java - Hibernate可以读取hibernate.cfg.xml的内容但仍然给出错误？

Question

我知道这是一个老问题，但它确实困住了我。

我接受使用classLoader获取inputsream的建议，代码如下:

 public static Session getSession() {
    if (sessionFactory == null) {
        InputStream xmlInputStream = 
                ResourceUtil.getInputStream(HibernateDBUtil.class, CFG_XML);
        Scanner scanner = new Scanner(xmlInputStream);
        //just a test I can read the xml file ,print content here
        while(scanner.hasNext()) System.out.println(scanner.nextLine());
        scanner.close();
        //reget the stream
        xmlInputStream = 
                ResourceUtil.getInputStream(HibernateDBUtil.class, CFG_XML);
        Configuration cfg = new Configuration();
        cfg.addInputStream(xmlInputStream).configure();
        // version 4.3 's way to config
        StandardServiceRegistryBuilder builder = 
                new StandardServiceRegistryBuilder().applySettings
                (cfg.getProperties());  
        StandardServiceRegistryImpl registry = 
                (StandardServiceRegistryImpl) builder.build();  

        sessionFactory = cfg.buildSessionFactory(registry);  
    }
    return sessionFactory.openSession();
}
private static SessionFactory sessionFactory;
private static final String CFG_XML = "properties/hibernate.cfg.xml"; 

我确认ResourceUtil.getInputStream工作正常，因为我可以打印hibernate.cfg.xml的内容，但为什么仍然给我错误:

更新:完整堆栈跟踪:

INFO: HHH000412: Hibernate Core {4.3.0.Final} Jan 10, 2014 11:33:43 PM org.hibernate.cfg.Environment

INFO: HHH000206: hibernate.properties not found Jan 10, 2014 11:33:43 PM org.hibernate.cfg.Environment buildBytecodeProvider

INFO: HHH000021: Bytecode provider name : javassist Jan 10, 2014 11:33:44 PM org.hibernate.cfg.Configuration configure INFO: HHH000043: Configuring from resource: /hibernate.cfg.xml Jan 10, 2014 11:33:44 PM org.hibernate.cfg.Configuration getConfigurationInputStream

INFO: HHH000040: Configuration resource: /hibernate.cfg.xml Exception in thread "main" org.hibernate.HibernateException: /hibernate.cfg.xml not found at org.hibernate.internal.util.ConfigHelper.getResourceAsStream(ConfigHelper.java:173)atorg.hibernate.cfg.Configuration.getConfigurationInputStream(Configuration.java:2093) at org.hibernate.cfg.Configuration.configure(Configuration.java:2074) at org.hibernate.cfg.Configuration.configure(Configuration.java:2054) at cn.edu.gdut.utils.HibernateDBUtil.getSession(HibernateDBUtil.java:49) at cn.edu.gdut.utils.HibernateDBUtil.listBasicElement(HibernateDBUtil.java:25) at cn.edu.gdut.utils.HibernateDBUtil.main(HibernateDBUtil.java:20)

Answer 1

我认为，文件在 IDE 中的位置并不重要。重要的是文件在执行期间在最终包中的位置。

所以，假设 ，您的 properties/文件夹应该成为执行包的根目录。这样，hibernate.cfg.xml 位于 properties/ 中，那么在执行期间它应该位于根目录中。您可以尝试使用

private static final String CFG_XML = "hibernate.cfg.xml";

已更新

Configuration cfg = new Configuration();
cfg.configure("hibernate.cfg.xml");

下面继续您的代码。在hibernate.cfg.xml我提到<mapping resource="pkg/name/of/mapping/file/file.hbm.xml" />