public class TokenInterceptor implements Interceptor {  @Override  public Response intercept(Chain chain) throws IOException {    Request.Builder request = chain.request().newBuilder();    //添加默認的Token請求頭    request.addHeader("Cookie", UserInfo.getInstance().getPhpSessionId());    Response proceed = chain.proceed(request.build());    okhttp3.MediaType mediaType = proceed.body().contentType();    //如果token過期 再去重新請求token 然后設置token的請求頭 重新發起請求 用戶無感    String content = proceed.body().string();    if (isTokenExpired(content)) {      String newToken = getNewToken();      UserInfo.getInstance().setPhpSessionId(newToken);      //使用新的Token，創建新的請求      Request newRequest = chain.request().newBuilder()          .addHeader("Cookie", newToken)          .build();      return chain.proceed(newRequest);    }    return proceed.newBuilder()        .body(okhttp3.ResponseBody.create(mediaType, content))        .build();  }  private String getNewToken() {    // 通過一個特定的接口獲取新的token，此處要用到同步的retrofit請求    IndexService service = IndexService.Builder.getServer();    Call<BaseObjResult<UserBean>> call = service.getToke(        UserInfo.getInstance().getPhone(),        UserInfo.getInstance().getPwd(),        0);    //要用retrofit的同步方式    BaseObjResult<UserBean> newToken = null;    try {      newToken = call.execute().body();    } catch (IOException e) {      e.printStackTrace();    }    return newToken.getResult().getPHPSESSID();  }  /**   * 根據Response，判斷Token是否失效   *   * @return   */  private boolean isTokenExpired(String resultStr) {    RequestCode requestCode = new Gson().fromJson(resultStr, RequestCode.class);    //err==3 token過期    if (requestCode.getErr() == 3) {      LogUtils.e("Token登錄過期了");      ToastUtils.showShortSafe("Token登錄過期了");      return true;    }    return false;  }  class RequestCode {    private int err;    private String msg;    public int getErr() {      return err;    }    public void setErr(int err) {      this.err = err;    }    public String getMsg() {      return msg;    }    public void setMsg(String msg) {      this.msg = msg;    }  }}

okBuilder.addInterceptor(new TokenInterceptor()); //請求過期更換token