如何将jdbc.properties传递给Spring / Hibernate？

Question

我在尝试将属性文件中的值传递给Spring时遇到以下错误，因此我不必直接在 hibernate.cfg.xml <中提供它们/ strong>即可。有更好的（和正确的）方法吗？我知道正在引用属性文件，因为如果我输入了无效的密码，它就会失败。我会感激任何帮助。

WARNING: No connection properties specified - the user must supply JDBC connections
Exception in thread "main" org.hibernate.HibernateException: Hibernate Dialect must be explicitly set
    at org.hibernate.dialect.DialectFactory.determineDialect(DialectFactory.java:57)
    at org.hibernate.dialect.DialectFactory.buildDialect(DialectFactory.java:39)
    at org.hibernate.cfg.SettingsFactory.determineDialect(SettingsFactory.java:426)

这是applicationContext.xml：

    <context:component-scan base-package="cmsutil"/>
    <context:property-placeholder location="jdbc.properties"/>

    <bean id="dataSource"
          class="org.springframework.jdbc.datasource.DriverManagerDataSource"
          p:driverClassName="${jdbc.driverClassName}"
          p:url="${jdbc.url}"
          p:username="${jdbc.username}"
          p:password="${jdbc.password}"/>

    <bean id="sessionFactory"
          class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"
          p:dataSource-ref="dataSource"
          p:configurationClass="org.hibernate.cfg.AnnotationConfiguration"
          p:packagesToScan="cmsutil.*">

        <property name="exposeTransactionAwareSessionFactory" value="false" />

        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">${hibernate.dialect}</prop>
                <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
                <prop key="hibernate.format_sql">${hibernate.format_sql}</prop>
                <prop key="hibernate.generate_statistics">${hibernate.generate_statistics}</prop>
            </props>
        </property>

    </bean>

    <bean id="txnManager"
          class="org.springframework.orm.hibernate3.HibernateTransactionManager"
          p:sessionFactory-ref="sessionFactory"/>

    <bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>          

这是我的hibernate.cfg.xml文件：

<hibernate-configuration>
  <session-factory>
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <mapping resource="cmsutil.entity/contentcomponent.hbm.xml"/>
  </session-factory>
</hibernate-configuration>

Per Ramesh的请求 - web.xml

<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>2</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>*.htm</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>redirect.jsp</welcome-file>
    </welcome-file-list>
</web-app>

对于Ramesh，这是我的jdbc.properties，位于根目录（/src/java/jdbc.properties）

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://xx:3306/x
jdbc.username=y
jdbc.password=z


hibernate.dialect=org.hibernate.dialect.MySQLDialect
hibernate.show_sql=true
hibernate.format_sql=false
hibernate.generate_statistics=false

Answer 1

在applicationContext.xml

中添加此bean

<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location"><value>classpath:jdbc.properties</value></property>
    </bean>

在web.xml而不是监听器中更新此内容

<servlet>
    <servlet-name>context</servlet-name>
    <servlet-class>
         org.springframework.web.context.ContextLoaderServlet
      </servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>

Answer 2

我遇到了同样的问题，但这是我的java代码中出错的结果。在调用Configuration之前，需要在buildSessionFactory()上调用configure()。

configure()方法的javadoc：

  

使用应用程序资源中指定的映射和属性   名为hibernate.cfg.xml。

破码：

public static void main(String[] args) {
        Configuration cfg = new Configuration();

        factory = cfg.buildSessionFactory(); // missing the configure() call

        Session s = factory.openSession();
        Transaction tx = null;
        try {
            tx = s.beginTransaction();

<强>解决方案：

public static void main(String[] args) {
        Configuration cfg = new Configuration();

        factory = cfg.configure().buildSessionFactory();

        Session s = factory.openSession();
        Transaction tx = null;
        try {
            tx = s.beginTransaction();

注意：我没有使用Spring配置。