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servlet+Spring+hibernate请求线程绑定hibernate的session控制懒加载-OpenSessionInViewFilter

程序员文章站 2022-07-14 12:05:02
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1、配置web.xml

<!-- 监听器 -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:applicationContext.xml</param-value>
	</context-param>
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	<!-- -->
	<!--Hibernate Open Session in View Filte -->
	<filter>
		<filter-name>hibernateFilter</filter-name>
		<filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
		<!-- singleSession默认为true,若设为false则等于没用OpenSessionInView -->
		<init-param>
			<param-name>singleSession</param-name>
			<param-value>true</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>hibernateFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

2、获取application
private static final long serialVersionUID = 7178222076194777660L;
	UserServiceImpl userService;
	IRoleService roleService;
	@Override
	public void init() throws ServletException {
                //获取application必须使用在web.xml中实例化的application,要不然spring无法过滤url
		 ApplicationContext app=WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());
		userService = app.getBean("UserServiceImpl", UserServiceImpl.class);
		roleService=app.getBean(RoleServiceImpl.class);
		
	}
接下来就是使用dao进行增删改查了,这样不用自己控制懒加载,交给spring控制;
不过这样有个很大的弊端就是一旦,用户的网络不好并且高并发的话,会长久占用连接,非常耗损服务器资源;