在两个实体类里，有相同的属性，有不同的属性，相同名称的属性类型还可能不同，如何实现相同属性的拷贝/复制呢？

实体类

代码清单1：Neo4jNode.java

package com.graph.domain;

import lombok.Data;

import java.util.HashMap;

import java.util.Map;

/**

* @Author:-https://www.4spaces.org

*/

@Data

public class Neo4jNode {

private String id;

private String label;

private String labelName;

private String typeUri;

private Double x;

private Double y;

private Map properties = new HashMap<>();

}

代码清单2：SigmaNode.java

package com.graph.domain;

import lombok.Data;

import java.util.List;

import java.util.Map;

/**

* @Author:-https://www.4spaces.org

*/

@Data

public class SigmaNode {

private String id;

private String label;

private String labelName;

private String typeUri;

private Double x;

private Double y;

private List> properties;

}

方式1：org.springframework.beans.BeanUtils

package com.graph.domain;

import com.alibaba.fastjson.JSON;

import org.springframework.beans.BeanUtils;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

public class BeanCopyExample {

public static void main(String[] args) {

SigmaNode sigmaNode = new SigmaNode();

sigmaNode.setId("1");

sigmaNode.setLabel("https://www.4spaces.org");

sigmaNode.setLabelName("");

Map propertieMap = new HashMap<>();

propertieMap.put("title", "博客");

propertieMap.put("subject", "技术");

List> properties = new ArrayList<>();

properties.add(propertieMap);

sigmaNode.setProperties(properties);

Neo4jNode neo4jNode = new Neo4jNode();

BeanUtils.copyProperties(sigmaNode, neo4jNode);

System.out.println(JSON.toJSONString(neo4jNode));

}

}

方式2：org.apache.commons.beanutils.BeanUtils

package com.graph.domain;

import com.alibaba.fastjson.JSON;

import org.apache.commons.beanutils.BeanUtils;

import java.lang.reflect.InvocationTargetException;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

public class BeanCopyExample {

public static void main(String[] args) {

SigmaNode sigmaNode = new SigmaNode();

sigmaNode.setId("1");

sigmaNode.setLabel("https://www.4spaces.org");

sigmaNode.setLabelName("");

Map propertieMap = new HashMap<>();

propertieMap.put("title", "博客");

propertieMap.put("subject", "技术");

List> properties = new ArrayList<>();

properties.add(propertieMap);

sigmaNode.setProperties(properties);

Neo4jNode neo4jNode = new Neo4jNode();

try {

BeanUtils.copyProperties(sigmaNode, neo4jNode);

} catch (IllegalAccessException e) {

e.printStackTrace();

} catch (InvocationTargetException e) {

e.printStackTrace();

}

System.out.println(JSON.toJSONString(neo4jNode));

}

}

总结

由于两个实体类properties属性类型不一样，org.apache.commons.beanutils.BeanUtils会抛出：java.lang.IllegalArgumentException异常，而org.springframework.beans.BeanUtils则不会对该属性赋值，不会抛出异常。

参考文章：