如何解析Opencsv HeaderColumnNameMappingStrategy中的非字符串值

Question

我正在使用HeaderColumnNameMappingStrategy将带有标头的csv文件映射到JavaBean.字符串值解析正常,但csv中的任何"true"或"false"值都不映射到JavaBean,我从PropertyDescriptor获得以下异常:

java.lang.IllegalArgumentException: argument type mismatch

它出现的代码在CsvToBean第64行:

protected T processLine(MappingStrategy<T> mapper, String[] line) throws  
 IllegalAccessException, InvocationTargetException, InstantiationException, IntrospectionException {
    T bean = mapper.createBean();
    for(int col = 0; col < line.length; col++) {
        String value = line[col];
        PropertyDescriptor prop = mapper.findDescriptor(col);
        if (null != prop) {
            Object obj = convertValue(value, prop);
            // this is where exception is thrown for a "true" value in csv
            prop.getWriteMethod().invoke(bean, new Object[] {obj});
        }
    }
    return bean;
}

 protected PropertyEditor getPropertyEditor(PropertyDescriptor desc) throws   
       InstantiationException, IllegalAccessException {
    Class<?> cls = desc.getPropertyEditorClass();
    if (null != cls) return (PropertyEditor) cls.newInstance();
    return getPropertyEditorValue(desc.getPropertyType());
}

我可以确认(通过调试器)此时正确检索到setter方法id.

问题出现在desc.getPropertyEditorClass()中,因为它返回null.我假设原始类型和它的包装器都受支持.他们不是吗？

Answer 1

我遇到了同样的问题.最干净的方法可能是像上面的pritam一样覆盖getPropertyEditor,并为您的特定对象返回一个自定义PropertyEditor.快速而肮脏的方法是以匿名类形式覆盖convertValue,如下所示:

CsvToBean<MyClass> csvToBean = new CsvToBean<MyClass>(){

    @Override
    protected Object convertValue(String value, PropertyDescriptor prop) throws InstantiationException,IllegalAccessException {

        if (prop.getName().equals("myWhatever")) {
            // return an custom object based on the incoming value
            return new MyWhatever((String)value);
        }

        return super.convertValue(value, prop);
    }
};

使用OpenCSV 2.3,这对我来说很好.祝好运!