spring demo

持久层部分请参考前面hibernate demo一文

services.xml ：

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd "><bean id="daoimpl" class="com.darcy.note.persistance.UserDAOImpl"></bean><bean id="chinese" class="com.darcy.note.spring.Chinese"><property name="name"><value>小明</value></property><property name="age"><value>12</value></property><property name="list"><list><value>aa</value><value>bb</value></list></property><property name="dao"><ref bean="daoimpl" /></property></bean><bean id="american" class="com.darcy.note.spring.American"><constructor-arg index="0"><ref bean="daoimpl" /></constructor-arg><property name="sb"><value>sbbb</value></property></bean></beans>

模拟spring核心的 BeanPool.java ：

package com.darcy.note.spring;import java.io.IOException;import java.io.InputStream;import java.lang.reflect.Field;import java.lang.reflect.Method;import java.util.LinkedList;import java.util.List;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.ParserConfigurationException;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.Node;import org.w3c.dom.NodeList;import org.xml.sax.SAXException;public class BeanPool {private String path;public BeanPool(String path) {this.path = path;}public Object getBean(String beanid) throws Exception {InputStream stream = this.getClass().getResourceAsStream(path);Document document = getDoc(stream);if (document == null) {return null;}return getBean(beanid, document);}private Document getDoc(InputStream stream) {try {return DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(stream);} catch (SAXException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (ParserConfigurationException e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}private Object getBean(String beanid, Document doc) throws Exception {Element root = doc.getDocumentElement();Element bean = getElement(root, "bean", "id", beanid);Object ret = getBean(bean);return ret;}private Object getBean(Element bean) throws Exception {if (bean != null) {String clazz = bean.getAttribute("class");if (clazz != null) {// 仅模拟简单情况，不支持构造器注入参数Object obj = Class.forName(clazz).newInstance();List<Element> properties = getElements(bean, "property");for (Element e : properties) {String name = e.getAttribute("name");if (name == null) {continue;}setValue(obj, name, e);}return obj;}}return null;}private void setValue(Object obj, String name, Element element)throws Exception {String setMethod = getSetMethodName(name);List<Element> valueList = getElements(element, "value");// valueif (!valueList.isEmpty()) {String value = valueList.get(0).getTextContent();Field f = obj.getClass().getDeclaredField(name);// 支持Integer类型和String类型if (f.getType().getName().equals("int")) {obj.getClass().getMethod(setMethod, int.class).invoke(obj, Integer.parseInt(value));} else {obj.getClass().getMethod(setMethod, String.class).invoke(obj, value);}} else {List<Element> listList = getElements(element, "list");// listif (!listList.isEmpty()) {List<Element> values = getElements(listList.get(0), "value");List<String> list = new LinkedList<String>();for (Element value : values) {list.add(value.getTextContent());}obj.getClass().getMethod(setMethod, List.class).invoke(obj, list);} else {// refString beanid = getElements(element, "ref").get(0).getAttribute("bean");Object refObj = getBean(beanid, element.getOwnerDocument());Method[] methods = obj.getClass().getMethods();for (Method method : methods) {if (method.getName().equals(setMethod)) {method.invoke(obj, refObj);break;}}}}}private String getSetMethodName(String name) {return "set" + name.substring(0, 1).toUpperCase() + name.substring(1);}private Element getElement(Element root, String tagName, String attr,String attrValue) {NodeList list = root.getElementsByTagName(tagName);for (int i = 0; i < list.getLength(); i++) {Node node = list.item(i);if (node.getNodeType() == Node.ELEMENT_NODE) {Element e = (Element) node;String value = e.getAttribute(attr);if (value != null && value.equals(attrValue)) {return e;}}}return null;}private List<Element> getElements(Element root, String tagName) {NodeList list = root.getChildNodes();List<Element> elist = new LinkedList<Element>();for (int i = 0; i < list.getLength(); i++) {Node node = list.item(i);if (node.getNodeName().equals(tagName)&& node.getNodeType() == Node.ELEMENT_NODE) {Element e = (Element) node;elist.add(e);}}return elist;}}

接口 Person.java ：

package com.darcy.note.spring;public interface Person {void speak();}

服务实例 Chinese.java ： 

package com.darcy.note.spring;import java.util.List;import com.darcy.note.persistance.User;import com.darcy.note.persistance.UserDAO;public class Chinese implements Person {private String name;private int age;private List<String> list;private UserDAO dao;public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public void speak() {System.out.println("a chinese name " + this.name + ", age " + this.age+ ", list " + list.get(0));User user = new User();user.setName(name);user.setPassword(String.valueOf(age));user.setType(null);dao.save(user);}public List<String> getList() {return list;}public void setList(List<String> list) {this.list = list;}public UserDAO getDao() {return dao;}public void setDao(UserDAO dao) {this.dao = dao;}}

测试类：

package com.darcy.note.spring;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class Test {public static void main(String[] args) throws Exception {// ApplicationContext context = new ClassPathXmlApplicationContext(// "/services.xml");BeanPool context = new BeanPool("/services.xml");Person p = (Person) context.getBean("chinese");p.speak();// p = (Person) context.getBean("american");// p.speak();}}