private String getCaptcha() { GeetestLib geetest = new GeetestLib(GeetestConfig.privateKey, GeetestConfig.publicKey); String resStr = ""; if (geetest.preProcess()) { resStr = geetest.getSuccessPreProcessRes(); geetest.setGtServerStatusSession(Session, 1); } else { resStr = geetest.getFailPreProcessRes(); geetest.setGtServerStatusSession(Session, 0); } return resStr; }