这里使用 DWR3.rc1, Spring2.5 and Spring MVC

在Spring2.5中，使用了许多annotation, 新版本的DWR也支持annotation了, 下面看一下配置过程

1. 先写一个Controller

Java代码

1. package com.myapp.web.controller;
2. import javax.servlet.http.HttpServletRequest;
3. import org.directwebremoting.annotations.RemoteMethod;
4. import org.directwebremoting.annotations.RemoteProxy;
5. import org.springframework.stereotype.Controller;
6. import org.springframework.web.bind.annotation.RequestMapping;
7. @Controller
8. @RemoteProxy
9. public class UserController {
10. @RemoteMethod
11. public String getUserName(int id) {
12. System.out.println("user id is " + id);
13. return "UserName: " + id;
14. }
15. @RequestMapping("/user/add.do")
16. public String addUser(HttpServletRequest request) {
17. System.out.println("this is action method");
18. return "/user/list.jsp";
19. }
20. }

package com.myapp.web.controller; import javax.servlet.http.HttpServletRequest; import org.directwebremoting.annotations.RemoteMethod; import org.directwebremoting.annotations.RemoteProxy; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; @Controller @RemoteProxy public class UserController { @RemoteMethod public String getUserName(int id) { System.out.println("user id is " + id); return "UserName: " + id; } @RequestMapping("/user/add.do") public String addUser(HttpServletRequest request) { System.out.println("this is action method"); return "/user/list.jsp"; } }

@RemoteProxy注解告诉DWR，这个Class是我们想暴露出来的。@RemoteMethod注解告诉DWR去暴露这个指定的方法，只有加了RemoteMethod注解的方法会被暴露，其它的不会。

这里也可以使用@RemoteProxy(name="userRemote")的方式指定DWR接口的名字

2. 接下来看web.xml的配置

Xml代码

1. <servlet>
2. <servlet-name>action</servlet-name>
3. <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
4. <load-on-startup>1</load-on-startup>
5. </servlet>
6. <context-param>
7. <param-name>contextConfigLocation</param-name>
8. <param-value>/WEB-INF/springconfig/*.xml</param-value>
9. </context-param>
10. <servlet-mapping>
11. <servlet-name>action</servlet-name>
12. <url-pattern>*.do</url-pattern>
13. </servlet-mapping>
14. <servlet-mapping>
15. <servlet-name>action</servlet-name>
16. <url-pattern>/dwr/*</url-pattern>
17. </servlet-mapping>
18. <listener>
19. <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
20. </listener>

 <servlet> <servlet-name>action</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/springconfig/*.xml</param-value> </context-param> <servlet-mapping> <servlet-name>action</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>action</servlet-name> <url-pattern>/dwr/*</url-pattern> </servlet-mapping> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener>

注意，这里没有使用org.directwebremoting.spring.DwrSpringServlet或org.directwebremoting.servlet.DwrServlet，并且请注意这里使用spring的dispatcher servlet来映射/dwr/*请求。

3. 最后看针对DispatcherServlet的配置文件action-servlet.xml

Xml代码

1. <beans xmlns="http://www.springframework.org/schema/beans"
2. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
3. xmlns:dwr="http://www.directwebremoting.org/schema/spring-dwr"
4. xmlns:context="http://www.springframework.org/schema/context"
5. xsi:schemaLocation="http://www.springframework.org/schema/beans
6. http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
7. http://www.springframework.org/schema/context
8. http://www.springframework.org/schema/context/spring-context-2.5.xsd
9. http://www.directwebremoting.org/schema/spring-dwr
10. http://www.directwebremoting.org/schema/spring-dwr-3.0.xsd"
11. default-autowire="byName">
12. <context:annotation-config />
13. <!-- 注意这里新增加的dwr tag, 为使其生效，文件头中要声明namespace -->
14. <dwr:configuration />
15. <dwr:annotation-config />
16. <dwr:url-mapping />
17. <!-- 部署项目时, 请把debug设为false -->
18. <dwr:controller id="dwrController" debug="true" />
19. <!-- 多个包名用逗号隔开, 但不能有空格 -->
20. <context:component-scan base-package="com.myapp.web.controller" />
21. <!-- order值越小, 优先级越高 -->
22. <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping">
23. <property name="order" value="1" />
24. </bean>
25. <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping">
26. <property name="order" value="2" />
27. </bean>
28. </beans>

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dwr="http://www.directwebremoting.org/schema/spring-dwr" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.directwebremoting.org/schema/spring-dwr http://www.directwebremoting.org/schema/spring-dwr-3.0.xsd" default-autowire="byName"> <context:annotation-config /> <!-- 注意这里新增加的dwr tag, 为使其生效，文件头中要声明namespace --> <dwr:configuration /> <dwr:annotation-config /> <dwr:url-mapping /> <!-- 部署项目时, 请把debug设为false --> <dwr:controller id="dwrController" debug="true" /> <!-- 多个包名用逗号隔开, 但不能有空格 --> <context:component-scan base-package="com.myapp.web.controller" /> <!-- order值越小, 优先级越高 --> <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"> <property name="order" value="1" /> </bean> <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"> <property name="order" value="2" /> </bean> </beans>

简单解释一下这些配置

• <dwr:annotation-config /> 要求DWR在Spring容器中检查拥有@RemoteProxy 和 @RemoteMethod注解的类。注意它不会去检查Spring容器之外的类。
• <dwr:url-mapping /> 要求DWR将util.js和engine.js映射到dwrController
• <dwr:controller id="dwrController" debug="true" /> 定义dwrController
• <dwr:configuration /> 此标签在这个例子中不是必须的，如果你想配置Spring容器之外的类，就需要它了。

最后一件事，DWR的测试页面 http://localhost:8080/myapp/dwr 在这里不好用。

请使用 http://localhost:8080/myapp/dwr/test/YOUR-BEAN-NAME 的方式来测试你的DWR接口，

例如这里使用 http://localhost:8080/myapp/dwr/test/UserController

OK 运行测试一下吧