Question

我收到了错误io.MalformedByteSequenceException: Invalid byte 2 of 2-byte UTF-8 sequence

解决方案是以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);

我正在阅读网址并将其写入文件 DirectionResponse.xml 。然后读取 DirectionResponse.xml 并将其写为* ppre_DirecionResponse.xml *进行处理。

如何更改此选项以便以UTF-8完成阅读和写作？

Answer 1

首先，您需要在重新打开文件输入之前调用output.close()（或至少调用output.flush()。这可能是导致问题的主要原因。

然后，您不应该使用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：

此类的构造函数假定默认字符编码和默认字节缓冲区大小是合适的。

使用FileWriter时遇到同样的问题。替换这个：

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

有这样的事情：

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

，同样适用于fstream。

Answer 2

Read and Write UTF-8 File in Java

我看到你是用utf-8写的，但没有专门用utf-8阅读。按照我在链接中提供的示例。

try {
   Reader reader =
      new InputStreamReader(
         new FileInputStream(args[0]),"UTF-8");
   BufferedReader fin = new BufferedReader(reader);
   Writer writer =
      new OutputStreamWriter(
         new FileOutputStream(args[1]), "UTF-8");
   BufferedWriter fout = new BufferedWriter(writer);
   String s;
   while ((s=fin.readLine())!=null) {
      fout.write(s);
      fout.newLine();
   }

            //Remember to call close. 
            //calling close on a BufferedReader/BufferedWriter 
            // will automatically call close on its underlying stream 
   fin.close();
   fout.close();
} catch (IOException e) {
   e.printStackTrace();
}

如何读取在utf-8中写这个？

2 个答案: