Java 如何从 HttpURLConnection 读取完整响应？
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How to read full response from HttpURLConnection?
提问by Andrzej
I make some proxy server in andorid which modify http headers, it works ok, but I have to forward full response to 'top layer'.
How I can read whole response (all headers, content, everything) from HttpURLConnection?
我在 andorid 中制作了一些代理服务器来修改 http 标头，它工作正常，但我必须将完整响应转发到“顶层”。
我如何从 HttpURLConnection 读取整个响应（所有标题、内容、所有内容）？
HttpURLConnection httpURLConnection;
URL url = new URL(ADDRESS);
httpURLConnection = (HttpURLConnection) url.openConnection();
// add headers, write output stream, flush
if (httpURLConnection.getResponseCode() == HttpsURLConnection.HTTP_OK)
{
Map<String, List<String>> map = httpURLConnection.getHeaderFields();
System.out.println("Printing Response Header...\n");
for (Map.Entry<String, List<String>> entry : map.entrySet())
{
System.out.println("Key : " + entry.getKey() + " ,Value : " + entry.getValue());
}
return new DataInputStream(httpURLConnection.getInputStream());
}
In getInputStream I received only content it is possible to have some stream with whole reposne?
在 getInputStream 中，我只收到了内容，有可能有一些包含整个 reposne 的流吗？
采纳答案by Sotirios Delimanolis
There's no way to dump the full HTTP response directly using the HttpURLConnection, but you can use its various method to reconstruct it. For example,
无法直接使用 转储完整的 HTTP 响应HttpURLConnection，但您可以使用其各种方法来重建它。例如，
HttpURLConnection httpURLConnection;
URL url = new URL("http://www.google.com");
httpURLConnection = (HttpURLConnection) url.openConnection();
StringBuilder builder = new StringBuilder();
builder.append(httpURLConnection.getResponseCode())
.append(" ")
.append(httpURLConnection.getResponseMessage())
.append("\n");
Map<String, List<String>> map = httpURLConnection.getHeaderFields();
for (Map.Entry<String, List<String>> entry : map.entrySet())
{
if (entry.getKey() == null)
continue;
builder.append( entry.getKey())
.append(": ");
List<String> headerValues = entry.getValue();
Iterator<String> it = headerValues.iterator();
if (it.hasNext()) {
builder.append(it.next());
while (it.hasNext()) {
builder.append(", ")
.append(it.next());
}
}
builder.append("\n");
}
System.out.println(builder);
prints
印刷
200 OK
X-Frame-Options: SAMEORIGIN
Transfer-Encoding: chunked
Date: Tue, 07 Jan 2014 16:06:45 GMT
P3P: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info."
X-XSS-Protection: 1; mode=block
Expires: -1
Alternate-Protocol: 80:quic
Set-Cookie: NID=67=OIu8_xhcxE-UPCSfIoTINvRyOe4ALVhIqan2NUI6LMdRkSJHTPGvNkYeYE--WqPSEPK4c4ubvmjWGUyFgXsa453KHavX9gUeKdzfInU2Q25yWP3YtMhsIhJpUQbYL4gq; expires=Wed, 09-Jul-2014 16:06:45 GMT; path=/; domain=.google.ca; HttpOnly, PREF=ID=4496ed99b812997d:FF=0:TM=1389110805:LM=1389110805:S=jxodjb3UjGJSZGaF; expires=Thu, 07-Jan-2016 16:06:45 GMT; path=/; domain=.google.ca
Content-Type: text/html; charset=ISO-8859-1
Server: gws
Cache-Control: private, max-age=0
You can then get the InputStreamand print its content too.
然后，您也可以获取InputStream并打印其内容。
回答by Greg
It wasn't obvious to me at first when I looked for a similar problem, so I but I found a solution.
当我寻找类似的问题时，起初对我来说并不明显，所以我找到了解决方案。
Read the body response:
阅读身体反应：
readFullyAsString(connection.getInputStream(), "UTF-8");
and this comes from : https://stackoverflow.com/a/10505933/1281350
这来自：https: //stackoverflow.com/a/10505933/1281350
public String readFullyAsString(InputStream inputStream, String encoding) throws IOException {
return readFully(inputStream).toString(encoding);
}
private ByteArrayOutputStream readFully(InputStream inputStream) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int length = 0;
while ((length = inputStream.read(buffer)) != -1) {
baos.write(buffer, 0, length);
}
return baos;
}
