web.xml中的register部分如下：

  RegisterServlet
    servlet.RegisterServlet
   
  
     RegisterServlet
     /registerServlet
  

Register.java代码段如下

public class RegisterServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    request.setCharacterEncoding("gb2312");
    response.setContentType("gb2312");

    String username = request.getParameter("username");
    String pwd = request.getParameter("pwd");

    if(new DB().insertUser(username, pwd)){
        response.sendRedirect("login.jsp");
    }
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    doGet(request, response);
}

运行之后，浏览器没啥反应，我估计是Register.java中的if判断语句出现了问题，于是我添加了如下代码：

        if(new DB().insertUser(username, pwd)){
        response.sendRedirect("login.jsp");
    }else{
        response.sendRedirect("success.jsp");
    }

果然返回了success.jsp界面。 其中register.jsp代码段如下：

    

    

    
register
    

      
name:
      

    
    

      
Password:
      

    
    
    

其中DB.java的数据库连接代码段如下：

    Connection con;
PreparedStatement pstmt;
public DB(){
    String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
    String url = "jdbc:sqlserver://localhost:1433; DatabaseName=JSP"; 
    String username = "load";
    String password = "hww";
    //加载驱动程序以连接数据库
    try {
        Class.forName(driverName); 
        con = DriverManager.getConnection(url, username, password);
    }
    //捕获加载驱动程序异常
    catch (ClassNotFoundException e){
        System.err.println("加载JDBC/ODBC驱动程序失败。");
        e.printStackTrace();
        System.exit(1);
    }
    //捕获连接数据库异常
    catch (SQLException e){
        System.err.println("无法连接数据库");
        e.printStackTrace();
        System.exit(1);
    }
}

判断是否添加注册用户的代码段如下：

    public boolean insertUser(String username,String pwd){
    try{
        pstmt = con.prepareStatement("insert into[userTable]values(?,?)");
        pstmt.setString(1, username);
        pstmt.setString(2, pwd);
        pstmt.executeUpdate();
        return true;
    }catch(Exception e){
        e.printStackTrace();
        return false;
    }
}

请问在哪里出错了，搞不明白。谢谢。