java blob存取图片

Connection con=db.conn;
PreparedStatement pstmt;
//File file = upload;
FileInputStream inputImage = new FileInputStream(upload);
byte[] buf = new byte[inputImage.available()];
inputImage.read(buf);
con.setAutoCommit(false);
System.out.println("**before sql**");
try {
pstmt = con.prepareStatement("insert into zzbj_rs_region_detail(id,region_Id,coordinate1,coordinate2,coordinate3,table_Name,rs_id,icon,createTime) values("
+ rdb.getId()+ ","+ rdb.getRegionId()+ ","+ rdb.getCoor1()+ ","+ rdb.getCoor2()+ ","+ rdb.getCoor3()+ ",'"
+ rdb.getTableName()+ "',"+ rdb.getRsId() + ",empty_blob(),sysdate)");//先存入空blob 再修改，可以存入大的图片，首次插入有大小限制，小图片没问题，大了就会报异常
pstmt.executeUpdate();
System.out.println("**afer sql**");
ResultSet rs = pstmt.executeQuery("SELECT icon FROM zzbj_rs_region_detail where id="+ rdb.getId() + " for update");
if (rs.next()) {
oracle.sql.BLOB blob = (oracle.sql.BLOB)rs.getBlob("icon");
OutputStream out = blob.getBinaryOutputStream();
out.write(buf);
out.flush();
out.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
con.commit();

FileInputStream inputImage = new FileInputStream(upload);
byte[] buf = new byte[inputImage.available()];
inputImage.read(buf);
con.setAutoCommit(false);
PreparedStatement pst=con.prepareStatement("SELECT icon FROM zzbj_rs_region_detail where id="+ rdb.getId() + " for update");
ResultSet rs = pst.executeQuery();
if (rs.next()) {
oracle.sql.BLOB blob = (oracle.sql.BLOB)rs.getBlob("icon");
OutputStream out = blob.getBinaryOutputStream();
out.write(buf);
out.flush();
out.close();
}
con.commit();

Connection con=db.conn;
Statement stmt = con.createStatement();
String sql = "select background from zzbj_rs_region where id='"+id+"' ";
ResultSet rs =db.query(sql);
if (rs.next()){
oracle.sql.BLOB b = (oracle.sql.BLOB) rs.getBlob("background");
long size = b.length();
byte[] bs = b.getBytes(1, (int) size);
res.setContentType("image/jpeg");
OutputStream outs = res.getOutputStream();
if(size>1){
outs.write(bs);
outs.flush();}
db.closeDb();
}