PropertyDefinition.java
1 package junit.test; 2 3 public class PropertyDefinition { 4 private String name; 5 private String ref; 6 7 public PropertyDefinition(String name, String ref) { 8 this.name = name; 9 this.ref = ref; 10 } 11 12 public String getName() { 13 return name; 14 } 15 public void setName(String name) { 16 this.name = name; 17 } 18 public String getRef() { 19 return ref; 20 } 21 public void setRef(String ref) { 22 this.ref = ref; 23 } 24 25 }
PropertyDefinition
BeanDefinition.java
1 package junit.test; 2 3 import java.util.ArrayList; 4 import java.util.List; 5 6 public class BeanDefinition { 7 private String id; 8 private String className; 9 private List<PropertyDefinition> propertys = new ArrayList<PropertyDefinition>(); 10 11 public BeanDefinition(String id, String className) { 12 this.id = id; 13 this.className = className; 14 } 15 public String getId() { 16 return id; 17 } 18 public void setId(String id) { 19 this.id = id; 20 } 21 public String getClassName() { 22 return className; 23 } 24 public void setClassName(String className) { 25 this.className = className; 26 } 27 public List<PropertyDefinition> getPropertys() { 28 return propertys; 29 } 30 public void setPropertys(List<PropertyDefinition> propertys) { 31 this.propertys = propertys; 32 } 33 34 }
BeanDefinition
ItcastClassPathXMLApplicationContext.java
package junit.test; import java.beans.IntrospectionException; 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.HashSet; import java.util.List; import java.util.Map; import org.dom4j.Document; import org.dom4j.Element; import org.dom4j.XPath; import org.dom4j.io.SAXReader; /** * 传智传客版容器 * */ public class a { private List<BeanDefinition> beanDefines = new ArrayList<BeanDefinition>(); private Map<String, Object> sigletons = new HashMap<String, Object>(); public ItcastClassPathXMLApplicationContext(String filename){ this.readXML(filename); this.instanceBeans(); this.injectObject(); } /** * 为bean对象的属性注入值 */ 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();//获取属性的setter方法 ,private if(setter!=null){ Object value = sigletons.get(propertyDefinition.getRef()); setter.setAccessible(true); setter.invoke(bean, value);//把引用对象注入到属性 } break; } } } } catch (Exception e) { } } } } /** * 完成bean的实例化 */ 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(); } } } /** * 读取xml配置文件 * @param filename */ 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查询路径 xsub.setNamespaceURIs(nsMap);//设置命名空间 List<Element> beans = xsub.selectNodes(document);//获取文档下所有bean节点 for(Element element: beans){ String id = element.attributeValue("id");//获取id属性值 String clazz = element.attributeValue("class"); //获取class属性值 BeanDefinition beanDefine = new BeanDefinition(id, clazz); XPath propertysub = element.createXPath("ns:property"); propertysub.setNamespaceURIs(nsMap);//设置命名空间 List<Element> propertys = propertysub.selectNodes(element); for(Element property : propertys){ String propertyName = property.attributeValue("name"); String propertyref = property.attributeValue("ref"); PropertyDefinition propertyDefinition = new PropertyDefinition(propertyName, propertyref); beanDefine.getPropertys().add(propertyDefinition); } beanDefines.add(beanDefine); } }catch(Exception e){ e.printStackTrace(); } } /** * 获取bean实例 * @param beanName * @return */ public Object getBean(String beanName){ return this.sigletons.get(beanName); } }
ItcastClassPathXMLApplicationContext
时间: 2024-11-05 16:06:22