Clob类型转换成String类型

//oracle.sql.Clob类型转换成String类型
    public String ClobToString(Clob clob) {
        String reString = "";
        Reader is = null;
        try {
            is = clob.getCharacterStream();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        // 得到流
        BufferedReader br = new BufferedReader(is);
        String s = null;
        try {
            s = br.readLine();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        StringBuffer sb = new StringBuffer();
        while (s != null) {
            //执行循环将字符串全部取出付值给StringBuffer由StringBuffer转成STRING
            sb.append(s);
            try {
                s = br.readLine();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        reString = sb.toString();
        return reString;
    }