interface AccountService {@Transactional
void transfer(String out , String in ,Double money);
}

package com.zhang.service.imp;import com.zhang.dao.AccountDao;
import com.zhang.service.AccountService;
import com.zhang.service.LogService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;@Service
public class AccountServiceImp implements AccountService {@Autowiredprivate AccountDao accountDao;@Autowiredprivate LogService logService;public void transfer(String out, String in, Double money) {try {accountDao.outMoney(out, money);accountDao.inMoney(in, money);} finally {logService.log(out, in, money);}}
}

package com.zhang.service.imp;import com.zhang.dao.LogDao;
import com.zhang.service.LogService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;@Servicepublic class LogServiceImp implements LogService {@Autowiredprivate LogDao logDao;public void log(String out, String in, Double money) {logDao.log("转账操作由" + out +"到" + in + ",金额" + money);}
}

测试用例

package com.zhang.service;
import com.zhang.config.SpringConfig;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfig.class)
public class AccountServiceTest {@Autowired
private AccountService accountService;@Test
public void testTransfer() {accountService.transfer("Tom" , "Jerry" , 50D);}
}