[J2EE] tomcat改80 port

[gh8811211 (大熊)]

環境 eclipse + tomcat7

把Tomcat改80 port之後

eclipse中server端可以正常執行

但java使用HttpURLConnection連結到servlet之檔案

卻無法正常執行

程式碼如下

URL url = new URL("http://localhost/ServletServer/Server");

HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setRequestMethod("POST");
OutputStreamWriter out = new OutputStreamWriter(connection.getOutputStream(),
"UTF-8");

out.write("username=kevin&password=pass");
out.flush();
out.close();

String strLine = "";
String strResponse = "";
InputStream in = connection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
while ((strLine = reader.readLine()) != null)
{
        strResponse += strLine + "\n";
}
System.out.print(strResponse);

錯誤訊息為:

Exception in thread "main" java.io.IOException: Invalid Http response

或是

Exception in thread "main" java.net.SocketException: Software caused
connection abort: recv failed


但在預設的8080 port中

就可以執行正常

不會有任何錯誤

請問為什麼會這樣

敬請指教

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