手寫ioc、看這裡有你想要的~！
阿新 • • 發佈：2019-02-20
public Object getBean(String beanId) throws DocumentException, ClassNotFoundException, InstantiationException, IllegalAccessException, NoSuchFieldException, SecurityException {
//1、讀取xml配置檔案
// 獲取xml解析器
SAXReader saxReader = new SAXReader();
// 獲得document物件
Document read = saxReader.read(this.getClass().getClassLoader().getResourceAsStream(xmlPath));
// 獲得根節點
Element rootElement = read.getRootElement();
System.out.println("根節點的名稱: " +rootElement.getName());
//獲得元素物件
List<Element> elements = rootElement.elements();
Object obj = null;
for (Element sonEle : elements) {
//2、獲取到每個bean配置，獲得class地址
//獲得每個bean配置 獲取class地址
String sonBeanId = sonEle.attributeValue("id");//user1 user2
if(!beanId.equals(sonBeanId)){
continue;
}
String beanClassPath = sonEle.attributeValue("class");//com.wangys.reflect.UserEntity
//3、拿到class地址，進行反射技術例項化物件，使用反射api為私有屬性賦值
Class<?> forName = Class.forName(beanClassPath);//new UserEntity()
obj = forName.newInstance();//new UserEntity()
System.out.println(obj+"!@");
//拿到成員屬性
List<Element> sonSoneleme = sonEle.elements();
for (Element element : sonSoneleme) {
String name = element.attributeValue("name");//王永生
System.out.println(name+"~~");
String value = element.attributeValue("value");//0001
System.out.println(value+"~~");
//使用反射技術為私有屬性賦值
Field declaredField = forName.getDeclaredField(name);//獲得entity欄位 username userid
//執行往私有屬性賦值
System.out.println(declaredField+"!!!");
declaredField.setAccessible(true);
declaredField.set(obj, value);
}
}
return obj;
}
public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, NoSuchFieldException, SecurityException, DocumentException {
ClassPathXmlApplicationContext classPathXmlApplicationContext = new ClassPathXmlApplicationContext("application.xml");
UserEntity user = (UserEntity) classPathXmlApplicationContext.getBean("user1");
System.out.println(user.getUserId() + "---" +user.getUserName());
}
}
//1、讀取xml配置檔案
// 獲取xml解析器
SAXReader saxReader = new SAXReader();
// 獲得document物件
Document read = saxReader.read(this.getClass().getClassLoader().getResourceAsStream(xmlPath));
// 獲得根節點
Element rootElement = read.getRootElement();
System.out.println("根節點的名稱: " +rootElement.getName());
//獲得元素物件
List<Element> elements = rootElement.elements();
Object obj = null;
for (Element sonEle : elements) {
//2、獲取到每個bean配置，獲得class地址
//獲得每個bean配置 獲取class地址
String sonBeanId = sonEle.attributeValue("id");//user1 user2
if(!beanId.equals(sonBeanId)){
continue;
}
String beanClassPath = sonEle.attributeValue("class");//com.wangys.reflect.UserEntity
//3、拿到class地址，進行反射技術例項化物件，使用反射api為私有屬性賦值
Class<?> forName = Class.forName(beanClassPath);//new UserEntity()
obj = forName.newInstance();//new UserEntity()
System.out.println(obj+"!@");
//拿到成員屬性
List<Element> sonSoneleme = sonEle.elements();
for (Element element : sonSoneleme) {
String name = element.attributeValue("name");//王永生
System.out.println(name+"~~");
String value = element.attributeValue("value");//0001
System.out.println(value+"~~");
//使用反射技術為私有屬性賦值
Field declaredField = forName.getDeclaredField(name);//獲得entity欄位 username userid
//執行往私有屬性賦值
System.out.println(declaredField+"!!!");
declaredField.setAccessible(true);
declaredField.set(obj, value);
}
}
return obj;
}
public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, NoSuchFieldException, SecurityException, DocumentException {
ClassPathXmlApplicationContext classPathXmlApplicationContext = new ClassPathXmlApplicationContext("application.xml");
UserEntity user = (UserEntity) classPathXmlApplicationContext.getBean("user1");
System.out.println(user.getUserId() + "---" +user.getUserName());
}
}