Spring 入门配置实例
从登陆模块介绍spring最简单的配置
1、web.xml中配置主控servlet和servlet-mapping,如下：
<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>2、web.xml中配置需要加载的spring配置文件，如applicationContext.xml(项目简单的情况下，单个配置文件就够了)或其它名字（多个用逗号分隔），如下：
<context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath*:*-beans.xml</param-value> </context-param>
3、spring mvc默认拥有一个spring的配置文件，即<servlet-name>-servlet.xml，会自动与其它配置文件进行拼装加载。在该文件中，需要配置扫描及试图解析器，如下：
<context:component-scan base-package="com.xxx.web" >
</context:component-scan>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/pages/"/>
<property name="suffix" value=".jsp"/>
</bean>4、web.xml中配置负责启动spring容器的监听器，如下：
<listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener>
spring容器的启动和关闭由Web容器的启动和关闭事件触发，所以设置监听器以监听。ContextLoaderListener继承自ServletContextListener
5、声明@Controller，@RequestMapping类处理请求，并返回login.jsp页面，如下：
@Controller
public class HelloController {
@RequestMapping(value = "/index.html")
public String loginPage() {
return "login";
}
}6、输入用户名/密码后进行登陆，处理过程需要业务层对用户名和密码进行校验是否存在数据库中，所以在业务层内部还需要与持久层进行交互。如果验证不成功，则返回登陆页面，提示错误。如果验证成功，则获取用户信息，设置最后访问的ip，访问时间，新增登陆积分，并更新到数据库中，此处也需要与持久层交互。
7、建立领域对象User和LoginLog，前者代表用户信息，后者代表日志信息，分别对应数据表t_user，t_login_log。领域对象一般需要实现serializable接口。
8、根据MVC模型特点，一般在控制器类中注入业务层类，如UserService；而在UserService类中注入DAO类与数据库进行交互。
9、首先定义与数据库交互的DAO层，如UserDao。它提供根据用户名和密码进行数据库查询校验的方法，根据用户名获取User领域对象的方法，更新信息到数据库的方法等。如下：
@Repository
public class UserDao{
@Autowired
private JdbcTemplate jdbcTemplate;
public int getMatchCount(String userName, String password){
String sql = "select count(*) from t_user where user_name = ? and password = ? ";
return jdbcTemplate.queryForInt(sql, new Object[]{userName, password};
}
//todo 其它方法
}
在spring配置文件中配置扫描、数据源及其它Bean
10、定义业务层UserService，如下：@Service
public class UserService{
@AutoWired
private UserDao userDao;
....
}同样需要在spring配置文件中配置扫描的包及事务管理器，其它命名空间。
11、单元测试
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"/applicationContext.xml"})//启动spring容器
public class TestUserService{
@Autowired
private UserService userService;//注入spring容器中的Bean
@Test
public void hasMatchUser(){
boolean b1 = userService.func();
assertTrue(...)
}
}
12、配置实例：
（1）web.xml:
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<filter>
<filter-name>encodingFilter</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>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<display-name>xxx</display-name>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:*-beans.xml</param-value>
</context-param>
<!--log4j-->
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>classpath:log4j.properties</param-value>
</context-param>
<listener>
<listener-class>
org.springframework.web.util.Log4jConfigListener
</listener-class>
</listener>
<!--log4j-->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/mvc-dispatcher-servlet.xml</param-value>
</init-param>
<init-param>
<param-name>detectAllHandlerExceptionResolvers</param-name><!-- 取消其自动注册的异常解析器 -->
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>throwExceptionIfNoHandlerFound</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>/assets/*</url-pattern>
</servlet-mapping>
<!-- druid start-->
<filter>
<filter-name>DruidWebStatFilter</filter-name>
<filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>
<init-param>
<param-name>exclusions</param-name>
<param-value>*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*</param-value>
</init-param>
<init-param>
<param-name>sessionStatMaxCount</param-name>
<param-value>1000</param-value>
</init-param>
<init-param>
<param-name>principalCookieName</param-name>
<param-value>__bigdata</param-value>
</init-param>
<init-param>
<param-name>profileEnable</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>DruidWebStatFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<servlet>
<servlet-name>DruidStatView</servlet-name>
<servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
<init-param>
<!-- 允许清空统计数据 -->
<param-name>resetEnable</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>loginUsername</param-name>
<param-value>root</param-value>
</init-param>
<init-param>
<param-name>loginPassword</param-name>
<param-value>rootpass</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>DruidStatView</servlet-name>
<url-pattern>/druid/*</url-pattern>
</servlet-mapping>
<!-- druid end-->
<session-config>
<session-timeout>43200</session-timeout>
</session-config>
</web-app>（2）servlet-name-servlet.xml
<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:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
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
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
<!--声明使用注解 -->
<context:annotation-config />
<!--自动注册controller -->
<context:component-scan base-package="xxx.controller" >
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service"/>
</context:component-scan>
<mvc:annotation-driven />
<mvc:interceptors>
<bean class="xxx.interceptor.LoginInterceptor"/>
<bean class="xxx.interceptor.XXXInterceptor"/>
</mvc:interceptors>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/pages/"/>
<property name="suffix" value=".jsp"/>
</bean>
<bean id="druid-stat-interceptor" class="com.alibaba.druid.support.spring.stat.DruidStatInterceptor" />
<bean id="druid-stat-pointcut" class="org.springframework.aop.support.JdkRegexpMethodPointcut" scope="prototype">
<property name="patterns">
<list>
<value>xxx.web.service.*</value>
<value>xxx.web.controller.*</value>
</list>
</property>
</bean>
<aop:aspectj-autoproxy proxy-target-class="true"/>
<bean class="xxx.web.common.LogAspect" />
<aop:config proxy-target-class="true">
<aop:advisor advice-ref="druid-stat-interceptor" pointcut-ref="druid-stat-pointcut" />
</aop:config>
<!-- SpringMVC上传文件时，需要配置MultipartResolver处理器 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="utf-8" />
<property name="maxUploadSize" value="102400" />
<property name="maxInMemorySize" value="102400" />
</bean>
</beans>（3）other-beans.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:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
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">
<!-- enable autowire -->
<context:annotation-config />
<!-- enable transaction demarcation with annotations -->
<tx:annotation-driven/>
<bean id="messageConverters" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" />
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters" ref="messageConverters">
</property>
</bean>
<bean id="handlerExceptionResolver" class="xxx.web.common.AnnotationHandlerMethodExceptionResolver">
<property name="defaultErrorView" value="common/500"/><!-- 错误页面 -->
<property name="defaultNotFoundView" value="common/404"/><!-- 404页面 -->
<property name="messageConverters" ref="messageConverters"/>
</bean>
<bean id="springQtzJobMethod" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
<property name="targetObject">
<bean class="xxx.web.common.MetricsJob">
<property name="metricsService" ref="metricsService"/>
</bean>
</property>
<property name="targetMethod" value="execute"/>
</bean>
<bean id="dailyTaskCronTriggerBean" class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">
<property name="jobDetail" ref="springQtzJobMethod"></property>
<!-- 每隔两分钟触发 -->
<property name="cronExpression" value="0 */5 * * * ?"></property>
</bean>
<bean id="SpringJobSchedulerFactoryBean" class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
<property name="triggers">
<list>
<ref bean="dailyTaskCronTriggerBean"/>
</list>
</property>
</bean>
</beans>okay!!!