在servlet中或者在filter中获取spring容器中的bean

1 配置spring文件

hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate"> 
   
  
 jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
   
 

2 在web.xml中加载spring的配置文件

  contextConfigLocation
  
   classpath*:/spring/applicationContext_*.xml
  
 

3 在servlet中获取名字为jdbcTemplat的bean.

public class UserAuthorizationFilter extends HttpServlet {

private WebApplicationContext wac;

    public void init(){
        方法一：wac =WebApplicationContextUtils.getRequiredWebApplicationContext(

             this.getServletContext());

        方法二：wac = WebApplicationContextUtils.getWebApplicationContext(
          this.getServletContext());

       方法一和方法二得到的结果是一样的。

     //wac的类型：org.springframework.web.context.support.XmlWebApplicationContext

    }

public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {

     JdbcTemplate jdbcTemplate = (JdbcTemplate)wac.getBean("jdbcTemplate");

     String sql="select count(*) from customer where name='liwj' and password='1111111'";

     int num=jdbcTemplate.queryForInt(sql);
     if(num==1){