android：解析大部分数据
我正在玩 android 并尝试接收文件（pdf 书）。为此，我编写了 Servelt，将书编码为 Base64 字符串并将其放入 XML 文档中。该文档还包含姓名、作者和 IBSN 字段。我成功收到了。如果是一本小书，我什至可以解码并打开它。但如果大小超过 2mb，我会收到 OutOfMeoryError。 我的解析器代码是：
public void characters(char[] ch, int start, int length)
throws SAXException {
if(builder==null) builder = new StringBuilder();
builder.append(new String(ch, start, length));
然后我执行以下操作：
fos = new FileOutputStream(Environment.getExternalStorageDirectory().toString()+"/book.pdf", false);
byte[] toWrite = Base64.decode(builder.toString(), Base64.DEFAULT);
fos.write(toWrite);
fos.flush();
fos.close();
有谁知道如何解析它而不会出现错误？我试图解析它 字符方法（我的意思是使用小缓冲区）但它失败了...非法的 base 64 字符串。
I'm playing with android and trying to receive file (pdf book). To do this I wrote Servelt that encode the book into base64 string and put it in the XML document. That document contains name, author and IBSN fields also. I successfully receve it. In case of a small book I can even decode it and open. But if the size is more than 2mb I get OutOfMeoryError.
My parser code is:
public void characters(char[] ch, int start, int length)
throws SAXException {
if(builder==null) builder = new StringBuilder();
builder.append(new String(ch, start, length));
Then I do the following:
fos = new FileOutputStream(Environment.getExternalStorageDirectory().toString()+"/book.pdf", false);
byte[] toWrite = Base64.decode(builder.toString(), Base64.DEFAULT);
fos.write(toWrite);
fos.flush();
fos.close();
Does anybody know how can I parse it wothout error? I've tried to parse it in
characters method (I mean using small buffer) but it fails... Illegal base 64 string.
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您很可能不能，因为没有足够的 RAM 可供您使用。
明智的程序员不会将大型二进制文件转换为“base64 字符串并将其放入 XML 文档中”。明智的程序员会：
除了这三个之外，可能还有其他解决方案，但它们应该为您提供一个起点。
You can't, most likely, as there is not enough RAM for you to work with.
Sensible programmers would not convert a large binary file into "base64 string and put it in the XML document". Sensible programmers would:
There may be other solutions than those three, but they should give you a starting point.