String login = request.getParameter("loginname");
        String pass = request.getParameter("password");
        String tr = request.getParameter("truename");
        int grade =Integer.parseInt(request.getParameter("radiobutton"));
        Student student = new Student();
        student.setLoginName(login);
        student.setPassWord(pass);
        student.setTrueName(tr);
        student.setSemester(grade);
        StudentDao studentDao = new StudentDao();
            int row = studentDao.insert(student);
            if(row>0){
              out.print("添加成功!");
            }else{
            out.print("添加失败!!!");
            }

int row = studentDao.insert(student);老提示StudentDao 类中的insert的方法对student不适应
能帮忙解决下吗？？

让我们看看你的StudentDao的代码

package
import
import java.sql.SQLException;

public class StudentDao extends BaseDao{
    public int insert(){
        int a = 0;
        String sql = "insert into student values(?,?,?,?)";
        try {
            Student st = new Student();
            this.getConn();
            pstm = con.prepareStatement(sql);
            pstm.setString(1,st.getLoginName());
            pstm.setString(2,st.getPassWord());
            pstm.setString(3,st.getTrueName());
            pstm.setInt(4,st.getSemester());
            a = pstm.executeUpdate();
        } catch (SQLException e) {
            // TODO 自动生成 catch 块
            e.printStackTrace();
        }finally{
            this.closeAll();
        }
        return a;
        
    }

}

你的studentDao类中insert()没有参数的，调用时你用的是insert(student)

其实，Java连接数据库的例子，论坛、网上里有很多，我以前也在论坛发过。你找找！