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springAOP案例

2020-11-23 15:29:14  阅读:177  来源: 互联网

标签:Account accountDao springframework 案例 import springAOP org public


springAOP案例

文章目录


一、基于XML的AOP实现事务控制流程

1.配置pom.xml

<packaging>jar</packaging>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.0.2.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.6</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.9</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>

        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.7</version>
        </dependency>
    </dependencies>

示例:pandas 是基于NumPy 的一种工具,该工具是为了解决数据分析任务而创建的。

二、使用步骤

1.spring事务控制——基于XML(建议使用)

1.配置pom.xml

<packaging>jar</packaging>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.2.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.0.2.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.0.2.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.0.2.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.6</version>
        </dependency>

        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.7</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
    </dependencies>

2.配置bean.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/tx
        https://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd">

    <!-- 配置业务层-->
    <bean id="accountService" class="com.fjut.service.impl.AccountServiceImpl">
        <property name="accountDao" ref="accountDao"></property>
    </bean>

    <!-- 配置账户的持久层-->
    <bean id="accountDao" class="com.fjut.dao.impl.AccountDaoImpl">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--<context:component-scan base-package="com.fjut"></context:component-scan>-->

    <!-- 配置数据源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/springmysql"></property>
        <property name="username" value="root"></property>
        <property name="password" value="root"></property>
    </bean>

    <!--spring中基于XML的声明式事务控制配置
        1.配置事务管理器
        2.配置事务的通知
            我们需要导入事务的约束
        3.配置AOP中的通用切入点表达式
        4.建立事务通知和切入点表达式的对应关系
        5.配置事务的属性(注意:在tx:advice标签内部来配)
            标签:tx:method
    -->
    <!--配置事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    
    <!--配置事务的通知-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <!--配置事务的属性:
            isolation:用于指定事务的隔离级别。默认值:DEFAULT,表示使用数据库的默认隔离级别
            propagation:用于指定事务的传播行为。默认值是REQUIRED,表示一定会有事务,增删改的选择。查询方法可以选择SUPPORTS。
            read-only:用于指定事务是否只读。只有查询方法才能用设置为true。默认值是false,表示读写。
            timeout:用于指定事务的超时时间,默认值是-1,表示永不超时。如果指定了数值,以秒为单位。
            rollback-for:用于指定一个异常,当产生异常时,事务回滚,当产生其他异常时,事务不回滚。没有默认值,表示任何异常都回滚。
            no-rollback-for:用于指定一个异常,当产生该异常,事务不回滚,产生其他异常时事务回滚。没有默认值,表示任何异常都回滚。
         -->
        <tx:attributes>
            <tx:method name="*" propagation="REQUIRED" read-only="false"/>
            <tx:method name="find*" propagation="SUPPORTS" read-only="true"></tx:method>
        </tx:attributes>
    </tx:advice>
    
    <!--配置AOP-->
    <aop:config>
        <!--配置切入点表达式-->
        <aop:pointcut id="pt" expression="execution(* com.fjut.service.impl.*.*(..))"></aop:pointcut>
        <!--建立事务通知和切入点表达式的对应关系-->
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pt"></aop:advisor>
    </aop:config>
</beans>

3.业务层代码:

package com.fjut.service.impl;

import com.fjut.dao.IAccountDao;
import com.fjut.domain.Account;
import com.fjut.service.IAccountService;

/**
 * 账户的业务层实现类
 *
 * 事务控制应该都是在业务层
 */
public class AccountServiceImpl implements IAccountService{

    private IAccountDao accountDao;

    public void setAccountDao(IAccountDao accountDao) {
        this.accountDao = accountDao;
    }

    @Override
    public Account findAccountById(Integer accountId) {
        return accountDao.findAccountById(accountId);

    }

    @Override
    public void transfer(String sourceName, String targetName, Float money) {
        System.out.println("transfer....");
            //2.1根据名称查询转出账户
            Account source = accountDao.findAccountByName(sourceName);
            //2.2根据名称查询转入账户
            Account target = accountDao.findAccountByName(targetName);
            //2.3转出账户减钱
            source.setMoney(source.getMoney()-money);
            //2.4转入账户加钱
            target.setMoney(target.getMoney()+money);
            //2.5更新转出账户
            accountDao.updateAccount(source);
//            int i=1/0;
            //2.6更新转入账户
            accountDao.updateAccount(target);
    }
}

4.持久层代码:(重点代码:extends JdbcDaoSupport和super.getJdbcTemplate())

package com.fjut.dao.impl;

import com.fjut.dao.IAccountDao;
import com.fjut.domain.Account;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.support.JdbcDaoSupport;

import java.util.List;

public class AccountDaoImpl extends JdbcDaoSupport implements IAccountDao {

    @Override
    public Account findAccountById(Integer accountId) {
        List<Account> accounts = super.getJdbcTemplate().query("select * from account where id = ?",new BeanPropertyRowMapper<Account>(Account.class),accountId);
        return accounts.isEmpty()?null:accounts.get(0);
    }

    @Override
    public Account findAccountByName(String accountName) {
        List<Account> accounts = super.getJdbcTemplate().query("select * from account where name = ?",new BeanPropertyRowMapper<Account>(Account.class),accountName);
        if(accounts.isEmpty()){
            return null;
        }
        if(accounts.size()>1){
            throw new RuntimeException("结果集不唯一");
        }
        return accounts.get(0);
    }

    @Override
    public void updateAccount(Account account) {
        super.getJdbcTemplate().update("update account set name=?,money=? where id=?",account.getName(),account.getMoney(),account.getId());
    }

}

2.spring事务控制——基于注解

需要注意:extends JdbcDaoSupport和super.getJdbcTemplate()来实现的方式不可用了。然后需要配置注入JdbcTemplate。

配置bean.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/tx
        https://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd">

    <!--声明要扫描的包-->
    <context:component-scan base-package="com.fjut"></context:component-scan>

    <!--配置JdbcTemplate-->
    <bean id="JdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 配置数据源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/springmysql"></property>
        <property name="username" value="root"></property>
        <property name="password" value="root"></property>
    </bean>

    <!--spring中基于XML的声明式事务控制配置
        1.配置事务管理器
        2.开启spring对注解事务的支持
        3.在需要使用事务支持的地方(例:此练习中的转账操作实现的service中)使用@Transactional注解
    -->
    <!--配置事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--开启spring对注解事务的支持-->
    <tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven>

</beans>

业务层代码如下:

package com.fjut.service.impl;

import com.fjut.dao.IAccountDao;
import com.fjut.domain.Account;
import com.fjut.service.IAccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

/**
 * 账户的业务层实现类
 *
 * 事务控制应该都是在业务层
 */
@Service("accountService")
@Transactional(propagation = Propagation.SUPPORTS,readOnly = true)//只读事务
public class AccountServiceImpl implements IAccountService{

    @Autowired
    private IAccountDao accountDao;

    public void setAccountDao(IAccountDao accountDao) {
        this.accountDao = accountDao;
    }

    @Override
    public Account findAccountById(Integer accountId) {
        return accountDao.findAccountById(accountId);

    }

    @Transactional(propagation = Propagation.REQUIRED,readOnly = false)//读写事务
    @Override
    public void transfer(String sourceName, String targetName, Float money) {
        System.out.println("transfer....");
            //2.1根据名称查询转出账户
            Account source = accountDao.findAccountByName(sourceName);
            //2.2根据名称查询转入账户
            Account target = accountDao.findAccountByName(targetName);
            //2.3转出账户减钱
            source.setMoney(source.getMoney()-money);
            //2.4转入账户加钱
            target.setMoney(target.getMoney()+money);
            //2.5更新转出账户
            accountDao.updateAccount(source);

//            int i=1/0;

            //2.6更新转入账户
            accountDao.updateAccount(target);
    }
}

持久层代码如下:

package com.fjut.dao.impl;

import com.fjut.dao.IAccountDao;
import com.fjut.domain.Account;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import org.springframework.stereotype.Repository;

import java.util.List;

@Repository("accountDao")
public class AccountDaoImpl implements IAccountDao {

    @Autowired
    private JdbcTemplate template;

    @Override
    public Account findAccountById(Integer accountId) {
        List<Account> accounts = template.query("select * from account where id = ?",new BeanPropertyRowMapper<Account>(Account.class),accountId);
        return accounts.isEmpty()?null:accounts.get(0);
    }

    @Override
    public Account findAccountByName(String accountName) {
        List<Account> accounts = template.query("select * from account where name = ?",new BeanPropertyRowMapper<Account>(Account.class),accountName);
        if(accounts.isEmpty()){
            return null;
        }
        if(accounts.size()>1){
            throw new RuntimeException("结果集不唯一");
        }
        return accounts.get(0);
    }

    @Override
    public void updateAccount(Account account) {
        template.update("update account set name=?,money=? where id=?",account.getName(),account.getMoney(),account.getId());
    }

}

缺点:若在一个service中有多个事务,且类型不一样的话。需要在使用事务支持的地方(例:此练习中的转账操作实现的service中)使用多次@Transactional注解。


标签:Account,accountDao,springframework,案例,import,springAOP,org,public
来源: https://blog.csdn.net/LUSHIJIE__/article/details/109982578

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