问题描述
到目前为止,我已经使用以下代码段发送和接收JSON字符串:
till now I've used the following code snippet in order to send and recieve JSON strings:
static private String sendJson(String json,String url){
HttpClient httpClient = new DefaultHttpClient();
String responseString = "";
try {
HttpPost request = new HttpPost(url);
StringEntity params =new StringEntity(json, "UTF-8");
request.addHeader("content-type", "application/json");
request.setEntity(params);
HttpResponse response = httpClient.execute(request);
HttpEntity entity = response.getEntity();
responseString = EntityUtils.toString(entity, "UTF-8");
}catch (Exception ex) {
ex.printStackTrace();
// handle exception here
} finally {
httpClient.getConnectionManager().shutdown();
}
return responseString;
}
即使json字符串包含UTF-8字符,上面的代码也可以完美地工作,并且一切正常.
The code above worked perfect even if the json string contained UTF-8 chars, and everything worked fine.
由于多种原因,我不得不更改发送HTTP发布请求的方式,并使用HttpURLConnection代替apache的HttpClient.这是我的代码:
For several reasons I had to change the way I send HTTP post requests and use HttpURLConnection instead apache's HttpClient. Here's my code:
static private String sendJson(String json,String url){
String responseString = "";
try {
URL m_url = new URL(url);
HttpURLConnection conn = (HttpURLConnection)m_url.openConnection();
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("content-type", "application/json");
DataOutputStream outputStream = new DataOutputStream(conn.getOutputStream());
outputStream.writeBytes(json);
outputStream.flush();
outputStream.close();
BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line;
while ((line = br.readLine()) != null) {
sb.append(line+"\n");
}
br.close();
responseString = sb.toString();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return responseString;
}
此代码对于普通的英语字符很好用,但是在json字符串中似乎不支持UTF-8字符,因为它每次都会失败. (在将json发送到服务器时,服务器会粉碎说utf8无法解码某个字节,但是从服务器接收utf8 json时,我认为它确实起作用,因为我可以查看特殊字符.)
This code works well for normal English characters, but doesn't seem to support UTF-8 characters in the json string, since it fails each time. (when sending json to server, server crushes saying that utf8 cant decode a certain byte, but when recieving utf8 json from server I think it does work since I manage to view the special characters).
服务器完全没有变化,并且可以与以前的代码一起正常工作,因此问题是此新代码段中的100%.
Server didn't change at all and worked fine with previous code, so the problem is 100% on this new code snippet.
有什么想法如何解决json字符串发送问题,以便它支持UTF 8?谢谢
Any idea how to fix the json string sending so it would support UTF 8? Thanks
推荐答案
我认为问题出在这部分:
I think the problem is in this part:
DataOutputStream outputStream = new DataOutputStream(conn.getOutputStream());
outputStream.writeBytes(json);
outputStream.flush();
outputStream.close();
您需要将json编码为UTF-8,而不是这样做
并发送代表UTF-8编码的那些字节.
Instead of doing this you need to encode json as UTF-8
and send those bytes which represent the UTF-8 encoding.
尝试使用此:
Charset.forName("UTF-8").encode(json)
请参阅:
一种更简单的方法是使用BufferedWriter
包装一个OutputStreamWriter
. OutputStreamWriter
知道自己的编码
因此它将为您完成工作(json
字符串的编码工作).
An even simpler approach is to use e.g. a BufferedWriter
wrapping anOutputStreamWriter
. The OutputStreamWriter
knows about its own encoding
and so it will do the work for you (the encoding work of the json
String).
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(conn.getOutputStream(), "UTF-8"));
bw.write(json);
bw.flush();
bw.close();
这篇关于使用HttpURLConnection发送UTF-8字符串的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!