package utils.copyProperty;
 
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
 
public class CopyProperty {
	public static PropertyDescriptor[] getPropertyDescriptor(Class<?> clz) throws Exception {
		PropertyDescriptor[] propertyDescriptorsFull = 
				Introspector.getBeanInfo(clz).getPropertyDescriptors();
		PropertyDescriptor[] ps = new PropertyDescriptor[propertyDescriptorsFull.length - 1];
		int index = 0;
		for (PropertyDescriptor p : propertyDescriptorsFull) {
			if (!p.getName().equals("class")) {
				ps[index++] = p;
			}
		}
		return ps;
	}
	public static <T> T setPropertyValue(T t,String propertyName,Object value){
		try{
		//獲取屬性描述類
		PropertyDescriptor[] pdArr = getPropertyDescriptor(t.getClass());
		PropertyDescriptor myPD = null;
		for (PropertyDescriptor p : pdArr) {
			//類屬性與傳入屬性對比，為了統(tǒng)一都轉(zhuǎn)小寫
			if(p.getName().toLowerCase().equals(propertyName.toLowerCase())){
				//獲取需要修改屬性
				myPD = p;
				break;
			}
		}
		//根據(jù)需要修改屬性，修改屬性值
		if(myPD!=null){
			Method writeMethod = myPD.getWriteMethod();
			if(myPD.getPropertyType().getName().equals("java.lang.String"))
			{
				writeMethod.invoke(t, value.toString());
			}else{
				writeMethod.invoke(t, value);
			}
			
		}
		}catch(Exception e){
			e.printStackTrace();
		}
		return t;
	}
	public static <T>Collection<T> setPropertyValue(Collection<T> coll,String propertyName,Object value) {
		if(coll!=null)
		for(T t : coll){
			setPropertyValue(t,propertyName,value);
		}
		return coll;
	}
	
	public static void main(String args[]) throws Exception{
		ArrayList<Student> students=new ArrayList();
		Student student=new Student();
		Student student1=new Student();
		students.add(student);
		students.add(student1);
		for (Student stu:students){
			System.out.println("賦值之前:"+stu.getValidStatus());
		}//修改validStatus為0
		CopyProperty.setPropertyValue(students, "validStatus", "0");
		for (Student stu:students){
			System.out.println("賦值之后:"+stu.getValidStatus());
		}
		
		
	}
	public static class Student{
 
		private String name ;
		private String sex;
		private String validStatus="1";
		public String getName() {
			return name;
		}
		public void setName(String name) {
			this.name = name;
		}
		public String getSex() {
			return sex;
		}
		public void setSex(String sex) {
			this.sex = sex;
		}
		public String getValidStatus() {
			return validStatus;
		}
		public void setValidStatus(String validStatus) {
			this.validStatus = validStatus;
		}
		
	}
 
}