解决webservice（Java）中dao层注入为null问题

首先在webservice指定发布的路径类中实现 ServletContextListener，

例如：

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

public class ILockService implements ServletContextListener{
　　
    
static IUserRecordService userRecordService;

    @Override
    public void contextInitialized(ServletContextEvent sce) {
        userRecordService = WebApplicationContextUtils.getWebApplicationContext(sce.getServletContext()).getBean(IUserRecordService.class);
    }

    @Override
    public void contextDestroyed(ServletContextEvent servletContextEvent) {

    }
        
    public String invoke(String xmlData) {
         //解决该处userRecordService为null的问题
         UserRecord user = userRecordService.queryUserById(Id);
    }
}        

然后在web.xml中监听该类，添加如下：

<listener>
    <description>ILockService</description>
    <listener-class>com.cn.hnust.webservice.server.ILockService</listener-class>
</listener>

好的，这样就可以搞定了！

标签：userRecordService,ServletContextEvent,Java,webservice,dao,ILockService,ServletCo
来源： https://www.cnblogs.com/qianyou304/p/11549697.html