【转】oracle.sql.Clob类型转换成String类型

/**
	 * oracle.sql.Clob类型转换成String类型
	 * 
	 * @param clob
	 * @return
	 */
	public String clobToString(Clob clob) throws Exception {
		if(null == clob || clob.length() == 0){
			return null;
		}
		Reader is = clob.getCharacterStream();
		// 得到流
		BufferedReader br = new BufferedReader(is);
		String str = br.readLine();
		StringBuffer buffer = new StringBuffer();
		while (str != null) {
			buffer.append(str);
			str = br.readLine();
		}
		String reString = buffer.toString();
		return reString;
	}