Java反射技术：遍历实体类属性与类型，并实现赋值与获取

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Date;

/**
 * 使用反射技术获取实体类的属性名及其类型，并对其进行操作。
 * @param entity 实体对象实例
 * @throws Exception 可能抛出的各种异常
 */
public class EntityReflection {

  public static void reflectEntity(Object entity) throws Exception {
    // 获取实体类的所有字段
    Field[] fields = entity.getClass().getDeclaredFields();
    for (Field field : fields) {
      field.setAccessible(true); // 设置字段可访问（包括私有字段）
      String fieldName = field.getName(); // 获取字段名称
      Class fieldType = field.getType(); // 获取字段类型

      // 输出字段信息
      System.out.println("Field Name: " + fieldName + ", Type: " + fieldType.getName());

      // 为字段赋值
      if (fieldType == String.class) {
        field.set(entity, "示例字符串");
      } else if (fieldType == int.class || fieldType == Integer.class) {
        field.set(entity, 123);
      } else if (fieldType == double.class || fieldType == Double.class) {
        field.set(entity, 123.45);
      } else if (fieldType == boolean.class || fieldType == Boolean.class) {
        field.set(entity, true);
      } else if (fieldType == Date.class) {
        field.set(entity, new Date());
      }

      // 获取字段值
      Method getter = entity.getClass().getMethod("get" + capitalize(fieldName));
      Object fieldValue = getter.invoke(entity);
      System.out.println("Field Value: " + fieldValue);
    }
  }

  private static String capitalize(String str) {
    return Character.toUpperCase(str.charAt(0)) + str.substring(1);
  }

  public static void main(String[] args) {
    try {
      MyEntity myEntity = new MyEntity();
      reflectEntity(myEntity);
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

// 示例实体类
class MyEntity {
  private String name;
  private int age;
  private double height;
  private boolean active;
  private Date createdAt;

  // Getters and Setters...
}