停下脚步才注意到 世界被染得雪白

-----------------------------------------------------------------------------------------------------------------

在日常开发的时候，经常会遇到需要调用别人的接口的场景。但是每次需要的时候，都需要百度，很麻烦，所以这里总结一下，经常调用的方法。

1.含有文件的post请求

public static String requestOCRForHttp(String url, Map<String, String> requestParams, String filePathAndName)
			throws Exception {
		String result = null;
		CloseableHttpClient httpClient = HttpClients.createDefault();
		/** HttpPost */
		HttpPost httpPost = new HttpPost(url);
		MultipartEntity reqEntity = new MultipartEntity(); // 建立多文件实例
		FileBody filebody = new FileBody(new File(filePathAndName));
		reqEntity.addPart("pic", filebody);// upload为请求后台的File upload;
		for (String key : requestParams.keySet()) {
			String value = requestParams.get(key);
			reqEntity.addPart(key, new StringBody(value, Charset.forName("utf-8")));
		}
		httpPost.setEntity(reqEntity); // 设置实体
		/** HttpResponse */
		CloseableHttpResponse httpResponse = httpClient.execute(httpPost);
		try {
			HttpEntity httpEntity = httpResponse.getEntity();
			result = EntityUtils.toString(httpEntity, "utf-8");
			EntityUtils.consume(httpEntity);
		} finally {
			try {
				if (httpResponse != null) {
					httpResponse.close();
				}
			} catch (IOException e) {
				logger.info("## release resouce error ##" + e);
			}
		}
		return result;
	}

2.单纯的Json

public static String sendHttpPost(String url, String JSONBody) throws Exception {
		CloseableHttpClient httpClient = HttpClients.createDefault();
		HttpPost httpPost = new HttpPost(url);
		httpPost.addHeader("Content-Type", "application/json");
		httpPost.setEntity(new StringEntity(JSONBody));
		CloseableHttpResponse response = httpClient.execute(httpPost);
//		System.out.println(response.getStatusLine().getStatusCode() + "
");
		HttpEntity entity = response.getEntity();
		String responseContent = EntityUtils.toString(entity, "UTF-8"); 
//		System.out.println(responseContent);
		response.close();
		httpClient.close();
		return responseContent;
	}

3.String参数

public static String requestOCRForHttp(String url, Map<String, String> requestParams) throws Exception {
		String result = null;
		CloseableHttpClient httpClient = HttpClients.createDefault();
		/** HttpPost */
		HttpPost httpPost = new HttpPost(url);
		List<NameValuePair> params = new ArrayList<NameValuePair>();
		Iterator<Entry<String, String>> it = requestParams.entrySet().iterator();
//		System.out.println(params.toString());
		while (it.hasNext()) {
			Entry<String, String> en = it.next();
			String key = en.getKey();
			String value = en.getValue();
			if (value != null) {
				params.add(new BasicNameValuePair(key, value));
			}
		}
		httpPost.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
		/** HttpResponse */
		CloseableHttpResponse httpResponse = httpClient.execute(httpPost);
		try {
			HttpEntity httpEntity = httpResponse.getEntity();
			result = EntityUtils.toString(httpEntity, "utf-8");
			EntityUtils.consume(httpEntity);
		} finally {
			try {
				if (httpResponse != null) {
					httpResponse.close();
				}
			} catch (IOException e) {
				logger.info("## release resouce error ##" + e);
			}
		}
		return result;
	}