引入依赖

  1.     <dependency>
  2.       <groupId>junit</groupId>
  3.       <artifactId>junit</artifactId>
  4.       <version>4.11</version>
  5.       <scope>test</scope>
  6.     </dependency>
  7.     <!-- javax.servlet-api -->
  8.     <dependency>
  9.       <groupId>javax.servlet</groupId>
  10.       <artifactId>javax.servlet-api</artifactId>
  11.       <version>3.1.0</version>
  12.       <scope>provided</scope>
  13.     </dependency>
  15.     <!-- spring-webmvc -->
  16.     <dependency>
  17.       <groupId>org.springframework</groupId>
  18.       <artifactId>spring-webmvc</artifactId>
  19.       <version>5.2.6.RELEASE</version>
  20.     </dependency>
  22.     <!-- lombok -->
  23.     <dependency>
  24.       <groupId>org.projectlombok</groupId>
  25.       <artifactId>lombok</artifactId>
  26.       <version>1.18.10</version>
  27.       <scope>provided</scope>
  28.     </dependency>
  29. <!--    mybatis依赖-->
  30.     <!-- spring-jdbc -->
  31.     <dependency>
  32.       <groupId>org.springframework</groupId>
  33.       <artifactId>spring-jdbc</artifactId>
  34.       <version>5.2.6.RELEASE</version>
  35.     </dependency>
  36.     <!-- mybatis -->
  37.     <dependency>
  38.       <groupId>org.mybatis</groupId>
  39.       <artifactId>mybatis</artifactId>
  40.       <version>3.5.3</version>
  41.     </dependency>
  42.     <!-- mybatis-spring -->
  43.     <dependency>
  44.       <groupId>org.mybatis</groupId>
  45.       <artifactId>mybatis-spring</artifactId>
  46.       <version>2.0.1</version>
  47.     </dependency>
  48.     <!-- mysql-connector-java -->
  49.     <dependency>
  50.       <groupId>mysql</groupId>
  51.       <artifactId>mysql-connector-java</artifactId>
  52.       <version>5.1.46</version>
  53.     </dependency>
  54.     <!-- druid 数据库连接池 -->
  55.     <dependency>
  56.       <groupId>com.alibaba</groupId>
  57.       <artifactId>druid</artifactId>
  58.       <version>1.1.10</version>
  59.     </dependency>
  60. <!--    json-->
  61.     <dependency>
  62.       <groupId>com.fasterxml.jackson.core</groupId>
  63.       <artifactId>jackson-databind</artifactId>
  64.       <version>2.12.1</version>
  65.     </dependency>
  66.     <dependency>
  67.       <groupId>com.alibaba</groupId>
  68.       <artifactId>fastjson</artifactId>
  69.       <version>1.2.70</version>
  70.     </dependency>

web.xml的书写

  • 使用context-param引入父容器
  • 使用监听器ContextLoaderListener,项目已启动就创建父容器
  • 解决乱码问题
  • 引入mvc容器
<context-param>
       <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring-root.xml</param-value>
 </context-param>
 <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
 </listener>
 <!--处理乱码 -->
   <filter>
    <filter-name>encoding</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>encoding</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

<!--  前端控制器-->
  <servlet>
    <servlet-name>et2101</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>
  </servlet>
  <servlet-mapping>
    <servlet-name>et2101</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

此时出现父子容器的概念
image-20210528201408662.png

Spring-root.xml

父容器的配置是在Spring-root.xml中

  • 父容器一般配置与web无关的bean,所以需要指定下注解扫描,指定扫描哪些,排除哪些
  • 书写mybatis配置信息(因为父容器和持久层有关,所以把myabtis配置写在这里),书写SqlsessionFactorybean,返回sqlsessionFactory
  • 配置mapper扫描
<!-- 引入数据库信息   -->
    <context:property-placeholder location="classpath:db.properties"></context:property-placeholder>
<!-- 容器配置-->
    <context:component-scan base-package="com.etoak">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Service"/>
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Repository"/>
    <!--排除-->
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
        <context:exclude-filter type="annotation" expression="org.springframework.web.bind.annotation.RestController"/>
    </context:component-scan>


    <bean class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="ds"></property>
        <property name="mapperLocations" value="classpath:mappers/*.xml"></property>
        <property name="typeAliasesPackage" value="com.etoak.bean"></property>
    </bean>
    <bean id="ds" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${db.driver}"></property>
        <property name="url" value="${db.url}"></property>
        <property name="username" value="${db.user}"></property>
        <property name="password" value="${db.pwd}"></property>
    </bean>

<!--    mapper扫描-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.etoak.mapper"></property>

子容器 Spring-mvc.xml

  • 容器扫描,包含controller、restController 排除service、respository
  • mvc注解驱动，包含处理映射器、处理适配器
  • 配置视图解析器
<context:component-scan base-package="com.etoak">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
        <context:include-filter type="annotation" expression="org.springframework.web.bind.annotation.RestController"/>
        <!--排除-->
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service"/>
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Repository"/>
    </context:component-scan>

    <mvc:annotation-driven></mvc:annotation-driven>

<!--    视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/jsps/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

处理跨域

package com.etoak.filter;



import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebFilter("/*")
public class CrossFilter implements Filter {
    public CrossFilter() {
        System.out.println("Filter构造。。");
    }
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        System.out.println("Filter过滤！！");
        HttpServletResponse httpResponse = (HttpServletResponse) response;

        // 允许所有的请求域名访问我们的跨域资源，可以固定单个或者多个内容
        httpResponse.setHeader("Access-Control-Allow-Origin", "*");//
        // httpResponse.setHeader("Access-Control-Allow-Origin", "http://localhost:9090");// 允许所有的请求域名访问我们的跨域资源，可以固定单个或者多个内容
        httpResponse.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE,PUT");// 允许何种请求方法访问该跨域资源服务器
        httpResponse.setHeader("Access-Control-Max-Age", "3600");// 预检请求的有效期，单位为秒。有效期内，不会重复发送预检请求
        httpResponse.addHeader("Access-Control-Allow-Headers",
                "Accept,Origin, No-Cache, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type, X-E4M-With");// 允许所有的请求header访问，可以自定义设置任意请求头信息 后期加上 authorization
        httpResponse.setHeader("Access-Control-Allow-Credentials", "true");// 是否允许用户发送、处理cookie
        //如果额外设置自己的头需要在这定义
        httpResponse.setHeader("Access-Control-Expose-Headers", "Access-Token");
        chain.doFilter(req, httpResponse);
    }

    @Override
    public void destroy() {

    }
}