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于 2006-11-09 13:15
test.jsp: <%@page import="javax.sql.DataSource" %> <%@page import="javax.naming.InitialContext" %> <%@page import="java.sql.*" %> <% DataSource ds=null; Connection conn=null; try{ Context initCtx=new InitialContext(); Context envCtx=(Context)initCtx.lookup("java:comp/env"); ds=(DataSource)envCtx.lookup("jdbc/shop"); if(ds!=null) { out.println("已经获得数据源!"); out.println("<br/>"); try{ conn=ds.getConnection(); out.println("连接数据库成功"); }catch(Exception e){out.println("连接失败~"+e);} Statement stmt=conn.createStatement(); ResultSet rs=stmt.executeQuery("select * from userInfo"); while(rs.next()) { out.println("用户名:"+rs.getString(1)); } } else out.println("连接失败!"); }catch(Exception e){out.println;} %> 获取数据源是成功的... server.xml中我是添加了这样的描述: <Context path="/ds" docBase="ds" debug="0" reloadable="true" crossContext="true"> <Resource name="jdbc/shop" auth="Container" type="javax.sql.DataSource"/> <ResourceParams name="jdbc/shop"> <parameter> <name>factory</name> <value>org.apache.commons.dbcp.BasicDataSourceFactory</value> </parameter> <parameter> <name>driverClassName</name> <value>com.microsoft.jdbc.sqlserver.SQLServerDriver</value> </parameter> <parameter> <name>url</name>
<value>jdbc:microsoft.sqlserver://127.0.0.1:1433;DatabaseName=shop</value> </parameter> <parameter> <name>username</name> <value>root</value> </parameter> <parameter> <name>password</name> <value>password</value> </parameter> <parameter> <name>maxActive</name> <value>20</value> </parameter> <parameter> <name>maxIdle</name> <value>10</value> </parameter> <parameter> <name>maxWait</name> <value>-1</value> </parameter> </ResourceParams> </Context> 运行时发生下面的错误: 已经获得数据源! 连接失败~org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null' java.lang.NullPointerException 看了很久也不知道哪里错了...请好心人指点一下...
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