javaweb过滤器与器_java过滤器配置_java器怎么写(6)

import cn.itcast.service.UserService;

importcn.itcast.service.impl.UserServiceImpl;

publicclass AutologinFilter implements Filter{

@Override

publicvoid destroy() {

}

@Override

publicvoid doFilter(ServletRequest request, ServletResponse response,

FilterChain chain) throws IOException, ServletException {

//第一步： 获取数据 （cookie username password）

//HttpServletRequest?

HttpServletRequest req = (HttpServletRequest)request;

HttpServletResponse res = (HttpServletResponse)response;

Cookie[] cookies = req.getCookies();

if(cookies == null){

res.sendRedirect(req.getContextPath()+"/login.jsp");

return;

}else{

//将cookie中的username和password

String username = "";

String password = "";

for (Cookie cookie : cookies) {

if("username".equals(cookie.getName())){

username = URLDecoder.decode(cookie.getValue(), "utf-8") ;

}

if("password".equals(cookie.getName())){

password = cookie.getValue();

}

}

if(username.equals("") || password.equals("")){

res.sendRedirect(req.getContextPath()+"/login.jsp");

return;

}else{

//第二步：调用方法（UserService.login()）

UserService userService = newUserServiceImpl();

User loginUser = userService.login(username, password);

//第三步：根局不同返回值，不同处理

if(loginUser == null){

res.sendRedirect(req.getContextPath()+"/login.jsp");

return;

}else{

req.getSession().setAttribute("loginUser", loginUser);

res.sendRedirect(req.getContextPath()+"/queryPage2?pageNum=1");

return;

}

}

}

}

@Override

publicvoid init(FilterConfig arg0) throws ServletException {

}

}

web.xml配置：

<!-- =======================过滤器配置=============================== -->

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