Possible Duplicate:
ClassNotFoundException com.mysql.jdbc.Driver
我已经包含了 mysql-connector-java-5.1.16-bin.jar
到我的 Eclipse 库中,此代码基于我在网上找到的教程,因为我以前没有在 Java 中使用过 MySQL。不幸的是,我不知道在哪里使用实际的 mysql-connector-java-5.1.16-bin.jar
控制台打印 Could not find driver.
意思是ClassNotFoundException
被抛出。您是否看到了我没有看到的(可能是显而易见的)问题?
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.sql.Timestamp;
public class MysqlConnector {
private static MysqlConnector instance = null;
private static Connection conn = null;
private static String dbHost = "localhost";
private static String dbPort = "3306";
private static String database = "sample";
private static String dbUser = "root";
private static String dbPassword = "";
public MysqlConnector() {
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://" + dbHost + ":"
+ dbPort + "/" + database + "?" + "user=" + dbUser + "&"
+ "password=" + dbPassword);
} catch (ClassNotFoundException e) {
System.out.println("Could not find driver."); //TODO LOGGER
} catch (SQLException e) {
System.out.println("Could not connect to database."); //TODO LOGGER
}
}
public static MysqlConnector getInstance()
{
if(instance == null)
instance = new MysqlConnector();
return instance;
}
public boolean validateApiKey(String apikey)
{
if(conn != null)
{
Statement query;
try {
query = conn.createStatement();
String sql = "SELECT startdate, expiration, active " + "FROM apikeys "
+ "WHERE apikey = '" + apikey +"'";
ResultSet result = query.executeQuery(sql);
if(result.getFetchSize()>0 && result.getInt("active")==1){
Date now = new Date();
Date startdate = result.getDate("startdate");
Date expirationdate = result.getDate("expiration");
if(now.before(expirationdate) && now.after(startdate)){
return true;
} else {
return false;
}
} else {
return true;
}
} catch (SQLException e) {
e.printStackTrace();
return false;
}
}
return false;
}
}
最佳答案
右键单击您的项目 > 构建路径 > 添加库
并添加 jar 文件。
还要确保它位于您的运行时路径上。 右键单击主类>运行方式>运行配置>类路径
关于Java MySQL : ClassNotFoundException -> Could not find driver,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6203858/