代码之家 › 专栏 › 技术社区 › Josemy

如何为任何对象创建JobParameterBuilder?

spring-batch spring java

Josemy · 技术社区 · 9 年前

我试图创建一个方法,用对象的每个成员生成JobParameters对象。这是我目前得到的:

public static JobParameters getAttributesAsJobParameters(Object objectToConvert) throws IllegalAccessException {
    JobParametersBuilder jobParametersBuilder = new JobParametersBuilder();

    for (Field field : objectToConvert.getClass().getDeclaredFields()) {
        field.setAccessible(true);
        jobParametersBuilder.addLong(field.getName(), (Long) field.get(objectToConvert));
    }

    return jobParametersBuilder.toJobParameters();
}

2 回复 | 直到 9 年前

Erich Schreiner 9 年前

根据 https://docs.oracle.com/javase/tutorial/reflect/member/fieldTypes.html ,您可以使用 field.getType() 确定数据类型。

Long 或 long (原语)如下所示: Check type of primitive field

Josemy 9 年前

Eric 我找到了一种可以处理更“复杂”对象的解决方案:

public static JobParametersBuilder getAttributesAsJobParameters(Object objectToConvert) throws IllegalAccessException {
    JobParametersBuilder jobParametersBuilder = new JobParametersBuilder().addLong("time", System.currentTimeMillis());

    for (Field field : objectToConvert.getClass().getDeclaredFields()) {
        field.setAccessible(true); // We need this to access to attributes if they are private
        if (!field.getType().isPrimitive()) {
            jobParametersBuilder = getAttributesAsJobParameters(field.get(objectToConvert));
        } else {
            matchJobParametersType(jobParametersBuilder, field, objectToConvert);
        }
    }
    return jobParametersBuilder;
}

public static void matchJobParametersType(JobParametersBuilder jobParametersBuilder, Field fieldOfObject, Object object) throws IllegalAccessException {
    String dataTypeOfField = fieldOfObject.getType().getSimpleName();

    switch (dataTypeOfField) {
        case "long":
            jobParametersBuilder.addLong(fieldOfObject.getName(), (Long) fieldOfObject.get(object));
            break;
        case "String":
            jobParametersBuilder.addString(fieldOfObject.getName(), (String) fieldOfObject.get(object));
            break;
        default:
            throw new JobParametersException("Data type " + dataTypeOfField + " not defined");
    }

}

推荐文章