Multi Action Controller

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2023-12-01

以下示例说明如何使用Spring Web MVC框架使用Multi Action Controller。 MultiActionController类有助于分别在单个控制器中使用其方法映射多个URL。

package cn.xnip;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;
public class UserController extends MultiActionController{
   public ModelAndView home(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("home");
      model.addObject("message", "Home");
      return model;
   }
   public ModelAndView add(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "Add");
      return model;
   }
   public ModelAndView remove(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "Remove");
      return model;
   }
}

<bean class = "org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
<bean name = "/home.htm" class = "cn.xnip.UserController" /> 
<bean name = "/user/*.htm" class = "cn.xnip.UserController" />

例如，使用上面的配置，如果URI -

请求/home.htm，DispatcherServlet会将请求转发给UserController home()方法。
请求user/add.htm，DispatcherServlet会将请求转发给UserController的add()方法。
请求user/remove.htm，DispatcherServlet会将请求转发给UserController的remove()方法。

首先，让我们使用一个可用的Eclipse IDE，并坚持以下步骤，使用Spring Web Framework开发基于动态表单的Web应用程序。

步	描述
1	在Spring MVC - Hello World章节中解释，在cn.xnip包下创建一个名为TestWeb的项目。
2	在cn.xnip包下创建一个Java类UserController。
3	在jsp子文件夹下创建视图文件home.jsp和user.jsp。
4	最后一步是创建源文件和配置文件的内容并导出应用程序，如下所述。

UserController.java)/h2>

package cn.xnip;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;
public class UserController extends MultiActionController{
   public ModelAndView home(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("home");
      model.addObject("message", "Home");
      return model;
   }
   public ModelAndView add(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "Add");
      return model;
   }
   public ModelAndView remove(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "Remove");
      return model;
   }
}

TestWeb-servlet.xml

<beans xmlns = "http://www.springframework.org/schema/beans"
   xmlns:context = "http://www.springframework.org/schema/context"
   xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation = "
   http://www.springframework.org/schema/beans     
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
   http://www.springframework.org/schema/context 
   http://www.springframework.org/schema/context/spring-context-3.0.xsd">
   <bean class = "org.springframework.web.servlet.view.InternalResourceViewResolver">
      <property name = "prefix" value = "/WEB-INF/jsp/"/>
      <property name = "suffix" value = ".jsp"/>
   </bean>
   <bean class = "org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
   <bean name = "/home.htm" 
      class = "cn.xnip.UserController" /> 
   <bean name = "/user/*.htm" 
      class = "cn.xnip.UserController" />    
</beans>

home.jsp

<%@ page contentType = "text/html; charset = UTF-8" %>
<html>
   <head>
      <meta http-equiv = "Content-Type" content = "text/html; charset = ISO-8859-1">
      <title>Home</title>
   </head>
   <body>
      <a href = "user/add.htm" >Add</a> <br>
      <a href = "user/remove.htm" >Remove</a>
   </body>
</html>

user.jsp

<%@ page contentType = "text/html; charset = UTF-8" %>
<html>
   <head>
      <title>Hello World</title>
   </head>
   <body>
      <h2>${message}</h2>  
   </body>
</html>

完成创建源文件和配置文件后，导出应用程序。右键单击您的应用程序，使用Export → WAR File选项并将TestWeb.war文件保存在Tomcat的webapps文件夹中。

现在，启动Tomcat服务器并确保您可以使用标准浏览器从webapps文件夹访问其他网页。现在，尝试一个URL - http://localhost:8080/TestWeb/home.htm ，如果Spring Web Application的一切正常，我们将看到以下屏幕。

尝试URL http://localhost:8080/TestWeb/user/add.htm ，如果Spring Web Application的一切正常，我们将看到以下屏幕。