錯(cuò)誤: 找不到或無法加載主類 com.imooc.db.DBUtil實(shí)在不知道怎么回事？？？
package com.imooc.db;
import java.sql.*;
public class DBUtil {
public static void main(String[] args) throws Exception{
? ?final String URL = "jdbc:mysql://127.0.0.1:3306/imooc";
final String USER = "root";
final String PASSWORD = "duzhaoteng110";
Class.forName("com.mysql.jdbc.Driver");
Connection connection = DriverManager.getConnection(URL,USER,PASSWORD);
Statement statement = connection.createStatement();
ResultSet resultset = statement.executeQuery("select * from imooc_goddess");
while(resultset.next()){
System.out.println(resultset.getString("user_name")+","+resultset.getInt("age"));
}
}
}
2017-05-02
package jdbc_test1.com.mcr.test;
import java.sql.*;
public class test {
public static void main(String[] args) {
final String URL = "jdbc:mysql://127.0.0.1:3306/mcr?useUnicode=true&characterEncoding=utf-8";
final String USER = "root";
final String PASSWORD = "123456";
try{
Class.forName("com.mysql.jdbc.Driver");
Connection connection = DriverManager.getConnection(URL,USER,PASSWORD);
Statement statement = connection.createStatement();
ResultSet resultset = statement.executeQuery("select * from test1");
while(resultset.next()){
System.out.println(resultset.getString("user_name")+","+resultset.getInt("age"));
}
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
除了賬號(hào)密碼，數(shù)據(jù)庫(kù)，改了的地方都加粗了，我這樣是沒問題的
2017-08-25
已經(jīng)解決了，謝謝大家
2017-07-09
把整個(gè)java項(xiàng)目的名字換了就行了，不要用老師的jdbc_imooc。
2017-05-02
如果你是就上面代碼運(yùn)行的話，那可能是因?yàn)闆]有main函數(shù)