public class RebateInfo {

    private String userId;  // 用户ID
    private String bizId;   // 业务ID
    private Date bizTime;   // 业务时间
    private String desc;    // 业务描述
    
    // ... get/set
}

    public static RebateInfo filter(Map obj, Map<String, String> link) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        RebateInfo rebateInfo = new RebateInfo();
        for (String key : link.keySet()) {
            Object val = obj.get(link.get(key));
            RebateInfo.class.getMethod("set"   key.substring(0, 1).toUpperCase()   key.substring(1), String.class).invoke(rebateInfo, val.toString());
        }
        return rebateInfo;
    }