SpringBoot通过ThreadLocal实现登录拦截详解流程

package com.liubujun.config;
import com.liubujun.moudle.UserToken;
import com.liubujun.util.SecurityContextUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.ws.handler.Handler;
import java.io.IOException;
/**
 * @Author: liubujun
 * @Date: 2022/5/21 16:12
 */
@Component
@Slf4j
public class HeadTokenInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String authorization = request.getHeader("Authorization");
        if (authorization == null ) {
            unauthorized(response);
            return false;
        }
        //这里一般都会解析出userToken的值，这里为了方便就直接new了
        UserToken userToken  = new UserToken();
        SecurityContextUtil.addUser(userToken);
        return false;
    }
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        SecurityContextUtil.removeUser();
    }
    private void unauthorized(HttpServletResponse response) {
        response.setStatus(HttpStatus.UNAUTHORIZED.value());
        try {
            response.getWriter().append(HttpStatus.UNAUTHORIZED.getReasonPhrase());
        } catch (IOException e) {
            log.error("HttpServletResponse writer error.msg",HttpStatus.UNAUTHORIZED.getReasonPhrase());
            log.error(e.getMessage(),e);
        }
    }
}

package com.liubujun.config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import java.util.ArrayList;
/**
 * @Author: liubujun
 * @Date: 2022/5/21 16:40
 */
@Configuration
public class MyWebMvcConfigurer extends WebMvcConfigurationSupport {
    @Autowired
    private HeadTokenInterceptor headTokenInterceptor;
    /**
     * 类似于白名单，在这边添加的请求不会走拦截器
     * @param registry
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        ArrayList<String> pattres = new ArrayList<>();
        pattres.add("/login/login");
        registry.addInterceptor(headTokenInterceptor).excludePathPatterns(pattres).addPathPatterns("/**");
        super.addInterceptors(registry);
    }
    /**
     * 添加静态资源
     * @param registry
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("xxx.html")
                .addResourceLocations("classpath:/META-INF/resources");
        super.addResourceHandlers(registry);
    }
}

package com.liubujun.util;
import com.liubujun.moudle.UserToken;
import org.springframework.core.NamedThreadLocal;
/**
 * @Author: liubujun
 * @Date: 2022/5/23 9:41
 */
public class SecurityContextUtil {
    private static ThreadLocal<UserToken> threadLocal = new NamedThreadLocal<>("user");
    public static void addUser(UserToken user){
        threadLocal.set(user);
    }
    public static UserToken getUser(){
        return threadLocal.get();
    }
    public static void removeUser(){
        threadLocal.remove();
    }
    public static String getPhoneNumber(){
        return threadLocal.get().getPhoneNumber();
    }
    public static Integer getId(){
        return threadLocal.get().getId();
    }
    public static String getUserText(){
        return threadLocal.get().getUserText();
    }
}

@RestController
@RequestMapping(value = "/login",produces = {"application/json;charset=UTF-8"})
public class Login {
    @PostMapping("/login")
    public String login(){
        return "登录请求不需要拦截";
    }
    @PostMapping("/other")
    public String other(){
        return "其他的请求需要拦截";
    }
}