自己写IOC-----第一篇

IOC框架如果多，IOC用的如此多,真的懂的原理吗?

1:根据使用SPRING IOC 的经验  

 

    加载配置文件--------------解析beans.xm--------保存在map中---------反射生成对象；

 

配置文件如下：

 

            <?xml version="1.0" encoding="UTF-8"?>

<beans>
    <bean  id="person" class="com.domain.Person">
    </bean>
    <bean id="loginServce" class="com.servce.LoginServce">
          <prooety name="person" ref="person"></prooety>
    </bean>
</beans>

 

xml操作使用jdom操作；前面有介绍

 

 

package com.jdom.xml;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.JDOMException;
import org.jdom2.input.SAXBuilder;

public class IOCdomXml {
	private static IOCdomXml install = null;

	private IOCdomXml() {

	}

	public synchronized static IOCdomXml getInstall() {
		if (install == null) {
			install = new IOCdomXml();
		}
		return install;
	}

	/**
	 * map<id,Element>保存讀取出來的bean的id和对应的Element节点
	 */
	public Map<String, Element> getBeanElement(String xmlPath) {
		Element root = getRootElement(xmlPath);
		// 得到所有的bean节点
		List<Element> beanlist = root.getChildren("bean");
		Map<String, Element> elmentMap = new HashMap<String, Element>();
		for (Element bean : beanlist) {
			// 得到所有bean节点对象应的id
			String id = bean.getAttributeValue("id");
			elmentMap.put(id, bean);
		}

		return elmentMap;
	}

	/**
	 * map<String,map<String,Element>>保存每个bean中所依赖的对象节点
	 */
	public Map<String, Map<String, Element>> getRefBeanElements(String xmlPath) {
		Map<String, Element> beanMap = getBeanElement(xmlPath);
		Map<String, Map<String, Element>> refMap = new HashMap<String, Map<String, Element>>();
		Map<String, Element> propetyMap = new HashMap<String, Element>();
		for (Map.Entry<String, Element> entry : beanMap.entrySet()) {
			String beanID = entry.getKey();

			Element bean = entry.getValue();
			List<Element> propetylist = bean.getChildren();
			if (propetylist.size() > 0) {
				for (Element propety : propetylist) {
					String propertyID = propety.getAttributeValue("name");
					propetyMap.put(propertyID, propety);
					refMap.put(beanID, propetyMap);
					System.out.println("propety------- " + propety.getName());
				}
			}
		}

		return refMap;
	}

	public Element getRootElement(String xmlPath) {
		SAXBuilder sax = new SAXBuilder();
		Document doc = null;
		try {
			doc = sax.build(IOCdomXml.class.getClassLoader().getResource(
					xmlPath));
		} catch (JDOMException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return doc.getRootElement();
	}
}

 

 

测试xml读取的如下：

 

 

package com.test;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import org.jdom2.Element;
import org.junit.Test;

import com.jdom.xml.IOCdomXml;

public class TestXml {
	@Test
	public void TestgetElementMap() {
		Map<String, Element> beanMap = IOCdomXml.getInstall().getBeanElement(
				"beans.xml");
		System.out.println(beanMap.size());
		for (Map.Entry<String, Element> entry : beanMap.entrySet()) {
			System.out.println("id---" + entry.getKey() + "    class----"
					+ entry.getValue().getAttributeValue("class"));
		}
	}

	@Test
	public void TestGetRefElements() {
		Map<String, Map<String, Element>> refMap = IOCdomXml.getInstall()
				.getRefBeanElements("beans.xml");
		System.out.println(refMap.size());
		Map<String, Element> propertyMap = new HashMap<String, Element>();
		for (Map.Entry<String, Map<String, Element>> entry : refMap.entrySet()) {
			String beanID = entry.getKey();
			propertyMap = entry.getValue();
			System.out.println("property---" + propertyMap.size());
			for (Map.Entry<String, Element> pentry : propertyMap.entrySet()) {
				System.out.println("id---" + pentry.getKey() + "    class----"
						+ pentry.getValue().getAttributeValue("ref"));
			}
		}

	}

}