Httpclient 发送 get 请求

骑猪看日落 2022-12-13 14:03 257阅读 0赞

Httpclient 发送get请求：

1、工具客户端代码：

public  NmpResponse doGet(NmpRequest request) throws IOException {
            logger.info("------------开始GET请求 nmpHttpClient------------");
            String charset="UTF-8";
            HttpClient httpClient = new HttpClient();
            //设置Http连接超时为15秒
            httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(15000);
            Map<String,String> params = request.getParams();
            String paramValue ="";
            if (null != params && params.size()>0) {
                paramValue=paramValue+"?";
                for(Map.Entry<String,String> param : params.entrySet()) {
                    String key = param.getKey();
                    String paramEncode  = null;
                    if ("?".equals(paramValue)) {
                        paramEncode =  URLEncoder.encode(params.get(key),"UTF-8");//参数转义
                        paramValue = paramValue+key+"="+ paramEncode;
                    } else {
                        paramEncode =  URLEncoder.encode(params.get(key),"UTF-8");
                        paramValue = paramValue+"&"+key+"="+ paramEncode;
                    }
                }
            }
             String URL =NMP_ROOT_URL+request.getUrl()+paramValue;
            System.out.println("访问接口的全路径转义后："+URL);
            GetMethod getMethod = new GetMethod(URL);
            getMethod = setHeaderAuthInfo(getMethod);
            NmpResponse response = new NmpResponse();
            try {
                logger.info("------------开始执行GET请求，url:{}------------",URL);
                int statusCode = httpClient.executeMethod(getMethod);
                logger.info("------------GET请求结束，code={}------------",statusCode);
    
                if (statusCode != HttpStatus.SC_OK){
                    logger.error("请求出错code={}：{}" ,statusCode ,getMethod.getStatusLine());
                }
                Header[] headers = getMethod.getResponseHeaders();
                byte[] responseBody = getMethod.getResponseBody();
                String s = new String(responseBody, charset);
    
                response.setRespBody(responseBody);
                response.setRespHeaders(headers);
                response.setResponseStr(s);
                logger.info("------------结束GET请求 nmpHttpClient------------");
            } catch (IOException e){
                logger.error("请求出错IOException：{}" ,e);
                throw e;
            }  finally {      
                getMethod.releaseConnection();//.释放连接
            }
            return response;
        }

2、服务端接收参数的方法可以这样设置：

@GetMapping(value = {"/query/getData"})
        public Object  getQueryPartition( @RequestParam("parameter") String parameter) {
    
            String catName = "" ;
            String layName = "" ;
            String parName = "" ;
            Integer  version = -1 ;
            String productVersion = Constant.ProductVersionLastest ;
    
    
             if (! "".equals(parameter)){
                  JSONObject jsonObject = JSONObject.parseObject(parameter);
    
                  layerName = jsonObject.getString("layName");
                  partitionName = jsonObject.getString("parName");
    
                 if (StringUtils.isEmpty(layName)){
                     return new JSONObject();
                 }
                 if (StringUtils.isEmpty(parName)){
                     return new JSONObject();
                 }
                 if(jsonObject.containsKey("catName")){
                     catalogName = jsonObject.getString("catName");
                 }
                  if(jsonObject.containsKey("version")){
                      version = Integer.valueOf(jsonObject.getString("version"));
                  }
                 if(jsonObject.containsKey("productVersion")){
                     productVersion = jsonObject.getString("productVersion");
                 }
             }
    
            //这里处理业务的代码省略
    
            return null;
    
        }

3、双端代码已贴，大家可以试一下，有不明白的地方可以留言。