ServletMVC_java_servlet_jsp_源码

package renxuan.MVC.controller; import java.io.IOException; import javax.servlet.Servlet; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import renxuan.MVC.entity.User; import renxuan.MVC.service.IUserService; import renxuan.MVC.service.UserServiceImpl; @WebServlet("/RegisterServlet") public class RegisterServlet extends HttpServlet{ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //获取前台页面输入的数据 String username = request.getParameter("username"); String pass = request.getParameter("password"); String message="";//提示信息 User user = new User(username,pass);//实例化注册对象，并传入参数 System.out.println(username+"="+pass); IUserService userService = new UserServiceImpl(); HttpSession session=request.getSession();//创建一个session会话，获取当前会话 //判断注册方法是否返回结果是否为true boolean success=false; try { success=userService.registerUser(user); } catch (Exception e) { if (e.getCause().getCause() instanceof com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException) {//是否是重复添加的异常 message = "用户名重复！";//首先验证用户是否唯一 session.setAttribute("message", message); response.sendRedirect("register_fail.jsp"); }else { message = "注册失败,请重新注册！"; session.setAttribute("message", message); response.sendRedirect("register_fail.jsp"); } } if(success) { message = "注册成功！"; session.setAttribute("message", message);//设置提示信息内容 response.sendRedirect("register_succeed.jsp");//重定向至信息提示页面 }else { message = "注册失败,请重新注册！"; session.setAttribute("message", message); response.sendRedirect("register_fail.jsp"); } } }