搭建环境

1.导Jar包



2.配置前端控制器（web.xml）

<?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>Spring_mvc</display-name>

<!-- springmvc前端控制器 -->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<!-- 指定加载的springmvc框架配置文件
默认命名方式：servlet的name+'-servlet.xml'，即springmvc-servlet.xml，此文件默认在/WEB-INF/下
-->
<param-value>classpath:springmvc.xml</param-value>
</init-param>

</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.action</url-pattern>
</servlet-mapping>

<!-- post乱码过虑器 -->
<filter>
<filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-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.配置处理器映射器（springmvc.xml）

<!--
将bean的name当成action的url
-->
<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>

4、配置处理器适配置器
<!-- 处理器适配置器
凡时实现controller接口的类都当成SimpleControllerHandlerAdapter执行的对象
-->
<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>

5、编写handler即后端控制器

public class HelloWorld implements Controller {
@Override
public ModelAndView handleRequest(HttpServletRequest request,
HttpServletResponse response) throws Exception {

ModelAndView modelAndView = new ModelAndView();
String message = "hello world!!!";
modelAndView.addObject("message", message);
modelAndView.setViewName("helloworld");
return modelAndView;
}
}

7、配置视图解析器

在springmvc.xml中配置

<!-- 视图解析
解析jsp视图，默认支持jstl标签
-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
</bean>

8、编写action并配置

<!-- hello World的action
这个action的url通过name配置，url为hello.action
-->
<bean name="/hello.action" class="cn.springmvc.action.HelloWorld"/>