在上一節(jié)介紹的OAuth認(rèn)證過程中我們可以看到我們需要不斷地和騰訊微博開放平臺進(jìn)行數(shù)據(jù)的交互，因此我們需要編寫一個類用來發(fā)送Http請求，并且能處理平臺返回過來的數(shù)據(jù)。學(xué)習(xí)Html的朋友應(yīng)該知道Get和Post兩種方式提交數(shù)據(jù)，在這里我們同樣也需要編寫Post和Get兩個方法模擬Post和Get請求。在發(fā)送微博時我們還可以上傳照片，所以我們還應(yīng)編寫一個方法用于上傳圖片，但是在這里暫時還不編寫上傳數(shù)據(jù)的方法。另外在模擬Http請求時我們需要傳遞參數(shù)，因此我們需創(chuàng)建一個Parameter類，表示參數(shù)對象。在騰訊微博開放平臺中關(guān)于oauth_signature參數(shù)值的產(chǎn)生過程介紹中有這樣一幅描述圖(http://open.t.qq.com/resource.php?i=1,2#tag0 )

我們可以看到參數(shù)對象是需要進(jìn)行排序的，這里的排序是 參數(shù)按name進(jìn)行字典升序排列 ，詳細(xì)介紹我們可以參考這篇介紹： http://wiki.opensns.qq.com/wiki/%E3%80%90QQ%E7%99%BB%E5%BD%95%E3%80%91%E7%AD%BE%E5%90%8D%E5%8F%82%E6%95%B0oauth_signature%E7%9A%84%E8%AF%B4%E6%98%8E 。因此我們需讓我們的Parameter類實(shí)現(xiàn)Comparable<T>接口，重寫里面的方法，最終Parameter類代碼如下：

package com.szy.weibo.model; import java.io.Serializable; /** *@author coolszy *@date 2011-5-29 *@blog http://blog.csdn.net/coolszy */ public class Parameter implements Serializable, Comparable<Parameter> { private static final long serialVersionUID = 2721340807561333705L; private String name;//參數(shù)名 private String value;//參數(shù)值 public Parameter() { super(); } public Parameter(String name, String value) { super(); this.name = name; this.value = value; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getValue() { return value; } public void setValue(String value) { this.value = value; } @Override public String toString() { return "Parameter [name=" + name + ", value=" + value + "]"; } @Override public boolean equals(Object arg0) { if (null == arg0) { return false; } if (this == arg0) { return true; } if (arg0 instanceof Parameter) { Parameter param = (Parameter) arg0; return this.getName().equals(param.getName()) && this.getValue().equals(param.getValue()); } return false; } @Override public int compareTo(Parameter param) { int compared; compared = name.compareTo(param.getName()); if (0 == compared) { compared = value.compareTo(param.getValue()); } return compared; } }

模擬發(fā)送Http請求我們可以使用HttpURLConnection類進(jìn)行操作，但是Android平臺集成了功能強(qiáng)大且編寫更容易的commons-httpclient.jar，因此在這里介紹如何通過commons-httpclient進(jìn)行Http請求。發(fā)送Http請求可以有兩種方式：一種是同步，一種是異步。由于我對異步不是很熟悉，所以這里先提供同步方式發(fā)送Http請求：

package com.szy.weibo.service; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.util.List; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.HttpStatus; import org.apache.commons.httpclient.NameValuePair; import org.apache.commons.httpclient.methods.GetMethod; import org.apache.commons.httpclient.methods.PostMethod; import org.apache.commons.httpclient.params.HttpMethodParams; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import com.szy.weibo.model.Parameter; /** *@author coolszy *@date 2011-5-29 *@blog http://blog.csdn.net/coolszy */ /** * 以同步方式發(fā)送Http請求 */ public class SyncHttp { private static final Log LOG = LogFactory.getLog(SyncHttp.class); private static final int CONNECTION_TIMEOUT = 1000 * 5; // Http連接超時時間 /** * 通過GET方式發(fā)送請求 * @param url URL地址 * @param params 參數(shù) * @return * @throws Exception */ public String httpGet(String url, String params) throws Exception { String response = null; //返回信息 if (null!=params&&!params.equals("")) { url += "?" + params; } // 構(gòu)造HttpClient的實(shí)例 HttpClient httpClient = new HttpClient(); // 創(chuàng)建GET方法的實(shí)例 GetMethod httpGet = new GetMethod(url); // 設(shè)置超時時間 httpGet.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, new Integer(CONNECTION_TIMEOUT)); try { int statusCode = httpClient.executeMethod(httpGet); if (statusCode == HttpStatus.SC_OK) //SC_OK = 200 { InputStream inputStream = httpGet.getResponseBodyAsStream(); //獲取輸出流，流中包含服務(wù)器返回信息 response = getData(inputStream);//獲取返回信息 } else { LOG.debug("Get Method Statuscode : "+statusCode); } } catch (Exception e) { throw new Exception(e); } finally { httpGet.releaseConnection(); httpClient = null; } return response; } /** * 通過POST方式發(fā)送請求 * @param url URL地址 * @param params 參數(shù) * @return * @throws Exception */ public String httpPost(String url, List<Parameter> params) throws Exception { String response = null; HttpClient httpClient = new HttpClient(); PostMethod httpPost = new PostMethod(url); //Post方式我們需要配置參數(shù) httpPost.addParameter("Connection", "Keep-Alive"); httpPost.addParameter("Charset", "UTF-8"); httpPost.addParameter("Content-Type", "application/x-www-form-urlencoded"); httpPost.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, new Integer(CONNECTION_TIMEOUT)); if (null!=params&?ms.size()!=0) { //設(shè)置需要傳遞的參數(shù)，NameValuePair[] httpPost.setRequestBody(buildNameValuePair(params)); } try { int statusCode = httpClient.executeMethod(httpPost); if (statusCode == HttpStatus.SC_OK) { InputStream inputStream = httpPost.getResponseBodyAsStream(); response = getData(inputStream); } else { LOG.debug("Post Method Statuscode : "+statusCode); } } catch (Exception e) { throw new Exception(e); } finally { httpPost.releaseConnection(); httpClient = null; } return response; } /** * 構(gòu)建NameValuePair數(shù)組 * @param params List<Parameter>集合 * @return */ private NameValuePair[] buildNameValuePair(List<Parameter> params) { int size = params.size(); NameValuePair[] pair = new NameValuePair[size]; for(int i = 0 ;i<size;i++) { Parameter param = params.get(i); pair[i] = new NameValuePair(param.getName(),param.getValue()); } return pair; } /** * 從輸入流獲取信息 * @param inputStream 輸入流 * @return * @throws Exception */ private String getData(InputStream inputStream) throws Exception { String data = ""; //內(nèi)存緩沖區(qū) ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); int len = -1; byte[] buff = new byte[1024]; try { while((len=inputStream.read(buff))!=-1) { outputStream.write(buff, 0, len); } byte[] bytes = outputStream.toByteArray(); data = new String(bytes); } catch (IOException e) { throw new Exception(e.getMessage(),e); } finally { outputStream.close(); } return data; } }

本節(jié) 課程下載地址： http://u.115.com/file/aq8oydql

本節(jié)課程文檔下載： http://download.csdn.net/source/3405206

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2.騰訊微博Android客戶端開發(fā)——Parameter類和SyncHttp類編寫