秒杀系统Web层设计的实现方法

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
           http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
  version="3.1" metadata-complete="true">

  <!-- 修改servlet版本为3.1 -->
  <!-- 配置中央控制器DispatcherServlet -->
  <servlet>
    <servlet-name>seckill-dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!-- 配置springMVC需要加载的配置文件
      spring-dao.xml，spring-service.xml，spring-web.xml
      mybatis -> spring -> springMVC-->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring/spring-*.xml</param-value>
    </init-param>
  </servlet>

  <servlet-mapping>
    <servlet-name>seckill-dispatcher</servlet-name>
    <!-- 默认匹配所有的请求 -->
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns:mvc="http://www.springframework.org/schema/mvc"
   xmlns:conext="http://www.springframework.org/schema/context"
   xsi:schemaLocation="http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
   http://www.springframework.org/schema/mvc
   http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context-3.1.xsd">
   <!--配置Spring MVC-->
   <!--开启SpringMVC注解模式-->
   <!--简化配置
   1、自动注册DefaultAnnotationHandlerMapping,AnnotationMethodHandlerAdapter
   2、提供一系列功能：数据绑定，数字和日期的转化@NumberFormat,@DataTimeFormat
     xml,json默认读写支持
   -->
   <mvc:annotation-driven/>

   <!--servlet-mapping映射路径-->
   <!--静态资源默认servlet配置
     1、加入对静态资源的处理：js，css，img
     2、允许使用/做整体映射
   -->
   <mvc:default-servlet-handler/>

   <!--配置jsp显示viewResolver-->
   <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
     <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
     <property name="prefix" value="/WEB-INF/jsp/"/>
     <property name="suffix" value=".jsp"/>
   </bean>

   <!--扫描web相关的bean-->
   <conext:component-scan base-package="org.seckill.web"/>

</beans>

  /**
   * 秒杀详情页
   * 
   * @param seckillId
   * @param model
   * @return
   */
  @RequestMapping(value = "/{seckillId}/detail", method = RequestMethod.GET)
  public String detail(@PathVariable("seckillId") Long seckillId, Model model) {
    if (seckillId == null) {
      return "redirect:/seckill/list";
    }
    Seckill seckill = seckillService.getById(seckillId);
    if (seckill == null) {
      return "forward:/seckill/list";
    }
    model.addAttribute("seckill", seckill);
    return "detail";
  }

@RequestMapping(value = "/{seckillId}/exposer", 
      method = RequestMethod.POST, 
      produces = {"application/json;charset=utf-8" })
  @ResponseBody
  public SeckillResult<Exposer> exposer(@PathVariable Long seckillId) {
    SeckillResult<Exposer> result;
    try {
      Exposer exposer = seckillService.exportSeckillUrl(seckillId);
      result = new SeckillResult<Exposer>(true, exposer);
    } catch (Exception e) {
      logger.error(e.getMessage(), e);
      result = new SeckillResult<Exposer>(false, e.getMessage());
    }

    return result;
  }

$.post(seckill.URL.exposer(seckillId),{},function(result){
      //在回调函数中，执行交互流程
      if(result && result['success']){
        var exposer = result['data'];
        if(exposer['exposed']){
          //开启秒杀
          //获取秒杀地址
          var md5 = exposer['md5'];          
          //绑定一次点击事件，防止连续点击
          var killUrl = seckill.URL.execution(seckillId,md5);
          console.log("秒杀地址："+killUrl);
});         

@RequestMapping(value = “/{seckillId}/exposer” 
public SeckillResult exposer(@PathVariable Long seckillId) 

@RequestMapping(method = RequestMethod.POST, 

return “redirect:/seckill/list”;（发送两次请求，浏览器地址改变） 
return “forward:/seckill/list”;（发送一次请求，浏览器地址不变） 

model.addAttribute(“seckill”, seckill); 

@RequestMapping(value = “/{seckillId}/exposer”, 
method = RequestMethod.POST, 
produces = {“application/json;charset=utf-8” }) 
@ResponseBody 

@RequestMapping(value = "/{seckillId}/{md5}/execution",
      method = RequestMethod.POST,
      produces = {"application/json;charset=UTF-8"})
  @ResponseBody
  public SeckillResult<SeckillExecution> execute(@PathVariable("seckillId") Long seckillId,
                          @PathVariable("md5") String md5,
                          @CookieValue(value = "killPhone", required = false) Long phone) {...}