我正在使用java io从可能输出é等字符的服务器中检索文本。 然后使用System.err输出它们，结果是'？'。我正在使用UTF8编码。怎么了？ int len = 0;
char[] buffer = new char[1024];
OutputStream os = sock.getOutputStream();
InputStream is = sock.getInputStream();
os.write(query.getBytes("UTF8"));//iso8859_1"));
Reader reader = new InputStreamReader(is, Charset.forName("UTF-8"));
do {
len = reader.read(buffer);
if (len > 0) {
if (outstring == null) {
outstring = new StringBuffer();
}
outstring.append(buffer, 0, len);
}
} while (len > 0);
System.err.println(outstring);
编辑：刚试过以下代码：
StringBuffer b = new StringBuffer();
for (char c = 'a'; c < 'd'; c++) {
b.append(c);
}
b.append('\u00a5'); // Japanese Yen symbol
b.append('\u01FC'); // Roman AE with acute accent
b.append('\u0391'); // GREEK Capital Alpha
b.append('\u03A9'); // GREEK Capital Omega
for (int i = 0; i < b.length(); i++) {
System.out.println("Character #" + i + " is " + b.charAt(i));
}
System.out.println("Accumulated characters are " + b);
也出现了垃圾：
Character #0 is a Character #1 is b Character #2 is c Character #3 is ¥ Character #4 is ? Character #5 is ? Character #6 is ? Accumulated characters are abc¥???
答案 0 :(得分：2)
首先，验证系统属性（file.encoding）实际上是UTF8。如果是，那么您的问题不是您正在运行的代码，但您的终端程序（或其他输出显示）无法正确呈现输出。
答案 1 :(得分：0)
将其写入文件并检查它是如何发生的。如果它在文件中正确出现，则表示您的错误流存在问题（编码不是UTF-8）。如果还有，因为你的服务器编码中的垃圾字符可能不是UTF-8。
答案 2 :(得分：0)
您的第二个示例为我生成以下输出。
Character #0 is a Character #1 is b Character #2 is c Character #3 is ¥ Character #4 is Ǽ Character #5 is Α Character #6 is Ω Accumulated characters are abc¥ǼΑΩ
此代码生成具有相同内容的正确编码的UTF-8文件。
StringBuilder b = new StringBuilder();
for (char c = 'a'; c < 'd'; c++) {
b.append(c);
}
b.append('\u00a5'); // Japanese Yen symbol
b.append('\u01FC'); // Roman AE with acute accent
b.append('\u0391'); // GREEK Capital Alpha
b.append('\u03A9'); // GREEK Capital Omega
PrintStream out = new PrintStream("temp.txt", "UTF-8");
for (int i = 0; i < b.length(); i++) {
out.println("Character #" + i + " is " + b.charAt(i));
}
out.println("Accumulated characters are " + b);