login.jsp
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>Login Page</title>
</head>
<body>
<%@ include file="login_form.jsp" %>
</body>
</html>
被包含的login_form.jsp
<%@ taglib uri="utilities" prefix="util" %>
<!--调用自定义标签，引用为util，uri的utilities在web.xml映射了-->
<p><font color="#6666CC">请登陆</font></p>
<hr>
<form name="form1" method="post" action="<%=response.encodeURL("login")%>"><!--login是LoginSevlet通过在web.xml映射了-->
<table width="68%" border="0" cellpadding="2" cellspacing="2">
<tr>
<td width="33%" align="right">用户名：</td>
<td width="67%">
<input type="text" name="userName" value="<util:requestParameter property='userName'/>"></td><!--注意这里用了自定义标签，如果有值就显示-->
</tr>
<tr>
<td align="right">密码：</td>
<td><input type="text" name="userPwd" ></td>
</tr>
<tr align="center">
<td colspan="2">
<input type="submit" name="Submit" value="登陆">
</td>
</tr>
</table>
</form>
LoginServlet.java
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.IOException;
import beans.User;
import beans.LoginDB;
public class LoginServlet extends HttpServlet {
private LoginDB loginDB;
public void init(ServletConfig config) throws ServletException {
super.init(config);
loginDB = new LoginDB();
config.getServletContext().setAttribute("loginDB",loginDB);
}
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException,IOException{
String name = request.getParameter("userName"); //从login_form 表单得到值
String pwd = request.getParameter("userPwd");
User user = loginDB.getUser(name,pwd);
if(user != null){ //说明存在用户
request.getSession().setAttribute("user",user); //放到session 里面
request.getRequestDispatcher(response.encodeURL("/welcome.jsp")).forward(request,response); //成功转发到welcome.jsp
}else{
request.getRequestDispatcher(response.encodeURL("/loginFailed.jsp")).forward(request, response);
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException,IOException{
doGet(request,response);
}
}
web.xml添加
<servlet>
<servlet-name>Login</servlet-name> <!--名字-->
<servlet-class>LoginServlet</servlet-class> <!--指定类-->
</servlet><servlet>
<servlet-name>new_account</servlet-name>
<servlet-class>NewAccountServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>new_account</servlet-name>
<url-pattern>/new_account</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>Login</servlet-name> <!--和上面的名字一致-->
<url-pattern>/login</url-pattern> <!--映射路径-->
</servlet-mapping>
<taglib>
<taglib-uri>utilities</taglib-uri>
<taglib-location>/WEB-INF/tlds/utilities.tld</taglib-location>
<!--自定义标签的实际位置-->
</taglib>
utilities.tld关键部分
<taglib>
<tag>
<name>requestParameter</name>
<tagclass>tags.GetRequestParameterTag</tagclass>
<!--类的位置，如果有包写上-->
<info>Simplest example: inserts one line of output</info>
<bodycontent>Empty</bodycontent>
<attribute>
<name>property</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>
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