<!-- 解决懒加载问题 -->
<filter>
<filter-name>openSessionInViewFilter</filter-name>
<filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>openSessionInViewFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
在web.xml文件里加上这个代码,将session提前打开,也延后关闭
还有一种,是同一个原理不同的版本
<!-- notSession过滤器 -->
<filter>
<filter-name>notSession</filter-name>
<filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>notSession</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>