Spring MVC - 参数方法名称解析器示例



以下示例演示了如何使用 Spring Web MVC 框架中多动作控制器的参数方法名称解析器。MultiActionController 类有助于将多个 URL 分别映射到单个控制器中的其方法。

package com.tutorialspoint;

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("user");
      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 = "com.tutorialspoint.UserController">
   <property name = "methodNameResolver">
      <bean class = "org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver">
         <property name = "paramName" value = "action"/>
      </bean>
   </property>
</bean>

例如,使用上述配置,如果请求 URI 为:

  • /user/*.htm?action=home,DispatcherServlet 将请求转发到 UserController 的home() 方法。

  • /user/*.htm?action=add,DispatcherServlet 将请求转发到 UserController 的add() 方法。

  • /user/*.htm?action=remove,DispatcherServlet 将请求转发到 UserController 的remove() 方法。

首先,让我们准备好一个可用的 Eclipse IDE,并按照以下步骤使用 Spring Web 框架开发基于动态表单的 Web 应用程序。

步骤 描述
1 在 Spring MVC - Hello World 章节中说明的基础上,创建一个名为 TestWeb 的项目,其包名为 com.tutorialspoint。
2 在 com.tutorialspoint 包下创建一个名为 UserController 的 Java 类。
3 在 jsp 子文件夹下创建一个名为 user.jsp 的视图文件。
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.tutorialspoint;

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("user");
      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.mvc.support.ControllerClassNameHandlerMapping"> 
      <property name = "caseSensitive" value = "true" />
   </bean>
   <bean class = "com.tutorialspoint.UserController">
      <property name = "methodNameResolver">
         <bean class = "org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver">
            <property name = "paramName" value = "action"/>
         </bean>
      </property>
   </bean>
</beans>

user.jsp

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

创建完源文件和配置文件后,导出您的应用程序。右键单击您的应用程序,使用导出 → WAR 文件选项并将TestWeb.war文件保存到 Tomcat 的 webapps 文件夹中。

现在,启动您的 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 URL:https://127.0.0.1:8080/TestWeb/user/test.htm?action=home,如果 Spring Web 应用程序一切正常,您将看到以下屏幕。

Spring Multi Action Controller
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