如何让一段代码tomcat启动就运行

1. 在 web.xml 里面配置为 listener

<listener>
<listener-class>com.pandaroid.uniqueonline.UniqueOnlineSessionListener</listener-class>
</listener>

public class UniqueOnlineSessionListener implements HttpSessionListener {
static {
System.out.println("haha static");
}
@Override
public void sessionCreated(HttpSessionEvent arg0) {
}
@Override
public void sessionDestroyed(HttpSessionEvent arg0) {
UniqueOnlineRecords.removeUser(arg0.getSession());
}

}

2. 配置为 Spring 的 bean

<bean id="HiReportService" class="com.pandaroid.hiReport.service.HiReportServiceImpl">
<property name="fileUploadDiskPath" ref="fileupload.disk.path"/>
<property name="fileUploadHttpPath" ref="fileupload.http.path"/>
<property name="jasperService" ref="JasperService"/>
</bean>

public class HiReportServiceImpl implements HiReportService {
static {
System.out.println("Spring bean static !");
}
...
}