利用反射操作对象的成员和方法

Love The Way You Lie 2022-07-17 03:24 175阅读 0赞

之前写过的理论博客：[http://blog.csdn.net/u010892841/article/details/51596392][http_blog.csdn.net_u010892841_article_details_51596392]

一个Student对象

一个BeanUtil类用来完成利用反射操作Student对象的成员变量赋值和调用其setter方法。

StudentTest类是程序入口。

package reflect;
 
 
 public class Student {
 	private String name;
 	
 	private String hobby;
 
 	public String getName() {
 		return name;
 	}
 
 	public void setName(String name) {
 		this.name = name;
 	}
 
 	public String getHobby() {
 		return hobby;
 	}
 
 	public void setHobby(String hobby) {
 		this.hobby = hobby;
 	}
 
 	public Student(String name, String hobby) {
 		super();
 		this.name = name;
 		this.hobby = hobby;
 	}
 
 	public Student() {
 		super();
 	}
 	
 	
 	
 }

package reflect;
 
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
 import java.util.Date;
 import java.util.Map;
 import java.util.logging.Logger;
 
 /*
 * @author:qiao pan ma 
 * @time:2016-8-29 16:08:38
 * @a util that can reflect the getter method of a class
 * */
 public class BeanUtil {
 	/*
 	 * create a getter method according to the class name and the data that the getter method needs
 	 * */
 	public static Object getBean(Map<String, Object> data,String className) throws Exception{
 		Class clz=Class.forName(className);
 		Object bean=clz.newInstance();
 		for(String key:data.keySet()){
 			//acquire the name of setter()
 			String setter=String.format("set%s%s", key.substring(0, 1).toUpperCase(),key.substring(1));
 			//get the value of setter()
 			Object value=data.get(key);
 			
 			/*get the Method Object according to the method name 
 			 * and the type of parameters(can get from the Object.getClass)
 			*/
 			try {
 				Method method=clz.getMethod(setter, value.getClass());
 				//the condition is that method must be public
 				if(Modifier.isPublic(method.getModifiers())){
 					method.invoke(bean, value);
 				}
 			} catch (NoSuchMethodException e) {
 				Logger.getLogger(BeanUtil.class.getName()).warning(String.format("没有 %s 方法", setter));
 			}
 		}
 		return bean;
 		
 	}
 }

package reflect;
 
 import java.util.HashMap;
 import java.util.Map;
 
 import org.junit.experimental.theories.Theories;
 
 public class TestStudent {
 	public static void main(String[] args) throws Exception {
 		Map<String, Object> data=new HashMap<String, Object>();
 		data.put("name", "Qiao");
 		data.put("hobby", "travelling");
 		
 		Student student=(Student)BeanUtil.getBean(data, "reflect.Student");
 		
 		System.out.println("the hobby of "+student.getName()+" is "+student.getHobby());
 		//System.out.printf("(%s, %d)%n", student.getName(),student.getHobby());
 	}
 }

执行的结果是    the hobby of Qiao is travelling

[http_blog.csdn.net_u010892841_article_details_51596392]: http://blog.csdn.net/u010892841/article/details/51596392