java读取Oracle中大字段数据（CLOB）的方法

2.Oracle数据库中有一个字段是CLOB类型，使用java 解析.

1.使用java解析clob类型内容

 public String clobToString(Clob c) {
        StringBuffer sb = new StringBuffer(1024);
        Reader instream = null;
        try {
            instream = c.getCharacterStream();
            char[] buffer = new char[(int) c.length()];
            int length = 0;
            while ((length = instream.read(buffer)) != -1) {
                sb.append(buffer, 0, length); 
            }
        } catch (Exception ex) {
            ex.printStackTrace();
            return null;
        } finally {
            try {
                if (instream != null)
                    instream.close();
            } catch (Exception dx) {
                instream = null;
            }
        }
        return sb.toString();
    }

if(pageObject.getResultList() != null && pageObject.getResultList().size() > 0){
           for(int i=0,j=pageObject.getResultList().size(); i < j;i++){
               Map<String,Object> maps = (Map<String, Object>) pageObject.getResultList().get(i);
               maps.put("DISPATCHINGRULESNAME",this.clobToString((Clob) maps.get("DISPATCHINGRULESNAME"))); //这里将Clob类型转化成字符串,调用clobToString((Clob)方法
           }
        }

相关链接:
　　 https://blog.csdn.net/u011342403/article/details/72904827
　 https://blog.csdn.net/u010670151/article/details/52210333
2.使用oracle函数 to_char(字段) 

select to_char(t.billName) as billName from T_CC_SHARE_DISPATCH_RULE t