Apache HTTPクライアントを使用していて、POSTリクエストをサーブレットに送信する必要があります。リクエストが送信されると、サーブレットはパラメータを受信しません(HttpServletRequest
内) 。
クライアントプログラムコードは次のとおりです。
// Engage the HTTP client
DefaultHttpClient httpclient = new DefaultHttpClient();
HttpResponse response;
try {
HttpPost httpPost = new HttpPost("http://localhost:8080/test-json-web/JSONReceiverServlet");
// Setup the request parameters
HttpParams params = new BasicHttpParams();
params.setParameter("taskdef", task1JsonString);
httpPost.setParams(params);
// Make the request
response = httpclient.execute(httpPost);
HttpEntity responseEntity = response.getEntity();
System.out.println("----------------------------------------");
System.out.println(response.getStatusLine());
if(responseEntity != null) {
System.out.println("Response content length: " + responseEntity.getContentLength());
}
String jsonResultString = EntityUtils.toString(responseEntity);
EntityUtils.consume(responseEntity);
System.out.println("----------------------------------------");
System.out.println("result:");
System.out.println();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
httpclient.getConnectionManager().shutdown();
}
POSTリクエストパラメータを正しく設定して、サーブレットが実際にそれらを受信するようにするにはどうすればよいですか?
これを試して:
List <NameValuePair> nvps = new ArrayList <NameValuePair>();
nvps.add(new BasicNameValuePair("IDToken1", "username"));
nvps.add(new BasicNameValuePair("IDToken2", "password"));
httPost.setEntity(new UrlEncodedFormEntity(nvps, Consts.UTF_8));
「Content-Type」ヘッダーを「application/x-www-form-urlencoded」に設定します
いくつかのhttpパラメーターを渡してjsonリクエストを送信する場合にも、このアプローチを使用できます。
(注:他の将来の読者に役立つ場合に備えて、いくつかのコードを追加しました)
注:インポートはorg.Apache.httpライブラリからのものです
public void postJsonWithHttpParams() throws URISyntaxException, UnsupportedEncodingException, IOException {
//add the http parameters you wish to pass
List<NameValuePair> postParameters = new ArrayList<>();
postParameters.add(new BasicNameValuePair("param1", "param1_value"));
postParameters.add(new BasicNameValuePair("param2", "param2_value"));
//Build the server URI together with the parameters you wish to pass
URIBuilder uriBuilder = new URIBuilder("http://google.ug");
uriBuilder.addParameters(postParameters);
HttpPost postRequest = new HttpPost(uriBuilder.build());
postRequest.setHeader("Content-Type", "application/json");
//this is your JSON string you are sending as a request
String yourJsonString = "{\"str1\":\"a value\",\"str2\":\"another value\"} ";
//pass the json string request in the entity
HttpEntity entity = new ByteArrayEntity(yourJsonString.getBytes("UTF-8"));
postRequest.setEntity(entity);
//create a socketfactory in order to use an http connection manager
PlainConnectionSocketFactory plainSocketFactory = PlainConnectionSocketFactory.getSocketFactory();
Registry<ConnectionSocketFactory> connSocketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory>create()
.register("http", plainSocketFactory)
.build();
PoolingHttpClientConnectionManager connManager = new PoolingHttpClientConnectionManager(connSocketFactoryRegistry);
connManager.setMaxTotal(20);
connManager.setDefaultMaxPerRoute(20);
RequestConfig defaultRequestConfig = RequestConfig.custom()
.setSocketTimeout(HttpClientPool.connTimeout)
.setConnectTimeout(HttpClientPool.connTimeout)
.setConnectionRequestTimeout(HttpClientPool.readTimeout)
.build();
// Build the http client.
CloseableHttpClient httpclient = HttpClients.custom()
.setConnectionManager(connManager)
.setDefaultRequestConfig(defaultRequestConfig)
.build();
CloseableHttpResponse response = httpclient.execute(postRequest);
//Read the response
String responseString = "";
int statusCode = response.getStatusLine().getStatusCode();
String message = response.getStatusLine().getReasonPhrase();
HttpEntity responseHttpEntity = response.getEntity();
InputStream content = responseHttpEntity.getContent();
BufferedReader buffer = new BufferedReader(new InputStreamReader(content));
String line;
while ((line = buffer.readLine()) != null) {
responseString += line;
}
//release all resources held by the responseHttpEntity
EntityUtils.consume(responseHttpEntity);
//close the stream
response.close();
// Close the connection manager.
connManager.close();
}