首页 技术 正文
技术 2022年11月23日
0 收藏 394 点赞 4,846 浏览 7505 个字

今天我分享一个技术点,利用Spring初始化+线程接管进行程序启动后保持会话状态。

先来一段@test单元测试注解,后台开发的很熟悉,这是测试局部代码用的:

@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(locations = "classpath:applicationContext.xml")

RunWith和ContextConfiguration的源码和功能就不细解释了,不熟悉的可以去翻翻源码。

1:我来一段@Test单元测试操作数据的代码:

@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(locations = "classpath:applicationContext.xml")public class RunTest {    @Autowired    CustomerServices custServer;//services层,注入了dao层    @Test    public void test(){        Customer customer = new Customer();        customer.setCname("余根海");        customer.setCinfo("我是一条鱼!");        customer.setCage(");        custServer.insertTest(customer);    }}

(1) 跑一遍单元测试,INFO日志输出:

::,  INFO DefaultTestContextBootstrapper: - Loaded default TestExecutionListener class names from location [META-INF/spring.factories]: [org.springframework.test.context.web.ServletTestExecutionListener, org.springframework.test.context.support.DirtiesContextBeforeModesTestExecutionListener, org.springframework.test.context.support.DependencyInjectionTestExecutionListener, org.springframework.test.context.support.DirtiesContextTestExecutionListener, org.springframework.test.context.transaction.TransactionalTestExecutionListener, org.springframework.test.context.jdbc.SqlScriptsTestExecutionListener]::,  INFO DefaultTestContextBootstrapper: - Using TestExecutionListeners: [org.springframework.test.context.web.ServletTestExecutionListener@146ba0ac, org.springframework.test.context.support.DirtiesContextBeforeModesTestExecutionListener@4dfa3a9d, org.springframework.test.context.support.DependencyInjectionTestExecutionListener@6eebc39e, org.springframework.test.context.support.DirtiesContextTestExecutionListener@464bee09, org.springframework.test.context.transaction.TransactionalTestExecutionListener@f6c48ac, org.springframework.test.context.jdbc.SqlScriptsTestExecutionListener@13deb50e]::,  INFO XmlBeanDefinitionReader: - Loading XML bean definitions from class path resource [applicationContext.xml]::,  INFO GenericApplicationContext: - Refreshing org.springframework.context.support.GenericApplicationContext@370736d9: startup date [Mon Aug  :: CST ]; root of context hierarchy::,  INFO PropertyPlaceholderConfigurer: - Loading properties file from class path resource [init.properties]::,  INFO MLog: - MLog clients using slf4j logging.::,  INFO C3P0Registry: - Initializing c3p0--December- :: -; debug? ]::,  INFO Version: - HHH000412: Hibernate Core {.Final}::,  INFO Environment: - HHH000206: hibernate.properties not found::,  INFO Environment: - HHH000021: Bytecode provider name : javassist::,  INFO Version: - HCANN000001: Hibernate Commons Annotations {.Final}::,  INFO AbstractPoolBackedDataSource: - Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> , acquireRetryAttempts -> , acquireRetryDelay -> , autoCommitOnClose -> , connectionCustomizerClassName -> , initialPoolSize -> , jdbcUrl -> jdbc:mysql://127.0.0.1:3306/yugh?useUnicode=true&characterEncoding=utf-8, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 30, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 20, maxStatements -> 0, maxStatementsPerConnection -> 0, minPoolSize -> 5, numHelperThreads -> 3, preferredTestQuery -> null, privilegeSpawnedThreads -> false, properties -> {user=******, password=******}, propertyCycle -> 0, statementCacheNumDeferredCloseThreads -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, userOverrides -> {}, usesTraditionalReflectiveProxies -> false ]::,  INFO Dialect: - HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect::,  INFO LobCreatorBuilderImpl: - HHH000423: Disabling contextual LOB creation ] less than::,  INFO SchemaUpdate: - HHH000228: Running hbm2ddl schema update::,  INFO HibernateTransactionManager: - Using DataSource [com.mchange.v2.c3p0.ComboPooledDataSource[ identityToken -> 1bqudj89p1g46yu313x3lsl|41ab013, dataSourceName -> 1bqudj89p1g46yu313x3lsl|41ab013 ]] of Hibernate SessionFactory for HibernateTransactionManagerHibernate: select next_val as id_val from hibernate_sequence for updateHibernate: update hibernate_sequence set next_val= ? where next_val=?Hibernate: insert into customer (cage, cinfo, cname, id) values (?, ?, ?, ?)::,  INFO GenericApplicationContext: - Closing org.springframework.context.support.GenericApplicationContext@370736d9: startup date [Mon Aug  :: CST ]; root of context hierarchy

(2) 可以看到@Test单元测试初始化了一遍Spring和Spring文件里的所有配置,因为要操作数据对象,在大部分后台单元测试中,目的都是数据交互。

@Test总结:通过@Test单元测试可以得到初始化Spring以及加载完毕已经配置到Spring文件中所有正确的配置参数,虽然它运行是短暂的。

请忽略上面的Hibernate,虽然上面测试是hibernate作为持久层,但本文所有知识点都是Spring,包括用Spring的数据控制替换其他持久层。

2:得到了初始化的目的,下面就得用线程接管初始化后的操作,几个关键点:(1)初始化spring文件  (2)事务用谁,怎么用,能否成功?(3)线程何时去接管?

静态对象是保持对象唯一,保持初始化的唯一,因为用@TEST单元测试时候,注解RunWith是把测试类和方法名都反射了,已经得到了真实的功能类入口,而我们自己初始化Spring启动程序不用@TEST注解就要定义全局静态对象。

(1):初始化Spring文件,文件加载方式是我常用的:

public static final ApplicationContext CONTEXT = new ClassPathXmlApplicationContext("applicationContext.xml");

(2):事务采用Spring的:dataSource是数据库的bean

<bean id="transactionManager"        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">        <property name="dataSource">            <ref bean="dataSource" />        </property>    </bean>

写下获取事务的静态对象:

static final PlatformTransactionManager MANAGER = (PlatformTransactionManager)CONTEXT.getBean("transactionManager");

(3):数据控制对象jdbctemplate,前身jdbcAccessor,源码用的基于sql的DataSource:

public static final JdbcTemplate JDBC_TEMPLATE = (JdbcTemplate)CONTEXT.getBean("jdbcTemplate");
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">        <property name="dataSource">            <ref bean="dataSource" />        </property>    </bean>

(4) 到这里的配置菜单有:初始化Spring文件 + 事务 + 数据控制对象,虽然全部依赖Spring,但已经是一个很优秀的纯后台项目架构了,虽然在持久层没有hibernate那么强大各种操作方式。

最后来一段Spring初始化日志:

09:43:35,326  INFO ClassPathXmlApplicationContext:578 - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@7ce6a65d: startup date [Tue Aug 08 09:43:35 CST 2017]; root of context hierarchy09:43:35,368  INFO XmlBeanDefinitionReader:317 - Loading XML bean definitions from class path resource [applicationContext.xml]09:44:21,994  INFO PropertyPlaceholderConfigurer:172 - Loading properties file from class path resource [init.properties]09:44:24,847  INFO MLog:212 - MLog clients using slf4j logging.09:44:25,007  INFO C3P0Registry:212 - Initializing c3p0-0.9.5.2 [built 08-December-2015 22:06:04 -0800; debug? true; trace: 10]09:44:33,517  INFO AbstractPoolBackedDataSource:212 - Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 5, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 30000, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, contextClassLoaderSource -> caller, dataSourceName -> 1bqudj89p1h4zfam1rricvn|62e8f862, debugUnreturnedConnectionStackTraces -> false, description -> null, driverClass -> com.mysql.jdbc.Driver, extensions -> {}, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, forceSynchronousCheckins -> false, forceUseNamedDriverClass -> false, identityToken -> 1bqudj89p1h4zfam1rricvn|62e8f862, idleConnectionTestPeriod -> 30, initialPoolSize -> 5, jdbcUrl -> jdbc:mysql://127.0.0.1:3306/yugh?useUnicode=true&characterEncoding=utf-8, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 30, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 20, maxStatements -> 0, maxStatementsPerConnection -> 0, minPoolSize -> 5, numHelperThreads -> 3, preferredTestQuery -> null, privilegeSpawnedThreads -> false, properties -> {user=******, password=******}, propertyCycle -> 0, statementCacheNumDeferredCloseThreads -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, userOverrides -> {}, usesTraditionalReflectiveProxies -> false ]

总结构思:(1)利用代码初始加载Spring文件 ——>  (2)主入口定义一个main方法,各种校验运行后,运行 ——> (3)调用静态的初始化代码,开始初始 ——> (4) 初始完毕后调用数据控制 ——> (5)通过一系列后台操作后,线程开始接管 ——> (6)代码控制它保持后台运行会话状态。

微信扫一扫

支付宝扫一扫

本文网址:https://www.zhankr.net/141604.html

相关推荐
python开发_常用的python模块及安装方法
adodb:我们领导推荐的数据库连接组件bsddb3:BerkeleyDB的连接组件Cheetah-1.0:我比较喜欢这个版本的cheeta…
日期:2022-11-24 点赞:875 阅读:5,091
Educational Codeforces Round 11 C. Hard Process 二分
C. Hard Process题目连接:http://www.codeforces.com/contest/660/problem/CDes…
日期:2022-11-24 点赞:806 阅读:3,509
下载Ubuntn 17.04 内核源代码
zengkefu@server1:/usr/src$ uname -aLinux server1 4.10.0-19-generic #21…
日期:2022-11-24 点赞:565 阅读:4,320
可用Active Desktop Calendar V7.86 注册码序列号
可用Active Desktop Calendar V7.86 注册码序列号Name: www.greendown.cn Code: &nb…
日期:2022-11-24 点赞:730 阅读:4,315
Android调用系统相机、自定义相机、处理大图片
Android调用系统相机和自定义相机实例本博文主要是介绍了android上使用相机进行拍照并显示的两种方式,并且由于涉及到要把拍到的照片显…
日期:2022-11-24 点赞:512 阅读:4,920
Struts的使用
一、Struts2的获取  Struts的官方网站为:http://struts.apache.org/  下载完Struts2的jar包,…
日期:2022-11-24 点赞:671 阅读:3,105
发表评论
暂无评论

还没有评论呢,快来抢沙发~

助力内容变现

将您的收入提升到一个新的水平

点击联系客服

在线时间:8:00-16:00

客服电话

400-888-8888

客服邮箱

ceotheme@ceo.com

扫描二维码

关注微信公众号

扫描二维码

手机访问本站