使用Java for Android的HTTP API请求

Question

我找到了我想免费玩的API。我想问一下是否要使用API​​开发Android应用，并且该API基于HTTP协议（RESTful），如何使用
HTTPClient 对象来实现？

我有一般要求的信息。

HEAD /authenticate/ HTTP/1.1
Host: my.api.com
Date: Thu, 17 Jul 2008 14:52:54 GMT
X-SE-Client: some-value
X-SE-Accept: xml
X-SE-Auth: 90a6d325e982f764f86a7e248edf6a660d4ee833

以上的回应将是成功的话。

HTTP/1.1 200 OK
Date: Thu, 17 Jul 2008 14:52:55 GMT
Server: MyApi
Content-Length: 795
Connection: close
Content-Type: text/xml

我知道如何使用HTTPClient发送HTTP请求，但是否向请求中添加了额外的标头和其他不必要的内容？如何查看HTTPClient对象发出的请求？我只想简单地请求像
telnet 一样传递文本。

Answer 1

您应该能够在Android中使用HttpClient来完成所需的工作。我刚刚完成了将Android与ASP.NET MVC 3站点集成的第一部分，我必须说-
这非常轻松。我使用Json作为数据交换格式。

您可以在建立请求后通过设置调试点来准确查看标头的外观。这是一些示例代码（请记住，这只是示例代码-并非完整的实现）。

此类由不同于UI线程的单独线程调用：

public class RemoteDBAdapter {


    public String register(String email, String password) throws Exception
    {
        RestClient c = new RestClient("http://myurl/Account/Register");
        c.AddHeader("Accept", "application/html" target="_blank">json");
        c.AddHeader("Content-type", "application/json");
        c.AddParam("Email", email);
        c.AddParam("Password", password);

        c.Execute(RequestMethod.POST);

        JSONObject key = new JSONObject(c.getResponse());

        return key.getString("status");


    }

}

使用此类来构建您的请求并执行它：

public class RestClient {

    public enum RequestMethod {
        GET,
        POST
    }

    private ArrayList <NameValuePair> params;
    private ArrayList <NameValuePair> headers;

    private String url;

    private int responseCode;
    private String message;

    private String response;

    public String getResponse() {
        return response;
    }

    public String getErrorMessage() {
        return message;
    }

    public int getResponseCode() {
        return responseCode;
    }

    public RestClient(String url)
    {
        this.url = url;
        params = new ArrayList<NameValuePair>();
        headers = new ArrayList<NameValuePair>();
    }

    public void AddParam(String name, String value)
    {
        params.add(new BasicNameValuePair(name, value));
    }

    public void AddHeader(String name, String value)
    {
        headers.add(new BasicNameValuePair(name, value));
    }

    public void Execute(RequestMethod method) throws Exception
    {
        switch(method) {
            case GET:
            {
                //add parameters
                String combinedParams = "";
                if(!params.isEmpty()){
                    combinedParams += "?";
                    for(NameValuePair p : params)
                    {
                        String paramString = p.getName() + "=" + URLEncoder.encode(p.getValue(),"UTF-8");
                        if(combinedParams.length() > 1)
                        {
                            combinedParams  +=  "&" + paramString;
                        }
                        else
                        {
                            combinedParams += paramString;
                        }
                    }
                }

                HttpGet request = new HttpGet(url + combinedParams);

                //add headers
                for(NameValuePair h : headers)
                {
                    request.addHeader(h.getName(), h.getValue());
                }

                executeRequest(request, url);
                break;
            }
            case POST:
            {
                HttpPost request = new HttpPost(url);

                //add headers
                for(NameValuePair h : headers)
                {
                    request.addHeader(h.getName(), h.getValue());
                }
                JSONObject jo = new JSONObject();


                if(!params.isEmpty()){
                    for (int i = 0; i < params.size();i++)
                    {
                        jo.put(params.get(i).getName(),params.get(i).getValue());


                    }
                    StringEntity se = new StringEntity(jo.toString());
                    se.setContentType("text/xml"); 
                    se.setContentEncoding( new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));

                    request.setEntity(se);
                    //request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
                }

                executeRequest(request, url);
                break;
            }
        }
    }

    private void executeRequest(HttpUriRequest request, String url)
    {
        //HttpClient client = new DefaultHttpClient();
        HttpClient client = HttpClientFactory.getThreadSafeClient();

        HttpResponse httpResponse;

        try {
            httpResponse = client.execute(request);
            responseCode = httpResponse.getStatusLine().getStatusCode();
            message = httpResponse.getStatusLine().getReasonPhrase();

            HttpEntity entity = httpResponse.getEntity();

            if (entity != null) {

                InputStream instream = entity.getContent();
                response = convertStreamToString(instream);

                // Closing the input stream will trigger connection release
                instream.close();
            }

        } catch (ClientProtocolException e)  {
            client.getConnectionManager().shutdown();
            e.printStackTrace();
        } catch (IOException e) {
            client.getConnectionManager().shutdown();
            e.printStackTrace();
        }
    }

    private static String convertStreamToString(InputStream is) {

        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();

        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }
}

编辑：

哦，还有HttpClientFactory：

// Should be thread safe
public class HttpClientFactory {

            private static DefaultHttpClient client;

            public synchronized static DefaultHttpClient getThreadSafeClient() {
                    if (client != null)
                            return client;
                    client = new DefaultHttpClient();
                    ClientConnectionManager mgr = client.getConnectionManager();
                    HttpParams params = client.getParams();
                    client = new DefaultHttpClient(new ThreadSafeClientConnManager(params,
                                    mgr.getSchemeRegistry()), params);
                return client;

            }
    }