SpringMVC注解学习
1.导入jre包
2.web.xlm
<?xml version="1.0" encoding="UTF-8"?>
<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" id="WebApp_ID" version="2.5">
<display-name>TestSpringMVC</display-name>
<filter>
<filter-name>characterEncoding</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 按默认加载springmvc.xml的规范， 就不需要在这里配置
默认加载规范：
文件名：servlet-name-servlet=====>springmvc-servlet
路径规范：必须在WEB-INF下
-->
<!-- <init-param>
contextConfigLocation 是DispatcherServlet类中的一个参数
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param> -->
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>
3.在WEB-INF下配置springmvc的xml文件
<?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:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">
<context:component-scan base-package="com.gog"></context:component-scan>
<!-- 处理器映射器 -->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"></bean>
<!-- 处理器适配器 -->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"></bean>
<!-- 配置sprigmvc视图解析器：解析逻辑试图 后台返回逻辑试图：index 视图解析器解析出真正物理视图：前缀+逻辑试图+后缀====/WEB-INF/jsps/index.jsp -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
4.自定义的Controller 这里就不需要在继承或实现类类 ，只需要使用注解来使用、
@Controller
@RequestMapping("my")
public class MyController {
//@RequestMapping(value="/abc.do",method=RequestMethod.POST) POST无法访问，因为在这里是默认GET请求
//@RequestMapping(value="/abc.do",method=RequestMethod.GET)
//@RequestMapping(value="/abc.do")
@RequestMapping("abc")
public String Myhello(){
//
返回一个逻辑视图
return "hello";
}
}
a.在类名前面添加@RequestMapping("/my") 是为了分层思想，自定义根路径 如上面访问Myhello()时就是使用url /my/abc.do
b.在方法名前添加@RequestMapping() 就是访问这个方法所返回的页面路径 有很多中表达方式
@RequestMapping(value="/abc.do",method=RequestMethod.POST) POST无法访问，因为在这里是默认GET请求
@RequestMapping(value="/abc.do",method=RequestMethod.GET)
@RequestMapping(value="/abc.do")
@RequestMapping("abc")
...
c.在定义方法的时候，如果是String类型的方法，return返回的就是逻辑视图
d.在定义方法的 时候，如果是void类型的方法，就是不进行页面跳转，单纯的进行页面测试
