The Java reflection mechanism determines whether all attribute values of the Object object are empty.

Original link: https://blog.csdn.net/zhouzhiwengang/article/details/89028758

This article is only used as an example of usage and does not implement any specific functions. In this test, all null or null attribute names are printed.

package test;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

import org.eclipse.jdt.internal.compiler.ast.ThisReference;

import entity.F100018DTO;

/**
 * <p>
 * Title: F100018Utils
 * </p>
 * <p>
 * Description:
 * </p>
 * 
 * @author JX1811
 * @date 2019年8月21日
 */
public class F100018Utils {

	/**
	 * <p>Title: validateFild</p> 
	 * <p>Description: 这是一个以反射机制为基础的判断对象内部的属性是否为空的方法</p>
	 * @param obj      要判断的对象实例
	 * @param exclFild 放行的属性, 不需要做判断的属性
	 * @return 布尔类型, 这个可以根据需求做出变更
	 */  
	public static boolean validateFild(Object obj, List<String> exclFild) {

		boolean target = false;

		for (Field f : obj.getClass().getDeclaredFields()) {
			f.setAccessible(true);
			try {
				String name = f.getName();
				// 判断属性名称是否在排除属性值中
				if (!exclFild.contains(name)) {
					if (f.get(obj) == null || f.get(obj).equals("")) {
						// 判断字段是否为空，并且对象属性中的基本都会转为对象类型来判断
						target = true;
						System.out.println(name);
					}
				}
			} catch (IllegalArgumentException e) {
				target = false;
				System.out.println("对象属性解析异常" + e.getMessage());
				return target;
			} catch (IllegalAccessException e) {
				target = false;
				System.out.println("对象属性解析异常" + e.getMessage());
				return target;
			}
		}
		return target;
	} 
	
	/**
	 * <p>Title: main</p> 
	 * <p>Description:调用的案例 </p>
	 * @param args
	 */  
	public static void main(String[] args) {
		F100018DTO f100018dto = new F100018DTO(null, "", null, null);
		List<String> exclFild = new ArrayList<String>();
		exclFild.add("age");
		System.out.println(F100018Utils.validateFild(f100018dto, exclFild));
	}

}

// Test class

package entity;


/** 
* <p>Title: F100018DTO</p>  
* <p>Description: 测试使用的实体类</p>  
* @author JX1811
* @date 2019年8月21日  
*/  
public class F100018DTO {

	private String name;
	private String password;
	private Integer age;
	private String graduate;	
	
	public F100018DTO() {}

	public F100018DTO(String name, String password, Integer age, String graduate) {
		this.name = name;
		this.password = password;
		this.age = age;
		this.graduate = graduate;
	}	
	
	public String getName() {return name;}
	public void setName(String name) {this.name = name;}
	public String getPassword() {return password;}
	public void setPassword(String password) {this.password = password;}
	public int getAge() {	return age;}
	public void setAge(Integer age) {this.age = age;}
	public String getGraduate() {return graduate;}
	public void setGraduate(String graduate) {this.graduate = graduate;} 
	
}

Newbies, please advise.