前言:本过程从0开始,先是导入最核心的jar包,然后随着ssm中的功能实现,打包===>启动===>报错,一步步解决问题,增加额外的必须的jar包来熟悉ssm
1、导包(核心包)
mybatis:mybatis
msql:mysql-connector-java
spring:spring、spring-core、spring-web、spring-context、spring-beans
spring-mvc:spring-webmvc
mybatis-spring:mybatis-spring
2、配置文件
spring-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">
<!-- 配置成拦截所有的请求,会有效@RequestMapper,如果是配置成*.do则无效 -->
<mvc:annotation-driven />
<!-- 扫描指定包下含有特定注解的类 -->
<context:component-scan base-package="com.test.*"/>
<!-- 静态资源请求,启动容器的默认的handler来处理 -->
<mvc:default-servlet-handler/>
<!-- 试图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>
spring-mybatis.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"
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">
<!-- 数据库连接开始 -->
<context:property-placeholder location="/WEB-INF/classes/datasource.properties"/>
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${driver}"/>
<property name="username" value="${jdbc_username}"/>
<property name="url" value="${url}"/>
<property name="password" value="${pwd}"/>
</bean>
<!-- 数据库连接结束 -->
</beans>
使用的context、mvc、tx、aop……标签时,需加上相应的协议
3、完善过程与问题记录
1)java.lang.NullPointerException
org.springframework.core.SerializableTypeWrapper$TypeProxyInvocationHandler.invoke(SerializableTypeWrapper.java:239)
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.5.3</version>
<exclusions>
<exclusion>
<artifactId>spring</artifactId>
<groupId>org.springframework</groupId>
</exclusion>
</exclusions>
</dependency>
2)增加mybatis数据库操作,在spring-mybatis.xml增加配置
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="classpath:mapperAlias.xml" />
</bean> <!-- DAO接口所在包名,Spring会自动查找其下的类 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.test.dao" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean>
2.1)打包启动 错:java.lang.NoClassDefFoundError: org/springframework/dao/support/DaoSupport,增加spring-tx依赖
2.2)即上之后 打包启动 错误信息有java.lang.NoClassDefFoundError: org/springframework/jdbc/datasource/TransactionAwareDataSourceProxy 增加spring-jdbc的依赖
2.3)单元测试 nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.****.training.service.BeanB] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. 原因是缺少bean的依赖注入。
参考:http://blog.****.net/jiangchao858/article/details/51586515
3)事务管理,在spring-mybatis增加如下配置
<!-- 事务管理 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<tx:advice id="advice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="*" read-only="true" propagation="REQUIRED"/>
</tx:attributes>
</tx:advice>
<aop:config>
<aop:pointcut expression="execution(* com.ljh.dao.*.*(..))" id="aopTest"/>
<aop:advisor pointcut-ref="aopTest" advice-ref="advice" />
</aop:config>
效果是为com.ljh.dao包下所有接口中的所有方法,设置只读的事务。
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