org.dom4j.DocumentException: no protocol

/**
 * Test
 * <p>
 * Date: 2012-03-13,16:25:20 +0800
 *
 * @version 1.0
 */
public class Test {

    /**
     * @param args
     */
    public static void main(String[] args) {

        try {
            File f = new File("c:\\a.xml");
            BufferedReader rr = new BufferedReader(new InputStreamReader(
                new FileInputStream(f)));
            StringBuffer buf = new StringBuffer();
            String txt = rr.readLine();
            while (txt != null) {
                buf.append(txt).append("\n");
                txt = rr.readLine();
            }

            /**
             * API 使用错误
             */
            SAXReader saxReader = new SAXReader();
            Document document = saxReader.read(new ByteArrayInputStream(buf
                .toString().getBytes("utf-8")));
            List<?> policyNodes = document.selectNodes("//PolicyList/Policy");
            if (policyNodes != null && policyNodes.size() != 0) {
                List<String> policys = new ArrayList<String>();
                for (int i = 0; i < policyNodes.size(); i++) {
                    Element e = (Element) policyNodes.get(i);
                    policys.add(e.attributeValue("ID"));
                }
                System.out.println(policys);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (DocumentException e) {
            e.printStackTrace();
        }

    }
}

错误发生的很不应该，我直接用

saxReader.read（xml）了，事实上read接受xml时候的参数含义为systemId，唉，API啊。。人要仔细。。。老了

 

引用一下这篇：

http://blog.csdn.net/luo_yifan/article/details/6442618