HttpClient总结

HtttpClient使用例子

说明

因为不懂，所以记录

使用的是org.apache.httpcomponents而非org.apache.commons。至于原因，apache说“httpcomponents是升级版，很牛，强烈建议亲们用httpcomponents，还有，commons已死”

httpcomponents的版本，不知道具体哪个版本以后是都OK的，但是以下版本之后肯定是可以的;

httpclient: 4.5

httpcore：4.4.3

POST请求：

HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
CloseableHttpClient httpClient = httpClientBuilder.build();

HttpPost post = new HttpPost(url);
try {
List <NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair(“para1”, "“para1”"));
params.add(new BasicNameValuePair("para2", “para2”));
HttpEntity entity = new UrlEncodedFormEntity(params, Charset.forName("UTF-8"));
post.setEntity(entity);

CloseableHttpResponse response = httpClient.execute(post);
ObjectMapper mapper = new ObjectMapper();
JsonNode root = mapper.readTree(response.getEntity().getContent());
if (null != root) {
String respPara1 = root.get("respPara1").asText();
String respPara2 = ak.get("respPara2").asText();
}
} finally {
post.releaseConnection();
httpClient.close();
}

GET请求：

HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
CloseableHttpClient httpClient = httpClientBuilder.build();

HttpGet get = new HttpGet(url);

try {=
CloseableHttpResponse response = httpClient.execute(get);

ObjectMapper mapper = new ObjectMapper();
JsonNode root = mapper.readTree(response.getEntity().getContent());
if (null != root) {
String respPara1 = root.get("respPara1").asText();
String respPara2 = ak.get("respPara2").asText();
}
} finally {
get.releaseConnection();
httpClient.close();
}