简易版Spring Ioc，springioc,简易版Spring Io

简易版Spring Ioc，springioc,简易版Spring Io

简易版Spring Ioc

简易版Spring Ioc

package com.ioc.service;import java.io.IOException;import java.io.InputStream;import java.util.HashMap;import java.util.Map;import java.util.Properties;/** * @author lei 2011-8-22 *  * 简单实现了一下Spring的IOC，理解IOC原理，多使用面向接口编程 *  */public class BeanFactory {    private Map<String, String> beanDefinitions;    BeanFactory(String source) {        this.register(source);    }    public void register(String source) {        InputStream in = this.getClass().getResourceAsStream(source);        Properties p = new Properties();        try {            p.load(in);            in.close();            beanDefinitions = new HashMap<String, String>();            for (Map.Entry<Object, Object> entry : p.entrySet()) {                beanDefinitions.put(entry.getKey().toString(), entry.getValue().toString());            }        } catch (IOException e) {            e.printStackTrace();        }    }    public Object getBean(String name) {        try {            String value = beanDefinitions.get(name);            return Class.forName(value).newInstance();        } catch (InstantiationException e) {            e.printStackTrace();        } catch (IllegalAccessException e) {            e.printStackTrace();        } catch (ClassNotFoundException e) {            e.printStackTrace();        }        return null;    }    public static void main(String[] args) {        BeanFactory factory = new BeanFactory("hello.properties");        MessageWrite write = (MessageWrite) factory.getBean("messageWrite");        MessageSource source = (MessageSource) factory.getBean("messageSource");        write.write(source.getMessage());    }}interface MessageSource {    public String getMessage();}/** * message * @author lei * 2011-8-22 */class SimpleMessageSource implements MessageSource {    @Override    public String getMessage() {        return "hello world";    }}/** * 输出Service * @author lei * 2011-8-22 */interface MessageWrite {    public void write(String str);}class SimpleMessageWrite implements MessageWrite {    public void write(String str) {        System.out.println(str);    }}/** * 附上hello.properties * /messageWrite=com.ioc.service.SimpleMessageWrite * /messageSource=com.ioc.service.SimpleMessageSource *  */