Android项目使用httpclient - > http.client(apache),post/get方法

Question

我正在为一个Android项目做一个Get和Post方法,我需要将HttpClient 3.x"翻译"到HttpClient 4.x(由android使用).我的问题是,我不确定我做了什么,我找不到某些方法的"翻译"......

这是我做过的HttpClient 3.x和( - >)HttpClient 4.x"翻译"如果我找到它(只有那些问我问题的人):

HttpState state = new HttpState (); --> ?

HttpMethod method = null; --> HttpUriRequest httpUri = null;

method.abort(); --> httpUri.abort(); //httpUri is a HttpUriRequest

method.releaseConnection(); --> conn.disconnect(); //conn is a HttpURLConnection

state.clearCookies(); --> cookieStore.clear(); //cookieStore is a BasicCookieStore

HttpClient client = new HttpClient(); --> DefaultHttpClient client = new DefaultHttpClient();

client.getHttpConnectionManager().getParams().setConnectionTimeout(SOCKET_TIMEOUT) --> HttpConnectionParams.setConnectionTimeout(param, SOCKET_TIMEOUT);

client.setState(state); --> ?

client.getParams().setCookiePolicy(CookiePolicy.RFC_2109); --> HttpClientParams.setCookiePolicy(param, CookiePolicy.RFC_2109);

PostMethod post = (PostMethod) method; --> ?

post.setRequestHeader(...,...); --> conn.setRequestProperty(...,...);

post.setFollowRedirects(false); --> conn.setFollowRedirects(false);

RequestEntity tmp = null; --> ?

tmp = new StringRequestEntity(...,...,...); --> ?

int statusCode = client.executeMethod(post); --> ?

String ret = method.getResponsBodyAsString(); --> ?

Header locationHeader = method.getResponseHeader(...); --> ?

ret = getPage(...,...); --> ?

我不知道这是否正确.这导致了问题,因为包的命名方式不同,也有一些方法.我只需要文档(我还没有找到)并且没什么帮助.

Answer 1

以下是HttpClient 4文档,这是Android正在使用的(4,而不是3,从1.0-> 2.x).文档很难找到(感谢Apache;))因为HttpClient现在是HttpComponents的一部分(如果你只是寻找HttpClient,你通常会得到3.x的东西).

此外,如果您执行任意数量的请求,则不希望一遍又一遍地创建客户端.而是,作为HttpClient的教程注释,创建一次客户端并保持它.从那里使用ThreadSafeConnectionManager.

我使用了一个辅助类,例如HttpHelper(它仍然是一个移动的目标 - 我计划在某个时候将它移动到它自己的Android util项目,并支持二进制数据,还没有到达那里),以帮助这个.助手类创建客户端,并具有get/post/etc的便利包装方法.无论您何时从Activity中使用此类,都应创建内部内部AsyncTask(以便在发出请求时不阻止UI线程),例如:

    private class GetBookDataTask extends AsyncTask<String, Void, Void> {
      private ProgressDialog dialog = new ProgressDialog(BookScanResult.this);

      private String response;
      private HttpHelper httpHelper = new HttpHelper();

      // can use UI thread here
      protected void onPreExecute() {
         dialog.setMessage("Retrieving HTTP data..");
         dialog.show();
      }

      // automatically done on worker thread (separate from UI thread)
      protected Void doInBackground(String... urls) {
         response = httpHelper.performGet(urls[0]);
         // use the response here if need be, parse XML or JSON, etc
         return null;
      }

      // can use UI thread here
      protected void onPostExecute(Void unused) {
         dialog.dismiss();
         if (response != null) {
            // use the response back on the UI thread here
            outputTextView.setText(response);
         }
      }
   }

Answer 2

回答我问题的最简单方法是向您展示我所做的课程:

public class HTTPHelp{

    DefaultHttpClient httpClient = new DefaultHttpClient();
    HttpContext localContext = new BasicHttpContext();
    private boolean abort;
    private String ret;

    HttpResponse response = null;
    HttpPost httpPost = null;

    public HTTPHelp(){

    }

    public void clearCookies() {

        httpClient.getCookieStore().clear();

    }

    public void abort() {

        try {
            if(httpClient!=null){
                System.out.println("Abort.");
                httpPost.abort();
                abort = true;
            }
        } catch (Exception e) {
            System.out.println("HTTPHelp : Abort Exception : "+e);
        }
    }

    public String postPage(String url, String data, boolean returnAddr) {

        ret = null;

        httpClient.getParams().setParameter(ClientPNames.COOKIE_POLICY, CookiePolicy.RFC_2109);

        httpPost = new HttpPost(url);
        response = null;

        StringEntity tmp = null;        

        httpPost.setHeader("User-Agent", "Mozilla/5.0 (X11; U; Linux " +
            "i686; en-US; rv:1.8.1.6) Gecko/20061201 Firefox/2.0.0.6 (Ubuntu-feisty)");
        httpPost.setHeader("Accept", "text/html,application/xml," +
            "application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5");
        httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded");

        try {
            tmp = new StringEntity(data,"UTF-8");
        } catch (UnsupportedEncodingException e) {
            System.out.println("HTTPHelp : UnsupportedEncodingException : "+e);
        }

        httpPost.setEntity(tmp);

        try {
            response = httpClient.execute(httpPost,localContext);
        } catch (ClientProtocolException e) {
            System.out.println("HTTPHelp : ClientProtocolException : "+e);
        } catch (IOException e) {
            System.out.println("HTTPHelp : IOException : "+e);
        } 
                ret = response.getStatusLine().toString();

                return ret;
                }
}

我使用本教程来做我的post方法和示例