我就废话不多说了，大家还是直接看代码吧~

package test.refect; 
public class Student {
	// 姓名
	private String name;
	// 年龄
	private String age;
	// 住址
	private String address;
 
	public String getName() {
		return name;
	}
 
	public void setName(String name) {
		this.name = name;
	}
 
	public String getAge() {
		return age;
	}
 
	public void setAge(String age) {
		this.age = age;
	}
 
	public String getAddress() {
		return address;
	}
 
	public void setAddress(String address) {
		this.address = address;
	}
 
	@Override
	public String toString() {
		return "Student [name=" + name + ", age=" + age + ", address=" + address + "]";
	}
	
	public void sayHello(Book book){
		System.out.println(book.getName());		
	}
}

package test.refect; 
public class Book {
	private String name; 
	public String getName() {
		return name;
	} 
	public void setName(String name) {
		this.name = name;
	} 
}

package test.refect; 
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import com.alibaba.fastjson.JSONObject; 
public class ExecuteWithFastJson { 
	public static <T> void main(String[] args) {
		
		// Student str --> Student 主类
		String str = "test.refect.Student";
		Class<?> clazz = null;
		try {
			clazz = Class.forName(str);
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
 
		// Book实体 str --> Book 参数类
		String bookStr = "test.refect.Book";
		Class<?> bookClazz = null;
		try {
			bookClazz = Class.forName(bookStr);
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
 
		// json --> Book 将参数类转为JSONOBJECT
		String bookJson = "{\"name\":\"Java\"}";
		
 
		// 实例化参数类
		T t = (T) JSONObject.parseObject(bookJson, bookClazz);
		
		// 将参数类注入到主类
		Method method =null;
		try {
			method = clazz.getDeclaredMethod("sayHello", bookClazz);
		} catch (NoSuchMethodException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SecurityException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
 
		// 执行主类
		try {
			method.invoke(clazz.newInstance(), t);
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (InvocationTargetException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (InstantiationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

补充：使用fastjson 进行jsonObject转实体类对象

<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>fastjson</artifactId>
  <version>1.2.7</version>
</dependency>

首先引入相关jar包，

假设有一个实体类User

public class User{
 private int id;
 private String name;  
}

然后通过fastJson进行类型转换

public static void main(String[] args){
  String userString = "{"id":1,"name","lz"}";
  JSONObject userJson = JSONObject.parseObject(userString);
  User user = JSON.toJavaObject(userJson,User.class);
  
}

以上为个人经验，希望能给大家一个参考，也希望大家多多支持呐喊教程。如有错误或未考虑完全的地方，望不吝赐教。

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