当ibatis初始化Bean的时候，会调用无参的构造函数，所以如果Bean中有带参的构造函数，一定得多写个无参的构造函数， 否则ibatis会因找不到构造函数而出错，抛出异常如下：JavaBeansDataExchange could not instantiate result class
添加一行无参构造函数后，成功：
public LabelPrint_inf(){}
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