httpclient get与post样例与常见问题

￡神魔★判官ぃ 2024-03-27 14:29 30阅读 0赞

## httpclient get与post样例与常见问题 ##

### 1. get样例 ###

public void excuteWind(String params) {
        
            log.info("开始请求调用httpclent接口{}", params);
            CloseableHttpResponse response = null;
            CloseableHttpClient httpClient = HttpClients.createDefault();
            // 创建httppost
            String result = "";
            try {
        
                // 参数
                StringBuffer esbParams = new StringBuffer();
                // 字符数据最好encoding以下;这样一来，某些特殊字符才能传过去(如:某人的名字就是“&”,不encoding的话,传不过去)
                esbParams.append("devices=" + constantConfig.esbWindDevice);
                //esbParams.append("devices=" + URLEncoder.encode("&&", "utf-8"));
                //esbParams.append("devices=" + URLEncoder.encode("&&", "utf-8"));
                Date nowDate = new Date();
                Date preDate = DateUtils.addDateMinutes(nowDate, -5);
                String endTime = DateUtils.format(nowDate, "yyyy-MM-dd HH:mm:ss");
                String startTime = DateUtils.format(preDate, "yyyy-MM-dd HH:mm:ss");
                esbParams.append("&startTime="+startTime.replace(" ","+"));
                esbParams.append("&endTime="+endTime.replace(" ","+"));
                esbParams.append("&factors=PM25,PM10,CO,SO2,NO2,O3,WS,WD,TEMP,HUM,NOISE");
                String reqUrl = "http://"+constantConfig.esbWindUrl + "?" + esbParams.toString();
                log.info("url="+reqUrl);
                HttpGet httpGet = new HttpGet(reqUrl);
                RequestConfig requestConfig = RequestConfig.custom()
                        .setSocketTimeout(5000)
                        .setConnectTimeout(5000)
                        .setConnectionRequestTimeout(120000)
                        .build();
                httpGet.setConfig(requestConfig);
                httpGet.setHeader("Content-Type", "application/json;charset=utf8");
                httpGet.setHeader("appkey", constantConfig.esbWindKey);
                response = httpClient.execute(httpGet);
                int statusCode = response.getStatusLine().getStatusCode();
                if (response != null && statusCode == HttpStatus.SC_OK) {
        
                    HttpEntity entity = response.getEntity();//获取结果实体
                    result = EntityUtils.toString(entity, "UTF-8");
                    log.info("result===" + result);
                }
            } catch (Exception e) {
        
                log.info("getContent堆栈日志：" + ExceptionUtils.getStackTrace(e));
            }
    
        }

### 2. post样例 ###

public void actualHandle() throws UnsupportedEncodingException {
        
            log.info("接口调用处理器开始执行-CW");
            //1. 创建htpclient连接,2min限时
            CloseableHttpClient httpClient = null;
            URI url = null;
            CloseableHttpResponse response = null;
            try {
        
                // 配置信息
                RequestConfig requestConfig = RequestConfig.custom()
                        // 设置连接超时时间(单位毫秒)
                        .setConnectTimeout(120000)
                        // 设置请求超时时间(单位毫秒)
                        .setConnectionRequestTimeout(120000)
                        // socket读写超时时间(单位毫秒)
                        .setSocketTimeout(120000)
                        // 设置是否允许重定向(默认为true)
                        .setRedirectsEnabled(true).build();
                //url = new URI(EsbConstant.actualUrl + "?access-token=" + EsbConstant.ACCESS_TOKEN);
                SysInitConfig sysInitConfig = EsbInitConfig.getSysInitConfig();
                url = new URI(sysInitConfig.getGasUrl() + "?access-token=" + sysInitConfig.getGasToken());
                httpClient = HttpClientBuilder.create().setDefaultRequestConfig(requestConfig).build();
                HttpPost httpPost = new HttpPost(url);
                httpPost.setHeader("Content-Type", "application/json;charset=utf8");
                ActualVo actualVo = new ActualVo("实时数据表", 1, 100);
                StringEntity stringEntity = new StringEntity(JSON.toJSONString(actualVo), "utf-8");
                httpPost.setEntity(stringEntity);
                response = httpClient.execute(httpPost);
                HttpEntity entity = response.getEntity();
                String res = EntityUtils.toString(entity);
                ActualDto actualDto = JSON.parseObject(res, ActualDto.class);
                log.info("接口调用获取数据成功-CW");
                List<TpressureDevice> list = buildActualData(actualDto);
                log.info("接口调用处理器结束-CW");
            } catch (Exception e) {
        
                log.info(MessageFormat.format("实时设备数据接口异常：{0}", "请处理！"));
                log.info("错误信息：:"+ e.getMessage());
                log.info("接口调用堆栈日志："+ ExceptionUtils.getStackTrace(e));
                throw new RuntimeException("接口异常");
            } finally {
        
                //释放资源
                try {
        
                    if (httpClient != null) {
        
                        httpClient.close();
                    }
                    if (response != null) {
        
                        response.close();
                    }
                } catch (Exception e) {
        
                    log.info(MessageFormat.format("实时设备数据接口异常：{0}", "请处理!!"));
                    log.info("接口调用堆栈日志："+ ExceptionUtils.getStackTrace(e));
                }
                log.info("执行器执行结束");
            }
            //4. 保存数据，加日志
        }

### 3. 常见问题分析： ###

#### 3.1 get请求日期中的空格问题 ####

类似于url请求链中&startTime=2023-01-01 08:08:08 ，空格可用‘+’号替换

#### 3.2 get请求特殊字符问题 ####

类似于url请求链中包含特殊字符的&&用URLEncoder.encode(“&&”, “utf-8”),编码一下