java模拟PostMan 出现400错误

Question

java模拟PostMan 出现400错误，求大神指点一二

List<Map<String, Object>> paraMapsList = sqlMap.queryForList("wf_persontask.selectBillTimeOutRemind");
        List<Map<String, Object>> userList = paraMapsList;
        
        for (Map<String, Object> userListmap : userList) {
            userListmap.put("thirdUserId", userListmap.get("id"));
            userListmap.put("registerCode", "3001");
            userListmap.put("thirdLoginName", userListmap.get("ownername"));
            userListmap.put("thirdName", userListmap.get("name"));
            userListmap.put("thirdCode", userListmap.get("NO"));
            userListmap.put("thirdMobile", null);
            userListmap.put("thirdEmail", userListmap.get("EMAIL"));
            userListmap.remove("id");
            userListmap.remove("PROCESSNAME");
            userListmap.remove("name");
            userListmap.remove("assignee");
            userListmap.remove("EMAIL");
            userListmap.remove("NO");
            userListmap.remove("ownername");
            bindUSERPost(userListmap);
        }

public String bindUSERPost(Map<String, Object> userListmap) {
        JSONArray jsonArray = new JSONArray();
        jsonArray.add(userListmap);
        JSONObject object = new JSONObject();
        object.put("userlist", jsonArray);
        try {

            logger.info(object.toJSONString()+"---------------------------");
            URL realUrl = new URL(BINDIND);
            HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setUseCaches(false);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Charset", "UTF-8");
            conn.setRequestProperty("Content-Type", "application/json");
            conn.setRequestProperty("token", tokenID);
            conn.connect();
            DataOutputStream out =new DataOutputStream(conn.getOutputStream());
            out.write((jsonArray.toString()).getBytes());
            logger.info(conn.getResponseCode()+"请求返回的状态码");
            if (conn.getResponseCode() == 200) {
                logger.info("---------------请求成功-----------------");
                //请求返回的数据
                InputStream in = conn.getInputStream();
                byte[] datas = new byte[in.available()];
                in.read(datas);
                String msg = new String(datas);
            }else {
                logger.info("-------请求失误，请检查参数--------");
            }
            out.flush();
            out.close();
        } catch (Exception e) {
            logger.info("------------------------你有毒你有毒------------------");
        }
        return "";
    }

Answer 1

个人认为可以从下面几个方面入手排查

1. 确认url是否正确呢，请求的资源是否存在

2. 检查入参的参数是否完整，格式类型是否符合

3. 确认服务端是否正常，是否是对服务端异常的处理，重写了httpstatus

Answer 2

4XX错误 一般是请求方的错误
由于明显的客户端错误（例如，格式错误的请求语法，太大的大小，无效的请求消息或欺骗性路由请求），服务器不能或不会处理该请求。

建议楼主贴一下接口文档和报错信息