我正试图使用jsp和servlet创建一个简单的登录和注册系统,这没有给我任何错误,但控制台显示连接不成功的jar文件也被添加。这没有给我任何错误,但控制台显示连接不成功的jar文件也被添加。
控制台 msg
Connection unsuccessful
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
java.lang.NullPointerException
登录.jsp
<form action="sign" method="post" >
Enter User name : <input type="text" name="uname"><br>
Enter Password : <input type="text" name="pass"><br> <input
type="submit" name="submit" value="Login"> <a href = "signin.jsp">Register</a>
</form>
签到.jsp
<form action="sign" method="post">
Enter User name : <input type="text" name="uname"><br>
Enter Email : <input type="text" name="email"><br>
Enter Password : <input type="text" name="pass"><br>
Enter Confirm Password : <input type="text" name="pass2"><br>
<input type="submit" name="submit" value="Signup">
</form>
Impl.java
public User getUser(String username, String paswword) {
User u = new User();
try {
con = c.connect();
ps = con.prepareStatement("select * from signin where uname=? and pass=?");
ps.setString(1, username);
ps.setString(2, paswword);
ResultSet rs = ps.executeQuery();
while(rs.next()) {
u.setUsername(rs.getString(1));
u.setPassword(rs.getString(2));
}
} catch (Exception e) {
System.out.println(e);
}
return u;
}
配置.java
public Connection connect() {
Connection con = null;
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/jsp", "root", "");
System.out.println("Connection Successful");
} catch (Exception e) {
System.out.println("Connection unsuccessful");
System.out.println("" + e);
}
return con;
}
我得到的唯一错误是,插入命令没有执行,我需要添加蚂蚁的依赖关系吗?
你需要在你的lib文件夹中添加mysql-connector jar...
https:/repo1.maven.orgmaven2mysqlmysql-connector-java5.1.49mysql-connector-java-5.1.49.jar。
将上面的文件复制到你的lib目录下,然后重新启动服务器......