android发送网络链接的几个类

利用URLConncetion，HttpURLConnetion,HttpClient都可以发送网络的get，post请求，三者封装的程度由低到高，低级类能够实现的功能，高级类也能够实现

例如；发送网络请求下载apk的时候：

利用HttpURLConnetion，自己的代码如下

public void downLoadApkByConnection(String urlString, ProgressDialog pd) {        BufferedInputStream bis = null;        FileOutputStream fos = null;        BufferedOutputStream bos = null;        try {            URL url = new URL(urlString);            HttpURLConnection connection = (HttpURLConnection) url                    .openConnection();            connection.setConnectTimeout(5000);            pd.setMax(connection.getContentLength());                    bis = new BufferedInputStream(connection.getInputStream());            File file = new File(Environment.getExternalStorageDirectory()                    + "/update/");            if (!file.exists()) {                file.mkdirs();            }            fos=new FileOutputStream(file.getAbsoluteFile()+"绿萝空气.apk");            bos=new BufferedOutputStream(fos);            byte[] buffer = new byte[1024];            int len = 0;            int total = 0;            while ((len = bis.read(buffer)) != -1) {                total += len;                bos.write(buffer);                pd.setProgress(total);                if (connection.getContentLength() == total) {                    pd.dismiss();                }            }        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }finally{            try{            bis.close();            fos.close();            bos.close();}            catch(Exception e){                e.printStackTrace();            }        }    }

如果利用httpclient

    public void downLoadApkByHttpClient(String urlString, ProgressDialog pd) {        HttpGet get = new HttpGet(urlString);        BufferedInputStream bis = null;        FileOutputStream fos = null;        BufferedOutputStream bos = null;        //如果要设置响应超时事件，需要借助httpparams类了         BasicHttpParams httpParams = new BasicHttpParams();            HttpConnectionParams.setConnectionTimeout(httpParams, 5000);           // HttpConnectionParams.setSoTimeout(httpParams, SO_TIMEOUT);            HttpClient client = new DefaultHttpClient(httpParams);                 try {                        HttpResponse response = client.execute(get);            if (response != null                    && response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {                //如果返回的文本内容，可以直接                                //String result=EntityUtils.toString(response.getEntity());            //如果请求返回的是图片，二进制文件，需要得到相应流的话            pd.setMax((int)response.getEntity().getContentLength());                bis=new BufferedInputStream(response.getEntity().getContent());              File file = new File(Environment.getExternalStorageDirectory()                        + "/update2/");                if (!file.exists()) {                    file.mkdirs();                }                fos=new FileOutputStream(file.getAbsoluteFile()+"绿萝空气.apk");                bos=new BufferedOutputStream(fos);                byte[] buffer = new byte[1024];                int len = 0;                int total = 0;                while ((len = bis.read(buffer)) != -1) {                    total += len;                    bos.write(buffer);                    pd.setProgress(total);                    if(total==response.getEntity().getContentLength()){                        pd.dismiss();                    }                                                         }            }        } catch (Exception e) {            e.printStackTrace();        }    }

关键是有些方法可能不清楚，如，如何得到相应的字符串，如何得到响应流？

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