本帖最后由 1277690043 于 2019-7-7 10:33 编辑
Spring总结一、IOC1、spring基本坐标<properties>
<spring.version>5.0.5.RELEASE</spring.version>
</properties>
<!--导入spring的context坐标，context依赖core、beans、expression-->
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
</dependencies> 2、核心配置文件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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 将userDao注入到spring容器内，由spring容器管理-->
<bean id="userDao" class="com.itheima.dao.impl.UserDaoImpl"></bean>
</beans>3、使用Spring的API获得Bean实例@Test
public void test1(){
ApplicationContext applicationContext = new
ClassPathXmlApplicationContext("applicationContext.xml");
//UserDao userDao = (UserDao) applicationContext.getBean("userDao");
UserDao userDao = (UserDao) applicationContext.getBean(UserDao.class);
userDao.save();
}4、Bean实例化三种方式1）使用无参构造方法实例化 <bean id="userDao" class="com.itheima.dao.impl.UserDaoImpl"/>2）工厂静态方法实例化 public class StaticFactoryBean {
public static UserDao createUserDao(){
return new UserDaoImpl();
}
}<bean id="userDao" class="com.itheima.factory.StaticFactoryBean"
factory-method="createUserDao" />3）工厂实例方法实例化 public class DynamicFactoryBean {
public UserDao createUserDao(){
return new UserDaoImpl();
}
}<bean id="factoryBean" class="com.itheima.factory.DynamicFactoryBean"/>
<bean id="userDao" factory-bean="factoryBean" factory-method="createUserDao"/>5、Bean的依赖注入(set方法)1）在UserServiceImpl中添加setUserDao方法 public class UserServiceImpl implements UserService {
private UserDao userDao;
public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}
} 2）配置Spring容器调用set方法进行注入 <bean id="userDao" class="com.itheima.dao.impl.UserDaoImpl"/>
<bean id="userService" class="com.itheima.service.impl.UserServiceImpl">
<property name="userDao" ref="userDao"/>
</bean>二、Spring配置数据源1、开发步骤①导入数据源的坐标和数据库驱动坐标 ②创建数据源对象 ③设置数据源的基本连接数据 ④使用数据源获取连接资源和归还连接资源
①导入c3p0或druid和Mysql驱动的坐标 <!-- C3P0连接池 -->
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<!-- Druid连接池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.10</version>
</dependency>
<!-- mysql驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.39</version>
</dependency>②创建数据库连接池 //创建C3P0数据库连接池
@Test
public void testC3P0() throws Exception {
//创建数据源
ComboPooledDataSource dataSource = new ComboPooledDataSource();
//设置数据库连接参数
dataSource.setDriverClass("com.mysql.jdbc.Driver"); dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/test");
dataSource.setUser("root");
dataSource.setPassword("root");
//获得连接对象
Connection connection = dataSource.getConnection();
System.out.println(connection);
}//创建Druid数据库连接池
@Test
public void testDruid() throws Exception {
//创建数据源
DruidDataSource dataSource = new DruidDataSource();
//设置数据库连接参数
dataSource.setDriverClassName("com.mysql.jdbc.Driver");
dataSource.setUrl("jdbc:mysql://localhost:3306/test");
dataSource.setUsername("root");
dataSource.setPassword("root");
//获得连接对象
Connection connection = dataSource.getConnection();
System.out.println(connection);
}③提取jdbc.properties配置文件 jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test
jdbc.username=root
jdbc.password=root④读取jdbc.properties配置文件创建连接池 @Test
public void testC3P0ByProperties() throws Exception {
//加载类路径下的jdbc.properties
ResourceBundle rb = ResourceBundle.getBundle("jdbc");
ComboPooledDataSource dataSource = new ComboPooledDataSource();
dataSource.setDriverClass(rb.getString("jdbc.driver"));
dataSource.setJdbcUrl(rb.getString("jdbc.url"));
dataSource.setUser(rb.getString("jdbc.username"));
dataSource.setPassword(rb.getString("jdbc.password"));
Connection connection = dataSource.getConnection();
System.out.println(connection);
}2、Spring配置数据源<!--spring容器加载jdbc.properties文件-->
<context:property-placeholder location="jdbc.properties"/>
<!--spring配置数据源-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driver}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean> | 
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