clob转换成String

方法一：

  public final static String clob2String(CLOB clob)
  {
    if (clob ==null )
    {
      return ;
    }
   
    StringBuffer sb = new StringBuffer(65535);//64K
    Reader clobStream = null;
    try
    {
      clobStream = clob.getCharacterStream();
      char[] b = new char[60000];//每次获取60K
      int i = 0;
      while((i = clobStream.read(b)) != -1)
      {
        sb.append(b,0,i);
      }
    }
    catch(Exception ex)
    {
      sb = null;
    }
    finally
    {
      try
      {
        if (clobStream != null)
          clobStream.close();
      }
      catch (Exception e)
      {
      }
    }
    if (sb == null)
      return ;
    else
      return sb.toString();
  }

方法二：
   
  public   static   String   clob2string(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);  
  }  
  }  
  catch(Exception   ex){  
  ex.printStackTrace();  
  }  
  finally{  
  try{  
  if(instream   !=   null)   instream.close();  
  }  
  catch(Exception   dx){  
  instream   =   null;  
  }  
  return   sb.toString();  
  }  
  }  
 方法三：

    public String getText(String s)
        throws SQLException
    {
        String s1 = "";
        char ac[] = new char[200];
        CLOB clob = (CLOB)result.getObject(s);
        if(clob == null)
            return null;
        Reader reader = clob.getCharacterStream();
        int i;
        try
        {
            while((i = reader.read(ac, 0, 200)) != -1)
                s1 = s1 + new String(ac, 0, i);
        }
        catch(Exception exception1)
        {
            throw new SQLException(exception1.getMessage());
        }
        finally
        {
            try
            {
                reader.close();
            }
            catch(Exception _ex) { }
        }
        return s1;
    }