springAOP案例
作者:互联网
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