javaweb求助qwq

java链接数据库没有问题，加上servlet就出问题了

这是代表驱动版本不对吧？但我检查过mysql和驱动版本一致

以下为主要代码

servlet

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		HttpSession session=request.getSession();
		session.setAttribute("id",request.getParameter("id"));
		DBConnTools qwq=new DBConnTools();
		qwq.setId(session.getAttribute("id").toString());
		//System.out.println(session.getAttribute("id"));//验证
		try {
			qwq.connect();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		request.setAttribute("sno",qwq.getSno());
		request.setAttribute("name",qwq.getName());
		request.setAttribute("sex",qwq.getSex());
		request.setAttribute("birth",qwq.getBirth());
		request.setAttribute("dept",qwq.getDept());
		request.setAttribute("memo",qwq.getMemo());
		request.getRequestDispatcher("output.jsp").forward(request, response);
	}


}

javabean

public class DBConnTools {
	private String id;
	private String sno;
	private String name;
	private String sex;
	private String birth;
	private String dept;
	private String memo;
	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}

	public String getBirth() {
		return birth;
	}

	public void setBirth(String string) {
		this.birth = string;
	}

	public String getDept() {
		return dept;
	}

	public void setDept(String dept) {
		this.dept = dept;
	}

	public String getMemo() {
		return memo;
	}

	public void setMemo(String memo) {
		this.memo = memo;
	}

	public String getSno() {
		return sno;
	}

	public void setSno(String sno) {
		this.sno = sno;
	}

	public void connect()throws SQLException{
		Connection connection=null;
		Statement statement=null;
		try {
			//setId("0602001");
			Class.forName("com.mysql.cj.jdbc.Driver");
			String url="jdbc:mysql://localhost:3306/123?useUnicode=true&characterEncoding=utf-8&serverTimezone=GMT%2B8";
			String user="root";
			String password="22340266";
			connection=DriverManager.getConnection(url,user,password);
			statement=connection.createStatement();
			String sql="select * from student where sno="+getId()+"";
			ResultSet rs=statement.executeQuery(sql);
			while(rs.next()) {
				setSno(rs.getString(1));
				setName(rs.getString(2));
				setSex(rs.getString(3));
				setBirth(rs.getString(4));
				setDept(rs.getString(5));
				setMemo(rs.getString(6));
			}
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

jar包是什么版本的，有没有加到项目

debug会吗，跟一下代码就知道哪里有问题了

如果你确定你的已经放入了正确版本的 jar 包，但是还是提示 ClassNotFund，那么说明是 IDE 没有识别到你导入的包。你好像没有用 maven，所以你需要搜搜 eclipse 导入三方 jar 包。有时候不是你将 jar 包放到项目中，IDE 就知道你需要使用这个 jar 包。

jdbc驱动放到classpath下没

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