实战3--项目开始--准备:::资源分类, 日志系统, 写BaseDao
- 项目资源分类:
1. package: base, dao, dao.impl, domain, service, service.impl, util, view.action
2. config里放 applicationContext.xml, hibernate.cfg.xml, jdbc.properties, log4j.properties, struts.xml
applicationContext.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: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/context http://www.springframework.org/schema/context/spring-context-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"> <context:annotation-config /> <!-- 自动扫描与装配bean --> <context:component-scan base-package="cn.itcast.oa" /> <!-- <bean id="testAction" class = "cn.itcast.oa.test.TestAction"></bean> --> <!-- 导入外部的properties文件 --> <context:property-placeholder location="classpath:jdbc.properties"/> <!-- 配置SessionFactory --> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> <!-- 指定 hibernate 配置文件路径 --> <property name="configLocation" value="classpath:hibernate.cfg.xml"></property> <!-- 配置c3p0数据库连接池 --> <property name="dataSource"> <bean class="com.mchange.v2.c3p0.ComboPooledDataSource"> <!-- 数据连接信息 --> <property name="jdbcUrl" value="${jdbcUrl}"></property> <property name="driverClass" value="${driverClass}"></property> <property name="user" value="${user}"></property> <property name="password" value="${password}"></property> <!-- 其他配置 --> <!-- 初始化时获取3个连接, 取值应该在minPoolSize与maxPoolSize之间, default:3 --> <property name="initialPoolSize" value="3"></property> <!-- 连接池中保留的最小连接数, default:3 --> <property name="minPoolSize" value="3"></property> <!-- 连接池中保留的最大连接数, default:15 --> <property name="maxPoolSize" value="5"></property> <!-- 当连接池中的连接耗尽的时候, c3p0一次同时获取的连接数, default:3 --> <property name="acquireIncrement" value="3"></property> <!-- 控制数据源内加载的PreparedStatements数量, 如果maxStatements与maxStatementsPerConnection均为0, 则缓存被关闭, default:0 --> <property name="maxStatements" value="8"></property> <!-- maxStatements与maxStatementsPerConnection定义了连接池内单个连接所拥有的最大缓存statements数, default:0 --> <property name="maxStatementsPerConnection" value="5"></property> <!-- 最大空闲时间, 1800秒内未使用则连接被丢弃,若为0则永不丢弃,default:0 --> <property name="maxIdleTime" value="1800"></property> </bean> </property> </bean> <!-- 配置声明式事务管理 --> <bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory" /> </bean> <tx:annotation-driven transaction-manager="txManager"/> </beans>
hibernate.cfg.xml
<?xml version='1.0' encoding='utf-8'?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <!-- Database connection settings --> <property name="dialect">org.hibernate.dialect.MySQLDialect</property> <!-- <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="connection.url">jdbc:mysql://localhost/hibernate</property> <property name="connection.username">root</property> <property name="connection.password">bjsxt</property> --> <!-- 2. other configuration --> <property name="show_sql">true</property> <property name="hbm2ddl.auto">update</property> <property name="connection.pool_size">1</property> <!--3. mapping --> <mapping resource="cn/itcast/oa/domain/User.hbm.xml" /> </session-factory> </hibernate-configuration>
jdbc.properties
jdbcUrl=jdbc:mysql://localhost/itcastoa0720 driverClass=com.mysql.jdbc.Driver user=root password=********
log4j.properties
### direct log messages to stdout ### log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c:%L - %m%n ### direct messages to file hibernate.log ### #log4j.appender.file=org.apache.log4j.FileAppender #log4j.appender.file.File=hibernate.log #log4j.appender.file.layout=org.apache.log4j.PatternLayout #log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n ### set log levels - for more verbose logging change 'info' to 'debug' ### log4j.rootLogger=error, stdout #log4j.logger.org.hibernate=info #log4j.logger.org.hibernate=debug #log4j.logger.cn.itcast.oa=debug ### log schema export/update ### #log4j.logger.org.hibernate.tool.hbm2ddl=debug
struts.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"> <struts> <!-- 配置为开发模式 --> <constant name="struts.devMode" value="true" /> <!-- 配置扩展名为action --> <constant name="struts.action.extension" value="action" /> <!--把主题配置为simple, --> <constant name="struts.ui.theme" value="simple" /> <package name="default" namespace="/" extends="struts-default"> <!-- 配置 测试用的action, 还没有和spring整合, class属性写全 名--> <!-- 当struts2余spring整合后,class属性可以写bean的名称 --> <!--<action name="test" class="cn.itcast.oa.test.TestAction"> --> <action name="test" class="testAction"> <result name="success">/test.jsp</result> </action> <!-- 岗位管理 --> <action name="*_*" class="{1}Action" method="{2}"> <result name="list">/WEB-INF/jsp/{1}Action/list.jsp</result> <result name="saveUI">/WEB-INF/jsp/{1}Action/saveUI.jsp</result> <result name="toList" type="redirectAction">{1}_list</result> </action> </package> </struts>
3. test也是一个source folder, 放测试文件 SpringTest.java:
package cn.itcast.oa.test; import org.hibernate.SessionFactory; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class SpringTest { private ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml"); @Test public void testBean() throws Exception { TestAction testAction = (TestAction) ac.getBean("testAction"); System.out.println(testAction); } @Test public void testSessionFactory() throws Exception{ SessionFactory sessionFactory = (SessionFactory)ac.getBean("sessionFactory"); System.out.println(sessionFactory); } @Test public void testTransaction() throws Exception { TestService testService = (TestService) ac.getBean("testService"); testService.saveTwoUsers(); } }
- 日志系统:
加入2个jar包:slf4j--log4j12, log4j
log4j.properties
### direct log messages to stdout ### log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c:%L - %m%n ### direct messages to file hibernate.log ### #log4j.appender.file=org.apache.log4j.FileAppender #log4j.appender.file.File=hibernate.log #log4j.appender.file.layout=org.apache.log4j.PatternLayout #log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n ### set log levels - for more verbose logging change 'info' to 'debug' ### log4j.rootLogger=error, stdout #log4j.logger.org.hibernate=info #log4j.logger.org.hibernate=debug #log4j.logger.cn.itcast.oa=debug ### log schema export/update ### #log4j.logger.org.hibernate.tool.hbm2ddl=debug
LogTest.java:
package cn.itcast.oa.test; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class LogTest { //private ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml"); private Log log = LogFactory.getLog(this.getClass()); @Test public void test() throws Exception { log.debug("this is debug info"); log.info("this is info info"); log.warn("this is warn info"); log.error("this is error info"); log.fatal("this is fatal info"); } }
- 写BaseDao
1. 首先存在Role.java, 然后创建接口BaseDao.java:
package cn.itcast.oa.base; import java.util.List; public interface BaseDao<T> { void save(T entity); void delete(Long id); void update(T entity); T getById(Long id); List<T> getByIds(Long[] ids); List<T> findAll(); }
2. 写RoleDao接口:
package cn.itcast.oa.dao; import cn.itcast.oa.base.BaseDao; import cn.itcast.oa.domain.Role; public interface RoleDao extends BaseDao<Role>{ }
3. 写BaseDao的实现类:BaseDaoImpl.java
package cn.itcast.oa.base; import java.lang.reflect.ParameterizedType; import java.util.List; import javax.annotation.Resource; import org.hibernate.Session; import org.hibernate.SessionFactory; @SuppressWarnings("unchecked") public class BaseDaoImpl<T> implements BaseDao<T> { @Resource private SessionFactory sessionFactory; private Class<T> clazz = null; public BaseDaoImpl(){ //使用反射技术得到T的真实类型 ParameterizedType pt = (ParameterizedType)this.getClass().getGenericSuperclass();//获取当前new的对象的泛型的父类类型 this.clazz = (Class<T>)pt.getActualTypeArguments()[0]; System.out.println("clazz===>"+clazz.getName()); System.out.println("clazz===>"+clazz.getSimpleName()); } protected Session getSession() { return sessionFactory.getCurrentSession(); } public void save(T entity) { getSession().save(entity); } public void update(T entity) { getSession().update(entity); } public void delete(Long id) { Object obj = getById(id); if (obj != null) { getSession().delete(obj); } } public T getById(Long id) { return (T) getSession().get(clazz, id); } public List<T> getByIds(Long[] ids) { return getSession().createQuery(// "FROM " + clazz.getSimpleName()+"WHERE id IN(:ids)")// .setParameterList("ids",ids). list(); } public List<T> findAll() { return getSession().createQuery(// "FROM " + clazz.getSimpleName()).// list(); } }
4. 写RoleDao的实现类 RoleDaoImpl.java:
package cn.itcast.oa.dao.impl; import org.springframework.stereotype.Repository; import cn.itcast.oa.base.BaseDaoImpl; import cn.itcast.oa.dao.RoleDao; import cn.itcast.oa.domain.Role; @Repository public class RoleDaoImpl extends BaseDaoImpl<Role> implements RoleDao{ }
5. 写个测试文件:BaseDaoTest.java:
package cn.itcast.oa.test; import org.junit.Test; import cn.itcast.oa.dao.RoleDao; import cn.itcast.oa.dao.UserDao; import cn.itcast.oa.dao.impl.RoleDaoImpl; import cn.itcast.oa.dao.impl.UserDaoImpl; public class BaseDaoTest { @Test public void testSave() { UserDao userDao = new UserDaoImpl(); RoleDao roleDao = new RoleDaoImpl(); } }
结果:
clazz===>cn.itcast.oa.domain.User clazz===>User clazz===>cn.itcast.oa.domain.Role clazz===>Role