http的应用httpurlconnection--------1

http请求后获得所需要的是字符串的时候

                URL url=new URL(strurl);
                try {
                    HttpURLConnection conn=(HttpURLConnection) url.openConnection();
                    conn.setConnectTimeout(10*1000);
                    conn.setRequestMethod("GET");
                    conn.setDoInput(true);
                    conn.connect();
                    int size=conn.getContentLength();
                    InputStream input=conn.getInputStream();
                    InputStreamReader inputreader=new InputStreamReader(input);
                    BufferedReader bufferreader=new BufferedReader(inputreader);
                    StringBuffer strbuffer=new StringBuffer();
                    byte [] b=new byte [1024];
                    String  temp;
                    while((temp=bufferreader.readLine())!=null){
                        strbuffer.append(b);
                    }
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            

文件下载

 /**

     * 文件下载

     */

    private void downloadFile()

    {

        try {

            URL u = new URL(url);

            URLConnection conn = u.openConnection();

            conn.connect();

            InputStream is = conn.getInputStream();

            fileSize = conn.getContentLength();

            if(fileSize<1||is==null)

            {

                sendMessage(DOWNLOAD_ERROR);

            }else{

                sendMessage(DOWNLOAD_PREPARE);

                FileOutputStream fos = new FileOutputStream(getPath());

                byte[] bytes = new byte[1024];

                int len = -1;

                while((len = is.read(bytes))!=-1)

                {

                    fos.write(bytes, 0, len);

                    downloadSize+=len;

                    sendMessage(DOWNLOAD_WORK);

                }

                sendMessage(DOWNLOAD_OK);

                is.close();

                fos.close();

            }

        } catch (Exception e) {

            sendMessage(DOWNLOAD_ERROR);

            e.printStackTrace();

        }

    }

    /**

     * 得到文件的保存路径

     * @return

     * @throws IOException

     */

    private String getPath() throws IOException

    {

        String path = FileUtil.setMkdir(this)+File.separator+url.substring(url.lastIndexOf("/")+1);

        return path;

    }

BitMap对象

URL  url = new URL(params);

HttpURLConnection conn  = (HttpURLConnection)url.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream inputStream=conn.getInputStream();
bitmap = BitmapFactory.decodeStream(inputStream