找到原因了，accesstoken要用小程序的appid和密钥生成，而不是微信公众号的，另外accesstoken带在参数中，content要以json格式放在post请求的body中 public String test(String test) { // 第三方用户唯一凭证 String appId = miniProgramAppId // 第三方用户唯一凭证密钥 String appSecret = miniProgramSecret // 调用接口获取凭证 Token token = CommonUtil.getTokenminiProgramAppId, miniProgramSecret); System.out.println(token.getAccessToken()); JSONObject jsonObject = new JSONObject(); jsonObject.put("content", 志愿兵维权); String o="" try o = okHttpPost("https://api.weixin.qq.com/wxa/msg_sec_check?access_token="+token.getAccessToken(), jsonObject.toString()); } catch (Exception e) { e.printStackTrace(); } return o; public String okHttpPost(String url, String json){ OkHttpClient client = new OkHttpClient().newBuilder() .build(); MediaType mediaType = MediaType.parse"application/json"); okhttp3.RequestBody body = okhttp3.RequestBody.create(json,mediaType); Request request = new Request.Builder() .url(url) .method("POST", body) .addHeader("Content-Type", "application/json" .build(); try Response response = client.newCall(request).execute(); return response.body().string(); } catch (IOException e) { e.printStackTrace(); } return null ｝ dependency groupIdcom.squareup.okhttp3</groupId artifactIdokhttp</artifactId version4.2.2</version </dependency