springMVC

SpringMVC

1.使用注解编写Controller类

       ①每个请求处理参数对应一个URL

              @Controller

              public class BbsForumController{

                     @Autowired

                     private BbsForumService bbsForumService;

                    

                     @RequestMapping(“/listAllBoard.do”)

                     public String listAllBoard(){

                            bbsForumService.getAllBoard();

                            System.out.println(“call listAllBoard method”);

                            return “llistBoard”;

                     }

                     @RequestMapping(“/listBoardTopic.do”)

                     public String listBoardTopic(int topicId){//该处的topicId需要通过url传递

                            bbsForumService.getBoardTopics(topicId);

                            System.out.println(“call listBoardTopic method”);

                            return “listTopic”;

                     }

              }

              注：/listAllBoard.do的url请求将由listAllBoard()方法处理，而/listBoardTopic.do?

topicId=1方法将由listBoardTopic()处理

       ②一个Controller对应一个url，由请求参数决定请求处理方法

              @Controller

              @RequestMapping(“/bbsForum.do”)

              public class BbsForumController{

                     @Autowired

                     private BbsForumService bbsForumService;

                     //如果URL请求中包含“method=listAllBoard”的参数，有本方法进行处理

                     @RequestMapping(params=“method=listAllBoard”)

                     public String listAllBoard(){

                            bbsForumService.getAllBoard();

                            System.out.println(“call listAllBoard method”);

                            return “llistBoard”;

                     }

                     //如果URL请求中包括“method= listBoardTopic”的参数，有本方法进行处理

                     @RequestMapping(params=“method=listBoardTopic”)

                     public String listBoardTopic(int topicId){//该处的topicId需要通过url传递

                            bbsForumService.getBoardTopics(topicId);

                            System.out.println(“call listBoardTopic method”);

                            return “listTopic”;

                     }

              }

       ③让请求处理方法处理特定HTTP请求方法

              @Controller

@RequestMapping("/bbtForum.do") 

public class BbtForumController {

            @RequestMapping(params = "method=createTopic",method = RequestMethod.POST)

            public String createTopic(){

               System.out.println("call createTopic method.");

        return "createTopic";

    }

}

注：只有当/bbtForum.do?method=createTopic请求以post方法提交时，createTopic()方法才会进行处理

2.springMVC配置文件解析：

　　A.web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
  <display-name></display-name>    
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
  <servlet>
      <servlet-name>springMVC</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      <init-param>
          <param-name>contextConfigLocation</param-name>
          <param-value>classpath*:config/spring-servlet.xml</param-value>
      </init-param>
      <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
      <servlet-name>springMVC</servlet-name>
      <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

　　a.DispatcherServlet为控制器，拦截匹配的请求，这里定义为所有的请求，把拦截到的请求依据相应的规则分发到对应的Controller中

　　b.contextConfigLocation加载spring-servlet.xml详细的配置文件

　　c.load-on-startup定义启动顺序

　　B.spring-servlet.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"   
    xmlns:context="http://www.springframework.org/schema/context"   
    xmlns:mvc="http://www.springframework.org/schema/mvc"  
    xmlns:p="http://www.springframework.org/schema/p"  
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    
    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.xsd  
    http://www.springframework.org/schema/mvc   
    http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">  
    
    <!-- 注解驱动 -->
    <mvc:annotation-driven/>
    
    <!-- 扫描controller控制器包，否则DispatcherServlet无法找到相应的controller -->
    <context:component-scan base-package="com.tang.controller.annotation"></context:component-scan>
    <mvc:annotation-driven/>
    <!-- 启动springmvc的注解功能，完成请求和注解pojo的映射 -->
<!--     <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"></bean>
 -->    
    <!-- 另外最好加入DefaultAnnotationHandlerMapping,不然会被xml或其他的映射覆盖 -->
<!--     <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"></bean> 
 -->    
    <!-- 引入多视图控制 -->
   <!--  <bean id="paramMethodResolver" class="org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver">
        <property name="paramName" value="action"></property>
    </bean> -->
    
    <!-- 静态资源访问 -->
   <!--  <mvc:resources location="/img/" mapping="/img/**"/>
    <mvc:resources location="/js/" mapping="/js/**"/> -->
    <!-- 改语句可以访问所有的静态资源 -->
    <mvc:default-servlet-handler /> 
    
    <!-- 视图分解器 -->
    <bean id="viewResolver" 
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"/>
        <property name="suffix" value=".jsp"/>        
    </bean>
    
</beans>