Clob转字符串

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通过流进行读取Clob数据，转字符串返回

   public static String clobToString(Clob clob) throws Exception{
        StringBuffer reString = new StringBuffer();
            Reader is = clob.getCharacterStream();
            BufferedReader br = new BufferedReader(is);
            String re = br.readLine();
            while(re != null){
                reString.append(re);
                re = br.readLine();
            }
            br.close();
        return reString.toString();
    }