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将图片以Blob格式存入数据库,再通过Servlet显示到界面
1:为了方便测试,直接将1.png图片存入到数据库中.
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); }
2:进行读取操作
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; }
3:测试Servlet,通过浏览器访问此Servlet,一定要设置:
response.setContentType("image/jpeg");浏览器中才可以将图片显示出来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(); } }
将图片以Blob格式存入数据库,再通过Servlet显示到界面
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