springBoot框架下WrappedRequest重写request body请求参数

1.需求

请求接口要认证token，认证成功正常调用接口

2.使用 HttpServletRequestWrapper重写

public class WrappedRequest extends  HttpServletRequestWrapper {

    private static final Logger log = LoggerFactory.getLogger(WrappedRequest.class);

    private String mBody;        

    public WrappedRequest(HttpServletRequest request) throws IOException {
        super(request);
        this.mBody = this.getBody(request);
    }

    public static String convertStreamToString(InputStream is) {
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();

        try {
            String line;
            try {
                while((line = reader.readLine()) != null) {
                    sb.append(line + "n");
                }
            } catch (IOException var13) {
                log.error("IOException", var13);
            }
        } finally {
            try {
                is.close();
            } catch (IOException var12) {
                log.error("IOException", var12);
            }

        }

        return sb.toString();
    }

    private String getBody(HttpServletRequest request)  throws IOException{
        return convertStreamToString(request.getInputStream());
    }

    public String getBody() {
        return this.mBody;
    }

    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(this.getInputStream()));
    }

    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream bais = new ByteArrayInputStream(this.mBody.getBytes(Charset.defaultCharset()));
        return new ServletInputStream() {
            public boolean isFinished() {
                return false;
            }

            public boolean isReady() {
                return false;
            }

            public void setReadListener(ReadListener readListener) {
            }

            public int read() throws IOException {
                return bais.read();
            }
        };
    }

 3.新增Filter

@Component
public class LoginFilter implements Filter {

    @Resource
    private RedisService redisService;

    
    private static final String[] anon_uris = new String[]{
            "/unified/login",
            "/unified/logout"
    };

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //忽略掉匿名的路径
        if(ServletUtils.requestUriMatch(anon_uris, request)){
            filterChain.doFilter(request, response);
            return;
        }

        WrappedRequest myRequestWrapper = new WrappedRequest(request);

        //校验 token
        if(!validToken(myRequestWrapper, response))
            return;

        //继续往下执行
      if (myRequestWrapper == null) {
         filterChain.doFilter(servletRequest, servletResponse);
      }else{
         filterChain.doFilter(myRequestWrapper, servletResponse);
      }
    }

    
   private boolean validToken(WrappedRequest myRequestWrapper, HttpServletResponse response) throws IOException {

      String param = myRequestWrapper.getBody();

      System.out.println(param);

      HashMap hashMap = JSON.parseObject(param, HashMap.class);

      //获取 token
      String token = EmptyUtil.isNotEmpty(hashMap.get("token")) ? hashMap.get("token").toString() : null;
      //获取 userId
      String userId = EmptyUtil.isNotEmpty(hashMap.get("userId")) ? hashMap.get("userId").toString() : null;
      //校验token参数
      if(EmptyUtil.isEmpty(token)) {
         ret(response, R.noToken().toJson());
         return false;
      }
      if(EmptyUtil.isEmpty(userId)) {
         ret(response, R.noUserId().toJson());
         return false;
      }
      //校验userId对应token
      String userLoginKey = "umpsLogin:" + userId;
      String userRedisToken = EmptyUtil.isEmpty(redisService.get(userLoginKey)) ? null : redisService.get(userLoginKey).toString();
      if(EmptyUtil.isEmpty(userRedisToken)){
         ret(response, R.noLogin().toJson());
         return false;
      }
      if(!userRedisToken.equals(token)){
         ret(response, R.noPerm().toJson());
         return false;
      }

      //从 Redis 中获取用户信息
      String userJson = redisService.get(token).toString();
      if(userJson == null){
         ret(response, R.noLogin().toJson());
         return false;
      }

      //获取过期时间，与 token 过期时间保持一致
      Long timeout = 21600l;

      //重置过期时间，单位为 “秒”
      redisService.expire(userId.toString(), timeout); //刷新 userId 的缓存时间
      redisService.expire(token, timeout); //刷新 token 的缓存时间

      return true;
   }

    public void ret(HttpServletResponse response, String body) throws IOException {
        response.setContentType("application/json; charset=utf-8");
        response.getWriter().println(body);
    }


}