javaWeb前后台交互

package demo; /** * 这个类主要的功能是获取前端页面用户输入的用户名和密码 然后调用LoginSuccess方法进行用户名和密码与数据库中数据进行匹配 * 并进行跳转，用户名和密码正确跳转login_success.jsp，错误跳转login_failed.jsp */ import java.io.IOException; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; // 登录方法 public class loginServlet implements javax.servlet.Servlet { public void doPost(HttpServletRequest request, HttpServletResponse response) throws Exception { String username = request.getParameter("username");// 取得用户名 String password = request.getParameter("password");// 取得密码 System.out.println("取得用户名和密码"); LoginSuccess db = new LoginSuccess(); // 构建登陆对象 boolean canLogin = db.LoginSuccess(username, password);// 取得用户名和密码 if (canLogin) {// 根据登陆情况，跳转页面 System.out.println("用户名和密码正确"); response.sendRedirect("login_success.jsp"); } else { response.sendRedirect("login_failed.jsp"); System.out.println("用户名和密码错误"); } } public void destroy() { } public ServletConfig getServletConfig() { return null; } public String getServletInfo() { return null; } public void init(ServletConfig arg0) throws ServletException { } public void service(ServletRequest request, ServletResponse response) throws ServletException, IOException { HttpServletRequest rq = (HttpServletRequest) request; HttpServletResponse rs = (HttpServletResponse) response; try { doPost(rq, rs); } catch (Exception e) { e.printStackTrace(); } } }