日期:2014-05-17 浏览次数:20718 次
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<head>
</head>
<body>
<form action="servlet/LoginServlet" method="post">
<input type="text" name="username"/><br/>
<input type="password" name="password"/><br/>
<input type="submit" value="登录"/>
</form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<head>
</head>
<body>登录成功!
</body>
</html>
<filter>
<filter-name>LoginFilter</filter-name>
<filter-class>filter.LoginFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>LoginFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<servlet>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>servlet.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/servlet/LoginServlet</url-pattern>
</servlet-mapping>
public class LoginServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
public String notNull(String param) {
return param == null ? "" : param;
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
HttpSession session = request.getSession();
String username = request.getParameter("username");
String password = request.getParameter("password");
System.out.println("username:"+username);
System.out.println("password:"+password);
if (username.equals("douya0808") && password.equals("123456")) {// 直接给xxxxLoginTest/servlet/LoginServlet会由于没传值而报出NullPointer
System.out.println("信息正确,跳转页面中...");
session.setAttribute("login", "LoginSuccess!");
response.sendRedirect(request.getContextPath() + "/success.jsp");
} else {
response.sendRedirect(request.getContextPath() + "/login.jsp");
}
}
}
public class LoginFilter implements Filter {
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("过滤器初始化中...");
}
public void destroy() {
}
public void doFilter(ServletRequest request,&n