编码不匹配。     DataInputStream ins = new DataInputStream(httpUrl.getInputStream());
    //DataOutputStream out = new DataOutputStream(new FileOutputStream("d:\\2.xml"));
    BufferedWriter out =
        new BufferedWriter(
            new FileWriter("d:\\2.xml"));    //注意这里
    String s = ins.readUTF();
    out.write(s, 0, s.length());    out.close();
    ins.close();