servlet jsp 搭建Demo 及传值一

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servlet jsp

纯属娱乐，高手勿喷

需求：用户登录login.jsp输入名字和密码后台校验，暂不考虑数据库

如果正确跳转到 success.jsp 并显示出名字密码

如果错误就跳转到fail.jsp 并打印一句提示信息！

环境：servlet + jsp

准备： 3个页面分别是login.jsp success.jsp fail.jsp

1个servlet loginServlet

再配置一个web.xml

下面看直接看代码吧直接拷贝即可运行不懂的可以加本人QQ交流

 <body>
   <form action="loginServlet" method="post">
		用户名：<input type="text" name="userName" />
		密码：<input type="password" name="password"/>
		<input type="submit" value="提交"/>
   </form>
  </body>

success.jsp

<body>
  ${usename}
  ${password}
</body>

fail.jsp

  <body>
   ${msg} <br>
  </body>

web.xml

<servlet>
    <servlet-name>loginServlet</servlet-name>
    <servlet-class>com.baidu.servlet.loginServlet</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>loginServlet</servlet-name>
    <url-pattern>/loginServlet</url-pattern>
  </servlet-mapping>

loginServlet

public class loginServlet extends HttpServlet {
	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doPost(request, response);
	}


	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String userName = request.getParameter("userName");
		String password = request.getParameter("password");
		
		if(userName!=null && password!=null){
			if(userName.equals("qq") && password.equals("5101437")){
				
				request.setAttribute("usename", userName);
				request.setAttribute("password", password);
				
				request.getRequestDispatcher("/success.jsp").forward(request, response);
				return;
			}
		}
		request.setAttribute("msg", "抱歉，用户名或密码错误");
		request.getRequestDispatcher("/fail.jsp").forward(request, response);
		return;
	}

}