Question

我们的客户使用java代码从数据库中存储为varchar的十六进制字符串中呈现图像。我们想在php中创建一个类似的代码来渲染相同的图像，但是无法这样做。以下是客户端使用的java代码示例。

 variable "photo" is hexadecimal String fetched from database. Further code is convert it into image format
try {
   String photoStr = (String)request.getSession(false).getAttribute("photo");
        byte photo[] =null;
        if(photoStr == null){
            photoStr ="0123456789abcdef";
        }
        photo = new byte[photoStr.length()/2+1];
        int i;
        String str1 = "" ;
        int cnt = 0;
            for(i=0;i<photoStr.length();i=i+2)
            {
                    if(i+1<photoStr.length())
                    str1 = photoStr.substring(i,i+2).trim();
                    else
                    str1 = photoStr.substring(i);
                    Integer val = new Integer(Integer.parseInt(str1,16));
                    photo[cnt] = val.byteValue();
                    cnt++;
            }
        BufferedImage bufferedImage = new BufferedImage (165, 165, BufferedImage.TYPE_INT_RGB);
        ImageIO.setUseCache( false );
        bufferedImage = ImageIO.read (new ByteArrayInputStream(photo));
        ImageIO.write(bufferedImage, "JPEG", outb);
} catch (IOException e) {
        e.printStackTrace();
  }catch (IllegalArgumentException e) {
     try{
        String fontName = "Arial";
        final int fontSize = 16;
        AffineTransform at = new AffineTransform();
        final Font basicFont = new Font(fontName, Font.PLAIN, fontSize);
        final Font font = new Font(fontName, Font.PLAIN, fontSize).deriveFont(at);
        BufferedImage bufferedImage = new BufferedImage(165, 165, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2d = (Graphics2D) bufferedImage.getGraphics();
        g2d.setBackground(Color.WHITE);
        g2d.clearRect(0, 0, 165, 165); 
        g2d.setColor(Color.RED);
        g2d.setFont(basicFont);
        final FontMetrics fm = g2d.getFontMetrics();
        g2d.setFont(font);
        g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
        Rectangle2D rect = fm.getStringBounds("\n\n\n     Photo is not available           \n\n\n", g2d);
        int drop = fm.getDescent();
        int width = Math.min(165,(int) rect.getWidth() + 2 * 2);
        int height = Math.min(165, (int) rect.getHeight() + 2 *100);
        g2d.drawString("\n\n\n         Photo is not available           \n\n\n", drop+1, 125);
        BufferedImage croppedImage = bufferedImage.getSubimage(0, 0, height, width);
        g2d.dispose();
        ImageIO.setUseCache( false );
        ImageIO.write(croppedImage,"JPEG", outb);   
    }catch (IOException e1) {
        e1.printStackTrace();
    }
 }finally{
 out.close();
 }
=

以下是我们用来渲染图像的php代码

<?php
    $conn = mysql_connect("localhost", "root", "");
    mysql_select_db("image");
    $sql = "SELECT * FROM tbl_image where tbl_img_id = '14' "; 
    $result = mysql_query($sql);
?>
<HTML>
<HEAD>
<TITLE>List BLOB Images</TITLE>
<link href="imageStyles.css" rel="stylesheet" type="text/css" />
</HEAD>
<BODY>
<?php
    while($row = mysql_fetch_array($result)) {

        echo $image = base64_encode($row["img"]);
        echo '<img src="data:image/jpg;base64,'.base64_encode($row["img"]).'"/>';
    ?>
        <!--<img src="imageView.php?image_id=<?php //echo $row["img"]; ?>" /><br/>-->


<?php       
    }
    mysql_close($conn);
?>
</BODY>
</HTML>

以下是存储在数据库中的十六进制字符串

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Answer 1

以下应该工作

<BODY>
    <?php
        $image = $row["img"];
        echo '<img src="data:image/jpg;base64,'.base64_encode(hex2bin($image)).'"/>';
    ?>
</BODY>

修改解释它是如何工作的

首先从数据库中获取图像为十六进制字符串

将十六进制字符串转换为二进制

将二进制编码为BASE64字符串

Answer 2

下面的代码可用于从十六进制字符串值中提取图像

<?php 
    $binary_string2=pack("H*",$hex_string2)
    ?>
     <img  src="data:image/jpeg;base64,<?php  echo base64_encode($binary_string);?>" alt="IMG DESC" >
     <img  src="data:image/jpeg;base64,<?php  echo base64_encode($binary_string2);?>" alt="IMG DESC">

将十六进制字符串转换为图像

2 个答案: