类别: 技术文
**关键词: ** JavaConfig | Spring MVC
原文出处:http://johnathanmarksmith.com/
原文标题为：怎样在Spring-MVC-Web中使用Spring's-Java-Configuration (JavaConfig)
标题在简书打出来有点长……囧
SpringMVC-helloworld
这是一个非常基础的在Spring-MVC中使用JavaConfig来编写helloworld web程序的例子.
第一部分我来为我们的web-app创建一个配置类（configuaration class）。下面这个就是我们即将使用的configuaration class案例：
@Configuration
@EnableWebMvc
@ComponentScan(basePackages = {"com.johnathanmsmith.mvc.web"})
public class WebMVCConfig extends WebMvcConfigurerAdapter
{
private static final Logger logger = LoggerFactory.getLogger(WebMVCConfig.class);
@Bean
public ViewResolver resolver()
{
UrlBasedViewResolver url = new UrlBasedViewResolver();
url.setPrefix("/views/");
url.setViewClass(JstlView.class);
url.setSuffix(".jsp");
return url;
}
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry)
{
logger.debug("setting up resource handlers");
registry.addResourceHandler("/resources/").addResourceLocations("/resources/**");
}
@Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer)
{
logger.debug("configureDefaultServletHandling");
configurer.enable();
}
@Bean
public SimpleMappingExceptionResolver simpleMappingExceptionResolver()
{
SimpleMappingExceptionResolver b = new SimpleMappingExceptionResolver();
Properties mappings = new Properties();
mappings.put("org.springframework.web.servlet.PageNotFound", "p404");
mappings.put("org.springframework.dao.DataAccessException", "dataAccessFailure");
mappings.put("org.springframework.transaction.TransactionException", "dataAccessFailure");
b.setExceptionMappings(mappings);
return b;
}
}
接下来，你需要设置web.xml文件来使用上面的配置类，当然我们还需要来为contectConfigLocation属性设置配置类所在的包（路径）。设置如下：
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5">
<servlet>
<servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextClass</param-name>
<param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext</param-value>
</init-param>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>com.johnathanmsmith.mvc.web.config, com.johnathanmsmith.mvc.web.controller</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
好的，下面我们设置一个基础控制器来展示下页面看看：
@Controller
@RequestMapping("/ask")
class IndexController
{
private static final Logger logger = LoggerFactory.getLogger(IndexController.class);
@RequestMapping(method = RequestMethod.GET)
public String displayRequestPage()
{
/*
I am going to display the helloworld.jsp page now :)
*/
logger.debug("made it to controller");
return "helloworld";
}
}
好的，到这里就全部就绪了...
获取这个项目并运行
要获得这个项目并运行它的话，你需要按照下面的步骤进行：
git clone git@github.com:JohnathanMarkSmith/springmvc-helloworld.git
cd springmvc-helloworld/
mvn tomcat7:run
在此之后你就可以打开浏览器然后输入地址：http://127.0.0.1:8080/springmvc-helloworld/
嗯，运行起来就是这样了。
这里有我所做的视频(视频地址即原文地址)
如果你有任何问题或者建议可以给我john@johnathanmarksmith.com发邮件
欢迎指正译文错误，不胜感激！
