详解JavaSE实现IoC

BeanInfo bi = Introspector.getBeanInfo(User.class,Object.class);

Stream.of(bi.getPropertyDescriptors()).forEach(pd->{
        Class<?> propertyType=pd.getPropertyType();
        Method writeMethod=pd.getWriteMethod();
        });

writeMethod.invoke(name,value);

public class Address {
    private String name;
    private Integer num;
    // 省略 get / set / toString
}

public class AddressEditor extends PropertyEditorSupport {
    @Override
    public void setAsText(String text) throws IllegalArgumentException {
        String[] tokens = text.split("\\|");
        Address address = new Address();
        address.setName(tokens[0]);
        address.setNum(Integer.valueOf(tokens[1]));
        setValue(address);
    }
}

public class DateEditor extends PropertyEditorSupport {

    static final DateTimeFORMatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd");

    @Override
    public void setAsText(String text) throws IllegalArgumentException {
        LocalDate localDate = LocalDate.parse(text, dtf);
        ZoneId zone = ZoneId.systemDefault();
        Instant instant = localDate.atStartOfDay().atZone(zone).toInstant();
        setValue(Date.from(instant));
    }
}

registerEditor(Address.class,AddressEditor.class);
registerEditor(Date.class,DateEditor.class);

PropertyEditor editor=findEditor(propertyType);
if(editor!=null){
    // 这一步就是为所有属性找到其对应的解析器
    editor.setAsText(parameters.get(pd.getName()));
    try{
        writeMethod.invoke(user,editor.getValue());
    }catch(IllegalAccessException|InvocationTargetException e){
        e.printStackTrace();
    }
}else{
    System.out.println("no editor for:"+pd.getName());
}

public static void main(String[]args)throws Exception{
    Map<String, String> parameters=new HashMap<String, String>(){
        {
            //这里的key要和node里面的属性名一致
            put("name","福尔摩斯");
            put("address","贝克街|221");
            put("birthday","1854-01-06");
        }
    };
    User convert=PropertyEditorSample.convert(parameters);
    System.out.println(convert);
}

User{name='福尔摩斯', birthday=Thu Jan 05 23:54:17 CST 1854, address=Address{name='贝克街, 221 号}}

public interface PayService {
    void pay();
}

public class WeixinpayService implements PayService {
    @Override
    public void pay() {
        System.out.println("微信支付");
    }
}
public class AlipayService implements PayService {
    @Override
    public void pay() {
        System.out.println("支付宝支付");
    }
}

org.snippets.ioc.java.spi.PayService

org.snippets.ioc.java.spi.AlipayService
org.snippets.ioc.java.spi.WeixinpayService

ServiceLoader<PayService> serviceLoader=ServiceLoader.load(PayService.class);

for(PayService ele:serviceLoader){
    ele.pay();
}

public class Person implements Remote, Serializable {

    private static final long serialVersionUID = 1L;
    private String name;
    private String passWord;

    // 省略set / get方法
}

public static void initPerson()throws Exception{
    //配置JNDI工厂和JNDI的url和端口。如果没有配置这些信息，将会出现NoInitialContextException异常
    LocateRegistry.createRegistry(3000);
    System.setProperty(Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.rmi.registry.RegistryContextFactory");
    System.setProperty(Context.PROVIDER_URL,"rmi://localhost:3000");


    InitialContext ctx=new InitialContext();

    //实例化person对象
    Person p=new Person();
    p.setName("zc");
    p.setPassword("123");

    //将person对象绑定到JNDI服务中，JNDI的名字叫做：person。
    ctx.bind("person",p);
    ctx.close();
}

public static void findPerson()throws Exception{
    //因为前面已经将JNDI工厂和JNDI的url和端口已经添加到System对象中，这里就不用在绑定了
    InitialContext ctx=new InitialContext();

    //通过lookup查找person对象
    Person person=(Person)ctx.lookup("person");

    //打印出这个对象
    System.out.println(person.toString());
    ctx.close();
}