描述：反射工具类，获取类的构造方法、Get/Set方法、属性、属性值；
import com.maxinhai.world.entity.Music;
import java.lang.reflect.*;
import java.text.SimpleDateFormat;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.*;
/**
* @program: world
* @description: 类反射工具类
* @author: XinHai.Ma
* @create: 2021-06-30 17:24
*/
@SuppressWarnings("all")
public class ClassUtils {
/**
* 利用反射获取类中的所有方法包括父类
* @param object
* @return
*/
public static List<String> getMethods(Object object) {
List<String> result = new ArrayList<>();
Class<?> objClass = object.getClass();
// 获取构造方法
Constructor<?>[] constructors = objClass.getConstructors();
for (Constructor<?> constructor : constructors) {
String name = constructor.getName();
result.add(name);
}
// 获取get/set方法
Method[] methods = objClass.getDeclaredMethods();
for (Method method : methods) {
String methodName = method.getName();
result.add(methodName);
}
// 父类
Type superclassType = objClass.getGenericSuperclass();
if("com.maxinhai.world.entity.AutoBaseEntity".equals(superclassType.getTypeName())
|| "com.maxinhai.world.entity.AutoBaseEntity".equals(superclassType.getTypeName())) {
Class<?> superclass = objClass.getSuperclass();
// 获取get/set方法
Method[] superMethods = superclass.getDeclaredMethods();
for (Method method : superMethods) {
String methodName = method.getName();
result.add(methodName);
}
// 获取构造方法
Constructor<?>[] superConstructors = superclass.getConstructors();
for (Constructor<?> constructor : superConstructors) {
String name = constructor.getName();
result.add(name);
}
}
return result;
}
/**
* 利用反射获取对象属性和值,不包含父类
* @param object
* @param objClass
* @param result
* @throws NoSuchMethodException
* @throws InvocationTargetException
* @throws IllegalAccessException
*/
private static void getValues(Object object, Class objClass, Map<String, String> result) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
Field[] fields = objClass.getDeclaredFields();
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
for (Field field : fields) {
String fieldName = field.getName();
Type type = field.getGenericType();
if("java.lang.String".equals(type.getTypeName())) {
Method method = (Method) objClass.getMethod("get" + Character.toUpperCase(fieldName.charAt(0))+fieldName.substring(1));
String value = (String) method.invoke(object);
if (value != null) {
result.put(fieldName, value);
}
}
if("java.lang.Long".equals(type.getTypeName())) {
Method method = (Method) objClass.getMethod("get" + Character.toUpperCase(fieldName.charAt(0))+fieldName.substring(1));
Long value = (Long) method.invoke(object);
if (value != null) {
result.put(fieldName, String.valueOf(value));
}
}
if("java.lang.Integer".equals(type.getTypeName())) {
Method method = (Method) objClass.getMethod("get" + Character.toUpperCase(fieldName.charAt(0))+fieldName.substring(1));
Integer value = (Integer) method.invoke(object);
if (value != null) {
result.put(fieldName, String.valueOf(value));
}
}
if("java.lang.Double".equals(type.getTypeName())) {
Method method = (Method) objClass.getMethod("get" + Character.toUpperCase(fieldName.charAt(0))+fieldName.substring(1));
Double value = (Double) method.invoke(object);
if (value != null) {
result.put(fieldName, String.valueOf(value));
}
}
if("java.time.LocalDateTime".equals(type.getTypeName())) {
Method method = (Method) objClass.getMethod("get" + Character.toUpperCase(fieldName.charAt(0))+fieldName.substring(1));
LocalDateTime value = (LocalDateTime) method.invoke(object);
if (value != null) {
result.put(fieldName, formatter.format(value));
}
}
if("java.util.Date".equals(type.getTypeName())) {
Method method = (Method) objClass.getMethod("get" + Character.toUpperCase(fieldName.charAt(0))+fieldName.substring(1));
LocalDateTime value = (LocalDateTime) method.invoke(object);
if (value != null) {
result.put(fieldName, format.format(value));
}
}
}
}
/**
* 利用反射获取对象属性和值,包含父类
* @param object
* @return
* @throws InvocationTargetException
* @throws IllegalAccessException
* @throws NoSuchMethodException
*/
public static Map<String, String> getValues(Object object) throws InvocationTargetException, IllegalAccessException, NoSuchMethodException {
Map<String, String> result = new HashMap<>();
Class<?> objClass = object.getClass();
getValues(object, objClass, result);
Type superclassType = objClass.getGenericSuperclass();
if("com.maxinhai.world.entity.AutoBaseEntity".equals(superclassType.getTypeName())
|| "com.maxinhai.world.entity.AutoBaseEntity".equals(superclassType.getTypeName())) {
Class<?> superclass = objClass.getSuperclass();
Field[] superFields = superclass.getDeclaredFields();
for (Field field : superFields) {
getValues(object, superclass, result);
}
}
return result;
}
/**
* 利用反射获取对象所有属性和数据类型
* @param object
* @return
* @throws InvocationTargetException
* @throws IllegalAccessException
* @throws NoSuchMethodException
*/
public static Map<String, String> getAttributes(Object object) throws InvocationTargetException, IllegalAccessException, NoSuchMethodException {
Map<String, String> result = new HashMap<>();
Class<?> objClass = object.getClass();
Field[] fields = objClass.getDeclaredFields();
for (Field field : fields) {
String fieldName = field.getName();
Type type = field.getGenericType();
String typeName = type.getTypeName();
result.put(fieldName, typeName);
}
Type superclassType = objClass.getGenericSuperclass();
if("com.maxinhai.world.entity.AutoBaseEntity".equals(superclassType.getTypeName())
|| "com.maxinhai.world.entity.AutoBaseEntity".equals(superclassType.getTypeName())) {
Class<?> superclass = objClass.getSuperclass();
Field[] superFields = superclass.getDeclaredFields();
for (Field field : superFields) {
String fieldName = field.getName();
Type type = field.getGenericType();
String typeName = type.getTypeName();
result.put(fieldName, typeName);
}
}
return result;
}
public static void main(String[] args) throws Exception {
Music music = new Music();
// 获取类属性
Map<String, String> attributes = getAttributes(music);
attributes.forEach((k,v) -> {
System.out.println(k + "=>" + v);
});
System.out.println("");
// 获取类属性值
Map<String, String> values = getValues(music);
values.forEach((k,v) -> {
System.out.println(k + "=>" + v);
});
System.out.println("");
// 获取类方法
List<String> methods = getMethods(music);
methods.forEach(method -> {
System.out.println(method);
});
}
}