情景:在开发过程中,需要将两个对象实体的值进行对比
处理:使用BeanUtils.describe将两个对象转换成Map进行遍历对比数据,注意:
BeanUtils是org.apache.commons.beanutils下的
问题:发现BeanUtils.describe转换后的Map的泛型是<String,String>此时获取到的字段如果是数组类型的话只获取了第一个元素
解决:使用PropertyUtils.describe方法的到的Map的泛型是<String,Object>此时可以正常获取到数据
BeanUtils.describe和PropertyUtils.describe都是将对象转换成Map,如果对象的字段存在数组或者集合类型的,使用PropertyUtils.describe。
Map<String, String> map = BeanUtils.describe(Object bean);
Map<String, Object> map = PropertyUtils.describe(Object bean);
代码如下:
@Data
public class Person implements Serializable {//实体
/**
*
*/
private static final long serialVersionUID = 3193754045080382621L;
private String name;
private Integer sex;
private Integer age;
private String school;
private String[] hobby;
private List<String> place;
}
public static void main(String[] args) {//测试
Person p = new Person();
p.setName("Akili");
p.setSex(1);
p.setAge(24);
p.setSchool(null);
p.setHobby(new String[] { "摄影", "旅行", "家居", "做饭" });
p.setPlace(Lists.newArrayList("北京","深圳","广州","北海"));
Map<String, String> beanLog = new HashMap<String, String>();
Map<String, Object> propertyLog = new HashMap<String, Object>();
try {
beanLog = BeanUtils.describe(p);
} catch (Exception e) {
LOG.info("error message", e);
return;
}
try {
propertyLog = PropertyUtils.describe(p);
} catch (Exception e) {
LOG.info("error message", e);
return;
}
if (beanLog != null && propertyLog != null) {
for (Map.Entry<String, String> entry : beanLog.entrySet()) {
Map<String, String> temp = new HashMap<String, String>();
if (entry.getKey().equals("hobby")) {
System.out.println("beanLog hobby --- :" + entry.getValue());
System.out.println("propertyLog hobby --- :" + Arrays.toString((String[])propertyLog.get(entry.getKey())));
}
if(entry.getKey().equals("place")){
System.out.println("beanLog place --- :" + entry.getValue());
System.out.println("propertyLog place --- :" + propertyLog.get(entry.getKey()));
}
}
}
}
结果:
beanLog place --- :北京
propertyLog place --- :[北京, 深圳, 广州, 北海]
beanLog hobby --- :摄影
propertyLog hobby --- :[摄影, 旅行, 家居, 做饭]