SpringBoot實現(xiàn)登錄攔截器
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1、SpringBoot實現(xiàn)登錄攔截的原理
1.1、實現(xiàn)HandlerInterceptor接口
package blog.interceptor;
import blog.entity.User;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class UserLoginInterceptor implements HandlerInterceptor {
/***
* 在請求處理之前進行調用(Controller方法調用之前)
*/
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("執(zhí)行了攔截器的preHandle方法");
try {
HttpSession session = request.getSession();
//統(tǒng)一攔截（查詢當前session是否存在user）(這里user會在每次登錄成功后，寫入session)
User user = (User) session.getAttribute("user");
if (user != null) {
return true;
}
response.sendRedirect(request.getContextPath() + "login");
} catch (Exception e) {
e.printStackTrace();
}
return false;
//如果設置為false時，被請求時，攔截器執(zhí)行到此處將不會繼續(xù)操作
//如果設置為true時，請求將會繼續(xù)執(zhí)行后面的操作
}
/***
* 請求處理之后進行調用，但是在視圖被渲染之前（Controller方法調用之后）
*/
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("執(zhí)行了攔截器的postHandle方法");
}
/***
* 整個請求結束之后被調用，也就是在DispatchServlet渲染了對應的視圖之后執(zhí)行（主要用于進行資源清理工作）
*/
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("執(zhí)行了攔截器的afterCompletion方法");
}
}
1.2、實現(xiàn)WebMvcConfigurer接口，注冊攔截器
package blog.config;
import blog.interceptor.UserLoginInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class LoginConfig implements WebMvcConfigurer {
@Override
public void addInterceptors(InterceptorRegistry registry) {
//注冊TestInterceptor攔截器
InterceptorRegistration registration = registry.addInterceptor(new UserLoginInterceptor());
registration.addPathPatterns("/**"); //所有路徑都被攔截
registration.excludePathPatterns( //添加不攔截路徑
"/login", //登錄路徑
"/**/*.html", //html靜態(tài)資源
"/**/*.js", //js靜態(tài)資源
"/**/*.css" //css靜態(tài)資源
);
}
}
1.3、保持登錄狀態(tài)
@RequestMapping(value = {"", "/", "/index"}, method = RequestMethod.GET)
public String index(Model model, HttpServletRequest request) {
User user = (User) request.getSession().getAttribute("user");
model.addAttribute("user", user);
return "users/index";
}
@RequestMapping(value = {"/login"}, method = RequestMethod.GET)
public String loginIndex() {
return "users/login";
}
@RequestMapping(value = {"/login"}, method = RequestMethod.POST)
public String login(@RequestParam(name = "username")String username, @RequestParam(name = "password")String password,
Model model, HttpServletRequest request) {
User user = userService.getPwdByUsername(username);
String pwd = user.getPassword();
String password1 = MD5Utils.md5Code(password).toUpperCase();
String password2 = MD5Utils.md5Code(password1).toUpperCase();
if (pwd.equals(password2)) {
model.addAttribute("user", user);
request.getSession().setAttribute("user", user);
return "redirect:/index";
} else {
return "users/failed";
}
}
2、代碼實現(xiàn)及示例
3、效果驗證
3.1、訪問localhost:8081/index頁面：
3.2、正確輸入用戶名和密碼登錄
3.3、再次訪問localhost:8081/index
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本文鏈接：
https://blog.csdn.net/qq_27198345/article/details/111401610
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