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idea问题记录
2022-07-06 09:18:00 【劲腰傩舞】
目录
新建web项目后点击初始界面的helloservlet之后报错?
我的是因为tomcat的版本问题,从10换成9就没有问题了
css文件无效或者更改css文件后重启无效?
问题:不管怎样修改css文件,启动idea之后都没有效果,除非把css直接写在html中
浏览器:谷歌
先删除idea项目中的target文件
然后删除了浏览器的缓存
再重启就能及时体现效果
莫名其妙
…
我yue了
证书不被信任?
没有破解idea,就是用学生证申请的…
结果
可网上所有人都在说破解…"~%?..,# *'*&℃$︿*?"
暂时不知道为什么
jsp中java代码部分out不可以使用print方法?
除了像网上其他博客
在webapps文件夹下自行建立一个lib然后导入项目之外
只需要在刚开始新建项目的时候
把full platform勾上就可以
不知道具体哪个起了作用
如何导入Mysql驱动
点击download
下载后解压一下
打开idea
然后把整个解压后的文件导入进来
apply就可以了
一个测试样例
package day01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
public class DB1 {
public static String driver="com.mysql.cj.jdbc.Driver";
//需要改成你的用户名和密码
public static String user="root";
public static String password="xxxx";
public static void main(String[] args) {
//创建数据库
try {
Class.forName(driver);
Connection con1;
String url1="jdbc:mysql://localhost:3306";
try {
con1 = DriverManager.getConnection(url1, user, password);
Statement statement=con1.createStatement();
statement.executeUpdate("create database mysql_db1");
statement.close();
con1.close();
} catch (SQLException throwables) {
System.out.println("你的SQL语句写错了。。。");
}
} catch (ClassNotFoundException e) {
System.out.println("驱动有问题");
}
}
}
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