新闻发布项目——Servlet类（doRegServlet ）

package bdqn.newsManageServlet.Servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import bdqn.newsManageServlet.Dao.UserDao;
import bdqn.newsManageServlet.Dao.Impl.UserDaoImpl;
import bdqn.newsManageServlet.entity.User;
public class doRegServlet extends HttpServlet {
  /**
   * Destruction of the servlet. <br>
   */
  public void destroy() {
    super.destroy(); // Just puts "destroy" string in log
    // Put your code here
  }
  /**
   * The doGet method of the servlet. <br>
   *
   * This method is called when a form has its tag value method equals to get.
   * 
   * @param request the request send by the client to the server
   * @param response the response send by the server to the client
   * @throws ServletException if an error occurred
   * @throws IOException if an error occurred
   */
  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    response.setContentType("text/html;charset=utf-8");
    PrintWriter out = response.getWriter();
    request.setCharacterEncoding("utf-8");
    //获取注册用户信息
    request.setCharacterEncoding("utf-8");
    String name=request.getParameter("userName");
    String pwd=request.getParameter("password");
    if(name==null||name.equals("")){
    //保存错误信息
      request.setAttribute("uerrmsg","用户名不能为空" );
      request.getRequestDispatcher("reg.jsp").forward(request, response);
      return;
    }else if(pwd==null||pwd.equals("")){
      //保存错误信息
      request.setAttribute("pwderrmsg","密码不能为空" );
      request.getRequestDispatcher("reg.jsp").forward(request, response);
      return;
    }else{
    //将用户信息添加到数据库中
      UserDao udao=new UserDaoImpl();
      User user=new User();
      user.setUserName(name);
      user.setUserPassword(pwd);
      int rel=udao.addUser(user);
      if(rel>0){
        out.print("<script>alert('注册成功！');location.href='./index.jsp';</script>");
      }else{
        out.print("<script>alert('注册失败！');location.href='./reg.jsp';</script>");
      }
    }
  }
  
  public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    doGet(request, response);
  }
  /**
   * Initialization of the servlet. <br>
   *
   * @throws ServletException if an error occurs
   */
  public void init() throws ServletException {
    // Put your code here
  }
}