[英]Maven How to use dependencies of a jar project defined as a dependency of a war project
[英]How to build and wire Spring database dependency .JAR project for use with multiple .WAR projects?
我正在构建一套Web服务,它们都访问同一数据库,但使用不同的凭据。 因此,为了使数据库代码模块化,我将其移出每个Web应用程序.WAR文件,并给数据库调用其自己的.JAR文件。 这样,如果WebApp1和WebApp2使用getAllColumnsFromTable1 MyBatis调用,则不必在两个项目中都定义相同的映射器和域对象。 这样,只要Table1发生更改,我只需要在一个位置更改MyBatis代码,并减少复制和粘贴错误。
WebApp1 applicationContext.xml:
<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>
因此,我想传递给数据库连接器.JAR文件的只是.WAR使用的数据源。
WebApp1 pom.xml:
<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>WebApp1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>3.2.3.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>3.2.3.RELEASE</version>
</dependency>
<dependency>
<groupId>com.example</groupId>
<artifactId>databaseconnector</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
然后在.WAR中的一项服务中添加类似的内容
WebApp1 Service.java:
package com.example.webapp1.service;
import com.example.databaseconnector.domain.TableSearchResult;
import com.example.databaseconnector.persistence.TableMapper;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class Service {
@Autowired
private TableMapper tableMapper;
public List<TableSearchResult> getSearchResults(String param) {
return tableMapper.getAllColumnsFromTable1(param);
}
}
然后在.JAR方面,我有
databaseconnector pom.xml:
<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>
databaseconnector DatabaseConnection.java:
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");
}
}
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。 我错过了什么Spring设置才能使所有这些协同工作,还是我要以一种完全错误的方式来解决这个问题?
您似乎缺少TableMapper
bean的Spring配置。 该类必须是Spring Bean,才能将其注入Service
。 将相关的Bean配置添加到applicationContext.xml
Spring上下文层次结构可以在常见的代码场景中提供帮助。 如果单个EAR中有多个Web应用程序,则EAR可以具有自己的上下文,该上下文是各个Webapp上下文的父级。 同样在每个Web应用程序中,您也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。 可以通过上下文参数指定父上下文:locatorFactorySelector和parentContextKey。 通过上下文参数contextConfigLocation(servlet外部)根上下文。 子上下文可以在每个servlet的init参数-上下文参数中指定。
在EAR中有一个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。 使此jar在classpath中可用。
在每个要引用父上下文代码的应用程序的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>
其中,beanRefContext.xml如下所示:
<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>
这样,您将实现您想要的。
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