反射一属性赋值一用反射机制给相同属性名赋值

利用反射机制给相同属性名赋值

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package demo.springboot.reflection;

import org.testng.annotations.Test;
import java.lang.reflect.Field;
import java.util.Date;

/**
 * 

 *  利用反射进行相同属性的赋值
 * 
 *
 * @author shan yue feng cheng
 * @date 2019/5/23 0023
 */
public class ClassUtil {

    //需要最后赋的值
    public static final User user = new User();
    static{
        user.setCreateTime(new Date());
        user.setCreator("luocheng");
    }

    //创建指定类型的返回Object
    public  T createReflectionEntity(Object object,Class clazz) throws Exception{
        Field[] fields = clazz.getDeclaredFields();
        for (Field field : fields){
            object = setFieldValueByFieldName(field.getName(),object);
        }
        return (T) object;
        /**
         * 创建对象的几种方式
         * 1new
         * 2clone
         * 3反序列化
         * 4反射
         * Object o = clazz.newInstance();
         */
    }

    public Object setFieldValueByFieldName(String fieldName, Object object) throws Exception{
        Class aClass = object.getClass();
        Field declaredField = aClass.getDeclaredField(fieldName);
        //放开类型检查
        declaredField.setAccessible(true);
        if ("creator".equals(fieldName)){
            declaredField.set(object,user.getCreator());

        }
        if("createTime".equals(fieldName)){
            declaredField.set(object,user.getCreateTime());
        }
        return object;
    }

    @Test
    public void test() throws Exception{
        LocalUser localUser = new LocalUser();
        localUser.setUserName("localLuoCheng");
        ClassUtil classUtil = new ClassUtil();
        LocalUser reflectionEntity = classUtil.createReflectionEntity(localUser, LocalUser.class);
        System.out.println(reflectionEntity);
    }
}

//想要给LocalUser赋值
class LocalUser{
    private String userName;
    private String creator;
    private Date createTime;

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getCreator() {
        return creator;
    }

    public void setCreator(String creator) {
        this.creator = creator;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    @Override
    public String toString() {
        return "LocalUser{" +
                "userName='" + userName + '\'' +
                ", creator='" + creator + '\'' +
                ", createTime=" + createTime +
                '}';
    }
}

class User{
    private String creator;
    private Date createTime;

    public String getCreator() {
        return creator;
    }

    public void setCreator(String creator) {
        this.creator = creator;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }
}