过滤器提示未登录
2022/2/16 23:43:48
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package net.xdclass.demoproject.filter; import com.fasterxml.jackson.databind.ObjectMapper; import net.xdclass.demoproject.domain.User; import net.xdclass.demoproject.service.impl.UserServiceImpl; import net.xdclass.demoproject.utils.JsonData; import org.springframework.util.StringUtils; import javax.servlet.*; import javax.servlet.annotation.WebFilter; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.io.PrintWriter; //@WebFilter(urlPatterns = "/api/v1/pri/*", filterName = "loginFilter") public class LoginFilter implements Filter { private static final ObjectMapper objectMapper = new ObjectMapper(); /** * 容器加载的时候 * @param filterConfig * @throws ServletException */ @Override public void init(FilterConfig filterConfig) throws ServletException { System.out.println("init LoginFilter======"); } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { System.out.println("doFilter LoginFilter======"); HttpServletRequest req = (HttpServletRequest) servletRequest; HttpServletResponse resp = (HttpServletResponse) servletResponse; //先从请求头里拿token,没有的话就从请求参数里面拿 String token = req.getHeader("token"); if(StringUtils.isEmpty(token)){ token = req.getParameter("token"); } if(!StringUtils.isEmpty(token)){ //判断token是否合法 User user = UserServiceImpl.sessionMap.get(token); if(user!=null){ filterChain.doFilter(servletRequest,servletResponse); }else { JsonData jsonData = JsonData.buildError("登录失败,token无效",-2); String jsonStr = objectMapper.writeValueAsString(jsonData); renderJson(resp,jsonStr); } }else { JsonData jsonData = JsonData.buildError("未登录",-3); String jsonStr = objectMapper.writeValueAsString(jsonData); renderJson(resp,jsonStr); } } private void renderJson(HttpServletResponse response,String json){ response.setCharacterEncoding("UTF-8"); response.setContentType("application/json"); try(PrintWriter writer = response.getWriter()){ writer.print(json); }catch (Exception e){ e.printStackTrace(); } } /** * 容器销毁的时候 */ @Override public void destroy() { System.out.println("destroy LoginFilter======"); } }
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