Java：需要从字节数组创建 PDF
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Java: Need to create PDF from byte-Array
提问by AEIOU
From a DB2 table I've got blob which I'm converting to a byte array so I can work with it. I need to take the byte array and create a PDFout of it.
从 DB2 表中，我得到了 blob，我将其转换为字节数组，以便我可以使用它。我需要获取字节数组并从中创建一个PDF。
This is what I have:
这就是我所拥有的：
static void byteArrayToFile(byte[] bArray) {
try {
// Create file
FileWriter fstream = new FileWriter("out.pdf");
BufferedWriter out = new BufferedWriter(fstream);
for (Byte b: bArray) {
out.write(b);
}
out.close();
} catch (Exception e) {
System.err.println("Error: " + e.getMessage());
}
}
But the PDFit creates is not right, it has a bunch of black lines running from top to bottom on it.
但是PDF它创建的不对，它上面有一堆从上到下运行的黑线。
I was actually able to create the correct PDFby writing a web application using essentially the same process. The primary difference between the web application and the code about was this line:
我实际上能够PDF通过使用基本相同的过程编写 Web 应用程序来创建正确的。Web 应用程序和 about 代码之间的主要区别在于这一行：
response.setContentType("application/pdf");
So I know the byte array is a PDFand it can be done, but my code in byteArrayToFilewon't create a clean PDF.
所以我知道字节数组是 aPDF并且可以完成，但是我的代码byteArrayToFile不会创建一个干净的PDF.
Any ideas on how I can make it work?
关于如何使其工作的任何想法？
采纳答案by Jason Orendorff
Sending your output through a FileWriteris corrupting it because the data is bytes, and FileWriters are for writing characters. All you need is:
通过 a 发送输出FileWriter会损坏它，因为数据是字节，而FileWriters 用于写入字符。所有你需要的是：
OutputStream out = new FileOutputStream("out.pdf");
out.write(bArray);
out.close();
回答by dapc
One can utilize the autoclosable interface that was introduced in java 8.
可以利用 java 8 中引入的自动关闭接口。
try (OutputStream out = new FileOutputStream("out.pdf")) {
out.write(bArray);
}
回答by Singh Ss
Read from file or string to bytearray.
从文件或字符串读取到bytearray.
byte[] filedata = null;
String content = new String(bytearray);
content = content.replace("\r", "").replace("\uf8ff", "").replace("'", "").replace("\"", "").replace("`", "");
String[] arrOfStr = content.split("\n");
PDDocument document = new PDDocument();
PDPage page = new PDPage();
document.addPage(page);
try (PDPageContentStream cs = new PDPageContentStream(document, page)) {
// setting font family and font size
cs.beginText();
cs.setFont(PDType1Font.HELVETICA, 14);
cs.setNonStrokingColor(Color.BLACK);
cs.newLineAtOffset(20, 750);
for (String str: arrOfStr) {
cs.newLineAtOffset(0, -15);
cs.showText(str);
}
cs.newLine();
cs.endText();
}
document.save(znaFile);
document.close();
