Java实体类去掉属性值空格

在使用Oracle数据库时经常出现数据库char字段被空字符填充的情况，在写业务代码时需要对字段进行处理，BeanHelper.beanAttributeValueTrim(object);

public class BeanHelper {
    public static void beanAttributeValueTrim(Object bean) throws Exception {
        if (bean != null){
            Field[] fields = bean.getClass().getDeclaredFields();
            for (int i = 0; i < fields.length; i++) {
                Field f = fields[i];
                if (f.getType().getName().equals("java.lang.String")) {
                    String key = f.getName();
                    Object value = getFieldValue(bean, key);
                    if (value == null)
                        continue;
                    setFieldValue(bean, key, value.toString().trim());
                }
            }
        }
    }
    private static Object getFieldValue(Object bean, String fieldName) throws Exception{
        StringBuffer result = new StringBuffer();
        String methodName = result.append("get")
                .append(fieldName.substring(0, 1).toUpperCase())
                .append(fieldName.substring(1)).toString();
        Object rObject = null;
        Method method = null;
        Class[] classArr = new Class[0];
        method = bean.getClass().getMethod(methodName, classArr);
        rObject = method.invoke(bean, new Object[0]);
        return rObject;
    }
    private static void setFieldValue(Object bean, String fieldName, Object value) throws Exception{
        StringBuffer result = new StringBuffer();
        String methodName = result.append("set")
                .append(fieldName.substring(0, 1).toUpperCase())
                .append(fieldName.substring(1)).toString();
        Class[] classArr = new Class[1];
        classArr[0] = "java.lang.String".getClass();
        Method method = bean.getClass().getMethod(methodName, classArr);
        method.invoke(bean, value);
    }
}