获取BufferedReader中read（）返回的字符 [英] Getting the character returned by read() in BufferedReader

问题描述

如何在 BufferedReader 中将 read（）返回的整数转换为实际字符值，然后将它附加到字符串？ read（）返回表示读取字符的整数。当我这样做时，它不会将实际字符附加到String中。相反，它将整数表示本身附加到String。

How can I convert an integer returned by the read() in a BufferedReader to the actual character value and then append it to a String? The read() returns the integer that represents the character read. How when I do this, it doesn't append the actual character into the String. Instead, it appends the integer representation itself to the String.

int c;
String result = "";

while ((c = bufferedReader.read()) != -1) {
    //Since c is an integer, how can I get the value read by incoming.read() from here?
    response += c;   //This appends the integer read from incoming.read() to the String. I wanted the character read, not the integer representation
}

我该怎么做才能搞定读取的实际数据是什么？

What should I do to get the actual data read?

推荐答案

只需将 c 投射到 char 。

此外，请勿使用 + = 在循环中的字符串上。它是O（n ^ 2），而不是预期的O（n）。改为使用 StringBuilder 或 StringBuffer 。

Also, don't ever use += on a String in a loop. It is O(n^2), rather than the expected O(n). Use StringBuilder or StringBuffer instead.

int c;
StringBuilder response= new StringBuilder();

while ((c = bufferedReader.read()) != -1) {
    // Since c is an integer, cast it to a char.
    // If c isn't -1, it will be in the correct range of char.
    response.append( (char)c ) ;  
}
String result = response.toString();

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