java post 登陆_java HttpPost 密码登录和提交表单的案例

记录java HttpPost 密码登录鉴权和提交表单的案例，使用的是httppost而不是HttpURLConnection

httpost需要下面的依赖

org.apache.httpcomponents

httpclient

String content = null;

CloseableHttpClient httpClient =null;

CloseableHttpResponse httpresponse = null;

try {

httpClient = HttpClients.createDefault();

//用户名密码登录鉴权

HttpClientContext context = HttpClientContext.create();

CredentialsProvider credsProvider = new BasicCredentialsProvider();

Credentials credentials = new org.apache.http.auth.UsernamePasswordCredentials(clientId, clientSecret);

credsProvider.setCredentials(AuthScope.ANY, credentials);

context.setCredentialsProvider(credsProvider);

HttpPost httpPost=new HttpPost(url);

//提交表单信息

List params=new ArrayList();

params.add(new BasicNameValuePair("grant_type","client_credentials"));

httpPost.setEntity(new UrlEncodedFormEntity(params));

httpresponse = httpClient.execute(httpPost,context);

content = EntityUtils.toString(httpresponse.getEntity());

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

} catch (ClientProtocolException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

if(httpresponse!=null)httpresponse.close();

if(httpClient!=null)httpClient.close();

} catch (IOException e) {

e.printStackTrace();

}

}

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