Spring JDBC将DataSource注入另一个bean

Question

I am new to Spring. While learning it, I decided to play around with JDBC.

Cutting short, I have two classes:

Class 1 contains this:

import javax.sql.DataSource;
public class class1 extends class2 {

    private Connection con;
    private DataSource dataSource;

    public void setDataSource(DataSource ds) {
        dataSource = ds;
    }

public void getConnection(){
login(username,password,url);
con = dataSource.getConnection();
}
}

Class 1 is basically where I ask user to enter the username/password/ur and then call the method from class2 passing these details. I want to inject value of DataSource from this class to class1. So far this is my code for class2:

import javax.sql.DataSource;

import org.springframework.beans.factory.config.RuntimeBeanReference;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.context.support.GenericApplicationContext;
import org.springframework.jdbc.datasource.DriverManagerDataSource;

abstract class class2{
public void login(String username, String password, String url){
GenericApplicationContext context = new GenericApplicationContext();
            DefaultListableBeanFactory factory = (DefaultListableBeanFactory) context.getBeanFactory();

            BeanDefinitionBuilder bean1 = BeanDefinitionBuilder
                    .rootBeanDefinition("org.springframework.jdbc.datasource.DriverManagerDataSource");
            bean1.addPropertyReference("driverClassName", "dataSource");
            bean1.addPropertyValue("driverClassName", "com.mysql.jdbc.Driver");
            bean1.addPropertyReference("url", "dataSource");
            bean1.addPropertyValue("url", "url");
            bean1.addPropertyReference("username", "dataSource");
            bean1.addPropertyValue("username", username);
            bean1.addPropertyReference("password", "dataSource");
            bean1.addPropertyValue("password", password);
            bean1.registerBeanDefinition("dataSource", bean1.getBeanDefinition());

            BeanDefinitionBuilder bean2 = BeanDefinitionBuilder.rootBeanDefinition("class2");
            bean2.addPropertyValue("dataSource", "getCon");
            context.refresh();
            bean2.addPropertyValue("dataSource", new RuntimeBeanReference("dataSource"));

            factory.registerBeanDefinition("getCon", bean2.getBeanDefinition());

}
}

However, when I try to execute the method getConnection() from class1, it gives NPE. Can anyone tell me correct way to do this?

Also, I want to do this task programmically (not by using xml).

Answer 1

If you want to do it in Spring then you need to declare a bean definition in application context xml for creating data source and inject to you class.

Alternatively, you can create data source using spring jdbc. Check out this link:

http://examples.javacodegeeks.com/enterprise-java/spring/jdbc/create-data-source-for-jdbctemplate/