Android 經過Base64上傳圖片到服務器

以前作上傳圖片是採用HttpServlet上傳，不過用了一下Base64上傳圖片後，感受比HttpServlet方便不少，你們也能夠跟着嘗試一下。

前臺圖片處理：（傳Bitmap對象便可）

    /**
     * 經過Base32將Bitmap轉換成Base64字符串
     * @param bit
     * @return
     */
    public String Bitmap2StrByBase64(Bitmap bit){
       ByteArrayOutputStream bos=new ByteArrayOutputStream();
       bit.compress(CompressFormat.JPEG, 40, bos);//參數100表示不壓縮
       byte[] bytes=bos.toByteArray();
       return Base64.encodeToString(bytes, Base64.DEFAULT);
    }

前臺發送數據：（調用setImgByStr()方法，第一個參數imgStr 爲Bitmap轉成Base64的字符串，第二個參數imgName爲圖片的名字，包含後綴名.jpg）

    public static String host = "http://192.168.1.166:8080/ImageServer/";
    
    public static String getContent(String url) throws Exception {

        StringBuilder sb = new StringBuilder();
 
        HttpClient client = new DefaultHttpClient();
        HttpParams httpParams = client.getParams();
        // 設置網絡超時參數
        HttpConnectionParams.setConnectionTimeout(httpParams, 3000);

        HttpConnectionParams.setSoTimeout(httpParams, 5000);
        HttpResponse response = client.execute(new HttpGet(url));
        HttpEntity entity = response.getEntity();
        if (entity != null) {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    entity.getContent(), "UTF-8"), 8192);

            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
            reader.close();

        }

        return sb.toString();
    }
    public static HttpResponse post(Map<String, Object> params, String url) {

        HttpClient client = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);
        httpPost.addHeader("charset", HTTP.UTF_8);
        httpPost.setHeader("Content-Type",
                "application/x-www-form-urlencoded; charset=utf-8");
        HttpResponse response = null;
        if (params != null && params.size() > 0) {
            List<NameValuePair> nameValuepairs = new ArrayList<NameValuePair>();
            for (String key : params.keySet()) {
                nameValuepairs.add(new BasicNameValuePair(key, (String) params
                        .get(key)));
            }
            try {
                httpPost.setEntity(new UrlEncodedFormEntity(nameValuepairs,
                        HTTP.UTF_8));
                response = client.execute(httpPost);
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (RuntimeException e) {
                e.printStackTrace();
            }
        } else {
            try {
                response = client.execute(httpPost);
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        return response;

    }
    public static Object getValues(Map<String, Object> params, String url) {
        String token = "";
        HttpResponse response = post(params, url);
        if (response != null) {
            try {
                token = EntityUtils.toString(response.getEntity());
                response.removeHeaders("operator");
            } catch (ParseException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return token;
    }
    public static Object setImgByStr(String imgStr,String imgName){
        String url =  host+"channel-uploadImage.action";
        Map<String,Object> params = new HashMap<String, Object>();
        params.put("imgStr", imgStr);
        params.put("imgName", imgName);
        return getValues(params, url);
    }

後臺接收數據：

    public void uploadPhoto() {
        //獲取存儲路徑
        HttpServletRequest request = ServletActionContext.getRequest();
        String path = ServletActionContext.getServletContext().getRealPath("/")+"upload";
        File file = new File(path);
        if(!file.exists()){
            file.mkdir();
        }
        String imgPath  = path + request.getParameter("imgName");
        String imgStr = request.getParameter("imgStr");
        boolean flag = string2Image(imgStr, imgPath);
        JacksonUtil.responseJSON(response, flag);
    }

後臺圖片處理：

    /**
     * 經過BASE64Decoder解碼，並生成圖片
     * @param imgStr 解碼後的string
     */
    public boolean string2Image(String imgStr, String imgFilePath) {
        // 對字節數組字符串進行Base64解碼並生成圖片
        if (imgStr == null)
            return false;
        try {
            // Base64解碼
            byte[] b = new BASE64Decoder().decodeBuffer(imgStr);
            for (int i = 0; i < b.length; ++i) {
                if (b[i] < 0) {
                    // 調整異常數據
                    b[i] += 256;
                }
            }
            // 生成Jpeg圖片
            OutputStream out = new FileOutputStream(imgFilePath);
            out.write(b);
            out.flush();
            out.close();
            return true;
        } catch (Exception e) {
            return false;
        }
    }    

OK ! 若是成功上傳前端會接收到true ，反之失敗false。但願對你們有所幫助！