1、我们来体验一下Spring底层两大思想中IOC(Inverse Of Control)

2、IOC控制反转主要利用的就是Java强大的反射机制

这里并没有写数据层，有兴趣的同学可以通过流的方式，来创建我们需要的对象

1)创建一个testreflect的包，然后写MockSpring类的方法getBean

package testreflect;

import java.lang.reflect.Constructor;

import java.lang.reflect.Field;

import java.lang.reflect.Method;

import java.util.Scanner;

public class MockSpring {

public Object getBean (String className) {

Object obj = null;

Scanner input = new Scanner(System.in);

try{

//获取类

Class clazz = Class.forName(className);

//获取对象

obj = clazz.newInstance();

String name = clazz.getSimpleName();

if(name.equals("Character")){

System.out.println("Incompatible Type.");

}else{

Field[] fields = clazz.getDeclaredFields();

for(Field f:fields){

String fieldName = f.getName();

System.out.println("请设置"+fieldName+"属性：");

//获取setName类似的驼峰属性设置方法

StringBuilder sb = new StringBuilder("set");

sb.append(fieldName.substring(0,1).toUpperCase().concat(fieldName.substring(1)));

String value = input.nextLine();

//获取属性的类型，比如name的String类

Class fieldType = f.getType();

//获取带String参数的构造函数

Constructor con = fieldType.getConstructor(String.class);

//获取方法

Method m = clazz.getDeclaredMethod(sb.toString(),fieldType);

m.setAccessible(true);

m.invoke(obj,con.newInstance(value));

}

}

}catch(Exception e){

e.printStackTrace();

}

return obj;

}

}

2)创建一个测试类

注意：要有set方法，我们的目的是以后从文件读取的流能直接转为对象

package testreflect;

public class Person {

private String name;

private Integer age;

private String sex;

public Person () {}

public Person (String name,Integer age,String sex){

this.name = name;

this.age = age;

this.sex = sex;

}

public void setName (String name){

this.name = name;

}

public void setAge (Integer age){

this.age = age;

}

public void setSex (String sex){

this.sex = sex;

}

public String getName (){

return this.name;

}

}

3)测试

package testreflect;

public class Test {

public static void main (String[] args){

MockSpring ms = new MockSpring();

Person p = (Person)ms.getBean("testreflect.Person");

System.out.println(p.getName());

}

}

4)根据提示设置name,age,sex属性为"飞鸿","18","男"

output:飞鸿