servlet中如何访问spring容器

 package com.web.action;

    import java.util.ArrayList;

    import java.util.List;

    import javax.servlet.http.HttpServlet;

    import javax.servlet.http.HttpServletRequest;

    import javax.servlet.http.HttpServletResponse;

    import org.springframework.web.context.WebApplicationContext;

    import org.springframework.web.context.support.WebApplicationContextUtils;

    import com.pojo.Products;

    import com.service.IWorksService;

    public class Test extends HttpServlet{

          private IWorksService  worksService;

          private WebApplicationContext wac;

          public void init(){

              wac =WebApplicationContextUtils.getRequiredWebApplicationContext(this.getServletContext());

          }

        protected void doGet(HttpServletRequest req,HttpServletResponse resp){

            System.out.println("servlet ---------------------------------------------------");

            String className=req.getParameter("className");

            List list=new ArrayList();

            if(className!=null&&className.equals("worksService")){

                worksService=(IWorksService)wac.getBean("worksService");

                wac = (WebApplicationContext)this.getServletContext().getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);

                try{

                    list=worksService.getWorksList(new Products(), 0);

                    System.out.println("list size"+list.size());

                }catch(Exception e){

                    e.printStackTrace();

                }

            }

            try{

                resp.getWriter().append("list size|"+list.size());

                resp.getWriter().flush();

            }catch(Exception e){

                e.printStackTrace();

            }

        }

    }
    IWorksService 为spring中定义的一个服务接口:

    package com.web.action;

    import java.util.ArrayList;

    import java.util.List;

    import javax.servlet.http.HttpServlet;

    import javax.servlet.http.HttpServletRequest;

    import javax.servlet.http.HttpServletResponse;

    import org.springframework.web.context.WebApplicationContext;

    import org.springframework.web.context.support.WebApplicationContextUtils;

    import com.pojo.Products;

    import com.service.IWorksService;

    public class Test extends HttpServlet{

       private IWorksService  worksService;

       private WebApplicationContext wac;

          public void init(){

           wac =WebApplicationContextUtils.getRequiredWebApplicationContext(this.getServletContext());

          }

      protected void doGet(HttpServletRequest req,HttpServletResponse resp){

        System.out.println("servlet ---------------------------------------------------");

        String className=req.getParameter("className");

        List list=new ArrayList();

        if(className!=null&&className.equals("worksService")){

         worksService=(IWorksService)wac.getBean("worksService");

         wac = (WebApplicationContext)this.getServletContext().getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);

         try{

          list=worksService.getWorksList(new Products(), 0);

          System.out.println("list size"+list.size());

         }catch(Exception e){

          e.printStackTrace();

         }

        }

        try{

           resp.getWriter().append("list size|"+list.size());

           resp.getWriter().flush();

        }catch(Exception e){

         e.printStackTrace();

        }

       }

    }
    IWorksService 为spring中定义的一个服务接口:
     <bean id="worksService"
      class="com.service.impl.WorksServiceImpl">
      <property name="worksDao">
       <ref bean="worksDao" />
      </property>
      <property name="divi">
       <ref bean="diviPageUtil" />
      </property>
     </bean>

     <bean id="worksService"
      class="com.service.impl.WorksServiceImpl">
      <property name="worksDao">
       <ref bean="worksDao" />
      </property>
      <property name="divi">
       <ref bean="diviPageUtil" />
      </property>
     </bean>
    可以看出访问sping容器中对象可以通过访问web容器中的固定属性而得到spring容器,进行得到spring容器中的对象