java - 使用 DocumentBuilder 解析 InputStreamReader

Question

我的 Java 经验很少。我试图强制将文档读取为 UTF-8，但在尝试将 InputStream 阅读器连接到文档生成器时遇到了困难。

这是我到目前为止所拥有的:

import javax.xml.xpath.*;
import javax.xml.parsers.*;
import org.w3c.dom.*;


if( pathToFile == null ) throw new Exception("You must supply a pathToFile parameter");

DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();

InputStreamReader in = new InputStreamReader( new FileInputStream( pathToFile ), "utf-8" );

BufferedReader reader = new BufferedReader ( new InputStreamReader ( in ) );

Element records = builder.parse(reader).getDocumentElement();

如果有人能给我一些指导，我将不胜感激

Answer 1

不要将 InputStreamReader 包裹在 InputStreamReader 周围。 (编辑此外，由于没有方法从 Reader 解析 XML，因此您需要将 reader 包装在 InputSource 中):

if( pathToFile == null )
    throw new Exception("You must supply a pathToFile parameter");

DocumentBuilder builder = DocumentBuilderFactory.newInstance()
    .newDocumentBuilder();

InputStreamReader in = new InputStreamReader(
    new FileInputStream( pathToFile ), "utf-8" );

BufferedReader reader = new BufferedReader ( in ); // CHANGED

InputSource input = new InputSource(reader);

Element records = builder.parse(input).getDocumentElement();