Android进阶篇-上传/下载图片

/**
     * 上传图片到服务器
     * @param uploadFile 要上传的文件目录
     * @param actionUrl 上传的地址
     * @return String
     */
    public static HashMap<String, Object> uploadFile(String actionUrl,Drawable drawable){
      Log.info(TAG, "urlPath= " + actionUrl);

      String end ="\r\n";
      String twoHyphens ="--";
      String boundary ="*****";

      HttpURLConnection con = null;
      DataOutputStream ds = null;
      InputStream is = null;
      StringBuffer sb = null;
      HashMap<String, Object> map = null;

      try{
        URL url =new URL(actionUrl);
        con=(HttpURLConnection)url.openConnection();
        /* 允许Input、Output，不使用Cache */
        con.setDoInput(true);
        con.setDoOutput(true);
        con.setUseCaches(false);

        /* 设置传送的method=POST */
        con.setRequestMethod("POST");
        /* setRequestProperty */
        con.setRequestProperty("Connection", "Keep-Alive");
        con.setRequestProperty("Charset", "UTF-8");
        con.setRequestProperty("Content-Type","multipart/form-data;boundary="+boundary);
        /* 设置DataOutputStream */
        ds = new DataOutputStream(con.getOutputStream());
        ds.writeBytes(twoHyphens + boundary + end);
        ds.writeBytes("Content-Disposition: form-data; "+ "name=\"file1\";filename=\""+ MyAppActivity.FILENAME +"\""+ end);
        ds.writeBytes(end);  

        if(drawable != null){
            Bitmap bitmap = drawableToBitmap(drawable);
            byte[] buffer = Bitmap2Bytes(bitmap);
            ds.write(buffer);
        }

        ds.writeBytes(end);
        ds.writeBytes(twoHyphens + boundary + twoHyphens + end);
        /* close streams */
        ds.flush();
        /* 取得Response内容 */

        Log.info(TAG, "code= " + con.getResponseCode());
        if(con.getResponseCode() == 200){
            is = con.getInputStream();

            int ch;
            sb =new StringBuffer();
            while( ( ch = is.read() ) !=-1 ){
              sb.append( (char)ch );
            }
            ds.close();

            Log.info(TAG, "sb= " + sb.toString());
            if(!sb.toString().equals("") || sb.toString() != null){
                 map = new HashMap<String, Object>();
                 map = JsonUtil.parseJSON(sb.toString());
            }
        }

      }catch (MalformedURLException e) {
            Log.info("json","url error");
            e.printStackTrace();
        } catch(FileNotFoundException e){
            Log.info("json","file not found");
        }catch (IOException e) {
            Log.info("json","io error");
            e.printStackTrace();
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            try{
                if(ds != null){
                    ds.close();
                }
                if(is != null){
                    is.close();
                }
            }catch(IOException e){
                e.printStackTrace();
            }
        }
        return map;
    }

    /**
     * drawable转换为bitamp
     */
    private static Bitmap drawableToBitmap(Drawable drawable) {
        // 取 drawable 的长宽
        int w = drawable.getIntrinsicWidth();
        int h = drawable.getIntrinsicHeight();

        // 取 drawable 的颜色格式
        Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888: Bitmap.Config.RGB_565;
        // 建立对应 bitmap
        Bitmap bitmap = Bitmap.createBitmap(w, h, config);
        // 建立对应 bitmap 的画布
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, w, h);
        // 把 drawable 内容画到画布中
        drawable.draw(canvas);
        return bitmap;
    }

    private static byte[] Bitmap2Bytes(Bitmap bm) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
        return baos.toByteArray();
    }

    public static void downLoadImage(String urlPath){
        String fileName = urlPath.substring(urlPath.lastIndexOf('/')+1,urlPath.length());//提取下载图片的文件名
        Bitmap bitmap=GetNetBitmap(urlPath);//得到bitmap
        File file = new File(MyAppActivity.DIRPATH);
        if(!file.exists()){
            file.mkdir();
        }    

        File file2 = new File(MyAppActivity.DIRPATH,fileName);
        if(!file2.exists()){
            //将网络上读取的图片保存到SDCard中
            try {
                FileOutputStream out=new FileOutputStream(new File(MyAppActivity.DIRPATH, fileName));//为图片文件实例化输出流
                if(bitmap.compress(Bitmap.CompressFormat.PNG, 100, out)){//对图片保存
                    out.flush();
                    Log.info("json","Success");
                    out.close();
                }
            }catch (FileNotFoundException e) {
                // TODO: handle exception
                Log.info("json","文件没发现！！");
                e.printStackTrace();
            }catch (IOException e){
                e.printStackTrace();
                Log.info("json","数据流错误！！");
            }
        }
    }

    /**
     * 取得网络上的图片
     * @param url 图片的URL
     */
    @SuppressWarnings("unused")
    private static Bitmap GetNetBitmap(String url){
        URL imageUrl = null;
        Bitmap bitmap=null;
        try {
            imageUrl = new URL(url);
        }
        catch (MalformedURLException e) {
            e.printStackTrace();
        }

        if (imageUrl != null) {
            try {
                HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection();
                conn.setDoInput(true);// 设置请求的方式
                conn.connect();

                InputStream is = conn.getInputStream();// 将得到的数据转化为inputStream
                bitmap = BitmapFactory.decodeStream(is);// 将inputstream转化为Bitmap
                is.close();// 关闭数据
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        else{
            Log.info("json", "json is null!!!");
        }
        return bitmap;
    }

    /**
     * 上传图片
     * @param uploadFile 要上传的文件目录
     * @param actionUrl 上传的地址
     * @return String
     */
    public static String uploadFile(String uploadFile,String actionUrl){
      String end ="\r\n";
      String twoHyphens ="--";
      String boundary ="*****";

      HttpURLConnection con = null;
      DataOutputStream ds = null;
      FileInputStream fStream = null;
      InputStream is = null;
      StringBuffer sb = null;

      try{
        URL url =new URL(actionUrl);
        con=(HttpURLConnection)url.openConnection();
        /* 允许Input、Output，不使用Cache */
        con.setDoInput(true);
        con.setDoOutput(true);
        con.setUseCaches(false);

        /* 设置传送的method=POST */
        con.setRequestMethod("POST");
        /* setRequestProperty */
        con.setRequestProperty("Connection", "Keep-Alive");
        con.setRequestProperty("Charset", "UTF-8");
        con.setRequestProperty("Content-Type","multipart/form-data;boundary="+boundary);
        /* 设置DataOutputStream */
        ds = new DataOutputStream(con.getOutputStream());
        ds.writeBytes(twoHyphens + boundary + end);
        ds.writeBytes("Content-Disposition: form-data; "+ "name=\"file1\";filename=\""+ MyAppActivity.FILENAME +"\""+ end);
        ds.writeBytes(end);
        /* 取得文件的FileInputStream */
        if(uploadFile != null){
            fStream =new FileInputStream(uploadFile);
            /* 设置每次写入1024bytes */
            int bufferSize =1024;
            byte[] buffer =new byte[bufferSize];
            int length =-1;
            /* 从文件读取数据至缓冲区 */
            while((length = fStream.read(buffer)) !=-1){
              /* 将资料写入DataOutputStream中 */
              ds.write(buffer, 0, length);
            }
        }

        ds.writeBytes(end);
        ds.writeBytes(twoHyphens + boundary + twoHyphens + end);
        /* close streams */
        ds.flush();
        /* 取得Response内容 */
        is = con.getInputStream();
        int ch;
        sb =new StringBuffer();
        while( ( ch = is.read() ) !=-1 ){
          sb.append( (char)ch );
        }
        ds.close();
      }catch (MalformedURLException e) {
            Log.info("json","url error");
            e.printStackTrace();
        } catch(FileNotFoundException e){
            Log.info("json","file not found");
        }catch (IOException e) {
            Log.info("json","io error");
            e.printStackTrace();
        }finally{
            try{
                if(ds != null){
                    ds.close();
                }
                if(is != null){
                    is.close();
                }
                if(fStream != null){
                    fStream.close();
                }
            }catch(IOException e){
                e.printStackTrace();
            }
        }
        return sb.toString();
    }