如何在 Java 的 HTTP 响应中更改字符集编码
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How can i change charset encoding in HTTP response in Java
提问by bourne
I have to fetch some JSON object from a remote server and for that i am using this function which is working great except that for sometime some weird data is getting fetched which i believe is because it is using ASCII charset to decode.
我必须从远程服务器获取一些 JSON 对象，为此我正在使用这个功能很好的函数，但有时会获取一些奇怪的数据，我相信这是因为它使用 ASCII 字符集进行解码。
Please find below thw method that i am using
请在下面找到我正在使用的方法
public HttpResponse call(String serviceURL,String serviceHost,String namespace,String methodName,String payloadKey, String payloadValue) throws ClientProtocolException,IOException,JSONException
{
HttpResponse response = null;
HttpContext HTTP_CONTEXT = new BasicHttpContext();
HTTP_CONTEXT.setAttribute(CoreProtocolPNames.USER_AGENT, "Mozilla/5.0");
HttpPost httppost = new HttpPost(serviceURL);
httppost.setHeader("User-Agent",Constants.USER_AGENT_BROWSER_FIREFOX);
httppost.setHeader("Accept", "application/json, text/javascript, */*");
httppost.setHeader("Accept-Language","en-US,en;q=0.8");
httppost.setHeader("Content-Encoding", "foo-1.0");
httppost.setHeader("Content-Type", "application/json; charset=UTF-8");
httppost.setHeader("X-Requested-With","XMLHttpRequest");
httppost.setHeader("Host",serviceHost);
httppost.setHeader("X-Foo-Target", String.format("%s.%s", namespace,methodName));
/*Making Payload*/
JSONObject objectForPayload = new JSONObject();
objectForPayload.put(payloadKey, payloadValue);
StringEntity stringentity = new StringEntity(objectForPayload.toString());
httppost.setEntity(stringentity);
response = client.execute(httppost);
return response;
}
All these headers that i am passing are correct and i have verified the same via inspect element in Google chrome or Firebug plugin if you are familiar with Mozilla.
我传递的所有这些标头都是正确的，如果您熟悉 Mozilla，我已经通过 Google chrome 或 Firebug 插件中的检查元素验证了相同的信息。
Now the problem is that most of the time i am getting the readable data but sometimes i do get unreadable data.
现在的问题是，大部分时间我都得到了可读的数据，但有时我确实得到了不可读的数据。
I debugged using eclipse and noticed that the charset under wrappedEntity is showing as "US-ASCII". I am attaching a jpg for reference
我使用 eclipse 进行调试，并注意到wrappedEntity 下的字符集显示为“US-ASCII”。我附上一张 jpg 以供参考
Can someone please tell me how can i change the charset from ASCII to UTF-8 of the response before i do response = client.execute(httppost);.
PS:As you have noticed that i am passing charset=utf-8 in the header and that i have already verified using firebug and google chrome that i am passing the exact headers .
有人可以告诉我如何在我做之前将响应的字符集从 ASCII 更改为 UTF-8 response = client.execute(httppost);。PS：正如您所注意到的，我在标头中传递了 charset=utf-8 并且我已经使用 firebug 和 google chrome 验证了我正在传递确切的标头。
Please zoom in to see the image more clearly
请放大以更清楚地查看图像
Thanks in advance
提前致谢
回答by geby
You may need to add an "Accept-Encoding"-header and set this to "UTF-8"
您可能需要添加“接受编码”标头并将其设置为“UTF-8”
回答by lscoughlin
I don't think it's a problem with your headers, I think it's a problem with your string. Just having the header say it's utf-8 doesn't mean the string you write is utf-8, and that depends a lot on how the string was encoded and what's in the "payloadValue"
我不认为这是你的标题的问题，我认为这是你的字符串的问题。只是让标题说它是 utf-8 并不意味着你写的字符串是 utf-8，这在很大程度上取决于字符串的编码方式以及“payloadValue”中的内容
That said, you can always re-encode the thing correctly before sending it across the wire, for example:
也就是说，您始终可以在通过网络发送之前正确地重新编码事物，例如：
objectForPayload.put(payloadKey, payloadValue);
StringEntity stringentity = new StringEntity(
new String(
objectForPayload.toString().getBytes(),
"UTF8"));
See if that works for you.
看看这是否适合你。
回答by bourne
i was able to resolve the issue just mentioning it for people that may face similar issue.
after getting the response first get the entity by using
HttpEntity entity = response.getEntity();and since my response was a json object convert entity to string but using "UTF-8" something like this
responseJsonObject = new JSONObject(EntityUtils.toString(entity,"UTF-8"));
我能够解决这个问题，只是为可能面临类似问题的人提到它。获得响应后首先通过使用获取实体
HttpEntity entity = response.getEntity();，因为我的响应是一个 json 对象，将实体转换为字符串，但使用“UTF-8”这样的东西
responseJsonObject = new JSONObject(EntityUtils.toString(entity,"UTF-8"));
previously i was just doing
responseJsonObject = new JSONObject(EntityUtils.toString(entity));
以前我只是在做
responseJsonObject = new JSONObject(EntityUtils.toString(entity));
回答by Julian Reschke
Just for the record: the "Content-Encoding" header field is incorrect - a correct server would reject the request as it contains an undefined content coding format.
只是为了记录：“内容编码”标头字段不正确 - 正确的服务器会拒绝请求，因为它包含未定义的内容编码格式。
Furthermore, attaching a charset parameter to application/json is meaningless.
此外，将字符集参数附加到 application/json 是没有意义的。
