在Spring中更新属性文件中的数据库设置
我是Spring的新手我正在尝试创建一个数据库管理器页面，该页面显示页面加载时的数据库详细信息，并在用户按下提交时更新数据库设置
我按照本教程并在属性文件中设置了数据库设置。
我设法以编程方式更新属性文件中的数据库设置。 当我使用以下代码检索数据库设置时
DriverManagerDataSource databaseSource = (DriverManagerDataSource)context.getBean("dataSource"); databaseSource.getUsername(); 我设法获得旧值并且无法获得新值
这是applicationContext.xml文件中的映射
classpath:/bundle/database.properties
我检查了属性文件，发现它是用最新的输入更新的。
我错过了什么？
提前致谢
PS我在Spring 3中使用JSF1.2
更新
只是让我的要求变得简单。 我正在创建一个setparate dbsettings页面，这样当用户希望连接到不同的数据库时，他/她可以在dbsettings页面中输入详细信息并连接
更新
我使用此代码来检索应用程序上下文
private ApplicationContext context;
….
ServletContext servletContext = FacesUtil.getServletContext(); this.context = WebApplicationContextUtils .getRequiredWebApplicationContext(servletContext);
如果我将其更改为AbstractApplicationContext，我需要在上面的代码中进行哪些更改？
UPDATE
this.context = (AbstractApplicationContext)WebApplicationContextUtils .getRequiredWebApplicationContext(servletContext); String valueForTheProperty = ""; context.refresh();
当我添加上面的行时，我得到了
org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is java.lang.NullPointerException org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:599) org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:377) org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:263) org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:101) org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204) $Proxy1.getDatabasePasswordFromSettings(Unknown Source) com.smartcall.delegate.DbSettingsDelegate.getDatabasePassswordFromSettings(DbSettingsDelegate.java:38) com.smartcall.bean.DbSettingsBean.loadDatabaseSettings(DbSettingsBean.java:49) com.smartcall.bean.DbSettingsBean.(DbSettingsBean.java:41) sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) java.lang.reflect.Constructor.newInstance(Constructor.java:513) java.lang.Class.newInstance0(Class.java:355) java.lang.Class.newInstance(Class.java:308) com.sun.faces.mgbean.BeanBuilder.newBeanInstance(BeanBuilder.java:185) com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:105) com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:368) com.sun.faces.mgbean.BeanManager.create(BeanManager.java:230) com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:86) javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54) com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72) org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:68) org.apache.el.parser.AstValue.getValue(AstValue.java:112) org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186) com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71) com.sun.faces.application.ApplicationImpl.createComponent(ApplicationImpl.java:246) com.sun.facelets.tag.jsf.ComponentHandler.createComponent(ComponentHandler.java:224) com.sun.facelets.tag.jsf.ComponentHandler.apply(ComponentHandler.java:139) com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47) com.sun.facelets.tag.jsf.ComponentHandler.applyNextHandler(ComponentHandler.java:314) com.sun.facelets.tag.jsf.ComponentHandler.apply(ComponentHandler.java:169) com.sun.facelets.tag.jsf.core.ViewHandler.apply(ViewHandler.java:109) com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47) com.sun.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:49) com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47) com.sun.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:25) com.sun.facelets.impl.DefaultFacelet.apply(DefaultFacelet.java:95) com.sun.facelets.FaceletViewHandler.buildView(FaceletViewHandler.java:524) com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:567) org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100) org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:176) com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110) com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100) com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) javax.faces.webapp.FacesServlet.service(FacesServlet.java:266) org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:178) org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290) org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388) org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515) root cause java.lang.NullPointerException org.hibernate.cache.impl.bridge.RegionFactoryCacheProviderBridge.nextTimestamp(RegionFactoryCacheProviderBridge.java:85) org.hibernate.impl.SessionFactoryImpl.openSession(SessionFactoryImpl.java:526) org.hibernate.impl.SessionFactoryImpl.openSession(SessionFactoryImpl.java:535) org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:493) org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:377) org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:263) org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:101) org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171) org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204) $Proxy1.getDatabasePasswordFromSettings(Unknown Source) com.smartcall.delegate.DbSettingsDelegate.getDatabasePassswordFromSettings(DbSettingsDelegate.java:38) com.smartcall.bean.DbSettingsBean.loadDatabaseSettings(DbSettingsBean.java:49) com.smartcall.bean.DbSettingsBean.(DbSettingsBean.java:41) sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) java.lang.reflect.Constructor.newInstance(Constructor.java:513) java.lang.Class.newInstance0(Class.java:355) java.lang.Class.newInstance(Class.java:308) com.sun.faces.mgbean.BeanBuilder.newBeanInstance(BeanBuilder.java:185) com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:105) com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:368) com.sun.faces.mgbean.BeanManager.create(BeanManager.java:230) com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:86) javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54) com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72) org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:68) org.apache.el.parser.AstValue.getValue(AstValue.java:112) org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186) com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71) com.sun.faces.application.ApplicationImpl.createComponent(ApplicationImpl.java:246) com.sun.facelets.tag.jsf.ComponentHandler.createComponent(ComponentHandler.java:224) com.sun.facelets.tag.jsf.ComponentHandler.apply(ComponentHandler.java:139) com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47) com.sun.facelets.tag.jsf.ComponentHandler.applyNextHandler(ComponentHandler.java:314) com.sun.facelets.tag.jsf.ComponentHandler.apply(ComponentHandler.java:169) com.sun.facelets.tag.jsf.core.ViewHandler.apply(ViewHandler.java:109) com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47) com.sun.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:49) com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47) com.sun.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:25) com.sun.facelets.impl.DefaultFacelet.apply(DefaultFacelet.java:95) com.sun.facelets.FaceletViewHandler.buildView(FaceletViewHandler.java:524) com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:567) org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100) org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:176) com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110) com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100) com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) javax.faces.webapp.FacesServlet.service(FacesServlet.java:266) org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:178) org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290) org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388) org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
当我评论出这条线
context.refresh()
申请工作正常。 Plz的帮助
UPDATE
DBSettingBean
public DbSettingsBean() { dbSettingsDelegate = new DbSettingsDelegate(); loadDatabaseSettings(); submitButton.setRendered(false); testButton.setRendered(true); } public void loadDatabaseSettings() { this.setUserName(dbSettingsDelegate.getDatabaseUserNameFromSettings()); this.setPassword(dbSettingsDelegate.getDatabasePassswordFromSettings()); this.setServerName(dbSettingsDelegate.getDatabaseServerNameFromSettings()); this.setDataSourceName(dbSettingsDelegate.getDatabaseNameFromSettings()); } public HtmlOutputText getText() { return text; } public void setText(HtmlOutputText text) { this.text = text; } public HtmlAjaxCommandButton getSubmitButton() { return submitButton; } public void setSubmitButton(HtmlAjaxCommandButton submitButton) { this.submitButton = submitButton; } public HtmlCommandButton getTestButton() { return testButton; } public void setTestButton(HtmlCommandButton testButton) { this.testButton = testButton; } public HtmlOutputText getStatusMessageComponent() { return statusMessageComponent; } public void setStatusMessageComponent(HtmlOutputText statusMessageComponent) { this.statusMessageComponent = statusMessageComponent; } public UIInput getPassworder() { return passworder; } public void setPassworder(UIInput passworder) { this.passworder = passworder; } public String getServerName() { return serverName; } public void setServerName(String serverName) { this.serverName = serverName; } public String getDataSourceName() { return dataSourceName; } public void setDataSourceName(String dataSourceName) { this.dataSourceName = dataSourceName; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String testWhetherTheConnectionExists() { return dbSettingsDelegate.checkWhetherDatabaseConnectionExists(getUserName(), getPassword(), getDataSourceName(),getServerName()); }
和..
DbSettingsDelegate
public DbSettingsDelegate() { try { System.out.println("Dbsettings delegate: "+FacesContext.getCurrentInstance()); dbSettingsService = (DbSettingsService) ServiceLocator .getInstance().getService( ServiceLocator.Services.DBSETTINGS); } catch (Exception e) { logger.debug("error in AddressBookDelegate constructor", e); } } public String getDatabaseUserNameFromSettings() { return dbSettingsService.getDatabaseUserNameFromSettings(); } public String getDatabasePassswordFromSettings() { return dbSettingsService.getDatabasePasswordFromSettings(); } public String getDatabaseServerNameFromSettings() { return dbSettingsService.getDatabaseServerNameFromSettings(); } public String getDatabaseNameFromSettings() { return dbSettingsService.getDatabaseNameFromSettings(); } public String checkWhetherDatabaseConnectionExists(String theUserName,String thePassword,String theDatabaseName,String theServerName) { return dbSettingsService.checkWhetherTheDatabaseConnectionExists(theUserName, thePassword, theDatabaseName, theServerName); }
这是检索要向用户显示的数据库详细信息的代码
ServletContext servletContext = FacesUtil.getServletContext(); this.context = (AbstractApplicationContext)WebApplicationContextUtils .getRequiredWebApplicationContext(servletContext); String valueForTheProperty = ""; DriverManagerDataSource databaseSource = null; context.refresh(); databaseSource = (DriverManagerDataSource)context.getBean("dataSource"); if(theProperty.equalsIgnoreCase("username")) { valueForTheProperty = databaseSource.getUsername(); } else if(theProperty.equalsIgnoreCase("password")) { valueForTheProperty = databaseSource.getPassword(); } else if(theProperty.equalsIgnoreCase("server")) { valueForTheProperty = this.splitUrlAndGetValueForKey(databaseSource.getUrl(), "server"); System.out.println("Server: "+valueForTheProperty); } else { valueForTheProperty = this.splitUrlAndGetValueForKey(databaseSource.getUrl(), "databasename"); }
更新当我调试代码时，我在控制台中找到了这些行。 调用context.refresh()
Dec 28, 2010 3:22:44 PM org.hibernate.tool.hbm2ddl.SchemaUpdate execute INFO: Running hbm2ddl schema update Dec 28, 2010 3:22:44 PM org.hibernate.tool.hbm2ddl.SchemaUpdate execute INFO: fetching database metadata Dec 28, 2010 3:22:44 PM org.hibernate.tool.hbm2ddl.SchemaUpdate execute INFO: updating schema Dec 28, 2010 3:22:44 PM org.hibernate.tool.hbm2ddl.SchemaUpdate execute INFO: schema update complete
所以我可以假设一些更新继续进行。 无法确定为什么我一直在获得旧的价值
更新完整的applicationCOntext.xml文件
classpath:/bundle/database.properties org.hibernate.dialect.MySQLDialect true update true org.hibernate.cache.HashtableCacheProvider true UTF-8 PROPAGATION_REQUIRED,readOnly PROPAGATION_REQUIRED PROPAGATION_REQUIRED PROPAGATION_REQUIRED
context.refresh（）刷新我认为的整个applicationContext bean。 好了，我现在删除了那些delgate和服务，应用程序现在直接调用
我现在不使用DBSettingsDelegate
UPDATE
更新属性文件代码
Properties properties = new Properties(); String a = Thread.currentThread() .getContextClassLoader() .getResource("/com/smartcall/bundle/database.properties").getFile(); a = a.replaceAll("%20", " "); String url = ""; url = "jdbc:mysql://"+theServerName+":3306/"+theDatabaseName+"?characterEncoding=UTF-8"; File file = new File(a); //file.setWritable(true); System.out.println(url); System.out.println(file.getAbsolutePath()); FileInputStream stream = new FileInputStream(file); properties.load(stream); properties.put("jdbc.username", theUserName); properties.put("jdbc.password", thePassword); properties.put("jdbc.url", url); properties.store(new FileOutputStream(file),null);
您需要刷新应用程序上下文并再次获取Bean DriverManagerDataSource ，以反映写入属性文件的更改。
context.refresh(); DriverManagerDataSource databaseSource = (DriverManagerDataSource)context.getBean("dataSource"); databaseSource.getUsername();
获取资源的File对象的提示：
URI a = getClass().getResource("/com/smartcall/bundle/database.properties").toURI(); File file = new File(a);
您不需要解码路径，即用“”替换％20。 Referrence
在应用程序启动时读取值，将它们设置为目标对象（在您的情况下为数据源），并且不再读取属性文件。 因此，即使您更改了值，它们也不会反映在任何地方。
要使PropertyPlaceholderConfigurer重新加载您必须扩展它的值并指定重新加载期。 但是仍然不会更新数据源。 您还应该扩展数据源类，并在给定的时间间隔后重新读取属性。 或者您可以将DataSource声明为范围prototype ，以便获取新实例。同时，重新加载属性。
这是如果您不想重新启动整个上下文（可能需要很长时间）