unit03_01
unit03_02
springmvc流程图
案例：hello示例
/hello.do --> springmvc --> /WEB-INF/hello.jsp
/hello.do
--> DispatcherServlet
-->HandlerMapping
-->HelloController
-->ViewResolver
-->hello.jsp
a。搭建Spring Web MVC开发环境
--引入ioc，webmvc开发包
--src下添加applicationContext.xml
b。编写HelloController
2.显示登录页面
/tologin.do
-->DispatcherServlet
-->handlermapping
-->ToLoginController
-->ViewResolver
-->/WEB-INF/login.jsp
3.单机登陆按钮处理
/login.do(提交表单)
-->DispatcherServlet
-->handlermapping
-->LoginController(获取提交的用户名和密码，如果用户名为root，密码为1234，正确)
-->ViewResolver
-->错误进入/WEB-INF/login.jsp。正确进入/WEB-INF/ok.jsp
完整代码：
spring 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:util="http://www.springframework.org/schema/util"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<!-- 配置handlermapping -->
<bean id="handlermapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<!-- 指定请求和controller对应关系 -->
<property name="mappings">
<props>
<prop key="/hello.do">helloController</prop>
<prop key="/tologin.do">tologinController</prop>
<prop key="/login.do">loginController</prop>
</props>
</property>
</bean>
<!-- 配置controller -->
<bean id="helloController" class="org.alexhe.controller.HelloController"></bean>
<bean id="tologinController" class="org.alexhe.controller.ToLoginController"></bean>
<bean id="loginController" class="org.alexhe.controller.LoginController"></bean>
<!-- 配置ViewResolver -->
<bean id="viewresolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1">
<display-name>dnspringmvc1</display-name>
<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:applicationContext.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>
<servlet>
<description>JAX-RS Tools Generated - Do not modify</description>
<servlet-name>JAX-RS Servlet</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>JAX-RS Servlet</servlet-name>
<url-pattern>/jaxrs/*</url-pattern>
</servlet-mapping>
</web-app>
HelloController.java:
package org.alexhe.controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
public class HelloController implements Controller{
@Override
public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
ModelAndView mav=new ModelAndView();
mav.setViewName("hello");//设置视图名字，也就是hello.jsp 从spring的xml里prefix，suffix加上
mav.getModel().put("msg", "模型数据");//等价于request.setAttribute("msg","data");
return mav;
}
}
ToLoginController.java:
package org.alexhe.controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
public class ToLoginController implements Controller{
@Override
public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
ModelAndView mav=new ModelAndView();
mav.setViewName("login");//设置视图名字，也就是hello.jsp 从spring的xml里prefix，suffix加上
return mav;
}
}
LoginController.java:
package org.alexhe.controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
public class LoginController implements Controller{
@Override
public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
ModelAndView mav=new ModelAndView();
String username=request.getParameter("username");
String password=request.getParameter("password");
if("root".equals(username)&&"1234".equals(password)){
mav.setViewName("ok");//设置视图名字，也就是hello.jsp 从spring的xml里prefix，suffix加上
}else{
mav.setViewName("login");
}
return mav;
}
}
login.jsp:
<form action="login.do" method="post">
用户名:<input type="text" name="username"><br>
密码:<input type="password" name="password"><br>
<input type="submit" value="登陆">
</form>
ok.jsp:略
hello.jsp：略