).maven添加jar pom.xml 中添加

        1).  http://mvnrepository.com/，或者：https://search.maven.org/   添加

            <dependencies>

                     <dependency>

                    <groupId>mysql</groupId>

                    <artifactId>mysql-connector-java</artifactId>

                    <version>5.1.47</version>

              </dependency>

</dependencies>

        2).直接下载jar包  在wepapp包下，创建lib文件夹  然后add as library 

2.java 注册驱动

        clas.forname("com.mydql.jdbc.driver");

       Connection conn = drivermanager.getconnection("jdbc:mysql://localhost:3306/stu","root","wang");

3.执行sql语句；

        string sql ="select * from account";

        Statement  stmt = conn.createStatement();

        ResultSet rs = stmt.executeQuery(sql);

4.