如何使用HttpPost参数

Question

我正在使用这个方法的RESTfull webservice:

@POST
@Consumes({"application/json"})
@Path("create/")
public void create(String str1, String str2){
System.out.println("value 1 = " + str1);
System.out.println("value 2 = " + str2);
}

在我的Android应用中,我想调用此方法.如何使用org.apache.http.client.methods.HttpPost为参数赋予正确的值;

我注意到我可以使用注释@HeaderParam并简单地将标头添加到HttpPost对象.这是正确的方法吗？这样做:

httpPost.setHeader("Accept", "application/json");
httpPost.setHeader("str1", "a value");
httpPost.setHeader("str2", "another value");

在httpPost上使用setEntity方法将不起作用.它仅使用json字符串设置参数str1.使用时如:

JSONObject json = new JSONObject();
json.put("str1", "a value");
json.put("str2", "another value");
HttpEntity e = new StringEntity(json.toString());
httpPost.setEntity(e);
//server output: value 1 = {"str1":"a value","str2":"another value"} 

Answer 1

要设置HttpPostRequest您可以使用的参数BasicNameValuePair,如下所示:

    HttpClient httpclient;
    HttpPost httppost;
    ArrayList<NameValuePair> postParameters;
    httpclient = new DefaultHttpClient();
    httppost = new HttpPost("your login link");


    postParameters = new ArrayList<NameValuePair>();
    postParameters.add(new BasicNameValuePair("param1", "param1_value"));
    postParameters.add(new BasicNameValuePair("param2", "param2_value"));

    httpPost.setEntity(new UrlEncodedFormEntity(postParameters, "UTF-8"));

    HttpResponse response = httpclient.execute(httpPost);

Answer 2

如果您想传递一些http参数并发送json请求，也可以使用这种方法：

（注意：我添加了一些额外的代码，以防将来对其他读者有所帮助）

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();
}