无法使JDBC驱动程序在tomcat jsp中工作

Question

I try to make a simple example connection to a mysql database in jsp running on tomcat. 我尝试在tomcat上运行的jsp中建立到mysql数据库的简单示例连接。

Running the code below I get the response: No suitable driver found for jdbc:mysql://localhost/TestingDB 运行下面的代码，我得到响应：没有为jdbc找到合适的驱动程序：mysql：// localhost / TestingDB

<HTML>
    <HEAD><TITLE>Testing mysql</TITLE></HEAD>
<BODY>

<%@ page import = "java.sql.*"%>

<%  
        String url = "jdbc:mysql://localhost/TestingDB";

        String user = "mysql";
        String password = "pwd";

    try {
        Connection con = DriverManager.getConnection(url, user, password);
        out.println("Success");
        Statement st = null;
        ResultSet rs = null;
        st = con.createStatement();
        rs = st.executeQuery("SELECT * FROM TestTable");
        while(rs.next()){ 
            out.println(rs.getString("String1"));
        }

    } catch (Exception e) {
        out.println(e.getMessage());
            e.printStackTrace();
        }
%>

</BODY>
</HTML>

I have put the mysql-connector-java-5.1.xx-bin.jar in the CATALINA_HOME/lib directory and when it did not work I tried to put it in the {appname}/WEB-INF/lib directory. 我已经将mysql-connector-java-5.1.xx-bin.jar放在CATALINA_HOME / lib目录中，当它不起作用时，我尝试将其放在{appname} / WEB-INF / lib目录中。

I have restarted tomcat between each try using services tomcat restart . 我已经在每次尝试之间使用服务 重新启动了 tomcat 。

There should not be any problems accessing the database as it works fine using (pretty much) the same code in a standalone java class. 访问数据库应该没有任何问题，因为在独立的Java类中使用（几乎）相同的代码可以正常工作。

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.sql.ResultSet;

class JDBCTest {

    private static final String url = "jdbc:mysql://localhost/TestingDB?useSSL=false";

    private static final String user = "mysql";     
    private static final String password = "pwd";

    public static void main(String args[]) {
            try {
            Connection con = DriverManager.getConnection(url, user, password);
            System.out.println("Success");
            Statement st = null;
            ResultSet rs = null;
            st = con.createStatement();
            rs = st.executeQuery("SELECT * FROM TestTable");
            while(rs.next()){ 
                  System.out.println(rs.getString("String1"));
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

I'm really running out of ideas. 我的想法真的耗尽了。 All help is welcome! 欢迎所有帮助！

Answer 1

I have put the mysql-connector-java-5.1.xx-bin.jar in the CATALINA_HOME/lib directory 我已经将mysql-connector-java-5.1.xx-bin.jar放在CATALINA_HOME / lib目录中

That should work, but you would have to restart Tomcat before testing it. 那应该可以，但是您必须在测试之前重新启动Tomcat。

and when it did not work I tried to put it in the {appname}/WEB-INF/ directory. 当它不起作用时，我尝试将其放在{appname} / WEB-INF /目录中。

Wrong. 错误。 Should be the {appname}/WEB-INF/lib directory. 应该是{appname}/WEB-INF/lib目录。

Howver you should be defining this database as a Resource in your META-INF/context.xml and getting it from Tomcat via a JNDI lookup on the java:comp/env/jdbc namespace. 无论如何，您应该在META-INF / context.xml中将此数据库定义为资源，然后通过java:comp/env/jdbc名称空间上的JNDI查找从Tomcat获取它。 What you're doing is poor practice. 您正在做的是不好的练习。

Answer 2

You forgot to put the port in the URL access. 您忘记将端口放入URL访问。

Here is a simple example for a connection URL: 这是连接URL的简单示例：

jdbc:mysql://localhost: 3306 /TestingDB; jdbc：mysql：// localhost： 3306 / TestingDB;

无法使JDBC驱动程序在tomcat jsp中工作

问题描述

2 个解决方案

解决方案1
3 已采纳 2016-08-18 01:58:56

解决方案2
-1 2016-08-18 11:27:25

无法使JDBC驱动程序在tomcat jsp中工作

问题描述

2 个解决方案

解决方案1 3 已采纳 2016-08-18 01:58:56

解决方案2 -1 2016-08-18 11:27:25

解决方案1
3 已采纳 2016-08-18 01:58:56

解决方案2
-1 2016-08-18 11:27:25