JAVA 读取 BLOB

Blob blob = rs.getBlob("article_content");
				InputStream instream = blob.getBinaryStream();
			    int flength=(int)blob.length();
			    byte[] b = new byte[flength];
			    byte[] nb=new byte[1024];
			    int len=0;
			    int tlen=0;
			    while(flength>0){
			    	len=instream.read(nb);
			    	System.arraycopy(nb, 0, b, tlen, len);
			    	tlen+=len;
			        flength-=len;
			    } 
			    instream.close();
			   
				a.setArticleContent(new String(b,"GBK"));