diff --git a/core-groovy/src/main/groovy/com/baeldung/file/ReadFile.groovy b/core-groovy/src/main/groovy/com/baeldung/file/ReadFile.groovy new file mode 100644 index 0000000000..4239fa534c --- /dev/null +++ b/core-groovy/src/main/groovy/com/baeldung/file/ReadFile.groovy @@ -0,0 +1,107 @@ +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 "${line}" + noOfLines++ + } + } + return noOfLines + } + + /** + * reads file content in list of lines + * @param filePath + * @return + */ + List readFileInList(String filePath) { + File file = new File(filePath) + def lines = file.readLines() + return lines + } + + /** + * reads file content in string using File.text + * @param filePath + * @return + */ + String readFileString(String filePath) { + File file = new File(filePath) + String fileContent = file.text + return fileContent + } + + /** + * reads file content in string with encoding using File.getText + * @param filePath + * @return + */ + String readFileStringWithCharset(String filePath) { + File file = new File(filePath) + String utf8Content = file.getText("UTF-8") + return utf8Content + } + + /** + * reads content of binary file and returns byte array + * @param filePath + * @return + */ + byte[] readBinaryFile(String filePath) { + File file = new File(filePath) + byte[] binaryContent = file.bytes + return binaryContent + } + + /** + * More Examples of reading a file + * @return + */ + def moreExamples() { + + //with reader with utf-8 + new File("src/main/resources/utf8Content.html").withReader('UTF-8') { reader -> + def line + while ((line = reader.readLine())!=null) { + println "${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 + } + } + } + +} \ No newline at end of file diff --git a/core-groovy/src/main/resources/fileContent.txt b/core-groovy/src/main/resources/fileContent.txt new file mode 100644 index 0000000000..643e4af3de --- /dev/null +++ b/core-groovy/src/main/resources/fileContent.txt @@ -0,0 +1,3 @@ +Line 1 : Hello World!!! +Line 2 : This is a file content. +Line 3 : String content diff --git a/core-groovy/src/main/resources/sample.png b/core-groovy/src/main/resources/sample.png new file mode 100644 index 0000000000..7d473430b7 Binary files /dev/null and b/core-groovy/src/main/resources/sample.png differ diff --git a/core-groovy/src/main/resources/utf8Content.html b/core-groovy/src/main/resources/utf8Content.html new file mode 100644 index 0000000000..61ff338f6c --- /dev/null +++ b/core-groovy/src/main/resources/utf8Content.html @@ -0,0 +1,12 @@ + + + + +
+ᚠᛇᚻ᛫ᛒᛦᚦ᛫ᚠᚱᚩᚠᚢᚱ᛫ᚠᛁᚱᚪ᛫ᚷᛖᚻᚹᛦᛚᚳᚢᛗ
+ᛋᚳᛖᚪᛚ᛫ᚦᛖᚪᚻ᛫ᛗᚪᚾᚾᚪ᛫ᚷᛖᚻᚹᛦᛚᚳ᛫ᛗᛁᚳᛚᚢᚾ᛫ᚻᛦᛏ᛫ᛞᚫᛚᚪᚾ
+ᚷᛁᚠ᛫ᚻᛖ᛫ᚹᛁᛚᛖ᛫ᚠᚩᚱ᛫ᛞᚱᛁᚻᛏᚾᛖ᛫ᛞᚩᛗᛖᛋ᛫ᚻᛚᛇᛏᚪᚾ
+
+ + \ No newline at end of file diff --git a/core-groovy/src/test/groovy/com/baeldung/file/ReadFileUnitTest.groovy b/core-groovy/src/test/groovy/com/baeldung/file/ReadFileUnitTest.groovy new file mode 100644 index 0000000000..a479c265c4 --- /dev/null +++ b/core-groovy/src/test/groovy/com/baeldung/file/ReadFileUnitTest.groovy @@ -0,0 +1,70 @@ +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 + 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 + } + +} \ No newline at end of file