将图片以Blob格式存入数据库,再通过Servlet显示到界面

public static void storePicBlog() throws FileNotFoundException, SQLException, IOException{
        Connection conn = JdbcUtil.getConnection();
        File f = new File("1.jpg");
        FileInputStream fis = new FileInputStream(f);
        
        String sql = "insert into pic_test(id,zp) values(?,?)";
        
        PreparedStatement ps = conn.prepareStatement(sql);
        
        ps.setString(1, StringUtil.getUUID());
        ps.setBinaryStream(2, fis, (int)f.length());
        
        ps.executeUpdate();
        
        fis.close();
        ps.close();
        JdbcUtil.release(conn);
    }

public static InputStream getPicInputStream(){
        String id = "f304733361e243779b2340afe20e62bf";
        
         Connection conn = JdbcUtil.getConnection();
         
         PreparedStatement ps = null;
         
         ResultSet rs = null;
         
         InputStream is = null;
         
         String sql = "select zp from pic_test where id= ?";
         
        try {
            
            ps = conn.prepareStatement(sql);
            
            ps.setString(1, id);
            
            rs = ps.executeQuery();
            
            if(rs.next()){
                is = rs.getBlob("zp").getBinaryStream();
            }
            
        } catch (SQLException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        }finally{
            try {
                if(null!=ps){
                    ps.close();
                }
            } catch (SQLException ex) {
                Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
            }
            try {
                if(null!=rs){
                    rs.close();
                }
            } catch (SQLException ex) {
                Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
            }
            JdbcUtil.release(conn);
        }
         
        
        return is;
    }

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("image/jpeg");
        
        InputStream is = Test.getPicInputStream();
        
        if(null!=is){
           
            OutputStream os = response.getOutputStream();
            
            int len;
            
            byte buf[] = new byte[1024];
            
            while((len=is.read(buf))!=-1){
                os.write(buf, 0, len);
            }
            
            is.close();
            os.close();
        }
        
    }