关于数据库连接失败的问题··请大神进来看一下

Question

数据库tomcatservermysql

Answer 1

String driverClass = getInitParameter("driverClass");
user = getInitParameter("user");
password = getInitParameter("password");
try{
Class.forName(driverClass);
}catch(ClassNotFoundException ce){
throw new ServletException("加载数据库驱动失败！");
 
}

Answer 2

<init-param>
<param-name>driverClass</param-name>
<param-value>com.mysql.jdbc.Driver</param-value>
</init-param>
<init-param>
<param-name>url</param-name>
<param-value>jdbc:mysql://localhost:3306</param-value>
</init-param>

Answer 3

怎么看驱动版本对不对啊···我的驱动版本是mysql-connector-java-5.1.28-bin.jar

Answer 4

String driverClass = getInitParameter("driverClass");
user = getInitParameter("user");
password = getInitParameter("password");
try{
Class.forName(driverClass);
}catch(ClassNotFoundException ce){
throw new ServletException("加载数据库驱动失败！");
 
}你异常不能这么处理的，这样会丢掉ClassNotFoundException ce的信息的，
估计是类没找到，你打印下ce

Answer 5

jdbc:mysql://localhost:3306/后加上database例：url=jdbc\:mysql\://localhost\:3306/test

Answer 6

String driverClass = getInitParameter("driverClass");
user = getInitParameter("user");
password = getInitParameter("password");
try{
Class.forName(driverClass);
}catch(ClassNotFoundException ce){
throw new ServletException("加载数据库驱动失败！");
 
}你异常不能这么处理的，这样会丢掉ClassNotFoundException ce的信息的，
估计是类没找到，你打印下ce
太感谢你了··打印出异常之后发现原来是没有获取url参数的值··我晕····