java连接mysql方法

1.打开mysql服务
2.查看端口号方法


在你的my.ini(Windows)或my.cfg(Linux) 中就有啊。

或者如果已经连入MySQL可以直接
SQL codemysql> show variables like 'port';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| port | 3306 |
+---------------+-------+
1 row in set (0.00 sec)

3306 是默认端口。

3.导入驱动。
4.DBManager.java代码
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package com.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DBManager {
public static Connection getConnection() throws SQLException {
try {
System.out.println("---------connection-----------");
// Class.forName("oracle.jdbc.driver.OracleDriver");
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
System.out.println("111111111111111111");
e.printStackTrace();
}
System.out.println("123123131");
Connection con = DriverManager.getConnection(

// 111 "jdbc:oracle:thin:@localhost:1521:orcl","dbconnect","dbconnect");
// System.out.println("---------1111111111111111111111111111111111111111111111111---------");

"jdbc:mysql://localhost:3306/dbconnect?"+"user=dbconnect&password=dbconnect&useUnicode=true&characterEncoding=gb2312");

return con;
}


public static void clearup(PreparedStatement pstmt) {
if (pstmt != null) {
try {
pstmt.close();
} catch (SQLException se) {
se.printStackTrace();
}
pstmt = null;
}
}


public static void clearup(Connection conn, PreparedStatement pstmt) {
if (pstmt != null) {
try {
pstmt.close();
} catch (SQLException se) {
se.printStackTrace();
}
pstmt = null;
}

if (conn != null) {
try {
conn.close();
} catch (SQLException se) {
se.printStackTrace();
}
conn = null;
}

}


public static void clearup(Connection conn, PreparedStatement pstmt,
ResultSet rs) {
if (rs != null) {
try {
rs.close();
} catch (SQLException se) {
se.printStackTrace();
}
rs = null;
}

if (pstmt != null) {
try {
pstmt.close();
} catch (SQLException se) {
se.printStackTrace();
}
pstmt = null;
}

if (conn != null) {
try {
conn.close();
} catch (SQLException se) {
se.printStackTrace();
}
conn = null;
}
}


public static void clearup(PreparedStatement pstmt, ResultSet rs) {
if (rs != null) {
try {
rs.close();
} catch (SQLException se) {
se.printStackTrace();
}
rs = null;
}

if (pstmt != null) {
try {
pstmt.close();
} catch (SQLException se) {
se.printStackTrace();
}
pstmt = null;
}

}


}

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package com.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

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

import com.util.DBConnection;
import com.util.DBManager;

public class DbconnectServlet extends HttpServlet {


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

this.doPost(request, response);
}


public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username=request.getParameter("username");
String password=request.getParameter("password");
System.out.println(username+password);
if(validateUser(username,password))
{
response.sendRedirect("login.jsp");
System.out.println(validateUser(username,password));
}
else
{
response.sendRedirect("error.jsp");
System.out.println(validateUser(username,password));
}
}

private boolean validateUser(String name, String pwd) {
PreparedStatement pstmt = null;
ResultSet rs = null;
try {
System.out.println("===============================aaaa");
pstmt = DBManager.getConnection().prepareStatement(
"select * from login where login_username=? and login_password=?");
pstmt.setString(1, name);
pstmt.setString(2, pwd);
rs = pstmt.executeQuery();
if (rs.next())
return true;
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBManager.clearup(pstmt, rs);
}

return false;
}


}