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Merge pull request #6236 from SmartyAnsh/BAEL-2659_Reading_a_file_in_Groovy

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Bael 2659 reading a file in groovy
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Eric Martin 2019-02-08 22:25:28 -06:00 committed by GitHub
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107
core-groovy/src/main/groovy/com/baeldung/file/ReadFile.groovy Normal file
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package com.baeldung.file
class ReadFile {
/**
* reads file content line by line using withReader and reader.readLine
* @param filePath
* @return
*/
int readFileLineByLine(String filePath) {
File file = new File(filePath)
def line, noOfLines = 0;
file.withReader { reader ->
while ((line = reader.readLine())!=null)
{
println "${line}"
noOfLines++
}
}
return noOfLines
}
/**
* reads file content in list of lines
* @param filePath
* @return
*/
List<String> readFileInList(String filePath) {
File file = new File(filePath)
def lines = file.readLines()
return lines
}
/**
* reads file content in string using File.text
* @param filePath
* @return
*/
String readFileString(String filePath) {
File file = new File(filePath)
String fileContent = file.text
return fileContent
}
/**
* reads file content in string with encoding using File.getText
* @param filePath
* @return
*/
String readFileStringWithCharset(String filePath) {
File file = new File(filePath)
String utf8Content = file.getText("UTF-8")
return utf8Content
}
/**
* reads content of binary file and returns byte array
* @param filePath
* @return
*/
byte[] readBinaryFile(String filePath) {
File file = new File(filePath)
byte[] binaryContent = file.bytes
return binaryContent
}
/**
* More Examples of reading a file
* @return
*/
def moreExamples() {
//with reader with utf-8
new File("src/main/resources/utf8Content.html").withReader('UTF-8') { reader ->
def line
while ((line = reader.readLine())!=null) {
println "${line}"
}
}
//collect api
def list = new File("src/main/resources/fileContent.txt").collect {it}
//as operator
def array = new File("src/main/resources/fileContent.txt") as String[]
//eachline
new File("src/main/resources/fileContent.txt").eachLine { line ->
println line
}
//newInputStream with eachLine
def is = new File("src/main/resources/fileContent.txt").newInputStream()
is.eachLine {
println it
}
is.close()
//withInputStream
new File("src/main/resources/fileContent.txt").withInputStream { stream ->
stream.eachLine { line ->
println line
}
}
}
}

3
core-groovy/src/main/resources/fileContent.txt Normal file
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Line 1 : Hello World!!!
Line 2 : This is a file content.
Line 3 : String content

BIN
core-groovy/src/main/resources/sample.png Normal file
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Width:  |  Height:  |  Size: 329 B

12
core-groovy/src/main/resources/utf8Content.html Normal file
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<meta charset="UTF-8">
<body>
<pre>
ᚠᛇᚻ᛫ᛒᛦᚦ᛫ᚠᚱᚩᚠᚢᚱ᛫ᚠᛁᚱᚪ᛫ᚷᛖᚻᚹᛦᛚᚳᚢᛗ
ᛋᚳᛖᚪᛚ᛫ᚦᛖᚪᚻ᛫ᛗᚪᚾᚾᚪ᛫ᚷᛖᚻᚹᛦᛚᚳ᛫ᛗᛁᚳᛚᚢᚾ᛫ᚻᛦᛏ᛫ᛞᚫᛚᚪᚾ
ᚷᛁᚠ᛫ᚻᛖ᛫ᚹᛁᛚᛖ᛫ᚠᚩᚱ᛫ᛞᚱᛁᚻᛏᚾᛖ᛫ᛞᚩᛗᛖᛋ᛫ᚻᛚᛇᛏᚪᚾ
</pre>
</body>
</html>

70
core-groovy/src/test/groovy/com/baeldung/file/ReadFileUnitTest.groovy Normal file
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package com.baeldung.file
import spock.lang.Specification
class ReadFileUnitTest extends Specification {
ReadFile readFile
void setup () {
readFile = new ReadFile()
}
def 'Should return number of lines in File using ReadFile.readFileLineByLine given filePath' () {
given:
def filePath = "src/main/resources/fileContent.txt"
when:
def noOfLines = readFile.readFileLineByLine(filePath)
then:
noOfLines
noOfLines instanceof Integer
assert noOfLines, 3
}
def 'Should return File Content in list of lines using ReadFile.readFileInList given filePath' () {
given:
def filePath = "src/main/resources/fileContent.txt"
when:
def lines = readFile.readFileInList(filePath)
then:
lines
lines instanceof List<String>
assert lines.size(), 3
}
def 'Should return file content in string using ReadFile.readFileString given filePath' () {
given:
def filePath = "src/main/resources/fileContent.txt"
when:
def fileContent = readFile.readFileString(filePath)
then:
fileContent
fileContent instanceof String
fileContent.contains("""Line 1 : Hello World!!!
Line 2 : This is a file content.
Line 3 : String content""")
}
def 'Should return UTF-8 encoded file content in string using ReadFile.readFileStringWithCharset given filePath' () {
given:
def filePath = "src/main/resources/utf8Content.html"
when:
def encodedContent = readFile.readFileStringWithCharset(filePath)
then:
encodedContent
encodedContent instanceof String
}
def 'Should return binary file content in byte array using ReadFile.readBinaryFile given filePath' () {
given:
def filePath = "src/main/resources/sample.png"
when:
def binaryContent = readFile.readBinaryFile(filePath)
then:
binaryContent
binaryContent instanceof byte[]
binaryContent.length == 329
}
}