20 四月, 2010 (15:28) | J2EE FrameWork, spring3 | 繁体 English 0
作者: H.E. | 您可以转载, 但必须以超链接形式标明文章原始出处和作者信息及版权声明
网址: http://www.javabloger.com/article/spring3-rest-mvc-example.html
最近在Java web 项目中需要采用非常简单的REST框架,Struts2、webwork、JSF 经过一番比较,最后选择了Spring3,理由只有一个 “简单,好用,并满足需要”。很久以前就Rod Johnson大叔说 Spring3 全面支持REST风格的Web服务,"We're really seeing extensive interest and growth in REST, and it will have comprehensive support for RESTful Web services," said Johnson,今天亲自尝试了一下,真有点相识恨晚的感觉,如果在这次项目运用没有太大的问题,将来在其他项目会大量运用。
工作原理如图所示:

*根据HTTP请求的URL,调用相应的DispatcherServlet控制器。
*提供一个视图是作为HTTP响应发送。
页面上最终运行效果,如图所示:

主要代码:
清单1:TopicController
package com.javabloger.springrest.action;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
@Controller
@RequestMapping("/topic") //url映射的名称
public class TopicController {
@RequestMapping(value = "/{id}",method=RequestMethod.GET)
public String helloWorld(
@PathVariable Long id,
HttpServletRequest request,
HttpServletResponse response) {
request.setAttribute("message", "You Input Topci Id is: <b>"+id+"</b>");
return "topic" ; // 对应 /WEB-INF/jsp 目录下的 topic.jsp 文件
}
@RequestMapping(value="/add")
public String test(HttpServletRequest request,
HttpServletResponse response){
System.out.println("Hello www.JavaBloger.com ");
request.setAttribute("message", "Hello JavaBloger ! ,@RequestMapping(value='/add')");
return "topic"; // 对应 /WEB-INF/jsp 目录下的 topic.jsp 文件
}
}
清单2 :UserController
package com.javabloger.springrest.action;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import com.javabloger.springrest.pojo.Users;
@Controller
@RequestMapping("/user")
public class UserController {
@RequestMapping(value="/login")
public String test(HttpServletRequest request,
HttpServletResponse response,Users userinfo){ // 非常方便可以直接在方法里面放入对象
if (userinfo.getUsername().equals("username") &&
userinfo.getPassword().equals("password")
)
{
request.setAttribute("user", userinfo);
return "users/list"; //判断,将跳转不同的页面
}
else{
return "users/loginerr"; //判断,将跳转不同的页面
}
}
}
清单3:web.xml
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
清单4:springmvc-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:p="http://www.springframework.org/schema/p"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
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
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/jdbc
http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd">
<bean
class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
<!– 自动搜索@Controller标注的类 –>
<context:component-scan base-package="com.javabloger.springrest.action" />
<bean
class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
<!– Default ViewResolver –>
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp"></property>
</bean>
<bean id="messageSource"
class="org.springframework.context.support.ResourceBundleMessageSource"
p:basename="i18n/messages" />
</beans>
一些废话:
我 个人非常非常喜欢没有xml配置框架,因为项目一大不仅需要对代码进行维护对xml文件还需要维护相当繁琐,在这个项目中除了采用Spring3的 REST特性,还采用了Apache的dbutils对数据进行操作,传说中的SSH轻量级框架是针对EJB和J2EE而言的轻量级,对于上述这样的框架 SSH还能称得上“轻量级”吗?也许SSH目前成为了标准,但不再是“轻量级J2EE框架”的代名词!
另外,还有一份专门介绍 Spring3 MVC的资料《Spring 3 MVC CodeMash 2009》,请看幻灯片:
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