netbean+mysql+Tomcat, run project后IE报Cannot create PoolableConnectionFactory，像是数据库拒绝连接，咋办？
为啥？   netbean+mysql+Tomcat,   run   project后IE报org.apache.tomcat.dbcp.dbcp.SQLNestedException:   Cannot   create   PoolableConnectionFactory   (Communications   link   failure   due   to   underlying   exception:  


看起来像是数据库拒绝连接，   IE详细报错如下：
ERROR!
org.apache.tomcat.dbcp.dbcp.SQLNestedException:   Cannot   create   PoolableConnectionFactory   (Communications   link   failure   due   to   underlying   exception:  

**   BEGIN   NESTED   EXCEPTION   **  

java.net.SocketException
MESSAGE:   java.net.ConnectException:   Connection   refused:   connect

STACKTRACE:

java.net.SocketException:   java.net.ConnectException:   Connection   refused:   connect
at   com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:156)
at   com.mysql.jdbc.MysqlIO.(MysqlIO.java:276)
at   com.mysql.jdbc.Connection.createNewIO(Connection.java:2666)
at   com.mysql.jdbc.Connection.(Connection.java:1531)
at   com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at   org.apache.tomcat.dbcp.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:38)
at   org.apache.tomcat.dbcp.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:294)
at   org.apache.tomcat.dbcp.dbcp.BasicDataSource.validateConnectionFactory(BasicDataSource.java:1247)
at   org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1221)
at   org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
at   com.borrowsys.db.ConnectionManager.getConnection(ConnectionManager.java:38)
at   com.borrowsys.db.Worker.getAllItems(Worker.java:56)
at   org.apache.jsp.index_jsp._jspService(index_jsp.java:94)
at   org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at   javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at   org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
at   org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at   org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at   javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at   org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at   org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at   org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)
at   org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at   org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at   org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at   org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at   org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at   org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at   org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at   org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at   org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)