Question

我使用spring和hibernate来处理多个数据库服务器保存，使用2个数据源配置同时更新。我正在使用

org.springframework.jdbc.datasource.DriverManagerDataSource

用于创建数据源的类。如果数据库服务器都启动/运行，那么它的工作正常。如果我关闭我的一个数据库服务器并尝试捕获异常，那么它就不会进入catch块并在我的网络浏览器上显示堆栈跟踪错误。

Stack Trace:

    ** BEGIN NESTED EXCEPTION **
    java.net.ConnectException
    MESSAGE: Connection refused: connect
STACKTRACE:

java.net.ConnectException: Connection refused: connect
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
    at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
    at java.net.Socket.connect(Socket.java:525)
    at java.net.Socket.connect(Socket.java:475)
    at java.net.Socket.(Socket.java:372)
    at java.net.Socket.(Socket.java:215)
    at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:256)
    at com.mysql.jdbc.MysqlIO.(MysqlIO.java:271)
    at com.mysql.jdbc.Connection.createNewIO(Connection.java:2771)
    at com.mysql.jdbc.Connection.(Connection.java:1555)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
    at java.sql.DriverManager.getConnection(DriverManager.java:582)
    at java.sql.DriverManager.getConnection(DriverManager.java:154)
    at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:173)
    at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriver(DriverManagerDataSource.java:164)
    at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnectionFromDriver(AbstractDriverBasedDataSource.java:149)
    at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnection(AbstractDriverBasedDataSource.java:119)
    at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:82)
    at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446)
    at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)
    at org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:116)
    at org.hibernate.id.insert.AbstractSelectingDelegate.performInsert(AbstractSelectingDelegate.java:54)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2186)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2666)
    at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:71)
    at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)
    at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:321)
    at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:204)
    at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:130)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
    at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
    at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
    at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:562)
    at org.hibernate.impl.SessionImpl.save(SessionImpl.java:550)
    at org.hibernate.impl.SessionImpl.save(SessionImpl.java:546)
    at org.springframework.orm.hibernate3.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:686)
    at org.springframework.orm.hibernate3.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:1)
    at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:406)
    at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
    at org.springframework.orm.hibernate3.HibernateTemplate.save(HibernateTemplate.java:683)
    at com.service.RegistrationServiceImpl.add(RegistrationServiceImpl.java:56)
    at com.controller.RegistrationController.onSubmit(RegistrationController.java:48)
    at org.springframework.web.servlet.mvc.SimpleFormController.processFormSubmission(SimpleFormController.java:272)
    at org.springframework.web.servlet.mvc.AbstractFormController.handleRequestInternal(AbstractFormController.java:268)
    at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
    at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:763)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:709)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:613)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:536)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:879)
    at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
    at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
    at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
    at java.lang.Thread.run(Thread.java:619)


** END NESTED EXCEPTION *

如何处理此异常。我想在我的GUI中显示我的某个数据库服务器已关闭如果我的任何数据库服务器已关闭。

请帮忙。

Answer 1

我认为有两种选择：

列表项您应该在服务层中捕获异常（例如在RegistrationServiceImpl中），但您必须在所有服务类中执行此操作。
创建一个捕获此特定异常的Servlet过滤器，并将用户重定向到显示“抱歉，数据库已关闭”之类的页面。

Answer 2

春天有@ExceptionHandler注释。您可以在自己的一些常见类中创建处理程序方法。每当抛出异常时，您可以方便地显示您想要的消息，具体取决于抛出的异常

@Component
public class BaseController {

@ExceptionHandler(Throwable.class)
public ModelAndView handleException(Throwable throwable, HttpServletRequest request){

    ModelAndView view = null;
    if (throwable instanceof ConnectException){
        view = //set message and return view;
    }else if (throwable instanceof someOtherException) {
        //do something else;

 //handle as many exceptions as you want
    }else {
           //do something by default for other unhandled/generic exceptions 
          }

    return view;
}

}

documentation详细说明了支持的返回类型。

您还可以使处理程序仅处理您想要的异常类型，如下所示：

@ExceptionHandler(ConnectException.class)
public ModelAndView handleException(ConnectException ex, HttpServletRequest request){
// handle it 
}

您可以查看类似行上的example。

我希望这会有所帮助。干杯：）

如何使用spring和hibernate处理多个数据库连接的错误/异常？

2 个答案: