vaadin的spring 整合的例子

 

/*
3	* Copyright (C) 2010 Archie L. Cobbs. All rights reserved.
4	*
5	* $Id: AutowiringApplicationServlet.java 19 2010-02-04 18:09:30Z archie $
6	*/
7
8	package com.example;
9
10	import com.vaadin.Application;
11	import com.vaadin.terminal.gwt.server.ApplicationServlet;
12
13	import javax.servlet.ServletConfig;
14	import javax.servlet.ServletException;
15	import javax.servlet.http.HttpServletRequest;
16
17	import org.springframework.beans.BeansException;
18	import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
19	import org.springframework.web.context.WebApplicationContext;
20	import org.springframework.web.context.support.WebApplicationContextUtils;
21
22	/**
23	* {@link ApplicationServlet} that autowires and configures the {@link Application}
24	* objects it creates using the associated Spring {@link WebApplicationContext}.
25	* This allows a Vaadin application to be configured normally as a Spring bean.
26	*
27	*
28	* For example, annotations such as
29	* {@link org.springframework.beans.factory.annotation.Autowired @Autowired},
30	* {@link org.springframework.beans.factory.annotation.Required @Required}, etc.
31	* and interfaces such as {@link org.springframework.beans.factory.BeanFactoryAware BeanFactoryAware},
32	* etc. will work on your {@link Application} instances.
33	*
34	*
35	*
36	* An example of "direct" use of this servlet in conjunction with Spring's
37	* {@link org.springframework.web.context.ContextLoaderListener ContextLoaderListener}:
38	*
39	*  <!-- Spring context loader -->
40	*  <listener>
41	*      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
42	*  </listener>
43	*
44	*  <!-- Vaadin servlet -->
45	*  <servlet>
46	*      <servlet-name>myapp</servlet-name>
47	*      <servlet-class>com.example.AutowiringApplicationServlet</servlet-class>
48	*      <init-param>
49	*          <param-name>application</param-name>
50	*          <param-value>some.spring.configured.Application</param-value>
51	*      </init-param>
52	*      <init-param>
53	*          <param-name>productionMode</param-name>
54	*          <param-value>true</param-value>
55	*      </init-param>
56	*  </servlet>
57	*  <servlet-mapping>
58	*      <servlet-name>myapp</servlet-name>
59	*      <url-pattern>/*</url-pattern>
60	*  </servlet-mapping>
61	*
62	*
63	*
64	*
65	* An example that creates a Spring MVC "controller" bean for use with Spring's
66	* {@link org.springframework.web.servlet.DispatcherServlet DispatcherServlet}:
67	*
68	*  <!-- Activate Spring annotation support -->
69	*  <context:annotation-config/>
70	*
71	*  <!-- Define controller bean for Vaadin application -->
72	*  <bean id="applicationController" class="org.springframework.web.servlet.mvc.ServletWrappingController"
73	*     p:servletClass="com.example.AutowiringApplicationServlet">
74	*      <property name="initParameters">
75	*          <props>
76	*              <prop key="application">some.spring.configured.Application</prop>
77	*              <prop key="productionMode">true</prop>
78	*          </props>
79	*      </property>
80	*  </bean>
81	*
82	*
83	* @see org.springframework.web.servlet.mvc.ContextLoaderListener
84	* @see org.springframework.web.servlet.DispatcherServlet
85	* @see org.springframework.web.servlet.mvc.ServletWrappingController
86	* @see AutowireCapableBeanFactory
87	*/
88	public class AutowiringApplicationServlet extends ApplicationServlet {
89
90	private WebApplicationContext webApplicationContext;
91
92	/**
93	* Initialize this servlet.
94	*
95	* @throws ServletException if there is no {@link WebApplicationContext} associated with this servlet's context
96	*/
97	@Override
98	public void init(ServletConfig config) throws ServletException {
99	super.init(config);
100	try {
101	this.webApplicationContext = WebApplicationContextUtils.getRequiredWebApplicationContext(config.getServletContext());
102	} catch (IllegalStateException e) {
103	throw new ServletException("could not locate containing WebApplicationContext");
104	}
105	}
106
107	/**
108	* Get the containing Spring {@link WebApplicationContext}.
109	* This only works after the servlet has been initialized (via {@link #init init()}).
110	*
111	* @throws ServletException if the operation fails
112	*/
113	protected final WebApplicationContext getWebApplicationContext() throws ServletException {
114	if (this.webApplicationContext == null)
115	throw new ServletException("can't retrieve WebApplicationContext before init() is invoked");
116	return this.webApplicationContext;
117	}
118
119	/**
120	* Get the {@link AutowireCapableBeanFactory} associated with the containing Spring {@link WebApplicationContext}.
121	* This only works after the servlet has been initialized (via {@link #init init()}).
122	*
123	* @throws ServletException if the operation fails
124	*/
125	protected final AutowireCapableBeanFactory getAutowireCapableBeanFactory() throws ServletException {
126	try {
127	return getWebApplicationContext().getAutowireCapableBeanFactory();
128	} catch (IllegalStateException e) {
129	throw new ServletException("containing context " + getWebApplicationContext() + " is not autowire-capable", e);
130	}
131	}
132
133	/**
134	* Create and configure a new instance of the configured application class.
135	*
136	*
137	* The implementation in {@link AutowiringApplicationServlet} delegates to
138	* {@link #getAutowireCapableBeanFactory getAutowireCapableBeanFactory()}, then invokes
139	* {@link AutowireCapableBeanFactory#createBean AutowireCapableBeanFactory.createBean()}
140	* using the configured {@link Application} class.
141	*
142	*
143	* @param request the triggering {@link HttpServletRequest}
144	* @throws ServletException if creation or autowiring fails
145	*/
146	@Override
147	protected Application getNewApplication(HttpServletRequest request) throws ServletException {
148	Class extends Application> cl = getApplicationClass();
149	AutowireCapableBeanFactory beanFactory = getAutowireCapableBeanFactory();
150	try {
151	return beanFactory.createBean(cl);
152	} catch (BeansException e) {
153	throw new ServletException("failed to create new instance of " + cl, e);
154	}
155	}
156	}