java - 如何用utf-8读写这个？

Question

我遇到错误 io.MalformedByteSequenceException: Invalid byte 2 of 2-byte UTF-8 sequence

解决办法是用UTF-8读写文件。

我的代码是:

InputStream input = null;
OutputStream output = null;
OutputStreamWriter bufferedWriter = new OutputStreamWriter( output, "UTF8");
input = new URL(url).openStream();
output = new FileOutputStream("DirectionResponse.xml");
byte[] buffer = new byte[1024];
for (int length = 0; (length = input.read(buffer)) > 0;) {
   output.write(buffer, 0, length);
}
BufferedReader br = new BufferedReader(new FileReader("DirectionResponse.xml" ));
FileWriter fstream = new FileWriter("ppre_DirectionResponse.xml");
BufferedWriter out = new BufferedWriter(fstream);

我正在读取一个 url 并将其写入文件 DirectionResponse.xml。然后读取DirectionResponse.xml并写入与*ppre_DirecionResponse.xml*相同的内容进行处理。

如何更改此设置以便以 UTF-8 完成读写？

Answer 1

首先，在重新打开文件进行输入之前，您需要调用 output.close()(或至少调用 output.flush())。这可能是您遇到问题的主要原因。

然后，您不应为此使用 FileReader 或 FileWriter，因为它始终使用平台默认编码(通常不是 UTF-8)。来自 the docs for FileReader :

The constructors of this class assume that the default character encoding and the default byte-buffer size are appropriate.

您在使用 FileWriter 时遇到同样的问题。替换为:

BufferedReader br = new BufferedReader(new FileReader("DirectionResponse.xml" ));

像这样:

BufferedReader br = new BufferedReader(new InputStreamReader(
    new FileInputStream("DirectionResponse.xml"), "UTF-8"));

fstream 也是如此。