Oracle数据库Clob类型Blob类型与String互转

Clob类型为大字段类型默认4000长度，Blob为二进制类型常用存文件数据；这两种大字段类型开发中不会经常遇到，博主整理了这两种大字段与String的转换方法可参考（使用Junit直接测试）其中javax.sql.rowset.serial.SerialClob 和javax.sql.rowset.serial.SerialBlob两个类都是从JDK1.5引入；用到了JDK1.7语法：try…with ，要流实现了Closeable接口就可以使用

1.Blob与String互转

@Testpublic void testGetBlob() {String str ="aaabbbccc";Blob blob = null;try {blob= new javax.sql.rowset.serial.SerialBlob(str.getBytes());} catch (SQLException e) {e.printStackTrace();}// blob 转 Stringtry(InputStream inputStream = blob.getBinaryStream()){byte[] bs = new byte[2048];StringBuffer sb = new StringBuffer();int len =0;while((len=inputStream.read(bs))!=-1) {sb.append(new String(bs,0,len));}System.out.println("blob to String >>"+sb.toString());} catch (IOException e) {e.printStackTrace();} catch (SQLException e1) {e1.printStackTrace();}}

2.Clob与String互转：

@Testpublic void testGetClob() {//String转clobString str ="aaabbbccc";Clob clob = null;try {clob = new javax.sql.rowset.serial.SerialClob(str.toCharArray());} catch (SQLException e1) {e1.printStackTrace();}// clob 转Stringtry(Reader rsReader = clob.getCharacterStream()){char [] chs = new char[2048];StringBuffer sb = new StringBuffer();int i =0;while((i=rsReader.read(chs))!=-1) {sb.append(chs,0,i);}System.out.println("clob to string >>"+sb.toString());}catch (Exception e) {e.printStackTrace();}}