Question

我正在尝试使用以下servlet建立与数据库的连接:(工作在doGet方法中完成）

package demo;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

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

@WebServlet("/Connect")
public class Connect extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
 * @see HttpServlet#HttpServlet()
 */
public Connect() {
    super();
    // TODO Auto-generated constructor stub
}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    PrintWriter out = response.getWriter();

    try {
        Class.forName("com.mysql.jdbc.Driver");
    } catch (ClassNotFoundException e) {
        out.println("Unable to load database.");
        return;
    }

    Connection conn = null;

    try {
        conn = DriverManager.getConnection("jdbc.mysql://localhost:3306/jakesdb", "root", "sixTeen58");
    } catch (SQLException e) {
        out.println("Unable to connect to the database.");
        return;
    }

    //// Connected to database.  do some work here ////////////
    out.println("Connected to the database!");
    ///////////////////////////////////////////////////////////

    try {
        conn.close();
    } catch (SQLException e) {
        out.println("Unable to close connection to database.");
    }       
}
}

然而，我总是被挂断

try {
        conn = DriverManager.getConnection("jdbc.mysql://localhost:3306/jakesdb", "root", "sixTeen58");
    } catch (SQLException e) {
        out.println("Unable to connect to the database.");
        return;
    }

我已经使用sql workbench验证了用户名（root）和密码（sixTeen58）是否正确，并且端口确实是3306.我的库中有mysql-connector-java-5.1.36.zip并且链接正确。我不确定发生了什么，但每次我在运行页面时都看到“无法连接到数据库”。

知道我做错了吗？

Answer 1

你犯了一个小错误。您需要在:方法的数据库URL处使用冒号.而不是getConnection。改变如：

"jdbc:mysql://localhost:3306/jakesdb" // Use : instead of .

无法使用JSP连接到mySQL数据库

1 个答案: