java模拟spring ioc

1、java模拟spring ioc?xml version= 1.0 eoding= utf-8 ? beans xms= /schema/beans xmlns:xsi= /2001/xmlschema-instance xsi:schemaloion= /schema/beans /schema/beans/spring-beans-2.5.xsd bean = persondao >

2、; bean id= personservice > property name= id value= 24 / property name= name value= zyj / !- property name= persondao ref= persondao / - /bean /beans package junit.test12; import java.util.arraylist; import java.util.list; /* * xml中的 bean/ 的定义 * author adminisator * */ public class beandefinition

3、 private string id; private string clazz; private list propertydefinition propertydefinitions=new arraylist propertydefinition public beandefinition(string id, string clazz) per(); this.id = id; this.clazz = clazz; public string getid() return id; public void id(string id) this.id = id; public strin

4、g getclazz() return clazz; public void setclazz(string clazz) this.clazz = clazz; public list propertydefinition getpropertydefinitions() return propertydefinitions; public void setpropertydefinitions(list propertydefinition propertydefinitions) pertydefinitions = propertydefinitions; nbsp;

5、package junit.test12; public class propertydefinition private string name; private string ref; private string value; public propertydefinition(string name, string ref,string value) super(); = name; this.ref = ref; this.value=value; public string getname() return name; public void setname(s

6、tring name) = name; public string getref() return ref; public void setref(string ref) this.ref = ref; public string getvalue() return value; public void setvalue(string value) this.value = value; package junit.test12; import java.lang.annotation.elementtype; import java.lang.annotation.ret

7、ention; import java.lang.annotation.retentionpolicy; import java.lang.annotation.target; retention(retentionpolicy.runtime) target(elementtype.field,elementtype.method) public interface userdefinresource public string name() default /用法dom4j读取spring配置文件 package junit.test12; import java.beans.intros

8、pectionexception; import java.beans.introspector; import java.beans.propertydescriptor; import java.lang.reflect.field; import java.lang.reflect.invocationtargetexception; import java.lang.reflect.method; import .url; import java.util.arraylist; import java.util.hashmap; import java.util.list; impor

9、t java.util.map; import junit.test12.beandefinition; import mons.beanuti.convertutils; import mons.beanutils.converter; import org.dom4j.document; import org.dom4j.documentexception; import org.dom4j.element; import org.dom4j.xpath; import org.dom4j.io.saxreader; /* * 自定义容器 * author administrator *

10、*/ public class userdefinedclasspathxmlapplicationcontt private list beandefinition beandefinitions=new arraylist beandefinition private map string, object sigletons=new hashmap string, object public userdefinedclasspathxmlapplicationcontext(string name) this.readxml(filename); this.instancebeans();

11、 this.annotationinject(); this.injectobject(); /* * 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); xpath xpath=d

12、ocument.createxpath( /ns:beans/ns:bean /创建beans/bean查询路径。从根路径开头 map string, string nsmap=new hashmap string, string nsmap.put( ns , /schema/beans /加入命名空间 xpath.setnamespaceuris(nsmap);/设置命名空间 list element beans=xpath.selectnodes(document);/猎取文档下全部bean节点 for (element elem

13、ent : beans) string id=element.attributevalue( id string clazz=element.attributevalue( class beandefinition beandefinition=new beandefinition(id, clazz); xpath xpath2=element.createxpath( ns:property /从相对路径开头 xpath2.setnamespaceuris(nsmap); list element propertys=xpath2.selectnodes(element); for (el

14、ement element2 : propertys) string name=element2.attributevalue( name string ref=element2.attributevalue( ref string value=element2.attributevalue( value propertydefinition propertydefinition=new propertydefinition(name, ref,value); beandefinition.getpropertydefinitions().a(propertydefinition); bean

15、definitions.add(beandefinition); catch (documentexception e) / todo auto-generated catch block e.printstacktrace(); /* * 完成bean的实例化 */ private void instancebeans() try for (beandefinition beandefinition : beandefinitions) if (beandefinition.getclazz()!=null ! .equals(beandefinition.getclazz().trim()

16、 sigletons.put(beandefinition.getid(), class.forname(beandefinition.getclazz().newinstance(); catch (classnotfoundexception e) / todo auto-generated catch block e.printstacktrace(); catch (instantiationexception e) / todo auto-generated catch block e.printstacktrace(); catch (illegalaccessexception

17、e) / todo auto-generated catch block e.printstacktrace(); /* * 为bean对象的属性注入值 * throws introspectionexception * throws invocationtargetexception * throws illegalaccessexception * throws illegalargumentexception */ private void injectobject() try for (beandefinition beandefinition : beandefinitions) o

18、bject bean=sigletons.get(beandefinition.getid(); if (bean!=null) propertydescriptor ps=introspector.getbeaninfo(bean.getclass().getpropertydescriptors(); for(propertydefinition propertydefinition:beandefinition.getpropertydefinitions() for (propertydescriptor propertydescriptor : ps) if (propertydef

19、inition.getname().equals(propertydescriptor.getname() method settermethod=propertydescriptor.getwritemethod();/猎取属性的setter办法 if (settermethod!=null) object temp=null; if (propertydefinition.getref()!=null ! .equals(propertydefinition.getref().trim() temp=sigletons.get(propertydefinition.getref(); el

20、se if (propertydefinition.getvalue()!=null ! .equals(propertydefinition.getvalue().trim() temp=convertutils.convert(propertydefinition.getvalue(), propertydescriptor.getpropertytype(); settermethod.setaccessible(true);/防止setter办法为private settermethod.invoke(bean, temp);/把引用对象注入到属性 break; catch (exce

21、ption e) / todo auto-generated catch block e.printstacktrace(); /* * 通过注解实现注入依靠对象 * throws introspectionexception * throws invocationtargetexception * throws illegalaccessexception * throws illegalargumentexception */ private void annotationinject() try for (string beanname : sigletons.keyset() obje

22、ct bean=sigletons.get(beanname); if (bean!=null) propertydescriptor ps=introspector.getbeaninfo(bean.getclass().getpropertydescriptors(); for (propertydescriptor propertydescriptor : ps) method settermethod=propertydescriptor.getwritemethod(); if (settermethod!=null settermethod.isannotationpresent(

23、userdefinedresource.class) userdefinedresource userdefinedresource=settermethod.getannotation(userdefinedresource.class); object temp = null; if(userdefinedr()!=null ! .equals(userdefinedr() /一旦指定了name属性，就只能按名称装配了 temp = sigletons.get(userdefinedr(); else temp = s

24、igletons.get(propertydescriptor.getname(); if(temp=null) for(string key : sigletons.keyset() if(propertydescriptor.getpropertytype().isassignablefrom(sigletons.get(key).getclass() temp = sigletons.get(key); break; settermethod.setaccessible(true); settermethod.invoke(bean, temp);/把引用对象注入到属性 field fi

25、elds = bean.getclass().getdeclaredfields(); for(field field : fields) if(field.isannotationpresent(userdefinedresource.class) userdefinedresource userdefinedresource = field.getannotation(userdefinedresource.class); object temp = null; if(userdefinedr()!=null ! .equals(userdefinedr() temp = sigletons.get(userdefinedr(); else temp = sigletons.get(field.getname(); if(temp=null) for(string key