servlet的使用

Servlet是比较基础的的客户端与服务器数据交互程序，通过HttpServletRequest请求和HttpServletResponse响应，可以基本实现web程序开发。

1、Servlet基础代码

public class choServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

String name="hello";

response.setContentType("text/html;charset=utf-8");

//传值

request.getSession().setAttribute("name", name);
/*request.setAttribute("name", name);*/

//返回页面 转发

RequestDispatcher d = request.getRequestDispatcher("/WEB-INF/jsp/chomod.jsp");

d.forward(request,response);
}

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

2.web.xml配置

<servlet>
<servlet-name>choServlet</servlet-name>
<servlet-class>valid.servlet.choServlet</servlet-class>
</servlet>

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

3.jsp获取显示

<div>${name}</div>
<%-- <div><%=session.getAttribute("name") %></div> --%>

以上就可以简单实现后台与前端的数据交互