如何使用servlet访问mysql数据库

1. 连接mysql数据库，选取的是name字段，把class文件放到Tomcat安装文件目录/webapps/test/WEB-INF/classes

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ShowRs extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;

        resp.setContentType("text/html");
        resp.setCharacterEncoding("utf8");
        PrintWriter out = resp.getWriter();

        out.println("<table border=1>");
        out.println("<tr><td>Content:</td></tr>");

        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection("jdbc:mysql://localhost/spring?user=root&password=root");
            stmt = conn.createStatement();
            rs = stmt.executeQuery("select * from teams");
            while (rs.next()) {
                out.println("<tr>");
                out.println("<td>" + rs.getString("name") + "</td>");
                out.println("</tr>");
            }
            out.println("</table>");

        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

}

2. 配置web.xml文件，路径在/webapps/test/WEB-INF

        <servlet>
          <servlet-name>ShowRs</servlet-name>
          <servlet-class>ShowRs</servlet-class>
      </servlet>
      
      <servlet-mapping>
          <servlet-name>ShowRs</servlet-name>
          <url-pattern>/ShowRs</url-pattern>
      </servlet-mapping>    

3.将mysql-connector-java-xxx.jar加入到/webapps/test/WEB-INF/lib

4.打开网页进行测试，显示成功！

4.1 数据库表teams原始内容

4.2 通过servlet访问的name字段