[Android開發]Android之使用HTTP的get,post,HttpClient三種方式向服務器端提交文本數據

客戶端代碼示例:

/**
 * HTTP請求
 * @author kesenhoo
 *
 */
public class HttpRequest
{
    public static boolean sendXML(String path, String xml)throws Exception
    {
        byte[] data = xml.getBytes();
        URL url = new URL(path);
        HttpURLConnection conn = (HttpURLConnection)url.openConnection();
        conn.setRequestMethod("POST");
        conn.setConnectTimeout(5 * 1000);
        //如果通過post提交數據，必須設置允許對外輸出數據
        conn.setDoOutput(true);
        conn.setRequestProperty("Content-Type", "text/xml; charset=UTF-8");
        conn.setRequestProperty("Content-Length", String.valueOf(data.length));
        OutputStream outStream = conn.getOutputStream();
        outStream.write(data);
        outStream.flush();
        outStream.close();
        if(conn.getResponseCode()==200)
        {
            return true;
        }
        return false;
    }
    /**
     * 通過get方式提交參數給服務器
     * @param path
     * @param params
     * @param enc
     * @return
     * @throws Exception
     */
    public static boolean sendGetRequest(String path, Map<String, String> params, String enc) throws Exception
    {
        //構造如下形式的字符串，這裏的字符串依情況不同
        // ?method=save&title=435435435&timelength=89&
        //使用StringBuilder對象
        StringBuilder sb = new StringBuilder(path);
        sb.append('?');
        //迭代Map
        for(Map.Entry<String, String> entry : params.entrySet())
        {
            sb.append(entry.getKey()).append('=')
                .append(URLEncoder.encode(entry.getValue(), enc)).append('&');
        }
        sb.deleteCharAt(sb.length()-1);
        //打開鏈接
        URL url = new URL(sb.toString());
        HttpURLConnection conn = (HttpURLConnection)url.openConnection();
        conn.setRequestMethod("GET");
        conn.setConnectTimeout(5 * 1000);
        //如果請求響應碼是200，則表示成功
        if(conn.getResponseCode()==200)
        {
            return true;
        }
        return false;
    }

    /**
     * 通過Post方式提交參數給服務器
     * @param path
     * @param params
     * @param enc
     * @return
     * @throws Exception
     */
    public static boolean sendPostRequest(String path, Map<String, String> params, String enc) throws Exception
    {
        //需要構造的字符串形式如下：
        // title=dsfdsf&timelength=23&method=save
        StringBuilder sb = new StringBuilder();
        //如果參數不爲空
        if(params!=null && !params.isEmpty())
        {
            for(Map.Entry<String, String> entry : params.entrySet())
            {
                //Post方式提交參數的話，不能省略內容類型與長度
                sb.append(entry.getKey()).append('=')
                    .append(URLEncoder.encode(entry.getValue(), enc)).append('&');
            }
            sb.deleteCharAt(sb.length()-1);
        }
        //得到實體的二進制數據
        byte[] entitydata = sb.toString().getBytes();
        URL url = new URL(path);
        HttpURLConnection conn = (HttpURLConnection)url.openConnection();
        conn.setRequestMethod("POST");
        conn.setConnectTimeout(5 * 1000);
        //如果通過post提交數據，必須設置允許對外輸出數據
        conn.setDoOutput(true);
        //這裏只設置內容類型與內容長度的頭字段
        //內容類型Content-Type: application/x-www-form-urlencoded
        //內容長度Content-Length: 38
        conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        conn.setRequestProperty("Content-Length", String.valueOf(entitydata.length));
        OutputStream outStream = conn.getOutputStream();
        //把實體數據寫入是輸出流
        outStream.write(entitydata);
        //內存中的數據刷入
        outStream.flush();
        outStream.close();
        //如果請求響應碼是200，則表示成功
        if(conn.getResponseCode()==200)
        {
            return true;
        }
        return false;
    }

    /**
     * 在遇上HTTPS安全模式或者操作cookie的時候使用HTTPclient會方便很多
     * 使用HTTPClient（開源項目）向服務器提交參數
     * @param path
     * @param params
     * @param enc
     * @return
     * @throws Exception
     */
    public static boolean sendRequestFromHttpClient(String path, Map<String, String> params, String enc) throws Exception
    {
        //需要把參數放到NameValuePair
        List<NameValuePair> paramPairs = new ArrayList<NameValuePair>();
        if(params!=null && !params.isEmpty())
        {
            for(Map.Entry<String, String> entry : params.entrySet())
            {
                paramPairs.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
            }
        }
        //對請求參數進行編碼，得到實體數據
        UrlEncodedFormEntity entitydata = new UrlEncodedFormEntity(paramPairs, enc);
        //構造一個請求路徑
        HttpPost post = new HttpPost(path);
        //設置請求實體
        post.setEntity(entitydata);
        //瀏覽器對象
        DefaultHttpClient client = new DefaultHttpClient();
        //執行post請求
        HttpResponse response = client.execute(post);
        //從狀態行中獲取狀態碼，判斷響應碼是否符合要求
        if(response.getStatusLine().getStatusCode()==200)
        {
            return true;
        }
        return false;
    }
}