public class TokenUtil {  
    private static Map<String, User> tokenMap = new HashMap<>();  
    public static String generateToken(User user){
        //生成唯一不重復(fù)的字符串
        String token = UUID.randomUUID().toString();
        tokenMap.put(token,user);
        return token;
    }
 
    /**
     * 驗(yàn)證token是否合法
     * @param token
     * @return
     */
    public static  boolean verify(String token){
        return tokenMap.containsKey(token);
    }
 
    public static User gentUser(String token){
        return tokenMap.get(token);
    }
 
    public static void main(String[] args) {
        for (int i = 0; i < 20; i++){
            System.out.println(UUID.randomUUID().toString());
        }
    } 
}

用戶登錄得UserController.java

@Api( tags = {"用戶模塊接口"})
@RestController
@RequestMapping("user")
public class UserController {
    @Autowired
    private UserService userService;
 
    @Autowired
    private HttpSession session;
    @ApiOperation("登錄接口")
    @RequestMapping(value = "login",method ={RequestMethod.POST,RequestMethod.GET})
    public Map<String,Object> login(User user){
        Map<String,Object> map = new HashMap<>();
        map.put("code",0);
        if(StringUtils.isEmpty(user.getUsername()) || StringUtils.isEmpty(user.getPassword()) ){
            map.put("msg","用戶或者密碼為空！");
            return map;
        }
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("username",user.getUsername())
                .eq("password",user.getPassword());
        User userDb = userService.getOne(queryWrapper);
        if(userDb != null){
            String token= TokenUtil.generateToken(userDb);
            map.put("code",1);
            map.put("data",userDb);
            map.put("token",token);
            session.setAttribute("username",userDb.getUsername());
        }else{
            map.put("msg","用戶名或密碼錯(cuò)誤！");
        }
        return map;
    }
    @ApiImplicitParams(
            {
            @ApiImplicitParam(name = "id",
                    value = "用戶id", required = true,
                    dataType = "Long"),
            @ApiImplicitParam(name = "name",
                    value = "測(cè)試名字",
                    dataType = "string")
            }
    )
    @ApiOperation("根據(jù)id查詢用戶信息")
    @RequestMapping(value="getById",method ={RequestMethod.POST,RequestMethod.GET})
    public  User getById(Long id ,String name){
        System.out.println(name);
        return userService.getById(id);
    }
 
}

在攔截器上操作 interceptor下面LoginInterceptor.java

public class LoginInterceptor implements HandlerInterceptor {
 
    @Autowired
    private HttpSession httpSession;
 
    //Controller邏輯執(zhí)行之前
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("preHandle....");
        String uri = request.getRequestURI();
        System.out.println("當(dāng)前路徑："+uri);
        /**
         * HandlerMethod=>Controller中標(biāo)注@RequestMapping的方法
         *  需要配置靜態(tài)資源不攔截時(shí)，添加這塊邏輯  => 前后端分離項(xiàng)目
         *
         */
        // 是我們的conrtoller中的方法
        if (!(handler instanceof HandlerMethod)) {
            return true;
        }
        String token = request.getHeader("qcby-token");
        if (!TokenUtil.verify(token)) {
            // 未登錄跳轉(zhuǎn)到登錄界面
           throw  new RuntimeException("no login!");
        } else {
            return true;
        }
    }
 
    //Controller邏輯執(zhí)行完畢但是視圖解析器還未進(jìn)行解析之前
    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle....");
    }
 
    //Controller邏輯和視圖解析器執(zhí)行完畢
    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        System.out.println("afterCompletion....");
    }
}