Spring MVC - 多动作控制器示例


以下示例说明如何使用Spring Web MVC框架使用Multi Action Controller。所述 MultiActionController 类有助于与他们的方法的多个网址在单个控制器中分别进行映射。

package com.codingdict;

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 = "com.codingdict.UserController" />
<bean name = "/user/*.htm" class = "com.codingdict.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。

序号 描述
1 在Spring MVC - Hello World章节中解释,在com.codingdict包下创建一个名为TestWeb的项目
2 在com.codingdict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

package com.codingdict;

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 = "com.codingdict.UserController" />
   <bean name = "/user/*.htm"
      class = "com.codingdict.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。

弹簧多动作控制器1

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。

弹簧多动作控制器2