01_10_SERVLET如何连接Mysql数据库
1. 实现类
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">");
out.println("<HTML>");
out.println("<HEAD><TITLE>Servlet连接MySQL数据库</TITLE></HEAD>");
out.println("<BODY>");
out.print("<table align="center" border="1"><tr align="center"><td>查询world库中city表中的Name列信息</td></tr>");
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/world?user=root&password=123456");
stmt = (Statement) conn.createStatement();
rs = stmt.executeQuery("select * from city");
while (rs.next()) {
out.println("<tr align="center"><td>" +rs.getString("name") + "</td></tr>");
}
out.println("</table>");
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (rs != null) {
try {
rs.close();
rs = null;
} catch (SQLException e) {
e.printStackTrace();
}
}
if (stmt != null) {
try {
stmt.close();
stmt = null;
} catch (SQLException e) {
e.printStackTrace();
}
}
if (conn != null) {
try {
conn.close();
conn = null;
} catch (SQLException e) {
e.printStackTrace();
}
}
}
out.println("</BODY>");
out.println("</HTML>");
out.flush();
out.close();
}