如何使用 BOM InputStream 排除 BOM [英] How to exclude BOM with BOM InputStream

问题描述

我试图弄清楚如何在使用 Apache 给出的示例时简单地排除 BOM.我正在从 Internal Storage 读取文件，并首先将其转换为 String.然后我将它转换为 ByteArray 以便我得到一个 InputStream.然后我使用 BOMInputStream 检查 BOM，因为我有意外令牌"错误.现在我不知道如何排除 BOM(如果我有的话).

I am trying to figure out how to simply exclude the BOM while using the example given by Apache. I am reading a file from Internal Storage and converting it first into a String. Then I convert it into ByteArray so that I get an InputStream. Then I check with BOMInputStream for BOMs, since I had errors for "Unexpected Tokens". Now I don't know how to exclude the BOM if I have it.

代码:

StringBuffer fileContent = new StringBuffer("");
String temp = "";
int ch;
try{
    FileInputStream fis = ctx.openFileInput("dataxml");
try {
    while( (ch = fis.read()) != -1)
        fileContent.append((char)ch);
        temp = temp + Character.toString((char)ch);
} catch (IOException e) {
    e.printStackTrace();
}
} catch (FileNotFoundException e) {
    e.printStackTrace();
}


InputStream ins = new ByteArrayInputStream(temp.getBytes(StandardCharsets.UTF_8));
BOMInputStream bomIn = new BOMInputStream(ins);
if (bomIn.hasBOM()) {
    // has a UTF-8 BOM

}

xpp.setInput(ins,"UTF-8");
parseXMLAndStoreIt(xpp);
ins.close();

文件名为dataxml"，我和openFileOutput存储在不同的Class中.

The filename is "dataxml", which I store in different Class with openFileOutput.

推荐答案

您可以在 BOMInputStream 中包装初始流:

You can wrap initial stream in BOMInputStream:

    InputStream stream = new BOMInputStream(inputStream);
    // code using stream goes here

这种方式 stream 自动跳过 BOM 前缀.BOMInputStream 存在于 Apache Commons IO 库中.

This way stream skips BOM prefix automagically. BOMInputStream lives in Apache Commons IO library.

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