spring-mvc-case

最新推荐文章于 2025-04-02 18:11:04 发布

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最新推荐文章于 2025-04-02 18:11:04 发布

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分类专栏： spring 文章标签： spring mvc

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本文详细介绍了SpringMVC框架的两种配置方式：基于注解和基于XML。通过具体的配置示例和代码片段展示了如何实现控制器的扫描、请求的映射以及视图的解析。

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spring mvc 是当前java比较流行的一种mvc架构，下文主要展示spring mvc 使用的配置。

web.xml 的统一配置(仅展示和spring 配置相关部分)


<!--  Spring context 服务层的配置文件 -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>
        	classpath*:META-INF/spring/*Context.xml,
        	classpath*:META-INF/spring/*-beans.xml
        </param-value>
	</context-param>
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>

	<!-- app servlet -->
	<servlet>
		<servlet-name>AppServlet</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>
				/WEB-INF/ServletConfigs/AppServlet/servlet-context.xml
			</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<!-- 覆盖default servlet的/, springmvc servlet将处理原来处理静态资源的映射 -->
	<servlet-mapping>
		<servlet-name>AppServlet</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>

1、完全基于注解的方案。
servlet-context.xml 配置：



	<!-- 自动搜索@Controller标注的类 -->
	<context:component-scan base-package="org.login.web" >
		<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
		<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service" />
	</context:component-scan>

	<!-- 默认的注解映射的支持 
<mvc:annotation-driven />

           -->
		<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"/>
	<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/>

		<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/views/"/>
		<property name="suffix" value=".jsp"/>
	</bean>
</beans>

controller 注解


@Controller
@RequestMapping("/login")
public class LoginController {
	private final static Logger logger = LoggerFactory.getLogger(LoginController.class);
	@RequestMapping("/guest")
	public String login(HttpServletRequest request,HttpServletResponse response){
		logger.info("hello {}",request);
		request.setAttribute("username", "admin");
		request.setAttribute("password", "123456");
		return "login";
	}

}

以上ok
http://localhost:8080/login/guest

2、基于xml的配置
servlet-context.xml 配置：


 <bean id = "loginHandleRequest" class="org.login.web.LoginHandleRequest"/>
    <bean id = "loginController" class="org.login.web.LoginController"/>
    <bean id = "loginServlet" class="org.login.web.LoginServlet"/>


	<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
	    <property name="urlMap">
	       <map>
	          <entry key="/login/guest" value="loginHandleRequest"/>
	          <entry key="/login/guest2" value="loginController"/>
	          <entry key="/login/guest3" value="loginServlet"/>
	       </map>
	    </property>
	</bean>

	<bean class = "org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter"/>
	<bean class = "org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>
	<bean class = "org.springframework.web.servlet.handler.SimpleServletHandlerAdapter"/>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/views/"/>
		<property name="suffix" value=".jsp"/>
	</bean>

java代码：


/**
 * @author wangxinchun
 */
public class LoginController implements Controller {
	private final static Logger logger = LoggerFactory.getLogger(LoginController.class);
	public ModelAndView handleRequest(HttpServletRequest request,
			HttpServletResponse response) throws Exception {
		logger.info("hello {}", request);
		request.setAttribute("username", "admin");
		request.setAttribute("password", "123456");
		return new ModelAndView("login");
	}
}


/**
 * @author wangxinchun
 */
public class LoginHandleRequest implements HttpRequestHandler {
	private final static Logger logger = LoggerFactory.getLogger(LoginHandleRequest.class);

	public void handleRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		logger.info("hello {}", request);
		request.setAttribute("username", "admin");
		request.setAttribute("password", "123456");
		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
	}
}


/**
 * @author wangxinchun
 */
public class LoginServlet extends GenericServlet {
	private static final long serialVersionUID = 1L;
	private final static Logger logger = LoggerFactory.getLogger(LoginServlet.class);

	@Override
	public void service(ServletRequest request, ServletResponse response)
			throws ServletException, IOException {
		logger.info("hello {}", request);
		request.setAttribute("username", "admin");
		request.setAttribute("password", "123456");
		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
	}
}