public class BeanDefinition {
private String id; // 对应 spring配置文件中的id
private String className; // 对应 spring配置文件中的class
// 定义 bean中 属性的节点 集合
private List<PropertyDefinition> propertys = new ArrayList<PropertyDefinition>();
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getClassName() {
return className;
}
public void setClassName(String className) {
this.className = className;
}
public List<PropertyDefinition> getPropertys() {
return propertys;
}
public void setPropertys(List<PropertyDefinition> propertys) {
this.propertys = propertys;
}
public BeanDefinition() {
}
public BeanDefinition(String id, String className) {
this.id = id;
this.className = className;
}
}
public class PropertyDefinition {
private String name; // 对应配置 文件中的name
private String ref; // 对应配置 文件中的ref
private String value; // 为基本属性注入值
private List<String> lists; // lists 注入
private Map<String,String> maps;
public List<String> getLists() {
return lists;
}
public void setLists(List<String> lists) {
this.lists = lists;
}
public String getName() {
return name;
}
public void setName(String name) {
this.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;
}
public Map<String, String> getMaps() {
return maps;
}
public void setMaps(Map<String, String> maps) {
this.maps = maps;
}
public PropertyDefinition() {
super();
// TODO Auto-generated constructor stub
}
public PropertyDefinition(String name, String ref) {
super();
this.name = name;
this.ref = ref;
}
public PropertyDefinition(String name, String ref, String value) {
super();
this.name = name;
this.ref = ref;
this.value = value;
}
public PropertyDefinition(String name, String ref, String value,
List<String> lists,Map<String,String> maps) {
super();
this.name = name;
this.ref = ref;
this.value = value;
this.lists = lists;
this.maps = maps;
}
}
public class MySpringClassPathXmlApplicationContext1 {
private List<BeanDefinition> beandefines = new ArrayList<BeanDefinition>();// 从配置文件得到的bean对象
private Map<String, Object> sigletons = new HashMap<String, Object>();
public MySpringClassPathXmlApplicationContext1(String fileName) {
this.readXml(fileName);
/* for (BeanDefinition b : beandefines) {
for (PropertyDefinition p : b.getPropertys()) {
if (p.getLists() != null) {
for (String s : p.getLists()) {
System.out.println("!@!" + s);
}
}
}
}*/
this.instanceBean();// 初始化bean
this.injectObject();// 注入
}
public void readXml(String fileName) {
fileName = Thread.currentThread().getContextClassLoader().getResource(
fileName).getPath().substring(1);
SAXReader reader = new SAXReader();
try {
Document document = reader.read(new File(fileName));// 读取XML文件
Iterator<?> beans = document.getRootElement().elementIterator(
"bean");
while (beans.hasNext()) {
Element element = (Element) beans.next();
String id = element.attributeValue("id");
String clazz = element.attributeValue("class");
BeanDefinition beanDefinition = new BeanDefinition(id, clazz);
Iterator<?> propertyDefinition = element.elementIterator();
while (propertyDefinition.hasNext()) {
List<String> listValues = null;
Map<String,String> mapValues = null;
Element property = (Element) propertyDefinition.next();
Iterator<?> collections = property.elementIterator();
while (collections.hasNext()) {// 得到property所有list这个标签
Element collection = (Element) collections.next();
String collectionType = collection.getName();
if (collectionType.equals("set")
|| collectionType.equals("list")) {
Iterator<?> values = collection.elementIterator();
listValues = new ArrayList<String>();
while (values.hasNext()) {// 得到list所有value这个标签的值得
Element listValue = (Element) values.next();
String valueList = listValue.getText();
listValues.add(valueList);
}
}else if(collectionType.equals("map")){
Iterator<?> values = collection.elementIterator();
mapValues = new HashMap<String,String>();
while (values.hasNext()) {// 得到list所有value这个标签的值得
Element mapValue = (Element) values.next();
String key = mapValue.attributeValue("key");
String value = mapValue.attributeValue("value");
mapValues.put(key, value);
}
}else{
throw new Exception("配置错误，只能set list map");
}
}
String name = property.attributeValue("name");
String value = property.attributeValue("value");
String ref = property.attributeValue("ref");
PropertyDefinition propertyBean = new PropertyDefinition(
name, ref, value, listValues,mapValues);
beanDefinition.getPropertys().add(propertyBean);
}
beandefines.add(beanDefinition);
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void instanceBean() {
for (BeanDefinition beandefine : beandefines) {
if (beandefine.getClassName() != null
&& !beandefine.getClassName().equals("")) {
try {
sigletons.put(beandefine.getId(), Class.forName(
beandefine.getClassName()).newInstance());
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
private void injectObject() {
try {
for (BeanDefinition beanDefinition : beandefines) {
Object bean = sigletons.get(beanDefinition.getId());
if (bean != null) {
// 如果对象不为空 就获取这个对象的 所有属性信息
PropertyDescriptor[] ps = Introspector.getBeanInfo(
bean.getClass()).getPropertyDescriptors();
for (PropertyDefinition propertyDefinition : beanDefinition// 如果没有这个说明只是个bean定义，没有依赖注入的值
.getPropertys()) {
for (PropertyDescriptor pd : ps) {
if (propertyDefinition.getName().equals(
pd.getName())) {// 类里定义的属性和XML定义的属性相同
Method methodSetter = pd.getWriteMethod();
if (methodSetter != null) {
Object value = null;
if (!methodSetter.isAccessible()) {
methodSetter.setAccessible(true);// 如果私有方法则设置成可以访问
}
if (propertyDefinition.getRef() != null) {
value = sigletons
.get(propertyDefinition
.getRef());
}
if (propertyDefinition.getValue() != null) {
value = propertyDefinition.getValue();
}
if (propertyDefinition.getLists() != null) {
value = propertyDefinition.getLists();
}
if (propertyDefinition.getMaps() != null) {
value = propertyDefinition.getMaps();
}
methodSetter.invoke(bean, value);
}
break;
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
public Object getBean(String name) {
return this.sigletons.get(name);
}
}
public class test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
MySpringClassPathXmlApplicationContext1 ctx = new MySpringClassPathXmlApplicationContext1(
"applicationContext.xml");
PersonService personService = (PersonService) ctx
.getBean("personService");
personService.save();
}
}