[Java] try-with-resource 로 리팩토링

기존

public class DataSourceTest {

	public static void main(String[] args) {
		ApplicationContext ac = new AnnotationConfigApplicationContext(ApplicationConfig.class);
		DataSource ds = ac.getBean(DataSource.class);
		Connection conn = null;
		try {
			conn = ds.getConnection();
			if(conn != null)
				System.out.println("Connection Succeed");
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if(conn != null) {
				try {
					conn.close();
				}catch (Exception e) {
					e.printStackTrace();
				}
			}
		}
	}

}

 

리팩토링 후

package kr.or.connect.daoexam.main;

import java.sql.Connection;
import javax.sql.DataSource;

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.*;

import kr.or.connect.daoexam.config.ApplicationConfig;

public class DataSourceTest {

    public static void main(String[] args) {
        ApplicationContext ac = new AnnotationConfigApplicationContext(ApplicationConfig.class);
        DataSource ds = ac.getBean(DataSource.class);

        try (Connection conn = ds.getConnection()) {
            if (conn != null) {
                System.out.println("Connection Succeed");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}