我使用HttpURLConnection进行HTTP POST,但并非总能获得完整的响应。我想调试问题,但是逐行执行代码时它可以正常工作。我认为这一定是一个时间问题,所以我添加了Thread.sleep,并确实使我的代码工作了,但这只是一个临时解决方法。我想知道为什么会出现这种情况以及如何解决。以下是我的代码:
public static InputStream doPOST(String input, String inputMimeType, String url, Map<String, String> httpHeaders, String expectedMimeType) throws MalformedURLException, IOException {
URL u = new URL(url);
URLConnection c = u.openConnection();
InputStream in = null;
String mediaType = null;
if (c instanceof HttpURLConnection) {
//c.setConnectTimeout(1000000);
//c.setReadTimeout(1000000);
HttpURLConnection h = (HttpURLConnection)c;
h.setRequestMethod("POST");
//h.setChunkedStreamingMode(-1);
setAccept(h, expectedMimeType);
h.setRequestProperty("Content-Type", inputMimeType);
for(String key: httpHeaders.keySet()) {
h.setRequestProperty(key, httpHeaders.get(key));
if (logger.isDebugEnabled()) {
logger.debug("Request property key : " + key + " / value : " + httpHeaders.get(key));
}
}
h.setDoOutput(true);
h.connect();
OutputStream out = h.getOutputStream();
out.write(input.getBytes());
out.close();
mediaType = h.getContentType();
logger.debug(" ------------------ sleep ------------------ START");
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
logger.debug(" ------------------ sleep ------------------ END");
if (h.getResponseCode() < 400) {
in = h.getInputStream();
} else {
in = h.getErrorStream();
}
}
return in;
}
稍后我将按照以下方式读取输入流:
ByteArrayOutputStream bos = new ByteArrayOutputStream();
while (is.available() > 0) {
bos.write(is.read());
}
is.close();
//is.read(bytes);
if (logger.isDebugEnabled()) {
logger.debug(" Response lenght is : " + is.available());
//logger.debug("RAW response is " + new String(bytes));
logger.debug("RAW response is " + new String(bos.toByteArray()));
}
它生成以下HTTP标头。
POST /emailauthentication/ HTTP/1.1
Accept: application/xml
Content-Type: application/xml
Authorization: OAuth oauth_consumer_key="b465472b-d872-42b9-030e-4e74b9b60e39",oauth_nonce="YnDb5eepuLm%2Fbs",oauth_signature="dbN%2FWeWs2G00mk%2BX6uIi3thJxlM%3D", oauth_signature_method="HMAC-SHA1", oauth_timestamp="1276524919", oauth_token="", oauth_version="1.0"
User-Agent: Java/1.6.0_20
Host: test:6580
Connection: keep-alive
Content-Length: 1107
在其他文章中,建议通过使用 keep-alive
关闭来关闭 keep-alive。
http.keepAlive=false
系统属性,我尝试过这个方法,标头已经更改为
POST /emailauthentication/ HTTP/1.1
Accept: application/xml
Content-Type: application/xml
Authorization: OAuth oauth_consumer_key="b465472b-d872-42b9-030e-4e74b9b60e39", oauth_nonce="Eaiezrj6X4Ttt0", oauth_signature="ND9fAdZMqbYPR2j%2FXUCZmI90rSI%3D", oauth_signature_method="HMAC-SHA1", oauth_timestamp="1276526608", oauth_token="", oauth_version="1.0"
User-Agent: Java/1.6.0_20
Host: test:6580
Connection: close
Content-Length: 1107
连接头是“关闭”,但我仍然无法读取整个响应。有什么想法我做错了什么吗?
h.getInputStream()
来读取它的响应,但实际上你忽略了它和/或者没有展示你如何处理它。 - BalusC