将汉字从一个文件写入另一个文件

Question

我有一个文件里面有中文文本，我想把这些文本复制到另一个文件。但是文件输出与中文字符混淆。请注意，在我的代码中，我已经使用"UTF8"作为编码:

BufferedReader br = new BufferedReader(new FileReader(inputXml));
StringBuilder sb = new StringBuilder();
String line = br.readLine();
while (line != null) {
sb.append(line);
sb.append("n");
line = br.readLine();
}
String everythingUpdate = sb.toString();
Writer out = new BufferedWriter(new OutputStreamWriter(
        new FileOutputStream(outputXml), "UTF8"));
out.write("");
out.write(everythingUpdate);
out.flush();
out.close();

Answer 1

@hyde的答案是有效的，但我有两个额外的注意事项，我将在下面的代码中指出。

当然，你可以根据自己的需要重新组织代码

// Try with resource is used here to guarantee that the IO resources are properly closed
// Your code does not do that properly, the input part is not closed at all
// the output an in case of an exception, will not be closed as well
try (BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(inputXML), "UTF-8"));
    PrintWriter out = new PrintWriter(new OutputStreamWriter(new FileOutputStream(outputXML), "UTF8"))) {
    String line = reader.readLine();
    while (line != null) {
    out.println("");
    out.println(line);
    // It is highly recommended to use the line separator and other such
    // properties according to your host, so using System.getProperty("line.separator")
    // will guarantee that you are using the proper line separator for your host
    out.println(System.getProperty("line.separator"));
    line = reader.readLine();
    }
} catch (IOException e) {
  e.printStackTrace();
}

Answer 2

在这种情况下不应该使用FileReader，因为它不允许指定输入编码。在FileInputStream上构造一个InputStreamReader

像这样:

BufferedReader br = 
        new BufferedReader(
            new InputStreamReader(
                new FileInputStream(inputXml), 
                "UTF8"));