java HTTPServlet请求。getInputStream()始终接收空行
客户:
public List<String> post(List<String> toWrite){
String result = "";
List<String> allResults = new ArrayList<String>();
try {
openConnection();
connection.setDoOutput(true);
connection.setRequestMethod("POST");
initializeOutputStream();
for(int i = 0; i < toWrite.size(); i++){
out.write(toWrite.get(i));
out.newLine();
}
System.out.println(connection.getResponseCode());
System.out.println(connection.getResponseMessage());
initializeInputStream();
while((result = in.readLine()) != null){
allResults.add(result);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
closeConnection();
}
return allResults;
}
One of the attempts at the host:
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
List<String> incoming = new ArrayList<String>();
// BufferedReader in = req.getReader();
//
// String tmp = in.readLine();
resp.setContentType("text/plain");
PrintWriter out = resp.getWriter();
StringBuilder stringBuilder = new StringBuilder();
BufferedReader bufferedReader = null;
try {
InputStream inputStream = req.getInputStream();
if (inputStream != null) {
bufferedReader = new BufferedReader(new InputStreamReader(
inputStream));
char[] charBuffer = new char[128];
int bytesRead = -1;
//while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
while(bytesRead != -1){
stringBuilder.append(charBuffer, 0, bytesRead);
}
} else {
stringBuilder.append("");
}
} catch (IOException ex) {
throw ex;
} finally {
if (bufferedReader != null) {
try {
bufferedReader.close();
} catch (IOException ex) {
throw ex;
}
}
}
String body = stringBuilder.toString();
System.out.println(body);
out.println(body);
// BufferedReader in = new BufferedReader(new InputStreamReader(req.getInputStream()));
//
// String tmp = "";
//
// //while(!(in.ready())){}
//
// while((tmp = in.readLine()) != null){
// System.out.println(tmp);
// }
//
//
// out.println(tmp);
out.println("end");
}
请注意注释掉的行-这是我尝试从客户那里获取内容的许多其他尝试之一
系统。出来打印出来。来自servlett的println都返回一个空行。程序结束时的“结束”返回时没有问题。这不是在客户端读取多行的问题——如果我将多行输出。println's,然后我读得很好。系统。出来inputstream的println()也返回空白。状态代码是200,因此似乎没有连接错误
有人吗
# 1 楼答案
替换下面的行
与
希望能奏效
# 2 楼答案
在这里,while循环似乎没有任何作用,因为在您的情况下,
bytesRead
始终是-1,因此它永远不会进入循环,而且,您根本不使用bufferedReader
来读取输入流:-试试这个:-