springday03-go2

新建springmvc01项目
1.创建项目，导入jar包
拷贝jar/spring/first下的五个spring的jar包，以及jar/spring/mvc下的两个mvcjar包放在lib下

2.创建Spring MVC配置文件
复制xml到src下，并将ApplicationContext.xml名字改为spring-mvc.xml

3.在web.xml中配置DispatcherServlet
在web.xml中配置DispatcherServlet,直接复制PPT上面的相关代码即可,注意，web.xml中通过DisPatcherservlet 的初始化方法启动了spring容器。之前我们在测试方法中总是要去写
启动容器代码，现在不需要了。这里的代码只要写一次。

4.创建Controller
在controller包下新建HelloController类，要求实现Controller接口，返回的是一个ModelAndView

5.配置Controller
a.声明Controller b.定义请求处理映射HandlerMapping c.定义视图解析器ViewResolver

6.创建页面
在WEB-INF下新建一个文件hello.jsp

8.部署-》启动Tomcat-》访问http://localhost：8088/springmvc/hello.do,则会输出JSP中的内容

注意：很容易出现500错误，一定是xml配置文件路径有问题，注意检查路径！

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
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_2_5.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:spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>

HelloController.java:

package controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

//二级控制器：处理业务逻辑
//要求实现Controller接口,只能处理一个请求。

public class HelloController implements Controller{

public ModelAndView handleRequest(
HttpServletRequest req,HttpServletResponse res)
throws Exception {
System.out.println("helloController处理请求");
//hello是视图名，ViewResolver会将视图名解析成真正的页面的名称，
//比如解析成hello.jsp
return new ModelAndView("hello");
}

}

 spring-mvc.xml:

<?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:context="http://www.springframework.org/schema/context"
xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-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/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-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/util http://www.springframework.org/schema/util/spring-util-3.2.xsd">

<bean id="helloController" class="controller.HelloController"/>

<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="/hello.do">helloController</prop>
</props>
</property>
</bean>

<!-- 这样，视图名hello通过以下配置可以映射到/WEB-INF/hello.jsp -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>

WebRoot/WEB-INF/hello.jsp:

<h1>Hello,SpringMVC!</h1>

结果：输入http://localhost:8088/springmvc01/hello.do：

要求熟练掌握这个流程思想！