如何将 Groovy 中的文件读入字符串？

Question

我需要从文件系统中读取一个文件并将整个内容加载到 groovy 控制器中的字符串中，最简单的方法是什么？

Answer 1

String fileContents = new File('/path/to/file').text

如果您需要指定字符编码，请改用以下内容：

String fileContents = new File('/path/to/file').getText('UTF-8')

Answer 2

The shortest way is indeed just

String fileContents = new File('/path/to/file').text

but in this case you have no control on how the bytes in the file are interpreted as characters. AFAIK groovy tries to guess the encoding here by looking at the file content.

If you want a specific character encoding you can specify a charset name with

String fileContents = new File('/path/to/file').getText('UTF-8')

See API docs on File.getText(String) for further reference.

Answer 3

A slight variation...

new File('/path/to/file').eachLine { line ->
  println line
}

Answer 4

In my case new File() doesn't work, it causes a FileNotFoundException when run in a Jenkins pipeline job. The following code solved this, and is even easier in my opinion:

def fileContents = readFile "path/to/file"

I still don't understand this difference completely, but maybe it'll help anyone else with the same trouble. Possibly the exception was caused because new File() creates a file on the system which executes the groovy code, which was a different system than the one that contains the file I wanted to read.

Answer 5

the easiest way would be

new File(filename).getText()

which means you could just do:

new File(filename).text

Answer 6

Here you can Find some other way to do the same.

Read file.

File file1 = new File("C:\Build\myfolder\myTestfile.txt");
def String yourData = file1.readLines();

Read Full file.

File file1 = new File("C:\Build\myfolder\myfile.txt");
def String yourData= file1.getText();

Read file Line Bye Line.

File file1 = new File("C:\Build\myfolder\myTestfile.txt");
for (def i=0;i<=30;i++) // specify how many line need to read eg.. 30
{
 log.info file1.readLines().get(i)

}

Create a new file.

new File("C:\Temp\FileName.txt").createNewFile();