PushbackInputStream 读取GBK字符时,会将双引号变成单引号

如: <!---->xml version="1.0" encoding="GBK"

PushbackInputStream 读取后,会变成:  <!---->xml version='1.0' encoding='GBK'

而UTF-8不会!

java 代码

public static void  testStream() throws IOException{
    int MAX=2048;
    URL url=new URL("http://www.open-open.com/indexrss.xml");
/       URL url=new URL("http://www.blogjava.net/kukoo/Rss.aspx");
    InputStream input=url.openStream();
    byte bytes[]=new byte[MAX];
    PushbackInputStream bfInput=new PushbackInputStream(input);
    OutputStream out=new FileOutputStream(new File("e:/temp/rss.xml"));
    BufferedOutputStream bfOut=new BufferedOutputStream(out);
    int read=0;
    int totalBytes=0;
    int offset = 0;
    int max = MAX;
    while((read=bfInput.read(bytes,offset,max))!=-1&&offset
        totalBytes+=read;
        bfOut.write(bytes, offset, max);
        offset+=read;
        max-=read;
        System.out.println("read:"+read+"total:"+totalBytes);
    }

    System.out.println(read+":"+totalBytes);
    bfOut.flush();
    bfOut.close();
    bfInput.close();
    Reader reader=new InputStreamReader(new ByteArrayInputStream(bytes,0,offset));
    BufferedReader bufferReader=new BufferedReader(reader);
    String longer=bufferReader.readLine();
    System.out.println(""+longer);
}