做网站来钱快,做个网站上百度怎么做,推广策略英文翻译,上海做家教去哪个网站需要做一个参数初始化类#xff0c;当web应用被加载时从数据库里取出相关的参数设置#xff0c;并把这些参数放置到application里#xff0c;jsp页面可以从中取出。1.在web.xml中配置#xff1a; servletservlet-nameDispatcher/servlet-names…需要做一个参数初始化类当web应用被加载时从数据库里取出相关的参数设置并把这些参数放置到application里jsp页面可以从中取出。1.在web.xml中配置 servlet servlet-nameDispatcher/servlet-name servlet-classorg.springframework.web.servlet.DispatcherServlet/servlet-class init-param param-namecontextConfigLocation/param-name param-value/WEB-INF/Dispatcher-servlet.xml,/WEB-INF/applicationContext.xml/param-value /init-param load-on-startup1/load-on-startup /servlet servlet servlet-namecontext/servlet-name servlet-classorg.springframework.web.context.ContextLoaderServlet/servlet-class load-on-startup2/load-on-startup /servlet servlet servlet-nameInitialServlet/servlet-name servlet-classcom.anylinks.billreturn.Web.InitialServlet/servlet-class load-on-startup3/load-on-startup /servlet 2.servlet代码 package com.anylinks.billreturn.Web;import java.util.Collection;import java.util.Iterator;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.springframework.web.context.WebApplicationContext;import org.springframework.web.context.support.WebApplicationContextUtils;import com.anylinks.billreturn.BO.SysParameter;import com.anylinks.billreturn.Service.ISysParameterService;/* * 初始化Servlet从数据库中读取参数表保存在application里 */public class InitialServlet extends HttpServlet { private Log log LogFactory.getLog(this.getClass()); private ISysParameterService sysParameterService; /** * 从数据库中读取参数表保存在application里 * * throwsServletException * if an error occure */ public void init() throws ServletException { log.debug(start to intitail ); //获取WebApplicationContext ServletContext application getServletContext(); WebApplicationContext wac WebApplicationContextUtils .getWebApplicationContext(application); //调用sysParameterService取出所有的系统参数 sysParameterService (ISysParameterService) wac .getBean(sysParameterService); Collection paras sysParameterService.findAllParameters(); log.debug(sys parameters size: paras.size()); //把参数加到application里去 for (Iterator iter paras.iterator(); iter.hasNext();) { SysParameter para (SysParameter) iter.next(); application.setAttribute(para.getParaName(),para.getParaValue()); log.debug(initial parameter: key para.getParaName() , value para.getParaValue()); } }} 需要注意的地方1.仅仅配置一个DispatcherServlet是不够的我开始就是这样然后再servlet里面怎么取都取不到WebApplicationContext 。配置上org.springframework.web.context.ContextLoaderServlet之后才能取的到WebApplicationContext 。2.注意一下load-on-startup3/load-on-startup因为用到spring的hibernateDaoSupport,所以必须在spring加载完之后再加载InitialServlet.
