从基于增量Java的加密文件中读取行

Question

I have an file containing encrypted Json Strings, i am using AES encryption with padding, i have another class which reads these files as input and decrypts the encrypted Json Strings, the problem i am facing is the encrypted json string is being written on multiple lines like

TRX+s0CJYKyKnUJFrFpG77GRxQBDqj4diJhEEmP2sPO0RkgZNeR0acPftfj85ef7WA0ty078rPvk
l3GTb8blA9ytd/SXkaGbp37pLIZilSYoyHTMy/Dd+GiNommta/aqPd5v0CRPda4lKf3tQgGBAw==

i am using Java 8 to read string using File.lines(path), this is giving me only the first line of the encrypted string, instead i need the entire encrpted string to be read into a string object, is there a way to specify different delimiter for File.lines()?. Also please note that the actual encrypted string spans around 10 lines, and the file has large number of documents.

Answer 1

在您的输出上尝试一下。

string.replaceAll(".*\\R.*", "");

Answer 2

Okay here's what i did, I wrote the encrypted strings with a delimiter "," and then used scanner to read from the file, the code goes as below

Scanner x = new Scanner(File);
x.setDelimeter(",");
while(x.hasNext()){
decrypt(x.next());
}

Answer 2: Use a different encoder which doesn't add new lines to the encrypted string, and use the existing File.readLine() method. i used commons io codec base64 encoder.

Answer 3

The Files.lines(path) method itself does not allow for a different delimiter. If you want to retain a similar code style to what you currently have, I would read the file into a single string this way:

String encrypted ="";
for (String line : Files.readAllLines(path)) encrypted += line;

This will fill the string with every line in turn, removing the newlines. If you want them to stay, add them back manually: encrypted += line + "\\n";

That being said, if your method of writing to a file is causing newlines to appear in the file, and you don't want any newlines in the file, the first thing you should re-evaluate is that output, rather than adjusting your method of reading.