java - 使用带有数据和 header 的 ApacheHttpClient 进行 REST 调用

Question

除了移动应用程序，我还需要将 Kii MbaaS 服务集成到我的一个 Web 应用程序中。我正在使用 Android SDK 并且能够连接它。然而，对于使用 Java 解决方案的网站，他们没有任何 SDK，并要求我使用 REST 进行操作。现在我计划使用 Servlet 中的 ApacheHttpClient 连接到 REST 服务。他们文档中的 REST 格式如下所示。在 ApacheHttpClient 中，我知道我可以将 header (-H) 作为 HttpGet.addHeader("content-type", "application/json") 传递。但是我不确定如何传递数据 (-d)。任何人都可以通过指向任何教程链接或任何有关如何将数据连同 header 传递给 REST 服务的示例代码来帮助我吗？

REST 语法如下-

curl -v -X POST \
  -H "content-type:application/json" \
  -H "x-kii-appid:{APP_ID}" \
  -H "x-kii-appkey:{APP_KEY}" \
  "https://api.kii.com/api/oauth2/token" \
  -d '{"username":"user_123456", "password":"123ABC"}'

提前致谢。

------------------------ 编辑-------------------- ------------------------------这是我编写的示例 Java 代码，用于使用 Apache HttpClient 4.3 库进行连接，但是我一直收到 400 错误...任何人都可以提出建议吗？

错误-

Exception in thread "main" java.lang.RuntimeException: Failed : HTTP error code : 400 at com.app.test.RestClientTest.main(RestClientTest.java:49)

package com.app.test;

    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.net.MalformedURLException;
    import java.util.ArrayList;
    import java.util.List;

    import org.apache.http.Consts;
    import org.apache.http.NameValuePair;
    import org.apache.http.client.entity.UrlEncodedFormEntity;
    import org.apache.http.client.methods.CloseableHttpResponse;
    import org.apache.http.client.methods.HttpPost;
    import org.apache.http.impl.client.CloseableHttpClient;
    import org.apache.http.impl.client.HttpClients;
    import org.apache.http.message.BasicNameValuePair;

    public class RestClientTest {

        /**
         * @param args
         */
        public static void main(String[] args) {
            CloseableHttpClient httpClient = null;
            HttpPost httpost = null;
            CloseableHttpResponse response = null;

            try {

                httpClient = HttpClients.createDefault();
                httpost = new HttpPost("https://api.kii.com/api/oauth2/token");
                httpost.addHeader("content-type", "application/json");
                httpost.addHeader("x-kii-appid", "xxxxx");
                httpost.addHeader("x-kii-appkey", "xxxxxxxx");

                List<NameValuePair> nvps = new ArrayList<NameValuePair>();
                nvps.add(new BasicNameValuePair("username", "xxxxx"));
                nvps.add(new BasicNameValuePair("password", "xxxxx"));

                // StringEntity input = new
                // StringEntity("{\"qty\":100,\"name\":\"iPad 4\"}");
                // input.setContentType("application/json");
                httpost.setEntity(new UrlEncodedFormEntity(nvps, Consts.UTF_8));

                response = httpClient.execute(httpost);

                if (response.getStatusLine().getStatusCode() != 200) {
                    throw new RuntimeException("Failed : HTTP error code : "
                            + response.getStatusLine().getStatusCode());
                }

                BufferedReader br = new BufferedReader(new InputStreamReader(
                        (response.getEntity().getContent())));

                String output;
                System.out.println("Output from Server .... \n");
                while ((output = br.readLine()) != null) {
                    System.out.println(output);
                }
            } catch (MalformedURLException e) {

                e.printStackTrace();

            } catch (IOException e) {

                e.printStackTrace();

            } finally {
                try{
                    response.close();
                    httpClient.close();
                }catch(Exception ex) {
                    ex.printStackTrace();
                }
            }

        }
    }

Answer 1

好的，我解决了。我需要将数据包装成 json 格式的 stringentity 并将其发布，它会起作用。

我在这里为那些计划在移动应用程序之外的网络应用程序中使用 Kii MbaaS 的人发布同样的信息。

package com.app.test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.NameValuePair;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;

public class RestClientTest {

    /**
     * @param args
     */
    public static void main(String[] args) {
        CloseableHttpClient httpClient = null;
        HttpPost httpPost = null;
        CloseableHttpResponse response = null;

        try {

            httpClient = HttpClients.createDefault();
            httpPost = new HttpPost("https://api.kii.com/api/oauth2/token");

            List<NameValuePair> nvps = new ArrayList<NameValuePair>();
            nvps.add(new BasicNameValuePair("content-type", "application/json"));
            nvps.add(new BasicNameValuePair("x-kii-appid", "xxxxx"));
            nvps.add(new BasicNameValuePair("x-kii-appkey", "xxxxxxxxxxxxxx"));

             StringEntity input = new StringEntity("{\"username\": \"dummyuser\",\"password\": \"dummypassword\"}");
             input.setContentType("application/json");
             httpPost.setEntity(input);

            for (NameValuePair h : nvps)
            {
                httpPost.addHeader(h.getName(), h.getValue());
            }

            response = httpClient.execute(httpPost);

            if (response.getStatusLine().getStatusCode() != 200) {
                throw new RuntimeException("Failed : HTTP error code : "
                        + response.getStatusLine().getStatusCode());
            }

            BufferedReader br = new BufferedReader(new InputStreamReader(
                    (response.getEntity().getContent())));

            String output;
            System.out.println("Output from Server .... \n");
            while ((output = br.readLine()) != null) {
                System.out.println(output);
            }
        } catch (MalformedURLException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        } finally {
            try{
                response.close();
                httpClient.close();
            }catch(Exception ex) {
                ex.printStackTrace();
            }
        }

    }
}