1.没有连接数据库
login.jsp <body> <h2>用户登录页面</h2> <form action="" method="post"> <table border="1"> 边框为1 <tr> <td>账号</td> <td><input type="text",name="name"/></td> </tr> <tr> <td>密码</td> <td><input type="password",name="pass"/></td> </tr> <tr> 合并 <td colspan="2"><input type="submit",value="登录"/></td> </tr> <table> </form> </body> com.feicui.controller包 public class LoginServlet extends HTTPServlet{ @Override public void dopost(HttpServletRequest request， HTTPServletResponse response){ String name=request.getParameter("name"); String pass=request.getParameter("pass"); System.out.println("账号:"+name+",密码:"+pass); if("admin".equals(name)&&"123".equals(pass)){ System.out.println("登录成功！"); response.sendRedirect("index.jsp"); }else{ System.out.println("登录失败！"); response.sendRedirect("login.jsp"); } } } web.xml <servlet> <servlet-name>login</servlet-name> <servlet-class>LoginServlet的路径</servlet-class> </servlet> <servlet-mapping> <servlet-name>login</servlet-name> <url-pattern>/login</url-pattern> </servlet-mapping> login.jsp <body> <h2>用户登录页面</h2> <form action="" method="post"> <table border="1"> 边框为1 <tr> <td>账号</td> <td><input type="text",name="name"/></td> </tr> <tr> <td>密码</td> <td><input type="password",name="pass"/></td> </tr> <tr> 合并 <td colspan="2"><input type="submit",value="登录"/></td> </tr> <table> </form> </body> com.feicui.controller包 public class LoginServlet extends HTTPServlet{ @Override public void dopost(HttpServletRequest request， HTTPServletResponse response){ String name=request.getParameter("name"); String pass=request.getParameter("pass"); System.out.println("账号:"+name+",密码:"+pass); if("admin".equals(name)&&"123".equals(pass)){ System.out.println("登录成功！"); response.sendRedirect("index.jsp"); }else{ System.out.println("登录失败！"); response.sendRedirect("login.jsp"); } } } web.xml <servlet> <servlet-name>login</servlet-name> <servlet-class>LoginServlet的路径</servlet-class> </servlet> <servlet-mapping> <servlet-name>login</servlet-name> <url-pattern>/login</url-pattern> </servlet-mapping> 文章来源: 在javaEE中用表格做的登录页面。