Android 使用 base64 将图像上传到服务器 [英] Android upload image to server using base64

问题描述

我正在使用 base64 将图像上传到服务器，如果图像很小，它工作正常，但如果图像很大，它会给我内存异常

尝试{ByteArrayOutputStream 流 = new ByteArrayOutputStream();bitmap.compress(Bitmap.CompressFormat.PNG, 100, 流);位图.recycle();byte[] byteArray = stream.toByteArray();流.关闭()；流 = 空；String ba1 = Base64.encodeToString(byteArray, Base64.DEFAULT);位图 = 空；System.gc();//立即释放位图byteArray = null;System.gc();HttpClient httpclient = new DefaultHttpClient();HttpPost httppost = new HttpPost(Data.upload_photo);JSONObject jsonObj = new JSONObject();jsonObj.put("user_id", LoginParser.id);int cnt = ba1.length()/4;System.out.println("cnt=>" + cnt);jsonObj.put("图像", ba1);jsonObj.put("caption", edt_caption.getText().toString());//创建POST对象并添加参数/** StringEntity entity = new StringEntity(jsonObj.toString(),* HTTP.UTF_8);System.out.println(实体);* entity.setContentType("application/json");* httppost.setEntity(实体);** HttpResponse 响应 = httpclient.execute(httppost);*/StringEntity se = new StringEntity(jsonObj.toString());//se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE,//"应用程序/json"));se.setContentType("应用程序/json");httppost.setEntity(se);HttpResponse 响应 = httpclient.execute(httppost);字符串结果 = EntityUtils.toString(response.getEntity());System.out.println("=>=>" + 结果);JSONObject jsonObject = new JSONObject(result);if (jsonObject.getString("status").equals("success"))返回成功"；别的返回 jsonObject.getString("message");} catch (IOException e) {e.printStackTrace();} catch (JSONException e) {//TODO 自动生成的 catch 块e.printStackTrace();}返回空；}

解决方案

试试这个代码一次.

ByteArrayOutputStream bao = new ByteArrayOutputStream();bm.compress(Bitmap.CompressFormat.JPEG, 90, bao);byte[] ba = bao.toByteArray();String ba1 = Base64.encodeBytes(ba);数组列表<名称值对 >nameValuePairs = 新数组列表<名称值对 >();nameValuePairs.add(new BasicNameValuePair("image", ba1));尝试 {HttpClient httpclient = new DefaultHttpClient();HttpPost httppost = 新HttpPost("URL 字符串");httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));HttpResponse 响应 = httpclient.execute(httppost);HttpEntity entity = response.getEntity();is = entity.getContent();//Toast.makeText(SignUpActivity.this, "加入失败", Toast.LENGTH_SHORT).show();} 捕获(异常 e){Log.e("log_tag", "http 连接错误" + e.toString());}

<块引用>

如果您有任何疑问，我可以帮助您.

I am uploading image to server using base64 its working fine if image is small but if image is big it gives me memory out exception

try {
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
        bitmap.recycle();
        byte[] byteArray = stream.toByteArray();
        stream.close();
        stream = null;
        String ba1 = Base64.encodeToString(byteArray, Base64.DEFAULT);

        bitmap = null;
        System.gc(); // immediately free bitmap

        byteArray = null;
        System.gc();
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost(Data.upload_photo);

        JSONObject jsonObj = new JSONObject();
        jsonObj.put("user_id", LoginParser.id);
        int cnt = ba1.length() / 4;
        System.out.println("cnt=>" + cnt);
        jsonObj.put("image", ba1);

        jsonObj.put("caption", edt_caption.getText().toString());
        // Create the POST object and add the parameters

        /*
         * StringEntity entity = new StringEntity(jsonObj.toString(),
         * HTTP.UTF_8); System.out.println(entity);
         * entity.setContentType("application/json");
         * httppost.setEntity(entity);
         * 
         * HttpResponse response = httpclient.execute(httppost);
         */

        StringEntity se = new StringEntity(jsonObj.toString());
        // se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE,
        // "application/json"));
        se.setContentType("application/json");
        httppost.setEntity(se);
        HttpResponse response = httpclient.execute(httppost);

        String result = EntityUtils.toString(response.getEntity());
        System.out.println("=>=>" + result);
        JSONObject jsonObject = new JSONObject(result);
        if (jsonObject.getString("status").equals("success"))
            return "success";
        else
            return jsonObject.getString("message");
    } catch (IOException e) {
        e.printStackTrace();
    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return null;
}

解决方案

Try this code once.

ByteArrayOutputStream bao = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.JPEG, 90, bao);
byte[] ba = bao.toByteArray();
String ba1 = Base64.encodeBytes(ba);
ArrayList < NameValuePair > nameValuePairs = new
ArrayList < NameValuePair > ();
nameValuePairs.add(new BasicNameValuePair("image", ba1));
try {
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new
    HttpPost("URL STRING");
    httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
    HttpResponse response = httpclient.execute(httppost);
    HttpEntity entity = response.getEntity();
    is = entity.getContent();
    //Toast.makeText(SignUpActivity.this, "Joining Failed", Toast.LENGTH_SHORT).show();
} catch (Exception e) {
    Log.e("log_tag", "Error in http connection " + e.toString());
}

I can help you if you have any doubt.

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