大字段 CLOB/BOLB与String互转

String s1="1234abc我是大字段CLOB或BOLB"; 

//String 转 clob   
Clob c = new SerialClob(s1.toCharArray()); 
//String 转 blob    
Blob b = new SerialBlob(s1.getBytes("GBK"));
//也可以这样不传字符集名称，使用系统默认的
//Blob b = new SerialBlob(s1.getBytes());

//clob 转 String  
String clobStri = c.getSubString(1, (int) c.length());  
//blob 转 String      
String blobString = new String(b.getBytes(1, (int) b.length()),"GBK");  
//前面若没传入字符集名称，则这里也不需要传入，以免出错
//String blobString = new String(b.getBytes(1, (int) b.length()));        
System.out.println(clobString);        
System.out.println(blobString);

public static String convertToString(Object o){
        if(o == null)
            return null;
        if(o instanceof String){
            return (String)o;
        }else if(o instanceof Integer){
            return o.toString();
        }else if(o instanceof SerializableClob){
            SerializableClob clob = (SerializableClob) o ;
            try {
                return clob.getSubString(1, (int) clob.length());
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
        }
        return o.toString();
    }