import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.beanutils.ConvertUtils;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.XPath;
import org.dom4j.io.SAXReader;
public class wyzClassPathXMLApplicationContext {
private List<BeanDefinition> beanDefines = new ArrayList<BeanDefinition>();
private Map<String,Object> sigletons =new HashMap<String,Object>();
public wyzClassPathXMLApplicationContext(String filename){
this.readXML(filename);
this.instanceBeans();
this.injectObject();
}
private void injectObject() {
for(BeanDefinition beanDefinition : beanDefines){
Object bean=sigletons.get(beanDefinition.getId());
if(bean!=null){
try{
PropertyDescriptor[] ps = Introspector.getBeanInfo(bean.getClass()).getPropertyDescriptors();
for(PropertyDefinition propertyDefinition: beanDefinition.getPropertys()){
for(PropertyDescriptor properdesc :ps){
if(propertyDefinition.getName().equals(properdesc.getName())){
Method setter=properdesc.getWriteMethod();
if(setter!=null){
Object value =null;
if(propertyDefinition.getRef()!=null && !"".equals(propertyDefinition.getRef().trim())){
value = sigletons.get(propertyDefinition.getRef());
}else{
value = ConvertUtils.convert(propertyDefinition.getValue(),properdesc.getPropertyType());
}
setter.setAccessible(true);
setter.invoke(bean, value);
}
break;
}
}
}
}catch(Exception e){
e.printStackTrace();
}
}
}
}
private void instanceBeans() {
for(BeanDefinition beanDefinition : beanDefines){
try{
if(beanDefinition.getClassName()!= null && !"".equals(beanDefinition.getClassName().trim()))
sigletons.put(beanDefinition.getId(), Class.forName(beanDefinition.getClassName()).newInstance());
}catch(Exception e){
e.printStackTrace();
}
}
}
private void readXML(String filename) {
SAXReader saxReader = new SAXReader();
Document document = null;
try{
URL xmlpath = this.getClass().getClassLoader().getResource(filename);
document = saxReader.read(xmlpath);
Map<String,String> nsMap = new HashMap<String,String>();
nsMap.put("ns","http://www.springframework.org/schema/beans");//加入命名空间
XPath xsub = document.createXPath("//ns:beans/ns:bean");//创建/beans/bean的查询路径
xsub.setNamespaceURIs(nsMap);//设置命名空间
List<Element> beans = xsub.selectNodes(document);//获取文档中所有bean节点
for(Element element : beans){
String id = element.attributeValue("id");//获取id属性
String clazz = element.attributeValue("class");//获得所有class属性
BeanDefinition beanDefine = new BeanDefinition(id,clazz);
XPath propertysub = element.createXPath("ns:property");
propertysub.setNamespaceURIs(nsMap);
List<Element> propertys = propertysub.selectNodes(element);
for(Element property: propertys){
String propertyname = property.attributeValue("name");
String propertyref=property.attributeValue("ref");
String propertyvalue=property.attributeValue("value");
System.out.println(propertyname+propertyref+ propertyvalue);
PropertyDefinition propertyDefinition = new PropertyDefinition(propertyname,propertyref,propertyvalue);
beanDefine.getPropertys().add(propertyDefinition);
}
beanDefines.add(beanDefine);
}
}catch(Exception e){
e.printStackTrace();
}
}
public Object getBean(String beanName){
return this.sigletons.get(beanName);
}
}
posted on 2009-03-31 16:05
asiawang 阅读(324)
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