java中常用的判断数据为空的工具

一些工具的引入可以是的代码变得更加整洁，同时对于数据的判断会更加的全面

pom文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.java</groupId>
    <artifactId>rabbitmq</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!--添加fastjson依赖-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.70</version>
        </dependency>

        <!--StringUtils-->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.4</version>
        </dependency>

        <!--MapUtils-->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-collections4</artifactId>
            <version>4.2</version>
        </dependency>

        <!--CollectionUtils ObjectUtils-->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.9</version>
        </dependency>


    </dependencies>


</project>

　　代码部分

package com.java;

/**
 * @Description:
 * @Author: Yourheart
 * @Create: 2023/5/26 17:29
 */
public class Cat {

    private String name;

    private Integer age;

    private String color;

    public Cat() {
    }

    public Cat(String name, Integer age, String color) {
        this.name = name;
        this.age = age;
        this.color = color;
    }
}

　　

package com.java;

import org.apache.commons.lang3.ObjectUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.Field;


/**
 * @Description:
 * @Author: Yourheart
 * @Create: 2023/5/26 17:44
 */
public class ReflectUtil {

   private static final Logger logger= LoggerFactory.getLogger(ReflectUtil.class);

    /**
     * 判断获取的实体类对象是否为空
     * @param obj
     * @return
     */
    public static boolean isEmpty(Object obj) {
        boolean flag=true;
        if (ObjectUtils.isNotEmpty(obj)) {
            Class<?> aClass = obj.getClass();
            Field[] fields = aClass.getDeclaredFields();

            for (Field field : fields) {
                field.setAccessible(true);
                Object fieldValue = null;
                try {
                    fieldValue = field.get(obj);
                } catch (IllegalAccessException e) {
                    logger.error("获取{},异常:{}",fieldValue,e);
                }
                if (ObjectUtils.isNotEmpty(fieldValue)){
                    flag=false;
                }
            }

            return flag;
        } else {
            return flag;
        }
    }

}

　　

package com.java;

import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.collections4.MapUtils;
import org.apache.commons.lang3.StringUtils;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

/**
 * @Description:
 * @Author: Yourheart
 * @Create: 2023/5/26 16:19
 */
public class UtilsTests {

    private final Logger logger= LoggerFactory.getLogger(UtilsTests.class);

    @Test
    public void test(){
        String string="123";
        String string1=null;
        String string2="";
        logger.info(""+StringUtils.isEmpty(string));
        logger.info(""+StringUtils.isEmpty(string1));
        logger.info(""+StringUtils.isEmpty(string2));

        HashMap<String,Object> map=null;
        HashMap<String,Object> map1=new HashMap<>(16);
        HashMap<String,Object> map2=new HashMap<>(16);
        map2.put("aa","1111");
        logger.info("MapUtils "+ MapUtils.isEmpty(map));
        logger.info("MapUtils "+ MapUtils.isEmpty(map1));
        logger.info("MapUtils "+ MapUtils.isEmpty(map2));

        List<String> list=null;
        List<String> list1=new ArrayList<>(10);
        List<String> list2=new ArrayList<>(10);
        list2.add("111");
        logger.info("CollectionUtils "+ CollectionUtils.isEmpty(list));
        logger.info("CollectionUtils "+ CollectionUtils.isEmpty(list1));
        logger.info("CollectionUtils "+ CollectionUtils.isEmpty(list2));

        Cat cat=new Cat();
        Cat cat1=new Cat("兔兔",1,"黑色");
        Cat cat2=null;

        logger.info("实体类对象判断 "+ ReflectUtil.isEmpty(cat));
        logger.info("实体类对象判断 "+ ReflectUtil.isEmpty(cat1));
        logger.info("实体类对象判断 "+ ReflectUtil.isEmpty(cat2));



    }
}

　　效果图