要約すれば:
を。spring.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<context:annotation-config />
<context:component-scan base-package="org.tutorial.spring" />
</beans>
b. SpringJdbcDemo.java
package org.tutorial.spring;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.tutorial.spring.dao.SpringJdbcDao;
import org.tutorial.spring.model.Circle;
public class SpringJdbcDemo {
public static void main(String[] args) {
AbstractApplicationContext ctx = new ClassPathXmlApplicationContext("spring.xml");
SpringJdbcDao dao = ctx.getBean("springJdbcDao", SpringJdbcDao.class);
ctx.close();
Circle circle = dao.getCircle(1);
System.out.println(circle);
}
}
ctx.close() が dao.getCircle(); の前にあることに注意してください。
c. SpringJdbcDao.java
package org.tutorial.spring.dao;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.springframework.stereotype.Component;
import org.tutorial.spring.model.Circle;
@Component
public class SpringJdbcDao {
public Circle getCircle(int circleId) {
Connection conn = null;
Circle circle = null;
String derbyDriver = "org.apache.derby.jdbc.ClientDriver";
try {
Class.forName(derbyDriver).newInstance();
conn = DriverManager.getConnection("jdbc:derby://localhost:1527/db");
PreparedStatement ps = conn.prepareStatement("select * from circle");
ResultSet rs = ps.executeQuery();
if (rs.next()) {
circle = new Circle(circleId, rs.getString("name"));
}
rs.close();
ps.close();
} catch (Exception e) {
throw new RuntimeException(e.toString());
} finally {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return circle;
}
}
出力:
2013 年 2 月 24 日 9:40:55 PM org.springframework.beans.factory.support.DefaultSingletonBeanRegistry destroySingletons 情報: org.springframework.beans.factory.support.DefaultListableBeanFactory@45e7c8de でシングルトンを破棄しています: Bean を定義しています [org.springframework.context. Annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,springJdbcDao,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; ファクトリ階層のルート
Circle [id=1, name=First Circle]
dao は ctx.close() メソッドの後でも機能します。どんな助けでも大歓迎です。