• spring aop


    一,spring实现aop

    1,基于注解

    <aop:aspectj-autoproxy />

    xmlns:aop="http://www.springframework.org/schema/aop"
    
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd"
    
    //启动对@AspectJ注解的支持
    <aop:aspectj-autoproxy />

    2,基于xml配置

    <aop:config>...

    二,spring与jdbc整合

    //专门用来对@Transactional解析,注解本身是不起作用的

    <tx:annotation-driven transaction-manager="transactionManager"
    proxy-target-class="true" />

    首先引入一些要用的包

    spring框架需要:

    commons-logging.jar
    spring.jar

    注解需要:

    aspectjrt.jar

    aspectjweaver.jar
    cglib-nodep-2.1_3.jar
    common-annotations.jar


    jdbc数据库,连接池需要:
    commons-dbcp-1.2.1.jar
    commons-pool-1.6.jar
    mysql-connector-java-5.1.29-bin.jar

    一,注解配置事务

    1,在beans.xml中

    
    

    <beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"  
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-2.5.xsd">

    属性名是固定的,如driverClassName

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
                <property name="driverClassName" value="org.gjt.mm.mysql.Driver" />
                <property name="url" value="jdbc:mysql://localhost:3306/test" />            
                <property name="username" value="root" />
                <property name="password" value="root" />
                连接池启动时的初始值 
                <property name="initialSize" value="1"/>
                空闲时,经过高峰时间后,连接池慢慢释放空闲连接,一直减少到maxidle,就停止释放 
                <property name="maxIdle" value="2" />
                最小空闲数,当空闲的连接数小于阈值时,连接池就会预申请一些连接,避免高峰期来不及申请 
                <property name="minIdle" value="1" />
                连接池的最大数 
                <property name="maxActive" value="10" />            
            </bean>
            <!--配置事务管理器  -->
             <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
                 <property name="dataSource" ref="dataSource" />
             </bean>
             <bean id="personService" class="com.maple.service.impl.PersonServiceBean">
                 <property name="dataSource" ref="dataSource"></property>
             </bean>
             <!--用于解析@Transactional注解,注解本身无作用  -->
             <tx:annotation-driven transaction-manager="txManager"/>
    </beans>

    2,PersonService是接口,PersonServiceBean实现了接口,Person是实体类,mysql数据库中有对应表Person,数据库名是test

    package com.maple.service.impl;
    
    import java.util.List;
    
    import javax.sql.DataSource;
    
    import org.springframework.jdbc.core.JdbcTemplate;
    import org.springframework.transaction.annotation.Transactional;
    
    import com.maple.bean.Person;
    import com.maple.service.PersonService;
    
    public class PersonServiceBean implements PersonService {
        //private DataSource dataSource;
        private JdbcTemplate jdbcTemplate;
        public void setDataSource(DataSource dataSource) {
            //this.dataSource = dataSource;
            jdbcTemplate=new JdbcTemplate(dataSource);
        }
    
        @Override
        public void save(Person p) {
            // TODO Auto-generated method stub
            jdbcTemplate.update("insert into person (name) values (?)", 
                    new Object[]{p.getName()}, 
                    new int[]{java.sql.Types.VARCHAR});
        }
    
        @Override
        public Person getPerson(Integer id) {
            // TODO Auto-generated method stub
            return (Person) jdbcTemplate.queryForObject("select * from person where id=?",
                    new Object[]{id}, new PersonRowMapper());
        }
    
        @SuppressWarnings("unchecked")
        @Override
        public List<Person> getPersons() {
            // TODO Auto-generated method stub
            return jdbcTemplate.query("select * from person",new PersonRowMapper());
        }
    
        @Override
        public void update(Person p) {
            // TODO Auto-generated method stub
            jdbcTemplate.update("update person set name=? where id=?",
                    new Object[]{p.getName(),p.getId()},
                    new int[]{java.sql.Types.VARCHAR,java.sql.Types.INTEGER});
        }
    
        @Override
        public void delete(Integer id) {
            // TODO Auto-generated method stub
            jdbcTemplate.update("delete from person where id=?",
                    new Object[]{id},new int[]{java.sql.Types.INTEGER});
        }
    
    }

    如果数据库连接池的配置要单独放在属性文件中

    <context:property-placeholder location="classpath:jdbc.properties"/>  //属性占位符,指明属性文件在类路径下
           <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
                <property name="driverClassName" value="${driverClassName}" />
                <property name="url" value="${url}" />            
                <property name="username" value="${username}" />
                <property name="password" value="${password}" />
                <!--连接池启动时的初始值  -->
                <property name="initialSize" value="${initialSize}"/>
                <!--空闲时,经过高峰时间后,连接池慢慢释放空闲连接,一直减少到maxidle,就停止释放  -->
                <property name="maxIdle" value="${maxIdle}" />
                <!--最小空闲数,当空闲的连接数小于阈值时,连接池就会预申请一些连接,避免高峰期来不及申请  -->
                <property name="minIdle" value="${minIdle}" />
                <!--连接池的最大数  -->
                <property name="maxActive" value="${maxActive}" />            
            </bean>  

    jdbc.properties

    driverClassName=org.gjt.mm.mysql.Driver
    url=jdbc:mysql://localhost:3306/test
    username=root
    password=root
    initialSize=1
    maxIdle=2
    minIdle=1
    maxActive=10

    就可以了

     unchecked Exceptin:运行期异常,事务会回滚

    checked Exception:事务不会回滚

    Unchecked Exception.:包括 Error与RuntimeException. 这类异常都是RuntimeException的子类。

    Checked Exception:除了Error与RuntimeException,其他剩下的异常. 这类异常都是Exception的子类 。在编译时在语法上必须处理的异常,因此必须在语法上以try..catch加以处理;

    一,

    1,会抛异常,记录不会删除,即事务会回滚,unchecked Exception

    @Override
        public void delete(Integer id)  {
            // TODO Auto-generated method stub
            jdbcTemplate.update("delete from person where id=?",
                    new Object[]{id},new int[]{java.sql.Types.INTEGER});
            throw new RunTimeException("运行时异常");
        }
    
    //在junit中
    @Test
        public void delete(){
            personService.delete(6);
        }

    2,会抛异常,记录会删除,事务不会回滚,checked Exception

    @Override
        public void delete(Integer id) throws Exception {
            // TODO Auto-generated method stub
            jdbcTemplate.update("delete from person where id=?",
                    new Object[]{id},new int[]{java.sql.Types.INTEGER});
            throw new Exception("运行时异常");
        }
    
    @Test
        public void delete(){
            //Person p=personService.getPerson(1);
            try {
                personService.delete(6);
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

    针对2,默认不回滚,改变他的回滚方式,即使出现checked Exception,也让事务回滚,使得记录不会删除

    @Transactional(rollbackFor=Exception.class)
        @Override
        public void delete(Integer id) throws Exception {
            // TODO Auto-generated method stub
            jdbcTemplate.update("delete from person where id=?",
                    new Object[]{id},new int[]{java.sql.Types.INTEGER});
            throw new Exception("运行时异常");
        }

     针对1,默认会回滚 ,可以让他不回滚

    @Transactional(noRollbackFor=RuntimeException.class)
        @Override
        public void delete(Integer id) throws Exception {
            // TODO Auto-generated method stub
            jdbcTemplate.update("delete from person where id=?",
                    new Object[]{id},new int[]{java.sql.Types.INTEGER});
            throw new RuntimeException("运行时异常");
        }

    二,xml配置事务,spring事务管理

    如果没有纳入到spring的事务管理器中,则是处于各自不同的事务中

    如果在spring的事务管理中,则是一个事务

    要在beans.xml进行配置

    <!--配置事务管理器  -->
             <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
                 <property name="dataSource" ref="dataSource" />
             </bean>
             <bean id="personService" class="com.maple.service.impl.PersonServiceBean">
                 <property name="dataSource" ref="dataSource"/>
             </bean>
             <!--用于解析@Transactional注解,注解本身无作用  -->
             <!-- <tx:annotation-driven transaction-manager="txManager"/> -->
             <aop:config>
                 <aop:pointcut expression="execution(* com.maple.service..*.*(..))" 
                 id="transactionPointcut"/>
                 <aop:advisor advice-ref="txAdvice" pointcut-ref="transactionPointcut"/>
                 
             </aop:config>
             <tx:advice id="txAdvice" transaction-manager="txManager">
                 <tx:attributes>
                     <tx:method name="get*" read-only="true" propagation="NOT_SUPPORTED"/>
                     <tx:method name="*" />
                 </tx:attributes>
             </tx:advice>

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  • 原文地址:https://www.cnblogs.com/qingmaple/p/4082268.html
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