我目前的任务包括从pdf文件中取出所有对象，然后使用解析出的对象。但是我注意到有一个问题，我的代码跳过了一些流对象。
我完全困惑，希望有人可以帮助指出这里出了什么问题。
下面是主要的解析代码。
void parseRawPDFFile() {
//Transform the bytes obtained from the file into a byte character sequence. This byte character sequence
//object is what allows us to use it in regex.
ByteCharSequence byteCharSequence = new ByteCharSequence(bytesFromFile.toByteArray());
byteCharSequence.getStringFromData();
Pattern pattern = Pattern.compile(SINGLE_OBJECT_REGEX);
Matcher matcher = pattern.matcher(byteCharSequence);
//While we have a match (apparently only one match exists at a time) keep looping over the list.
//When a match is found, get the starting and ending indices and manually cut these out char by char
//and assemble them into a new "ByteArrayOutputStream".
int counterOfDoom = 1;
while (matcher.find() ) {
for (int i = 0; i < matcher.groupCount(); i++) {
ByteArrayOutputStream cutOutArray = cutOutByteArrayOutputStreamFromOriginal(matcher.start(), matcher.end());
System.out.println("----------------------------------------------------");
System.out.println(cutOutArray);
//At this point we have cut out the object and can now send it for processing.
createPDFObject(cutOutArray);
System.out.println(counterOfDoom);
System.out.println("----------------------------------------------------");
counterOfDoom++;
}
}
}
这是 ByteCharSequence 的代码(此代码核心的信用在这里：http://blog.sarah-happy.ca/2013/01/java-regular-expression-on-byte-array.html(
public class ByteCharSequence implements CharSequence {
private final byte[] data;
private final int length;
private final int offset;
public ByteCharSequence(byte[] data) {
this(data, 0, data.length);
}
public ByteCharSequence(byte[] data, int offset, int length) {
this.data = data;
this.offset = offset;
this.length = length;
}
@Override
public int length() {
return this.length;
}
@Override
public char charAt(int index) {
return (char) (data[offset + index] & 0xff);
}
@Override
public CharSequence subSequence(int start, int end) {
return new ByteCharSequence(data, offset + start, end - start);
}
/**
* Get the string from the ByteCharSequence data.
* @return
*/
public String getStringFromData() {
//Load it into the method I know works to convert it to a string... Optimized? Probably not at all.
//But it works...
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
for (byte individualByte: data
) {
byteArrayOutputStream.write(individualByte);
}
return byteArrayOutputStream.toString();
}
}
我目前正在处理的pdf数据：
10 0 obj
<</Filter/FlateDecode/Length 1040>>stream
(Bunch of bytes)
endstream
endobj
12 0 obj
<</Filter/FlateDecode/Length 2574/N 3>>stream
(Bunch of bytes)
endstream
endobj
我试图调查的一些信息。
1：据我了解，数据结构中可以容纳多少应该没有限制。所以尺寸应该不是问题????
将 DOTALL 标志添加到模式编译调用中，以便您的模式与换行符匹配 =(