java调用RestFul WebService的例子

pom文件

<dependency>
   <groupId>org.apache.httpcomponents</groupId>
   <artifactId>httpclient</artifactId>
   <version>4.5.3</version>
</dependency>

public void sendDataToRemote(){
        Map<String,Double> map = new HashMap<String, Double>();
        synchronized (PointValueService.mapLock){
            map = PointValueService.map;
        }
        Gson gson = new Gson();
        String url = ipAddress + "/receiveService/receiveRemoteService";     //访问远程方法路径
        String dataString = gson.toJson(map);
        System.out.println("----------------dataString----------" + dataString);
        try {
            String data = CodecTools.compressAndEncode(dataString);    // 压缩后的实时数据信息
            // TODO Java调用指定ip路径下方法 accessPath
            String t=CodecTools.decodeAndUncompress(data);
//            System.out.println("data---------------"+data);
//            System.out.println("t---------------"+t);
            List<NameValuePair> params = new ArrayList<NameValuePair>();
//            params.add(new BasicNameValuePair("userName", "Sun"));
            params.add(new BasicNameValuePair("param",data));
            getRest(url, params);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    public static String getRest(String url,List<NameValuePair> params){
        // 创建默认的httpClient实例.
        CloseableHttpClient httpclient = HttpClients.createDefault();
        // 创建httppost
        HttpPost httppost = new HttpPost(url);

        UrlEncodedFormEntity uefEntity;

        try{
            uefEntity = new UrlEncodedFormEntity(params, "UTF-8");
            httppost.setEntity(uefEntity);
            CloseableHttpResponse response = httpclient.execute(httppost);
            HttpEntity entity = response.getEntity();
            String json= EntityUtils.toString(entity, "UTF-8");
            int code= response.getStatusLine().getStatusCode();
            if(code==200 ||code ==204){
                return json;
            }
        }catch (Exception e){
            e.printStackTrace();
        }

        return "";
    }