package com.hang.spring6.bean;

public class HelloWorld {

    public HelloWorld() {
        System.out.println("无参数构造方法执行");
    }

    public void sayHello(){
        System.out.println("helloworld");
    }
}

package com.hang.spring6.bean;

import org.junit.jupiter.api.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class HelloWorldTest {

    private Logger logger = LoggerFactory.getLogger(HelloWorldTest.class);

    @Test
    public void testHelloWorld(){
        
    }
}

@Test
public void testHelloWorld1(){
	ApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml");
    HelloWorld bean = ac.getBean(HelloWorld.class);
    bean.sayHello();
}

@Test
public void testHelloWorld2(){
	ApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml");
    HelloWorld bean = ac.getBean("helloworld", HelloWorld.class);
    bean.sayHello();
}

package com.hang.spring6.bean;
@Data
@NoConstructor
@AllConstructor
public class Student {

    private Integer id;
    private String name;
    private Integer age;
    private String sex;
}

@Test
public void testDIBySet(){
    ApplicationContext ac = new ClassPathXmlApplicationContext("spring-di.xml");
    Student studentOne = ac.getBean("studentOne", Student.class);
    System.out.println(studentOne);
}

@Test
public void testDIByConstructor(){
    ApplicationContext ac = new ClassPathXmlApplicationContext("spring-di.xml");
    Student studentOne = ac.getBean("studentTwo", Student.class);
    System.out.println(studentOne);
}

@Data
@NoConstructor
@AllConstructor
public class Clazz {

    private Integer clazzId;
    private String clazzName;
}

private String[] hobbies;

public String[] getHobbies() {
    return hobbies;
}

public void setHobbies(String[] hobbies) {
    this.hobbies = hobbies;
}

private List<Student> students;

public List<Student> getStudents() {
    return students;
}

public void setStudents(List<Student> students) {
    this.students = students;
}

package com.hang.spring6.bean;

@Data
@NoConstructor
@AllConstructor
public class Teacher {

    private Integer teacherId;
    private String teacherName;

}

private Map<String, Teacher> teacherMap;

public Map<String, Teacher> getTeacherMap() {
    return teacherMap;
}

public void setTeacherMap(Map<String, Teacher> teacherMap) {
    this.teacherMap = teacherMap;
}

@Test
public void testDataSource() throws SQLException {
    ApplicationContext ac = new ClassPathXmlApplicationContext("spring-datasource.xml");
    DataSource dataSource = ac.getBean(DataSource.class);
    Connection connection = dataSource.getConnection();
    System.out.println(connection);
}

package com.hang.spring6.bean;
public class User {

    private Integer id;

    private String username;

    private String password;

    private Integer age;

    public User() {
    }

    public User(Integer id, String username, String password, Integer age) {
        this.id = id;
        this.username = username;
        this.password = password;
        this.age = age;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '/'' +
                ", password='" + password + '/'' +
                ", age=" + age +
                '}';
    }
}

@Test
public void testBeanScope(){
    ApplicationContext ac = new ClassPathXmlApplicationContext("spring-scope.xml");
    User user1 = ac.getBean(User.class);
    User user2 = ac.getBean(User.class);
    System.out.println(user1==user2);
}

public class User {

    private Integer id;

    private String username;

    private String password;

    private Integer age;

    public User() {
        System.out.println("生命周期：1、创建对象");
    }

    public User(Integer id, String username, String password, Integer age) {
        this.id = id;
        this.username = username;
        this.password = password;
        this.age = age;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        System.out.println("生命周期：2、依赖注入");
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public void initMethod(){
        System.out.println("生命周期：3、初始化");
    }

    public void destroyMethod(){
        System.out.println("生命周期：5、销毁");
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '/'' +
                ", password='" + password + '/'' +
                ", age=" + age +
                '}';
    }
}

@Test
public void testLife(){
    ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("spring-lifecycle.xml");
    User bean = ac.getBean(User.class);
    System.out.println("生命周期：4、通过IOC容器获取bean并使用");
    ac.close();
}

package com.hang.spring6.process;
    
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;

public class MyBeanProcessor implements BeanPostProcessor {
    
    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("☆☆☆" + beanName + " = " + bean);
        return bean;
    }
    
    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("★★★" + beanName + " = " + bean);
        return bean;
    }
}

/*
 * Copyright 2002-2020 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.beans.factory;

import org.springframework.lang.Nullable;

/**
 * Interface to be implemented by objects used within a {@link BeanFactory} which
 * are themselves factories for individual objects. If a bean implements this
 * interface, it is used as a factory for an object to expose, not directly as a
 * bean instance that will be exposed itself.
 *
 * <p><b>NB: A bean that implements this interface cannot be used as a normal bean.</b>
 * A FactoryBean is defined in a bean style, but the object exposed for bean
 * references ({@link #getObject()}) is always the object that it creates.
 *
 * <p>FactoryBeans can support singletons and prototypes, and can either create
 * objects lazily on demand or eagerly on startup. The {@link SmartFactoryBean}
 * interface allows for exposing more fine-grained behavioral metadata.
 *
 * <p>This interface is heavily used within the framework itself, for example for
 * the AOP {@link org.springframework.aop.framework.ProxyFactoryBean} or the
 * {@link org.springframework.jndi.JndiObjectFactoryBean}. It can be used for
 * custom components as well; however, this is only common for infrastructure code.
 *
 * <p><b>{@code FactoryBean} is a programmatic contract. Implementations are not
 * supposed to rely on annotation-driven injection or other reflective facilities.</b>
 * {@link #getObjectType()} {@link #getObject()} invocations may arrive early in the
 * bootstrap process, even ahead of any post-processor setup. If you need access to
 * other beans, implement {@link BeanFactoryAware} and obtain them programmatically.
 *
 * <p><b>The container is only responsible for managing the lifecycle of the FactoryBean
 * instance, not the lifecycle of the objects created by the FactoryBean.</b> Therefore,
 * a destroy method on an exposed bean object (such as {@link java.io.Closeable#close()}
 * will <i>not</i> be called automatically. Instead, a FactoryBean should implement
 * {@link DisposableBean} and delegate any such close call to the underlying object.
 *
 * <p>Finally, FactoryBean objects participate in the containing BeanFactory's
 * synchronization of bean creation. There is usually no need for internal
 * synchronization other than for purposes of lazy initialization within the
 * FactoryBean itself (or the like).
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @since 08.03.2003
 * @param <T> the bean type
 * @see org.springframework.beans.factory.BeanFactory
 * @see org.springframework.aop.framework.ProxyFactoryBean
 * @see org.springframework.jndi.JndiObjectFactoryBean
 */
public interface FactoryBean<T> {

    /**
     * The name of an attribute that can be
     * {@link org.springframework.core.AttributeAccessor#setAttribute set} on a
     * {@link org.springframework.beans.factory.config.BeanDefinition} so that
     * factory beans can signal their object type when it can't be deduced from
     * the factory bean class.
     * @since 5.2
     */
    String OBJECT_TYPE_ATTRIBUTE = "factoryBeanObjectType";

    /**
     * Return an instance (possibly shared or independent) of the object
     * managed by this factory.
     * <p>As with a {@link BeanFactory}, this allows support for both the
     * Singleton and Prototype design pattern.
     * <p>If this FactoryBean is not fully initialized yet at the time of
     * the call (for example because it is involved in a circular reference),
     * throw a corresponding {@link FactoryBeanNotInitializedException}.
     * <p>As of Spring 2.0, FactoryBeans are allowed to return {@code null}
     * objects. The factory will consider this as normal value to be used; it
     * will not throw a FactoryBeanNotInitializedException in this case anymore.
     * FactoryBean implementations are encouraged to throw
     * FactoryBeanNotInitializedException themselves now, as appropriate.
     * @return an instance of the bean (can be {@code null})
     * @throws Exception in case of creation errors
     * @see FactoryBeanNotInitializedException
     */
    @Nullable
    T getObject() throws Exception;

    /**
     * Return the type of object that this FactoryBean creates,
     * or {@code null} if not known in advance.
     * <p>This allows one to check for specific types of beans without
     * instantiating objects, for example on autowiring.
     * <p>In the case of implementations that are creating a singleton object,
     * this method should try to avoid singleton creation as far as possible;
     * it should rather estimate the type in advance.
     * For prototypes, returning a meaningful type here is advisable too.
     * <p>This method can be called <i>before</i> this FactoryBean has
     * been fully initialized. It must not rely on state created during
     * initialization; of course, it can still use such state if available.
     * <p><b>NOTE:</b> Autowiring will simply ignore FactoryBeans that return
     * {@code null} here. Therefore it is highly recommended to implement
     * this method properly, using the current state of the FactoryBean.
     * @return the type of object that this FactoryBean creates,
     * or {@code null} if not known at the time of the call
     * @see ListableBeanFactory#getBeansOfType
     */
    @Nullable
    Class<?> getObjectType();

    /**
     * Is the object managed by this factory a singleton? That is,
     * will {@link #getObject()} always return the same object
     * (a reference that can be cached)?
     * <p><b>NOTE:</b> If a FactoryBean indicates to hold a singleton object,
     * the object returned from {@code getObject()} might get cached
     * by the owning BeanFactory. Hence, do not return {@code true}
     * unless the FactoryBean always exposes the same reference.
     * <p>The singleton status of the FactoryBean itself will generally
     * be provided by the owning BeanFactory; usually, it has to be
     * defined as singleton there.
     * <p><b>NOTE:</b> This method returning {@code false} does not
     * necessarily indicate that returned objects are independent instances.
     * An implementation of the extended {@link SmartFactoryBean} interface
     * may explicitly indicate independent instances through its
     * {@link SmartFactoryBean#isPrototype()} method. Plain {@link FactoryBean}
     * implementations which do not implement this extended interface are
     * simply assumed to always return independent instances if the
     * {@code isSingleton()} implementation returns {@code false}.
     * <p>The default implementation returns {@code true}, since a
     * {@code FactoryBean} typically manages a singleton instance.
     * @return whether the exposed object is a singleton
     * @see #getObject()
     * @see SmartFactoryBean#isPrototype()
     */
    default boolean isSingleton() {
        return true;
    }
}

package com.hang.spring6.bean;
public class UserFactoryBean implements FactoryBean<User> {
    @Override
    public User getObject() throws Exception {
        return new User();
    }

    @Override
    public Class<?> getObjectType() {
        return User.class;
    }
}

@Test
public void testUserFactoryBean(){
    //获取IOC容器
    ApplicationContext ac = new ClassPathXmlApplicationContext("spring-factorybean.xml");
    User user = (User) ac.getBean("user");
    System.out.println(user);
}

package com.hang.spring6.autowire.controller
public class UserController {

    private UserService userService;

    public void setUserService(UserService userService) {
        this.userService = userService;
    }

    public void saveUser(){
        userService.saveUser();
    }

}

package com.hang.spring6.autowire.service
public interface UserService {

    void saveUser();

}

package com.hang.spring6.autowire.service.impl
public class UserServiceImpl implements UserService {

    private UserDao userDao;

    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }

    @Override
    public void saveUser() {
        userDao.saveUser();
    }

}

package com.hang.spring6.autowire.dao
public interface UserDao {

    void saveUser();

}

package com.hang.spring6.autowire.dao.impl
public class UserDaoImpl implements UserDao {

    @Override
    public void saveUser() {
        System.out.println("保存成功");
    }

}

@Test
public void testAutoWireByXML(){
    ApplicationContext ac = new ClassPathXmlApplicationContext("autowire-xml.xml");
    UserController userController = ac.getBean(UserController.class);
    userController.saveUser();
}

package org.springframework.beans.factory.annotation;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target({ElementType.CONSTRUCTOR, ElementType.METHOD, ElementType.PARAMETER, ElementType.FIELD, ElementType.ANNOTATION_TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Autowired {
    boolean required() default true;
}

package com.hang.spring6.dao;

public interface UserDao {

    public void print();
}

package com.hang.spring6.dao.impl;

import com.hang.spring6.dao.UserDao;
import org.springframework.stereotype.Repository;

@Repository
public class UserDaoImpl implements UserDao {

    @Override
    public void print() {
        System.out.println("Dao层执行结束");
    }
}

package com.hang.spring6.service;

public interface UserService {

    public void out();
}

package com.hang.spring6.service.impl;

import com.hang.spring6.dao.UserDao;
import com.hang.spring6.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDao userDao;

    @Override
    public void out() {
        userDao.print();
        System.out.println("Service层执行结束");
    }
}

package com.hang.spring6.controller;

import com.hang.spring6.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

@Controller
public class UserController {

    @Autowired
    private UserService userService;

    public void out() {
        userService.out();
        System.out.println("Controller层执行结束。");
    }

}

package com.hang.spring6.bean;

import com.hang.spring6.controller.UserController;
import org.junit.jupiter.api.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class UserTest {

    private Logger logger = LoggerFactory.getLogger(UserTest.class);

    @Test
    public void testAnnotation(){
        ApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml");
        UserController userController = context.getBean("userController", UserController.class);
        userController.out();
        logger.info("执行成功");
    }


}

package com.hang.spring6.service.impl;

import com.hang.spring6.dao.UserDao;
import com.hang.spring6.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

    private UserDao userDao;

    @Autowired
    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }

    @Override
    public void out() {
        userDao.print();
        System.out.println("Service层执行结束");
    }
}

package com.hang.spring6.controller;

import com.hang.spring6.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

@Controller
public class UserController {

    private UserService userService;

    @Autowired
    public void setUserService(UserService userService) {
        this.userService = userService;
    }

    public void out() {
        userService.out();
        System.out.println("Controller层执行结束。");
    }

}

package com.hang.spring6.service.impl;

import com.hang.spring6.dao.UserDao;
import com.hang.spring6.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

    private UserDao userDao;

    @Autowired
    public UserServiceImpl(UserDao userDao) {
        this.userDao = userDao;
    }

    @Override
    public void out() {
        userDao.print();
        System.out.println("Service层执行结束");
    }
}

package com.hang.spring6.controller;

import com.hang.spring6.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

@Controller
public class UserController {

    private UserService userService;

    @Autowired
    public UserController(UserService userService) {
        this.userService = userService;
    }

    public void out() {
        userService.out();
        System.out.println("Controller层执行结束。");
    }

}

package com.hang.spring6.service.impl;

import com.hang.spring6.dao.UserDao;
import com.hang.spring6.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

    private UserDao userDao;

    public UserServiceImpl(@Autowired UserDao userDao) {
        this.userDao = userDao;
    }

    @Override
    public void out() {
        userDao.print();
        System.out.println("Service层执行结束");
    }
}

package com.hang.spring6.controller;

import com.hang.spring6.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

@Controller
public class UserController {

    private UserService userService;

    public UserController(@Autowired UserService userService) {
        this.userService = userService;
    }

    public void out() {
        userService.out();
        System.out.println("Controller层执行结束。");
    }

}

package com.hang.spring6.service.impl;

import com.hang.spring6.dao.UserDao;
import com.hang.spring6.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDao userDao;

    public UserServiceImpl(UserDao userDao) {
        this.userDao = userDao;
    }

    @Override
    public void out() {
        userDao.print();
        System.out.println("Service层执行结束");
    }
}

package com.hang.spring6.dao.impl;

import com.hang.spring6.dao.UserDao;
import org.springframework.stereotype.Repository;

@Repository
public class UserDaoRedisImpl implements UserDao {

    @Override
    public void print() {
        System.out.println("Redis Dao层执行结束");
    }
}