数据实体字段、字段类型、字段对应的值等获取

/**
 * 获取数据实体字段、字段类型、字段对应的值等
 *
 * @author: NPF
 * @date: 2018/2/26.
 */
public class ObjectUtil {

private static ObjectUtil mInstance;

private ObjectUtil() {
}

/**
 * 单例模式获取实例
 */
public static ObjectUtil getInstance() {
    if (null == mInstance) {
        synchronized (ObjectUtil.class) {
            if (null == mInstance) {
                mInstance = new ObjectUtil();
            }
        }
    }
    return mInstance;
}

/**
 * 根据属性名获取属性值
 *
 * @param fieldName
 * @param o
 * @return
 */
public Object getFieldValueByName(String fieldName, Object o) {
    try {
        String firstLetter = fieldName.substring(0, 1).toUpperCase();
        String getter = "get" + firstLetter + fieldName.substring(1);
        Method method = o.getClass().getMethod(getter, new Class[]{});
        Object value = method.invoke(o, new Object[]{});
        return value;
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
}

/**
 * 获取属性名数组
 *
 * @param classz
 * @return
 */
public String[] getFiledName(Class classz) {
    Field[] fields = classz.getDeclaredFields();
    String[] fieldNames = new String[fields.length];
    for (int i = 0; i < fields.length; i++) {
        System.out.println(fields[i].getType());
        fieldNames[i] = fields[i].getName();
    }
    return fieldNames;
}

/**
 * 获取属性类型(type)，属性名(name)，属性值(value)的map组成的list
 *
 * @param o
 * @return
 */
public List getFiledsInfo(Object o) {
    Field[] fields = o.getClass().getDeclaredFields();
    String[] fieldNames = new String[fields.length];
    List list = new ArrayList();
    Map infoMap = null;
    for (int i = 0; i < fields.length; i++) {
        infoMap = new HashMap();
        infoMap.put("type", fields[i].getType().toString());
        infoMap.put("name", fields[i].getName());
        infoMap.put("value", getFieldValueByName(fields[i].getName(), o));
        list.add(infoMap);
    }
    return list;
}

/**
 * 获取对象的所有属性值，返回一个对象数组
 *
 * @param o
 * @return
 */
public Object[] getFiledValues(Object o) {
    String[] fieldNames = this.getFiledName(o.getClass());
    Object[] value = new Object[fieldNames.length];
    for (int i = 0; i < fieldNames.length; i++) {
        value[i] = this.getFieldValueByName(fieldNames[i], o);
    }
    return value;
}}