Android 通过Base64上传图片到服务器

之前做上传图片是采用HttpServlet上传，不过用了一下Base64上传图片后，感觉比HttpServlet方便很多，大家也可以跟着尝试一下。

 

前台图片处理：（传Bitmap对象即可）

/**
 * 通过Base32将Bitmap转换成Base64字符串
 * @param bit
 * @return
 */
public String Bitmap2StrByBase64(Bitmap bit){
   ByteArrayOutputStream bos=new ByteArrayOutputStream();
   bit.compress(CompressFormat.JPEG, 40, bos);//参数100表示不压缩
   byte[] bytes=bos.toByteArray();
   return Base64.encodeToString(bytes, Base64.DEFAULT);
}

 

前台发送数据：（調用setImgByStr()方法，第一個參數imgStr 为Bitmap转成Base64的字符串，第二个参数imgName为图片的名字，包含后缀名.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();
    // 设置网络超时参数
    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 + "
");
        }
        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);
}

后台接收数据：

public void uploadPhoto() {
    //获取存储路径
    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);
}

后台图片处理：

/**
 * 通过BASE64Decoder解码，并生成图片
 * @param imgStr 解码后的string
 */
public boolean string2Image(String imgStr, String imgFilePath) {
    // 对字节数组字符串进行Base64解码并生成图片
    if (imgStr == null)
        return false;
    try {
        // Base64解码
        byte[] b = new BASE64Decoder().decodeBuffer(imgStr);
        for (int i = 0; i < b.length; ++i) {
            if (b[i] < 0) {
                // 调整异常数据
                b[i] += 256;
            }
        }
        // 生成Jpeg图片
        OutputStream out = new FileOutputStream(imgFilePath);
        out.write(b);
        out.flush();
        out.close();
        return true;
    } catch (Exception e) {
        return false;
    }
}

OK ! 如果成功上传前端会接收到true ，反之失败false。希望对大家有所帮助！