java调用http请求json

最近遇到的问题，java如何调用http请求json：

public class HttpClientUtil {
private static final String CONTENT_TYPE_TEXT_JSON = "text/json";
private static final String APPLICATION_JSON = "application/json";

public static String postJson(String url, String json) {
CloseableHttpClient httpclient = HttpClients.createDefault();
HttpPost httppost = new HttpPost(url);
httppost.addHeader(HTTP.CONTENT_TYPE, APPLICATION_JSON);
try {
StringEntity se = new StringEntity(json);
se.setContentType(CONTENT_TYPE_TEXT_JSON);
se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, APPLICATION_JSON));
httppost.setEntity(se);
CloseableHttpResponse response = httpclient.execute(httppost);
try {
HttpEntity entity = response.getEntity();
if (entity != null) {
return EntityUtils.toString(entity, "UTF-8");
}
} finally {
response.close();
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
// 关闭连接,释放资源
try {
httpclient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return "";
}
}

转载于:https://www.cnblogs.com/crazyapple/p/5489537.html