以下範例顯示如何使用Spring Web MVC框架來實現一個簡單URL處理程式對映。 SimpleUrlHandlerMapping
類分別顯式地將URL
對映到相應的控制器上。
所下所示組態 -
<beans>
<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.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="/welcome.html">welcomeController</prop>
<prop key="/helloWorld.html">helloController</prop>
</props>
</property>
</bean>
<bean id="helloController" class="com.yiibai.springmvc.HelloController" />
<bean id="welcomeController" class="com.yiibai.springmvc.WelcomeController"/>
</beans>
例如,使用上面的組態,如果URI:
/helloWorld.html
請求,DispatcherServlet
將請求轉發到HelloController
類。/welcome.html
,DispatcherServlet
會將請求轉發給WelcomeController
類。首先,讓我們使用Eclipse IDE,並按照以下步驟使用Spring Web Framework開發基於動態表單的Web應用程式:
com.yiibai.springmvc
包下建立兩個Java類HelloController
和 WelcomeController
。jsp
子檔案夾下建立兩個檢視檔案:hello.jsp
和 welcome.jsp
。完整的專案檔案目錄結構如下所示 -
HelloController.java 的程式碼如下所示 -
package com.yiibai.springmvc;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;
public class HelloController extends AbstractController{
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request,
HttpServletResponse response) throws Exception {
ModelAndView model = new ModelAndView("hello");
model.addObject("message", "Hello World!");
return model;
}
}
WelcomeController.java 的程式碼如下所示 -
package com.yiibai.springmvc;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;
public class WelcomeController extends AbstractController{
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request,
HttpServletResponse response) throws Exception {
ModelAndView model = new ModelAndView("welcome");
model.addObject("message", "Welcome!");
return model;
}
}
SimpleUrlHandlerMapping-servlet.xml 的程式碼如下所示 -
<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.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="/welcome.html">welcomeController</prop>
<prop key="/helloWorld.html">helloController</prop>
</props>
</property>
</bean>
<bean id="helloController" class="com.yiibai.springmvc.HelloController" />
<bean id="welcomeController" class="com.yiibai.springmvc.WelcomeController"/>
</beans>
hello.jsp 的程式碼如下所示 -
<%@ page contentType="text/html; charset=UTF-8" %>
<html>
<head>
<title>Hello World</title>
</head>
<body>
<h2>${message}</h2>
</body>
</html>
welcome.jsp 的程式碼如下所示 -
<%@ page contentType="text/html; charset=UTF-8" %>
<html>
<head>
<title>Welcome</title>
</head>
<body>
<h2>${message}</h2>
</body>
</html>
完成建立源和組態檔案後,發布應用程式到Tomcat伺服器。
現在啟動Tomcat伺服器,現在嘗試存取URL => http://localhost:8080/SimpleUrlHandlerMapping/helloWorld.html ,如果Spring Web應用程式沒有問題,應該看到以下結果:
當存取URL => http://localhost:8080/SimpleUrlHandlerMapping/welcome.html , 如果Spring Web應用程式沒有問題,應該看到以下結果: