SpringMVC高级

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SpringMVC高级

SpringMVC高级

1. 添加其它Servlet和Filter

根据Servlet3.0+特性，容器会在类路径中查找实现了javax.servlet.ServletContainerInitializer接口的类，如果能发现的话，就会用它来配置Servlet。而Spring提供了这个接口的实现，名为SpringServletContainerInitializer，这个类会反过来查找实现了WebApplicationInitializer的类并将配置的任务交给它们来完成。

我们可以利用上述特点，来给项目添加其它Servlet和Filter。我们可以在自己编写的SpringWebAppInitializer中重写父类的onStartup()方法即可，因为父类已经实现了WebApplicationInitializer接口：

@Override
public void onStartup(ServletContext servletContext) throws ServletException {
    super.onStartup(servletContext);

    Dynamic servlet = servletContext.addServlet("helloServlet", HelloServlet.class);
    servlet.addMapping("/servlet/hello");

    javax.servlet.FilterRegistration.Dynamic filter = servletContext.addFilter("helloFilter", HelloFilter.class);
    filter.addMappingForUrlPatterns(null, false, "/servlet/*");

    System.out.println("注册完毕...");
}

2. multipart请求处理

配置multipart，需要在SpringWebAppInitializer中重写父类方法：

@Override
protected void customizeRegistration(Dynamic registration) {
    super.customizeRegistration(registration);
    registration.setMultipartConfig(new MultipartConfigElement(
        // 上传过程中使用的临时文件路径
        "c:/Other/upload",
        // 上传文件的最大容量
        2097152,
        // 整个multipart请求的最大容量
        4194304,
        // 上传过程中，文件大小达到一个指定容量，将会写入到临时文件路径
        0));
}

处理multipart请求：

@Controller
public class FileController {

	@RequestMapping(value = "/upload", method = RequestMethod.GET)
	public String showUpload() {
		return "file";
	}

	@RequestMapping(value = "/upload", method = RequestMethod.POST)
	public String upload(@RequestPart("icon") Part icon, String userName) throws IOException {
		System.out.println(userName);
		String fileName = icon.getSubmittedFileName();
		icon.write("c:/Other/" + fileName);
		return "success";
	}

}

3. 异常处理

我们可以使用通知来统一处理控制器中出现的错误，处理方式一般为跳转至较为友好的错误提示页面：

@ControllerAdvice
public class ErrorHandler {

	@ExceptionHandler(Exception.class)//设置针对什么样的异常进行处理
	public String errorHandle() {
		return "error";
	}

}

提示：可以修改上传文件的最大容量来触发异常。

4. 基于Xml配置SpringMVC

4.1 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"
	id="WebApp_ID" version="3.1">

	<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>

	<servlet>
		<servlet-name>mvc</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath:spring-web.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
		<multipart-config>
			<location>c:/Other/upload</location>
			<max-file-size>2097152</max-file-size>
			<max-request-size>4194304</max-request-size>
			<file-size-threshold>0</file-size-threshold>
		</multipart-config>
	</servlet>
	<servlet-mapping>
		<servlet-name>mvc</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>

	<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>
		<init-param>
			<param-name>forceEncoding</param-name>
			<param-value>true</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>encoding</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

</web-app>

4.2 spring-web.xml

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

	<mvc:annotation-driven />
	<mvc:default-servlet-handler />
	<context:component-scan
		base-package="com.turing.web" />

	<bean id="templateResolver"
		class="org.thymeleaf.spring4.templateresolver.SpringResourceTemplateResolver">
		<property name="prefix" value="/"></property>
		<property name="suffix" value=".html"></property>
		<property name="templateMode" value="HTML"></property>
		<property name="cacheable" value="false"></property>
	</bean>
	<bean id="templateEngine"
		class="org.thymeleaf.spring4.SpringTemplateEngine">
		<property name="enableSpringELCompiler" value="true"></property>
		<property name="templateResolver" ref="templateResolver"></property>
	</bean>
	<bean id="viewResolver"
		class="org.thymeleaf.spring4.view.ThymeleafViewResolver">
		<property name="templateEngine" ref="templateEngine"></property>
		<property name="characterEncoding" value="utf-8"></property>
	</bean>
	<mvc:interceptors>
		<mvc:interceptor>
			<mvc:mapping path="/**" />
			<mvc:exclude-mapping path="/" />
			<mvc:exclude-mapping path="/login" />
			<bean class="com.turing.web.interceptors.LoginInterceptors"></bean>
		</mvc:interceptor>
	</mvc:interceptors>
</beans>

4.3 spring-root.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	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/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">
	<context:component-scan
		base-package="com.turing">
		<context:exclude-filter type="annotation"
			expression="org.springframework.web.bind.annotation.ControllerAdvice" />
		<context:exclude-filter type="annotation"
			expression="org.springframework.stereotype.Controller" />
	</context:component-scan>

	<bean id="dataSource"
		class="org.apache.commons.dbcp2.BasicDataSource">
		<property name="username" value="root"></property>
		<property name="password" value="admin"></property>
		<property name="url" value="jdbc:mysql://localhost:3306/test"></property>
		<property name="driverClassName"
			value="com.mysql.jdbc.Driver"></property>
		<property name="initialSize" value="5"></property>
		<property name="minIdle" value="2"></property>
		<property name="maxIdle" value="16"></property>
		<property name="maxTotal" value="8"></property>
		<property name="maxWaitMillis" value="60000"></property>
		<property name="validationQuery" value="select 1"></property>
	</bean>
	<bean id="sqlSessionFactory"
		class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource"></property>
		<property name="configuration">
			<bean class="org.apache.ibatis.session.Configuration">
				<property name="logImpl"
					value="org.apache.ibatis.logging.log4j2.Log4j2Impl"></property>
				<property name="mapUnderscoreToCamelCase" value="true"></property>
				<property name="lazyLoadingEnabled" value="true"></property>
				<property name="aggressiveLazyLoading" value="false"></property>
				<property name="lazyLoadTriggerMethods" value=""></property>
			</bean>
		</property>
	</bean>

	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="basePackage" value="com.turing.mapper"></property>
	</bean>

	<bean id="transactionManager"
		class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="dataSource"></property>
	</bean>
	<tx:advice id="txAdvice"
		transaction-manager="transactionManager">
		<tx:attributes>
			<tx:method name="find*" propagation="SUPPORTS"
				read-only="true" />
			<tx:method name="check*" propagation="SUPPORTS"
				read-only="true" />
			<tx:method name="save*" propagation="REQUIRED" />
			<tx:method name="delete*" propagation="REQUIRED" />
			<tx:method name="update*" propagation="REQUIRED" />
		</tx:attributes>
	</tx:advice>
	<aop:config>
		<aop:advisor
			pointcut="execution(* com.turing.service..*.*(..))"
			advice-ref="txAdvice" />
	</aop:config>

</beans>

me=“delete*” propagation=“REQUIRED” />
<tx:method name=“update*” propagation=“REQUIRED” />
</tx:attributes>
</tx:advice>
aop:config
<aop:advisor
pointcut=“execution(* com.turing.service….(…))”
advice-ref=“txAdvice” />
</aop:config>

```