如何利用反射批量修改java类某一属性的代码详解

下面看下代码，具体代码如下所示：

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{
		//获取属性描述类
		propertydescriptor[] pdarr = getpropertydescriptor(t.getclass());
		propertydescriptor mypd = null;
		for (propertydescriptor p : pdarr) {
			//类属性与传入属性对比，为了统一都转小写
			if(p.getname().tolowercase().equals(propertyname.tolowercase())){
				//获取需要修改属性
				mypd = p;
				break;
			}
		}
		//根据需要修改属性，修改属性值
		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("赋值之前:"+stu.getvalidstatus());
		}//修改validstatus为0
		copyproperty.setpropertyvalue(students, "validstatus", "0");
		for (student stu:students){
			system.out.println("赋值之后:"+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;
		}
		
	}
 
}

把student的validstatus状态都修改为0，测试效果如下：

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