android 服务器500,okHttp异步上传图片到服务器得到Internal server error(500)错误的解决办法：...

最新推荐文章于 2023-08-01 10:02:23 发布

转载最新推荐文章于 2023-08-01 10:02:23 发布 · 1.4k 阅读

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本文详细介绍了在Android应用中使用OkHttp异步上传图片到Django服务器时遇到500 Internal Server Error的问题及解决方案。问题根源在于服务器端模型存储方式处理不当，通过检查模型对象是否存在来正确创建或更新头像。

这是一个巨坑，先上源码：

//Android

/**

* 上传图像到服务器

* @param img

public void uploadImgToServer(File img) throws UnsupportedEncodingException {

sp = mContext.getSharedPreferences("member_log", Context.MODE_PRIVATE);

String fileName = sp.getString("username","");

String finalName = URLEncoder.encode(fileName,"utf-8");//解析中文到GBK编码

MediaType MEDIA_TYPE_JPG = MediaType.parse("application/x-www-form-urlencoded");

RequestBody requestBody = MultipartBody.create(MEDIA_TYPE_JPG,img);

// String finalName = getValueEncoded(fileName);

// 把我坑的一上午你妈的，老子一致在NetUtils

// 里面转悠，没有想到你是发送到服务器的最后一步。

MultipartBody.Builder builder = new MultipartBody.Builder()

.setType(MultipartBody.FORM)

.addFormDataPart("title","Logo")

.addFormDataPart("img",finalName+".jpg", //封装上传图片的参数

requestBody);

//ReqestBody中要携带参数

RequestBody multipartBody = builder.build();//Build a instance of RequestBody

String url = "http://192.168.1.117:8080/polls/uploadHeadImg/";

Request request = new Request.Builder()

.url(url)

// .addHeader("Accept","text/plain")

.addHeader("Accept-Charset", "UTF-8")

// .addHeader("Content-Type","application/x-www-form-urlencoded; charset=utf-8")

.post(multipartBody)

.build();

Call call = client.newCall(request);

call.enqueue(new Callback() {

@Override

public void onFailure(Call call, IOException e) {

Log.e("TAG","onFaile:" +e);

Thread thread = new Thread(() -> {

Looper.prepare();

Toast.makeText(mContext,"上传失败",Toast.LENGTH_LONG).show();

Looper.loop();

});

thread.start();

}

@Override

public void onResponse(Call call, Response response) throws IOException {

Log.e("TAG","success");

if(!response.isSuccessful()){

Thread thread = new Thread(() -> {

Looper.prepare();

Toast.makeText(mContext,"上传成功,请求失败",

Toast.LENGTH_LONG).show();

Looper.loop();

});

thread.start();

}else{

Thread thread = new Thread(() -> {

Looper.prepare();

try {

Toast.makeText(mContext,"上传成功,返回信息:"+response.body().string(),

Toast.LENGTH_LONG).show();

} catch (IOException e) {

e.printStackTrace();

}

Looper.loop();

});

thread.start();

}

});

}

贴出Django代码：

# Add member head portrait

@csrf_exempt

def uploadHeadImg(request):

source = request.FILES.get('img')

if source:

firstName = source.name

secondName = os.path.splitext(firstName)[0]#Double check trim the blank.

finalName = unquote(secondName)

source.name = finalName+".jpg"

member = Member.objects.get(user_name=finalName)

member.attribute_set.create(head_img=source, name=finalName, last_login_time=timezone.now())

return HttpResponse(source.name+"upload success", content_type="text/plain")

else:

return HttpResponse(source.name+"Failed", content_type="text/plain")

以上代码亲测upload server picture没有任何问题，可是奇怪的现象出现了，在onResponse中 response.code() 得到http error code 500，我找了N多个博文，大多数都是在StackOverflow上面，都说的要么很深，要么驴头不对马嘴，都没有解决。最后发现，问题出现在你的服务器上是否存在文件，如果不存在就需要用create的方式，如果存在了，注意:就一定要用我列举的第二种方式，要不然就会一直返回500如下：

改变model的存储方式需要判断，正确的代码如下：

# Add member head portrait

@csrf_exempt

def uploadHeadImg(request):

source = request.FILES.get('img')

if source:

firstName = source.name

secondName = os.path.splitext(firstName)[0]#Double check trim the blank.

finalName = unquote(secondName)

source.name = finalName+".jpg"

member = Member.objects.get(user_name=finalName)

if member.attribute_set.all().exists():#先判断查询集里面是否有模型对象如果没有说明是第一次设置头像，并不是修改头像。