简单模拟Spring容器（一）

本次模拟非常简单，所以直接上代码！

一、配置文件bean.xml

<?xml version="1.0" encoding="UTF-8"?><beans> <bean id="com.summer.test.Test" class="com.summer.test.Test" name="com.summer.test.Test"></bean></beans>

二、实体类Test

package com.summer.test;public class Test {public void test(){System.out.println("=======test=========");}}

三、模拟Spring容器SpringContext

package com.summer.util;import java.util.HashMap;import java.util.List;import java.util.Map;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.SAXReader;import com.summer.test.Test;/** * 自定义Spring容器 * @author Administrator * */public class SpringContext {/** * key:为bean的属性ID的值 * value:为bean的属性class的值 */public static Map<String, Object> map = new HashMap<String, Object>();/** * 读取配置文件，解析配置文件 */public static void readApplicationContextXml(){try {SAXReader reader = new SAXReader();Document doc = reader.read("bean.xml");Element root = doc.getRootElement();List<Element> beans = root.elements();for (Element bean : beans) {String id = bean.attributeValue("id");String clazz = bean.attributeValue("class");map.put(id, Class.forName(clazz).newInstance());}} catch (DocumentException e) {e.printStackTrace();} catch (ClassNotFoundException e) {e.printStackTrace();} catch (InstantiationException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();}}public static Object getBean(String beanName){readApplicationContextXml();return map.get(beanName);}/** * 测试 * @param args */public static void main(String[] args) {Test test = (Test) SpringContext.getBean("com.summer.test.Test");test.test();}}