servlet 應用舉例

在web.xml中添加：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
 xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
 http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>

//此處爲添加的內容
  <servlet>
    <servlet-name>login </servlet-name>//login爲自定義名字
    <servlet-class>com.bruce.serverlet.loginServer</servlet-class>//此處爲主函數類
  </servlet>
    <servlet-mapping>
      <servlet-name>login</servlet-name>
      <url-pattern>/loginserver</url-pattern> //此處爲在form中的action填的內容，自定義
    </servlet-mapping>
</web-app>

此方法爲登陸的主方法 繼承httpServlet,重寫其中的方法

public class loginServer extends HttpServlet {

 @Override
 protected void doGet(HttpServletRequest req, HttpServletResponse resp)
   throws ServletException, IOException {
    String name = req.getParameter("name");
    String pass = req.getParameter("pass");
  
    if(name.equals("name")&&pass.equals("123")){
        req.getRequestDispatcher("/pages/success.jsp").forward(req, resp);}
     else
      req.getRequestDispatcher("/pages/failed.jsp").forward(req, resp);
 }

 
}