如何利用反射批量修改java类某一属性的代码详解

时间:2021-08-09 10:49:20

下面看下代码,具体代码如下所示:

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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
        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:

如何利用反射批量修改java类某一属性的代码详解

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原文链接:https://blog.csdn.net/jungeCSND/article/details/107529497