0.2ver

src/main/java/springframework/config/BeanDefinition.java

@@ -0,0 +1,20 @@
+package springframework.config;
+
+/**
+ * @Author:吉口吉
+ * @Date:Created in 18:10 2021/12/5
+ * @Description:
+ */
+public class BeanDefinition {//类信息，封装Class
+    private Class beanClass;
+
+    public BeanDefinition(Class beanClass){
+        this.beanClass=beanClass;
+    }
+    public Class getBeanClass(){
+        return this.beanClass;
+    }
+    public void setBeanClass(Class beanClass){
+        this.beanClass=beanClass;
+    }
+}

src/main/java/springframework/config/SingletonBeanRegistry.java

@@ -0,0 +1,10 @@
+package springframework.config;
+
+/**
+ * @Author:吉口吉
+ * @Date:Created in 18:16 2021/12/5
+ * @Description:
+ */
+public interface SingletonBeanRegistry {//缓存，单例注册表
+    public Object getSingleton(String beanName);
+}

src/main/java/springframework/support/AbstractAutowireCapableBeanFactory.java

@@ -0,0 +1,22 @@
+package springframework.support;
+
+import springframework.config.BeanDefinition;
+
+/**
+ * @Author:吉口吉
+ * @Date:Created in 18:51 2021/12/5
+ * @Description:
+ */
+public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFactory {
+    @Override
+    protected Object createBean(String beanName,BeanDefinition beanDefinition) {
+        Object bean=null;
+        try {
+            bean=beanDefinition.getBeanClass().newInstance();//通过反射创建
+        } catch (InstantiationException | IllegalAccessException e) {
+            System.err.println("实例化Bean失败");
+        }
+        addSingleton(beanName,bean);//加入单例注册表中
+        return bean;
+    }
+}

src/main/java/springframework/support/AbstractBeanFactory.java

@@ -0,0 +1,22 @@
+package springframework.support;
+
+import springframework.BeanFactory;
+import springframework.config.BeanDefinition;
+
+/**
+ * @Author:吉口吉
+ * @Date:Created in 18:44 2021/12/5
+ * @Description:
+ */
+public abstract class AbstractBeanFactory extends DefaultSingletonBeanRegistry implements BeanFactory {
+    @Override
+    public Object getBean(String name){
+        Object bean =getSingleton(name);
+        if(bean!=null) return bean;
+        BeanDefinition beanDefinition=getBeanDefinition(name);//使用抽象方法
+        return createBean(name,beanDefinition);//使用抽象方法
+    }
+
+    protected abstract BeanDefinition getBeanDefinition(String beanName);
+    protected abstract Object createBean(String beanName,BeanDefinition beanDefinition);
+}

src/main/java/springframework/support/BeanDefinitionRegistry.java

@@ -0,0 +1,12 @@
+package springframework.support;
+
+import springframework.config.BeanDefinition;
+
+/**
+ * @Author:吉口吉
+ * @Date:Created in 18:14 2021/12/5
+ * @Description:
+ */
+public interface BeanDefinitionRegistry {//类信息注册表
+    public void registerBeanDefinition(String beanName, BeanDefinition beanDefinition);
+}

src/main/java/springframework/support/DefaultListableBeanFactory.java

@@ -0,0 +1,26 @@
+package springframework.support;
+
+import springframework.config.BeanDefinition;
+
+import java.util.HashMap;
+
+/**
+ * @Author:吉口吉
+ * @Date:Created in 18:58 2021/12/5
+ * @Description:
+ */
+public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFactory implements BeanDefinitionRegistry {
+    private HashMap<String,BeanDefinition> beanDefinitionHashMap=new HashMap<>();
+
+    @Override
+    protected BeanDefinition getBeanDefinition(String beanName) {
+        BeanDefinition beanDefinition=beanDefinitionHashMap.get(beanName);
+        if(beanDefinition==null) System.err.println("beanName为"+beanName+"的bean没有被定义");
+        return beanDefinition;
+    }
+
+    @Override
+    public void registerBeanDefinition(String beanName, BeanDefinition beanDefinition) {
+        beanDefinitionHashMap.put(beanName,beanDefinition);
+    }
+}

src/main/java/springframework/support/DefaultSingletonBeanRegistry.java

@@ -0,0 +1,24 @@
+package springframework.support;
+
+import springframework.config.SingletonBeanRegistry;
+
+import java.util.HashMap;
+
+/**
+ * @Author:吉口吉
+ * @Date:Created in 18:18 2021/12/5
+ * @Description:
+ */
+public class DefaultSingletonBeanRegistry implements SingletonBeanRegistry {
+    private HashMap<String,Object> singletonObjects=new HashMap<>();
+
+    @Override
+    public Object getSingleton(String beanName){
+        return singletonObjects.get(beanName);
+    }
+
+    protected void addSingleton(String beanName,Object singletonObject){
+        singletonObjects.put(beanName,singletonObject);
+    }
+
+}