在一个简单的Web应用程序中,我可以使用过滤器检索用户(来自会话属性)并将其设置为所有servlet的参数:
内部过滤器:
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
checkUser((HttpServletRequest) request);
chain.doFilter(request, response);
}
private void checkUser(HttpServletRequest request) {
HttpSession session = request.getSession(false);
if (session != null) {
request.setAttribute("user", session.getAttribute("user"));
}
}
然后我可以在我的JSP文件(<c:if test="${not empty user}"> blablabla
)中使用它:
${user.getDisplayName}
在Spring应用程序中,我必须在每个Controller函数中注入principal。即使在这种情况下,Principal也不是User,因此我每次都需要使用UserService:
@Controller
@RequestMapping("/")
public class IndexController {
private final UserService userService;
@Autowired
IndexController(UserService userService) {
this.userService = userService;
}
private static final String VIEW = "index";
@RequestMapping(method = RequestMethod.GET)
ModelAndView index(Principal principal) {
User user = null;
if (principal != null) {
user = userService.findByUsername(principal.getName());
}
return new ModelAndView(VIEW, "user", user);
}
}
我需要用户(实体类)对象,因为它具有我使用的不同功能。例如。我用于导航栏的getDisplayName()
(在每个页面上):
用户类:
public String getDisplayName() {
if (firstname == null && lastname == null) {
return username;
}
if (firstname != null && lastname != null) {
return String.format("%s %s", firstname, lastname);
}
if (firstname != null) {
return firstname;
}
return lastname;
}
我无法使用安全标记库函数在Spring Framework中使用此特定用户函数(getDisplayName):
<security:authentication property="name"/> <%-- So, this is not what I am looking for --%>
好吧,我甚至尝试制作一个自定义拦截器并注册它(我不想做什么,因为我每次都要从数据库中读取我的用户)。但是我遇到了在拦截器内自动装配UserService的问题。
解决此问题的最佳方法是什么?是否有可能在成功登录后从数据库中找到User(findByUsername),然后将其放入会话中,然后制作某种拦截器,它可以执行与之前使用过滤器相同的操作,或者每次从数据库中检索用户页面,但避免这种狡猾的重复代码?
答案 0 :(得分:2)
您可以提供像
这样的登录成功处理程序http.formLogin().successHandler(new AuthenticationSuccessHandler() {
@Override
public void onAuthenticationSuccess(HttpServletRequest arg0,
HttpServletResponse arg1, Authentication arg2) throws IOException,
ServletException {
// here you can put your logic to save User object into session then forward/redirect to where ever you want
}
})
或者您可以将登录成功转发到某个终点,例如
http.formLogin().successForwardUrl("/loginsuccess")
并提供像
这样的endpont实现@RequestMapping({ "/loginsuccess" })
public ResponseEntity<?> loginSuccess(Principal user) {
// here you can put your logic to save User object into session then forward/redirect to where ever you want
return "";
}
选择您认为更方便的方式。
答案 1 :(得分:0)
<强>解决:强>
我制作了一个自定义拦截器,向其中注入了自动装配的用户服务,并注册了该自定义拦截器。它有效!
public class MyWebConfig extends WebMvcConfigurerAdapter {
@Bean
public UsernameInjectionInterceptor usernameInjectionInterceptor() {
return new UsernameInjectionInterceptor();
}
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(usernameInjectionInterceptor());
}
}
public class UsernameInjectionInterceptor extends HandlerInterceptorAdapter {
@Autowired
private UserService userService;
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response,
Object handler, ModelAndView modelAndView) throws Exception {
Principal principal = request.getUserPrincipal();
if (principal != null) {
HttpSession session = request.getSession(false);
if (session != null) {
String displayName = (String) session.getAttribute("displayName");
if (displayName == null) {
User user = userService.findByUsername(principal.getName());
if (user != null) {
displayName = user.getDisplayName();
session.setAttribute("displayName", displayName);
}
}
modelAndView.addObject("displayName", displayName);
}
}
}
}