Spring基本原理模拟(IoC部分)
2024-08-30 12:39:11
package ioc;
import java.io.File;
import java.lang.reflect.Method;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
public class MyXmlApplicationContext implements ApplicationContext {
private Map<String, Object> objectPool = Collections
.synchronizedMap(new HashMap<String, Object>());
private Document doc;
private Element root;
public MyXmlApplicationContext(String filePath) throws Exception {
SAXReader reader = new SAXReader();
doc = reader.read(new File(filePath));
root = doc.getRootElement();
intitPool();
intitProp();
}
@Override
public Object getBean(String name) throws Exception {
Object target = objectPool.get(name);
if (target.getClass() != String.class) {
return target;
} else {
String clazz = (String) target;
return Class.forName(clazz).newInstance();
}
}
private void intitProp() throws Exception {
for (Object obj : root.elements()) {
Element beanEle = (Element) obj;
String beanId = beanEle.attributeValue("id");
String beanScope = beanEle.attributeValue("scope");
if (beanScope == null || beanScope.equals("singleton")) {
Object bean = objectPool.get(beanId);
for (Object prop : beanEle.elements()) {
Element propEle = (Element) prop;
String propName = propEle.attributeValue("name");
String propValue = propEle.attributeValue("value");
String propRef = propEle.attributeValue("ref");
String propNameCamlize = propName.substring(0, 1)
.toUpperCase()
+ propName.substring(1, propName.length());
if (propValue != null && propValue.length() > 0) {
Method setter = bean.getClass().getMethod(
"set" + propNameCamlize, String.class);
setter.invoke(bean, propValue);
}
if (propRef != null && propRef.length() > 0) {
Object target = objectPool.get(propRef);
if (target == null) {
}
Method setter = null;
for (Class<?> superInteface : target.getClass()
.getInterfaces()) {
try {
setter = bean.getClass().getMethod(
"set" + propNameCamlize, superInteface);
break;
} catch (NoSuchMethodException ex) {
continue;
}
}
if (setter == null) {
setter = bean.getClass().getMethod(
"set" + propNameCamlize, target.getClass());
}
setter.invoke(bean, target);
}
}
}
}
}
private void intitPool() throws Exception {
for (Object obj : root.elements()) {
Element beanEle = (Element) obj;
String beanId = beanEle.attributeValue("id");
String beanClass = beanEle.attributeValue("class");
String beanScope = beanEle.attributeValue("scope");
if (beanScope == null || beanScope.equals("singleton")) {
objectPool.put(beanId, Class.forName(beanClass).newInstance());
} else {
objectPool.put(beanId, beanClass);
}
}
}
}
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