Java Tomcat 8.5 Servlet与SQL Server 2012的连接

我试图在Tomcat8.5上运行的Javaservlet和SQLServer2012上运行的DB之间建立连接

以下是我迄今为止尝试过的东西：

我在JAVA项目中添加了connectorsqljdbc42.jar

还将同一文件复制到C:\ProgramFiles（x86）\Apache Software Foundation\Tomcat 8.5\lib

使用以下替代方法播放连接字符串（在Java代码中）：

final String DB_URL="jdbc:microsoft:sqlserver://DBServer\\Instance1:1433;DatabaseName=" +
          DB_Name + ";user=" + USER + ";password=" + PASS ;

以及：

但我仍然得到以下错误：

SQLException: No suitable driver found for jdbc:sqlserver://DBServer\Instance1:1433;DatabaseName=MyDB;user=Web_Client;password=PWPWPWPW [Ljava.lang.StackTraceElement;@1bd336e
 And the error stack is: 
 java.sql.SQLException: No suitable driver found for jdbc:jdbc:sqlserver://DBServer\Instance1:1433;DatabaseName=MyDB;user=Web_Client;password=PWPWPWPW at 
 java.sql.DriverManager.getConnection(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at 
 DispatcherClass.doGet(DispatcherClass.java:72) at 
 javax.servlet.http.HttpServlet.service(HttpServlet.java:622) at 
 javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at 
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230) at 
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at 
 org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at 
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) at 
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at 
 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) at 
 org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at 
 org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:474) at 
 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) at 
 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at 
 org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624) at 
 org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) at 
 org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349) at 
 org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783) at 
 org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at 
 org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:798) at 
 org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1434) at 
 org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at 
 java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at 
 java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at 
 org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at 
 java.lang.Thread.run(Unknown Source) 

---

我对Java（使用Eclipse创建WAR）和Tomcat都不是很在行。

因为您没有显示相关代码这只是一个猜测，但请看一下，您是否有

类。forName

加载您的驱动程序？谢谢@fvu的快速回复。两件事：首先，我包含了一段定义连接字符串的代码。如果您需要了解更多内容，请告诉我具体内容，我将用它更新我的问题。其次，我在internet上发现，对于SQL Server，不需要声明类。不过，我可能误解了这一评论。请让我知道你还需要什么来帮助我解决这个问题。谢谢您是否只是使用了

DatabaseName

而不是

DatabaseName

？请参阅@fvu：这与数据库名称有何关系？错误明确指出，

未找到合适的驱动程序

SQLException: No suitable driver found for jdbc:sqlserver://DBServer\Instance1:1433;DatabaseName=MyDB;user=Web_Client;password=PWPWPWPW [Ljava.lang.StackTraceElement;@1bd336e
 And the error stack is: 
 java.sql.SQLException: No suitable driver found for jdbc:jdbc:sqlserver://DBServer\Instance1:1433;DatabaseName=MyDB;user=Web_Client;password=PWPWPWPW at 
 java.sql.DriverManager.getConnection(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at 
 DispatcherClass.doGet(DispatcherClass.java:72) at 
 javax.servlet.http.HttpServlet.service(HttpServlet.java:622) at 
 javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at 
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230) at 
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at 
 org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at 
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) at 
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at 
 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) at 
 org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at 
 org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:474) at 
 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) at 
 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at 
 org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624) at 
 org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) at 
 org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349) at 
 org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783) at 
 org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at 
 org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:798) at 
 org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1434) at 
 org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at 
 java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at 
 java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at 
 org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at 
 java.lang.Thread.run(Unknown Source)