Time: 2024-05-14 Tuesday 16:06:01
Author: Jackasher
手写Spring框架
注意使用该框架时,Spring.xml不要上约束
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| package org.myspringframework.core;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.InputStream;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class ClassPathXmlApplication implements ApplicationContext {
private static final Logger logger = LoggerFactory.getLogger(ClassPathXmlApplication.class);
private Map<String, Object> singletonObjects = new HashMap<>();
public ClassPathXmlApplication(String configLocation) throws DocumentException {
SAXReader saxReader = new SAXReader();
InputStream resourceAsStream = ClassLoader.getSystemClassLoader().getResourceAsStream(configLocation);
Document document = saxReader.read(resourceAsStream);
List nodes = document.selectNodes("//bean");
nodes.forEach(node -> {
System.out.println("-------------------------------------------------------------------");
try {
Element element = (Element) node;
String id = element.attributeValue("id");
String aClass = element.attributeValue("class");
logger.info("beanName = " + id);
logger.info("beanClass = " + aClass);
Class<?> aClass1 = Class.forName(aClass);
Constructor<?> declaredConstructor = aClass1.getDeclaredConstructor();
Object bean = declaredConstructor.newInstance();
singletonObjects.put(id, bean);
logger.info(singletonObjects.toString());
} catch (Exception e) {
throw new RuntimeException(e);
}
});
nodes.forEach(node -> {
System.out.println("--------------------------------------------------------------------------------------------------------------------");
try {
Element element = (Element) node;
String id = element.attributeValue("id");
String className = element.attributeValue("class");
Class<?> aClass = Class.forName(className);
List propertynodes = element.selectNodes("properties");
propertynodes.forEach(property ->{
try {
Element propertyElement = (Element) property;
String name = propertyElement.attributeValue("name");
logger.info("属性名:" + name);
String setMethodName = "set" + name.toUpperCase().charAt(0) + name.substring(1);
Field declaredField = aClass.getDeclaredField(name);
logger.info("declaredFileld:" + declaredField);
Class<?> declaredFieldType = declaredField.getType();
logger.info("declaredFileldType:" + declaredFieldType);
logger.info("set赋值方法:" + setMethodName);
Method setMethod = aClass.getDeclaredMethod(setMethodName,declaredFieldType );
logger.info("set方法参数:" + declaredFieldType);
String value = propertyElement.attributeValue("value");
String ref = propertyElement.attributeValue("ref");
Object actualValue = null;
if (value != null) {
String simpleName = declaredField.getType().getSimpleName();
switch(simpleName) {
case "byte":
actualValue = Byte.parseByte(value);
break;
case "short":
actualValue = Short.parseShort(value);
break;
case "int":
actualValue = Integer.parseInt(value);
break;
case "long":
actualValue = Long.parseLong(value);
break;
case "float":
actualValue = Float.parseFloat(value);
break;
case "double":
actualValue = Double.parseDouble(value);
break;
case "boolean":
actualValue = Boolean.parseBoolean(value);
break;
case "char":
if (value.length() == 1) {
actualValue = value.charAt(0);
} else {
actualValue = value.charAt(0);
}
break;
case "Byte":
actualValue = Byte.valueOf(value);
break;
case "Short":
actualValue = Short.valueOf(value);
break;
case "Integer":
actualValue = Integer.valueOf(value);
break;
case "Long":
actualValue = Long.valueOf(value);
break;
case "Float":
actualValue = Float.valueOf(value);
break;
case "Double":
actualValue = Double.valueOf(value);
break;
case "Boolean":
actualValue = Boolean.valueOf(value);
break;
case "Character":
if (value.length() == 1) {
actualValue = value.charAt(0);
}
break;
case "String":
actualValue = value;
break;
default:
throw new IllegalArgumentException("Unsupported data type: " + simpleName);
}
setMethod.invoke(singletonObjects.get(id),actualValue);
}
if (ref != null) {
setMethod.invoke(singletonObjects.get(id),singletonObjects.get(ref));
}
} catch (Exception e) {
throw new RuntimeException(e);
}
});
} catch (Exception e) {
throw new RuntimeException(e);
}
});
}
@Override
public Object getBean(String beanName) {
return singletonObjects.get(beanName);
}
}
|