概述
通过反射我们可以获取到一个类的属性和方法,但获取父类的private的属性却不可以直接获取,需要递归调用superclass来获取属性
SuperClass.java
public class SuperClass {
private String name;
private String age;
private Date birthday;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
}
SubClass.java
public class SubClass extends SuperClass {
private String sid;
public String getSid() {
return sid;
}
public void setSid(String sid) {
this.sid = sid;
}
}
SubSubClass.java
public class SubSubClass extends SubClass {
private String grade;
public String getGrade() {
return grade;
}
public void setGrade(String grade) {
this.grade = grade;
}
}
保存属性和属性值
SensorData.java
public class SensorData {
private String sensorId;
private Object sensorValue;
public String getSensorId() {
return sensorId;
}
public void setSensorId(String sensorId) {
this.sensorId = sensorId;
}
public Object getSensorValue() {
return sensorValue;
}
public void setSensorValue(Object sensorValue) {
this.sensorValue = sensorValue;
}
@Override
public String toString() {
return "SensorData [sensorId=" + sensorId + ", sensorValue=" + sensorValue + "]";
}
}
TestRe.java 测试类
public class TestRe {
public static void main(String[] args) {
SuperClass cla =new SubSubClass();
//SuperClass cla =new SubClass();
List<SensorData> s = sensorDataList(cla);
for(SensorData ss :s){
System.out.println(ss);
}
}
/**
* 通过反射获取各个属性名称和属性值封装成类
*
* @param sensorDataDto
* @return
*/
public static List<SensorData> sensorDataList(Object sensorDataDto) {
List<SensorData> sensorDatas = new ArrayList<SensorData>();
Class<?> clazz = sensorDataDto.getClass();
try {
exceClass(sensorDataDto, sensorDatas, clazz);
} catch (Exception e) {
}
return sensorDatas;
}
private static void exceClass(Object sensorDataDto, List<SensorData> sensorDatas, Class<?> clazz) throws Exception {
if (clazz != Object.class) {
System.out.println(clazz);
returnclassF(sensorDataDto, sensorDatas, clazz);
Class<?> clazzs = clazz.getSuperclass();
exceClass(sensorDataDto, sensorDatas, clazzs);
}
}
private static void returnclassF(Object sensorDataDto, List<SensorData> sensorDatas, Class<?> clazz) throws Exception {
Field[] fields = clazz.getDeclaredFields();
for (Field field : fields) {
field.setAccessible(true);
SensorData sensorData = new SensorData();
sensorData.setSensorId(field.getName().toString());
sensorData.setSensorValue(field.get(sensorDataDto));
sensorDatas.add(sensorData);
}
}
}
通过
class com.ref.SubSubClass
class com.ref.SubClass
class com.ref.SuperClass
SensorData [sensorId=grade, sensorValue=null]
SensorData [sensorId=sid, sensorValue=null]
SensorData [sensorId=name, sensorValue=null]
SensorData [sensorId=age, sensorValue=null]
SensorData [sensorId=birthday, sensorValue=null]
通过多态可以获取不同类的属性和值
class com.ref.SubClass
class com.ref.SuperClass
SensorData [sensorId=sid, sensorValue=null]
SensorData [sensorId=name, sensorValue=null]
SensorData [sensorId=age, sensorValue=null]
SensorData [sensorId=birthday, sensorValue=null]
最后
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