Java 关闭连接导致流关闭错误
我正在使用此函数-Java 关闭连接导致流关闭错误,java,io,stream,httpurlconnection,httpsurlconnection,Java,Io,Stream,Httpurlconnection,Httpsurlconnection,我正在使用此函数- public BufferedReader GetResponse(String url, String urlParameters){ HttpsURLConnection con=null; try{ URL obj = new URL(url); con = (HttpsURLConnection) obj.openConnection(); //add reuqest header co
public BufferedReader GetResponse(String url, String urlParameters){
HttpsURLConnection con=null;
try{
URL obj = new URL(url);
con = (HttpsURLConnection) obj.openConnection();
//add reuqest header
con.setRequestMethod("POST");
// Send post request
con.setDoOutput(true);
DataOutputStream wr = new DataOutputStream(con.getOutputStream());
wr.writeBytes(urlParameters);
wr.flush();
wr.close();
int responseCode = con.getResponseCode();
BufferedReader returnValue= new BufferedReader(new InputStreamReader(con.getInputStream()));
con.disconnect();
return returnValue;
}
catch(Exception e){
System.out.println("--------------------There is an error in response function ");
e.printStackTrace();
LOGGER.error("There is an arror in AjaxCAll function of login controller."+e.getMessage());
LOGGER.debug("There is an arror in AjaxCAll function of login controller.");
return null;
}
finally{
}
}
如果我使用这个-
con.disconnect();
然后我得到java.io.IOException:stream is closed error,
但是如果我评论con.disconnect()行,那么一切都正常。我不知道为什么会这样
调用函数
BufferedReader rd = utilities.GetResponse(url, urlParameters);
// Send post request
String line = "";
try{
while ((line = rd.readLine()) != null) { //getting error here if i close connection in response method
// Parse our JSON response
responsString += line;
JSONParser j = new JSONParser();
JSONObject o = (JSONObject) j.parse(line);
if (o.containsKey("response")) {
restMessage = (Map) o.get("response");
} else {
restMessage = (Map) o;
}
}
} finally{
rd.close();
}
从(HttpsURLConnection扩展的)开始:
如果持久连接在当时处于空闲状态,则调用disconnect()方法可能会关闭底层套接字
在GetResponse()
方法中,作为BufferedReader
获得了对HttpsURLConnection
的InputStream
的引用。但是,当您使用con.disconnect()
时,您关闭了底层的InputStream
在调用GetResponse()
方法的代码中,当您稍后尝试使用返回的BufferedReader
时,您会得到java.io.IOException:stream is closed error
,因为您已经使用con.disconnect()
间接关闭了该流
您需要重新排列代码,以便在完成BufferedReader
之前不调用con.disconnect()
这是一种方法:
GetResponse():
呼叫代码:
HttpsURLConnection con = utilities.GetResponse(url, urlParameters);
if(con == null) {
//stop processing or maybe throw an exception depending on what you want to do.
}
BufferedReader rd = null;
// Send post request
String line = "";
try{
int responseCode = con.getResponseCode(); //what's this for? nothing is being done with the variable
rd = new BufferedReader(new InputStreamReader(con.getInputStream()));
while ((line = rd.readLine()) != null) {
// Parse our JSON response
responsString += line;
JSONParser j = new JSONParser();
JSONObject o = (JSONObject) j.parse(line);
if (o.containsKey("response")) {
restMessage = (Map) o.get("response");
}
else {
restMessage = (Map) o;
}
}
}
catch(Exception e) { //better to catch more specific than Exception
//handle exception
}
finally {
if(rd != null) {
rd.close();
}
con.disconnect(); //we already checked if null above
}
我还尝试关闭了finally block中的连接,但不起作用,同样的事情发生了。这个链接应该会有帮助。@Sarah我已经准备好了,最后尝试了关闭,但没有成功。请阅读我的第一条评论。您能否显示一个调用此
GetResponse()
方法的示例?在这个示例中,disconnect()
确实关闭了InputStream
。这并不一定意味着Oracle的JDK代码完全相同(我找不到HttpsURLConnection
的Oracle源代码),但我希望行为非常相同,以满足中描述的接口。
HttpsURLConnection con = utilities.GetResponse(url, urlParameters);
if(con == null) {
//stop processing or maybe throw an exception depending on what you want to do.
}
BufferedReader rd = null;
// Send post request
String line = "";
try{
int responseCode = con.getResponseCode(); //what's this for? nothing is being done with the variable
rd = new BufferedReader(new InputStreamReader(con.getInputStream()));
while ((line = rd.readLine()) != null) {
// Parse our JSON response
responsString += line;
JSONParser j = new JSONParser();
JSONObject o = (JSONObject) j.parse(line);
if (o.containsKey("response")) {
restMessage = (Map) o.get("response");
}
else {
restMessage = (Map) o;
}
}
}
catch(Exception e) { //better to catch more specific than Exception
//handle exception
}
finally {
if(rd != null) {
rd.close();
}
con.disconnect(); //we already checked if null above
}