String s1="1231dsdgasd的颯颯大";

Clob c = new SerialClob(s1.toCharArray());//String 轉 clob
Blob b = new SerialBlob(s1.getBytes("GBK"));//String 轉 blob
// 也可以這樣不傳字符集名稱，默認使用系統的
// Blob b = new SerialBlob(s1.getBytes());

String clobString = c.getSubString(1, (int) c.length());//clob 轉 String
String blobString = new String(b.getBytes(1, (int) b.length()),"GBK");//blob 轉 String
// 前面若沒傳入字符集名稱，則這裏也不需要傳入，以免出錯
// String blobString = new String(b.getBytes(1, (int) b.length()));

System.out.println(clobString);
System.out.println(blobString);

CLOB,BLOB與String互轉。