Java 如何为多个.WAR项目构建和连接Spring数据库依赖项.JAR项目?
我正在构建一套web服务,它们都访问相同的数据库,但使用不同的凭据。因此,为了模块化数据库代码,我将其从每个web app.WAR文件中移出,并为数据库调用自己的.JAR文件。因此,如果WebApp1和WebApp2使用getAllColumnsFromTable1 MyBatis调用,我不必在两个项目中定义相同的映射器和域对象。这样,如果表1发生更改,我只需在一个地方更改MyBatis代码,并减少复制和粘贴错误 WebApp1 applicationContext.xml:Java 如何为多个.WAR项目构建和连接Spring数据库依赖项.JAR项目?,java,spring,maven,jndi,mybatis,Java,Spring,Maven,Jndi,Mybatis,我正在构建一套web服务,它们都访问相同的数据库,但使用不同的凭据。因此,为了模块化数据库代码,我将其从每个web app.WAR文件中移出,并为数据库调用自己的.JAR文件。因此,如果WebApp1和WebApp2使用getAllColumnsFromTable1 MyBatis调用,我不必在两个项目中定义相同的映射器和域对象。这样,如果表1发生更改,我只需在一个地方更改MyBatis代码,并减少复制和粘贴错误 WebApp1 applicationContext.xml: <beans
<beans xmlns="http://www.springframework.org/schema/beans"
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/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:annotation-config />
<context:component-scan base-package="com.example.webapp1.service" />
<context:component-scan base-package="com.example.webapp1.controller" />
<bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
<property name="jndiName" value="java:/example/ds/WebApp1DS" />
</bean>
<bean id="databaseConnector" class="com.example.databaseconnector.connector"
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
当我运行WebApp1时,程序失败,因为它找不到TableMapper bean来自动连接服务中的映射器。我缺少了什么样的Spring设置来让这一切一起工作,还是我的做法完全错了?您似乎缺少了
TableMapper
bean的Spring配置。该类需要是一个Springbean,以便将其注入到服务中。
将相关bean配置添加到您的applicationContext.xml
Spring上下文层次结构在常见代码场景中会有所帮助。
如果您在一个EAR中有多个webapp,EAR可以有自己的上下文,即各个webapp上下文的父上下文。
此外,在每个webapp中,还可以有一个根上下文和单个子上下文。
您可以在web.xml中定义此层次结构。父上下文可以通过上下文参数指定:locatorFactorySelector和parentContextKey。通过上下文参数contextConfigLocation创建根上下文(在servlet外部)。可以在每个servlet的init param-context参数中指定子上下文
在EAR中放一个jar,保存所有公共服务和DAO层代码,并在beanRefContext.xml(基本上是另一个应用程序上下文xml)中定义它们。使这个jar在类路径中可用
在要引用父上下文代码的每个应用程序的web.xml中:
<!-- root application context -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:rootContextBeans.xml</param-value>
</context-param>
<!-- shared service layer - parent application context -->
<context-param>
<param-name>locatorFactorySelector</param-name>
<param-value>classpath:beanRefContext.xml</param-value>
</context-param>
<context-param>
<param-name>parentContextKey</param-name>
<param-value>servicelayer-context</param-value>
</context-param>
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
<servlet>
<servlet-name>dispatcherServletApp1</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:webApp1.xml</param-value>
</init-param>
</servlet>
上下文配置位置
类路径:rootContextBeans.xml
定位器工厂选择器
类路径:beanRefContext.xml
parentContextKey
服务层上下文
org.springframework.web.context.ContextLoaderListener
调度员ServletApp1
org.springframework.web.servlet.DispatcherServlet
上下文配置位置
classpath*:webApp1.xml
其中beanRefContext.xml类似于:
<beans>
<bean id="servicelayer-context" class="org.springframework.context.support.ClassPathXmlApplicationContext">
<constructor-arg>
<list>
<value>data-layer-context.xml</value>
</list>
</constructor-arg>
</bean>
</beans>
data-layer-context.xml
这样您就可以实现您想要的。我添加了一个应用程序上下文,并将数据源bean从.war传递到.jar。在java文件中设置它没有问题,但是我无法将数据源传递到applicationContext。因此,我只传递我的Jndi名称字符串,同样的问题再次无法从java类中的变量转到应用程序上下文中的bean。我做的最后一件事是在我的类上实现ApplicationContextAware。我能够将.war中定义的数据源传递给.jar的applicationContext,但是在.jar applicationContext中创建的任何内容都没有传递给.war。
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>databaseconnector</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>Database Connector</name>
<dependencies>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.2.3</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.1</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.0.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.0.0.RELEASE</version>
</dependency>
</dependencies>
</project>
package com.example.databaseconnector.connector;
import javax.sql.DataSource;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.core.io.ClassPathResource;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
public class DatabaseConnection implements InitializingBean {
private DataSource dataSource;
private DataSourceTransactionManager dataSourceTransactionManager;
private SqlSessionFactoryBean sqlSessionFactoryBean;
private MapperScannerConfigurer mapperScannerConfigurer;
public DataSource getDataSource() {
return this.dataSource;
}
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
}
@Override
public void afterPropertiesSet() throws Exception {
if (getDataSource() == null) {
throw new IllegalArgumentException("Property 'dataSource' is required");
} else {
this.configureDataSourceTransactionManager();
this.configureSqlSessionFactoryBean();
this.configureMapperScannerConfigurer();
}
}
private void configureDataSourceTransactionManager() {
this.dataSourceTransactionManager = new DataSourceTransactionManager();
this.dataSourceTransactionManager.setDataSource(dataSource);
}
private void configureSqlSessionFactoryBean() {
this.sqlSessionFactoryBean = new SqlSessionFactoryBean();
this.sqlSessionFactoryBean.setDataSource(dataSource);
this.sqlSessionFactoryBean.setConfigLocation(
new ClassPathResource("mybatis-config.xml"));
this.sqlSessionFactoryBean.setTypeAliasesPackage(
"com.example.sewp5databaseconnector.domain");
}
private void configureMapperScannerConfigurer() {
this.mapperScannerConfigurer = new MapperScannerConfigurer();
this.mapperScannerConfigurer.setBasePackage(
"com.example.databaseconnector.persistence");
this.mapperScannerConfigurer.setSqlSessionFactoryBeanName("sqlSessionFactoryBean");
}
}
<!-- root application context -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:rootContextBeans.xml</param-value>
</context-param>
<!-- shared service layer - parent application context -->
<context-param>
<param-name>locatorFactorySelector</param-name>
<param-value>classpath:beanRefContext.xml</param-value>
</context-param>
<context-param>
<param-name>parentContextKey</param-name>
<param-value>servicelayer-context</param-value>
</context-param>
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
<servlet>
<servlet-name>dispatcherServletApp1</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:webApp1.xml</param-value>
</init-param>
</servlet>
<beans>
<bean id="servicelayer-context" class="org.springframework.context.support.ClassPathXmlApplicationContext">
<constructor-arg>
<list>
<value>data-layer-context.xml</value>
</list>
</constructor-arg>
</bean>
</beans>