Spring In Action Spring MVC

Spring MVC 的核心是DispatherServlet，DispatherServlet将请求发送给控制器，处理器映射根据请求URL进行决策。

image.png

DispatherServlet必须在web.xml文件中配置。

<?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_3_0.xsd"
    version="3.0">
    
    <display-name>wi11iamWechat</display-name>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:spring-*.xml</param-value>
    </context-param>
    <listener>
        <description>spring监听器</description>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <listener>
        <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
    </listener>
    
    <filter>
        <description>防止XXS和SQL等攻击</description>
        <filter-name>defenseAttackFilter</filter-name>
        <filter-class> com.wi11iam.utils.DefenseAttackFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>defenseAttackFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
    <filter>
        <description>字符集过滤器</description>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <description>字符集编码</description>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
    <servlet>
        <description>spring mvc servlet</description>
        <servlet-name>springMvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <description>spring mvc 配置文件</description>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springMVC.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springMvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    
    <filter>
        <filter-name>sitemesh3</filter-name>
        <filter-class>org.sitemesh.config.ConfigurableSiteMeshFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>sitemesh3</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <welcome-file-list>
        <welcome-file>/</welcome-file>
    </welcome-file-list>
<!--    <error-page>
        <error-code>404</error-code>
        <location>/WEB-INF/views/error/404.jsp</location>
    </error-page>
    <error-page>
        <error-code>500</error-code>
        <location>/WEB-INF/views/error/404.jsp</location>
    </error-page> -->
</web-app>

web.xml详解
tomcat 加载顺序

<servlet>
        <description>spring mvc servlet</description>
        <servlet-name>springMvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <description>spring mvc 配置文件</description>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springMVC.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
</servlet>

tomcat 启动先加载web.xml 在web.xml 找到DispatherServlet加载 spring MVC的配置文件加载

<listener>
        <description>spring监听器</description>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

ContextLoaderListener加载其他的context-param中的配置文件

<servlet-mapping>
        <servlet-name>springMvc</servlet-name>
        <url-pattern>/</url-pattern>
</servlet-mapping>

将所有的url请求都拦截到DispatherServlet处理（包括静态资源css img 文件）

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="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 
http://www.springframework.org/schema/mvc 
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">

    <!-- 自动扫描controller包下的所有类，使其认为spring mvc的控制器 -->
    <context:component-scan base-package="com.wi11iam.wechat.controller" />

    <mvc:annotation-driven />

    <mvc:resources mapping="/css/**" location="/css/" />
    <mvc:resources mapping="/images/**" location="/images/" />
    <mvc:resources mapping="/js/**" location="/js/" />
    <mvc:resources mapping="/MP_verify_YPbgNxZ8JlmnNEqq.txt" location="/mp/" />

    <mvc:interceptors>
        <!-- 使用bean定义一个Interceptor，直接定义在mvc:interceptors根下面的Interceptor将拦截所有的请求 -->
        <mvc:interceptor>
            <mvc:mapping path="/account/**" />
            <mvc:mapping path="/invest/**" />
            <mvc:mapping path="/pay/**" />
            <mvc:mapping path="/loginAndRegister/index" />
            <mvc:exclude-mapping path="/pay/llPayNotify" />
            <!-- 需排除拦截的地址 -->
            <mvc:exclude-mapping path="/invest/invest/*" />
            <mvc:exclude-mapping path="/invest/viewBidInvestRecords" />
            <mvc:exclude-mapping path="/pay/checkBank" />
            <mvc:exclude-mapping path="/pay/checkIdNoExists" />
            <mvc:exclude-mapping path="/integralParadise/exchangeGoodsAttr" />
            <!-- 定义在mvc:interceptor下面的表示是对特定的请求才进行拦截的 -->
            <bean class="com.hengxin.wi11iam.interceptor.LoginInterceptor" />
        </mvc:interceptor>
    </mvc:interceptors>

    <!-- 对模型视图名称的解析，即在模型视图名称添加前后缀 -->
    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver"
        p:prefix="/WEB-INF/views/" p:suffix=".jsp" />

    <bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver"
        p:defaultEncoding="utf-8" p:maxUploadSize="52428880"
        p:maxInMemorySize="4096" />
</beans>

使用<mvc:resources >建立一个服务于静态资源的处理器 不去走DispatherServlet

<mvc:resources mapping="/css/**" location="/css/" />

from的model可以添加注解的校验

 @Length(min = 6,max =  20)
 @NotEmpty
 private String confirmPassword;