• java 调用第三方系统时的连接代码-记录


    前言:该文章主要是总结我在实际工作中遇到的问题,在调取第三方系统的时候出现的问题,算自己的总结。各位博友如果有什么建议或意见欢迎留言指正。

    1. 先将准备传入参数
    2. 再与第三方系统建立连接
    3. 再第三方系统处理后给你返回需要的信息

    调用第三方的系统的url(restful风格) 
    http://Ip地址:端口号/casereview/api/addTCaseReview

    在业务逻辑实现类中通过工具类调用第三方接口。 
    String postParam = “”; //传入参数 
    String url = “”; //第三方接口url 
    long timeOut = 20000; //超时时间 
    JSONObject response = CaseEvaluationUtil.sendPost(postParam, url, timeOut ); 
    //可以通过读取配置文件获取第三方接口地址 
    private static final String EVALUATION_IP = (String) ConcurrentCache.getFieldValue(“evaluationIp”);

    通过工具类进行与第三方接口连接交互。 
    这里写图片描述
    输出的参数 
    这里写图片描述 
    下面代码中设置请求头的信息来源于Request Headers

    /**
         * @description 向合议庭评议系统发送post请求
         * @author junbao
         * @create 2017年11月13日下午3:22:56
         * @version 1.0
         * @param postParam
         * @param url
         * @return String
         * @throws BusinessErrorException
         */
        public static JSONObject sendPost(String postParam, String url, int timeout) throws BusinessErrorException {
            JSONObject result = new JSONObject();
            PrintWriter out = null;
            BufferedReader in = null;
            try {
                if (StringUtils.isBlank(EVALUATION_IP)) {
                    throw new BusinessErrorException(CommonConstants.FAILURE, "EVALUATION_IP 不能为空");    
                }
                String targetURL = "http://" + EVALUATION_IP  + url;
                URL resetServiceURL = new URL(targetURL);
                //打开url连接
                HttpURLConnection httpConnection = (HttpURLConnection) resetServiceURL.openConnection();
                //设置连接请求头信息属性       
                httpConnection.setRequestProperty("Accept", "application/json, text/javascript, */*; q=0.01");
                httpConnection.setRequestProperty("Accept-Encoding", "gzip, deflate");
                httpConnection.setRequestProperty("Accept-Language", "zh-CN,zh;q=0.9");
                httpConnection.setRequestProperty("Connection", "keep-alive");
                httpConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
                httpConnection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36");
                httpConnection.setRequestProperty("X-Requested-With", "XMLHttpRequest");
                //设置超时时间
                httpConnection.setConnectTimeout(timeout);
                httpConnection.setReadTimeout(timeout);
                //设置请求方式
                httpConnection.setRequestMethod("POST");
                httpConnection.setDoInput(true);
                httpConnection.setDoOutput(true);
                //POST请求不应该使用cache
                httpConnection.setUseCaches(false);
                //获取url连接
                httpConnection.connect();
                //获取UrlConnection对象的输出流,调用httpConnection.getOutputStream的时候就会设置为POST方法
                out = new PrintWriter(new OutputStreamWriter(httpConnection.getOutputStream(),"UTF-8"));
                out.write(postParam);
                //flush输出流的缓冲,将参数发送出去
                out.flush();
                //表示连接异常
                if (httpConnection.getResponseCode() != 200) {
                    result.put("message", "数据获取异常,请联系系统管理员");
                    result.put("result", "ERROR");
                    result.put("code", null);
                    result.put("object", null);
                    return result;
                }
                //读取流中的内容
                in = new BufferedReader(new InputStreamReader(httpConnection.getInputStream(), "UTF-8"));
                String line = "";
                StringBuffer bf = new StringBuffer();
                while (null !=(line = in.readLine())) {
                    bf.append(line);
                }
    
                if (StringUtils.isNoneBlank(bf.toString())) {
                    JSONObject evalutionResult = JSONObject.parseObject(bf.toString());
                    return evalutionResult;
                }
            } catch (Exception e) {
                logger.error("Send post Exection!",e);
                result.put("message", "数据获取异常,请联系系统管理员");
                result.put("result", "ERROR");
                result.put("code", null);
                result.put("object", null);
                return result;
            } finally {
                // 关闭流
                try {
                    if (null != out) {
                        out.close();
                    }
                    if (null != in) {
                        in.close();
                    }
                } catch (Exception e) {
                    logger.info("Send post Exection!");
                    e.printStackTrace();
                    result.put("message", "数据获取异常,请联系系统管理员");
                    result.put("result", "ERROR");
                    result.put("code", null);
                    result.put("object", null);
                    return result;
                }
            }
            return result;
        }
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  • 原文地址:https://www.cnblogs.com/huangwentian/p/9474493.html
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