1、创建一个工具类
@Component
public class ApplicationContextUtil extends ApplicationObjectSupport {
private static ApplicationContext instance;
public static ApplicationContext getContext() {
return instance;
}
@PostConstruct
private void init() {
instance = getApplicationContext();
}
}
2、Filter类
public class TokenFilter implements Filter {
private String excludedPage;
private String[] excludedPages;
@Override
public void init(FilterConfig filterConfig) throws ServletException {
excludedPage = filterConfig.getInitParameter("ignores");
if (excludedPage != null && excludedPage.length() > 0){
excludedPages = excludedPage.split(",");
}
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) servletRequest;
HttpServletResponse response = (HttpServletResponse) servletResponse;
String token = request.getParameter("token");
//获取service类
ApplicationContext context = ApplicationContextUtil.getContext();
UserService userService = context.getBean(UserService.class);
}
@Override
public void destroy() {
}
}
3、在Filter中将数据返回到客户端
ServletOutputStream out = response.getOutputStream();
out.println("0");