SpringMVC
1.介绍
MVC思想：专事专干
SpringMVC：spring对MVC思想的实现（请求：Controller；视图：视图引擎；数据：Model）
2.前端控制器
统一的入口，并将请求进行分发
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app 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"
version="3.0">
<!-- Spring MVC 前端控制器-->
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 指定 Spring 容器启动加载的配置文件-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:mvc.xml</param-value>
</init-param>
<!-- Tomcat 启动初始化 -->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- 字符编码-->
<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>
</web-app>
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:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.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.xsd">
<!-- IoC,DI注解解析器 只有Controller版式便签才能够创建对象-->
<context:component-scan base-package="cn.wolfcode.web"/>
<!-- JSON注解-->
<mvc:annotation-driven/>
<!-- 静态资源-->
<mvc:default-servlet-handler/>
<!-- 引入配置文件-->
<import resource="classpath:applicationContext.xml"/>
</beans>
3.前端控制器路径
/*.do,不符合RESTful风格
/
/*
4.处理响应
4.1.HTML
@RequestMapping("/list")
public String list(Model model, QueryObject queryObject){
PageResult<Department> pageResult = departmentService.query(queryObject);
model.addAttribute("pageResult",pageResult);
return "department/list";
//List<Department> departments=departmentService.listAll();
//model.addAttribute("departments",departments);
//return "department/list";
}
mvc.xml配置便利寻找视图
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/"/>
<property name="suffix" value=".jsp"/>
</bean>
4.2.转发和重定向
| 地址栏 | WEB-INF | 共享请求路径 | 表单重复提交 | |
|---|---|---|---|---|
| 转发 | 不变 | 可以访问 | 共享 | 有 |
| 定向 | 变 | 不可以访问 | 不共享 | 无 |
注意
4.3.处理时间参数
/** 预约时间*/
@DateTimeFormat(pattern = "yyyy-MM-dd")
private Date appointmentTime;
4.4.文件上传
web.xml限制大小
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
<multipart-config>
<max-file-size>52428800</max-file-size>
<max-request-size>52428800</max-request-size>
</multipart-config>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- 字符编码-->
<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>
mvc.xml
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!--最大上传文件大小 10M -->
<property name="maxUploadSize" value="#{1024*1024*10}"/>
</bean>
4.5.拦截器
需要实现HandlerInterceptor
public class CheckLoginInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//if(request.getSession().getAttribute("EMPLOYEE_IN_SESSION")!=null){
// return true;
//}
if(UserContext.getEmployee()!=null){
return true;
}
response.sendRedirect("/static/login.html");
return false;
}
}
mvc.xml
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**"/>
<mvc:exclude-mapping path="/static/**"/>
<mvc:exclude-mapping path="/login**"/>
<mvc:exclude-mapping path="/index/**"/>
<mvc:exclude-mapping path="/list"/>
<mvc:exclude-mapping path="/save"/>
<mvc:exclude-mapping path="/listItem**"/>
<mvc:exclude-mapping path="/systemDictionary/queryById"/>
<bean class="cn.wolfcode.web.interceptor.CheckLoginInterceptor"></bean>
</mvc:interceptor>
<mvc:interceptor>
<mvc:mapping path="/**"/>
<mvc:exclude-mapping path="/static/**"/>
<mvc:exclude-mapping path="/login**"/>
<mvc:exclude-mapping path="/index/**"/>
<mvc:exclude-mapping path="/list"/>
<mvc:exclude-mapping path="/save"/>
<mvc:exclude-mapping path="/listItem**"/>
<mvc:exclude-mapping path="/systemDictionary/queryById"/>
<bean class="cn.wolfcode.web.interceptor.CheckPermissionInterceptor"></bean>
</mvc:interceptor>
</mvc:interceptors>
