Java - XML中的图像编码 [英] Java - Image encoding in XML

问题描述

我以为我会比较容易地找到一个解决这个问题的办法，但是在这里我呼吁你们从上帝的帮助中把我从这个难题中解脱出来。

所以，我有一个图像，我想使用Java将它存储在一个XML文档中。我以前通过将图像保存为流，将流转换为数组，然后VB的xml类能够将数组编码为base64字符串，从而在VisualBasic中实现了此功能。但是，经过几个小时的淘汰网络，以获得Java的等效解决方案，我已经空手而归。我唯一的成功就是：

  import it.sauronsoftware.base64。*; 
 import java.awt.image.BufferedImage; 
 import org.w3c.dom。*; 
 
 ... 
 
 BufferedImage img; 
元素节点; 
 
 ... 
 
 java.io.ByteArrayOutputStream os = new java.io.ByteArrayOutputStream（）; 
 
 ImageIO.write（img，png，os）; 
 
 byte [] array = Base64.encode（os.toByteArray（））; 
 
 String ss = arrayToString（array，，）; 
 
 node.setTextContent（ss）; 
 
 ... 
 
 private static String arrayToString（byte [] a，String separator）{
 StringBuffer result = new StringBuffer（）; 
 if（a.length> 0）{
 result.append（a [0]）; （int i = 1; i  result.append（separator）; 
 
 result.append（a [i]）; 
} 
} 
 return result.toString（）; 
} 
  

我可以猜测，但是将该过程恢复到当我加载XML文件时，镜像被证明是不可能的。如果任何人有更好的方式对XML文件中的图像进行编码/解码，请向前迈进，即使它只是一个链接到另一个线程，这将是正常的。

提前提醒，

Hoopla。

解决方案

类似的东西（Base64中的编码和解码），它的作用就像一个魅力。以下是我认为您应该做的事情，使用课程来自Apache Commons项目的 Base64

  // ENCODING 
 BufferedImage img = ImageIO.read（new File（image.png））; 
 ByteArrayOutputStream baos = new ByteArrayOutputStream（）; 
 ImageIO.write（img，png，baos）; 
 baos.flush（）; 
 String encodedImage = Base64.encodeToString（baos.toByteArray（））; 
 baos.close（）; //应该在一个finally块内
 node.setTextContent（encodedImage）; //存储在节点
 
 // DECODING 
 String encodedImage = node.getTextContent（）; 
 byte [] bytes = Base64.decode（encodedImage）; 
 BufferedImage image = ImageIO.read（new ByteArrayInputStream（bytes））; 
  

希望有帮助。

I thought I would find a solution to this problem relatively easily, but here I am calling upon the help from ye gods to pull me out of this conundrum.

So, I've got an image and I want to store it in an XML document using Java. I have previously achieved this in VisualBasic by saving the image to a stream, converting the stream to an array, and then VB's xml class was able to encode the array as a base64 string. But, after a couple of hours of scouring the net for an equivalent solution in Java, I've come back empty handed. The only success I have had has been by:

import it.sauronsoftware.base64.*;
import java.awt.image.BufferedImage;
import org.w3c.dom.*;

...

      BufferedImage img;
      Element node;

      ...

      java.io.ByteArrayOutputStream os = new java.io.ByteArrayOutputStream();

      ImageIO.write(img, "png", os);

      byte[] array = Base64.encode(os.toByteArray());

      String ss = arrayToString(array, ",");

      node.setTextContent(ss);

      ...

  private static String arrayToString(byte[] a, String separator) {
    StringBuffer result = new StringBuffer();
    if (a.length > 0) {
        result.append(a[0]);
        for (int i=1; i<a.length; i++) {
            result.append(separator);
            result.append(a[i]);
        }
    }
    return result.toString();
  }

Which is okay I guess, but reversing the process to get it back to an image when I load the XML file has proved impossible. If anyone has a better way to encode/decode an image in an XML file, please step forward, even if it's just a link to another thread that would be fine.

Cheers in advance,

Hoopla.

解决方案

I've done something similar (encoding and decoding in Base64) and it worked like a charm. Here's what I think you should do, using the class Base64 from the Apache Commons project:

 //  ENCODING
 BufferedImage img = ImageIO.read(new File("image.png"));    
 ByteArrayOutputStream baos = new ByteArrayOutputStream();
 ImageIO.write(img, "png", baos);    
 baos.flush();
 String encodedImage = Base64.encodeToString(baos.toByteArray());
 baos.close(); // should be inside a finally block
 node.setTextContent(encodedImage); // store it inside node

 // DECODING
 String encodedImage = node.getTextContent();
 byte[] bytes = Base64.decode(encodedImage);
 BufferedImage image = ImageIO.read(new ByteArrayInputStream(bytes));

Hope it helps.

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