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BAEL-2499 Write to CSV in Java - updated (#6135) 

* example code for Article How to Write to a CSV File in Java

* Updated to use a Stream

* Updated to use Streams in convertToCSV for BAEL-2499
This commit is contained in:
Amy DeGregorio 2019-01-15 15:31:37 -05:00 committed by Grzegorz Piwowarek
parent 7397ac956c
commit 0bfa50825b
2 changed files with 7 additions and 11 deletions
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16
core-java-io/src/main/java/com/baeldung/csv/WriteCsvFileExample.java
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@ -1,18 +1,14 @@
package com.baeldung.csv; package com.baeldung.csv;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class WriteCsvFileExample { public class WriteCsvFileExample {
public String convertToCSV(String[] data) { public String convertToCSV(String[] data) {
StringBuilder csvLine = new StringBuilder(); return Stream.of(data)
.map(this::escapeSpecialCharacters)
for (int i = 0; i < data.length; i++) { .collect(Collectors.joining(","));
if (i > 0) {
csvLine.append(",");
}
csvLine.append(escapeSpecialCharacters(data[i]));
}
return csvLine.toString();
} }
public String escapeSpecialCharacters(String data) { public String escapeSpecialCharacters(String data) {

2
core-java-io/src/test/java/com/baeldung/csv/WriteCsvFileExampleUnitTest.java
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@ -65,7 +65,7 @@ public class WriteCsvFileExampleUnitTest {
} }
@Test @Test
public void givenBufferedWriter_whenWriteLine_thenOutputCreated() { public void givenDataArray_whenConvertToCSV_thenOutputCreated() {
List<String[]> dataLines = new ArrayList<String[]>(); List<String[]> dataLines = new ArrayList<String[]>();
dataLines.add(new String[] { "John", "Doe", "38", "Comment Data\nAnother line of comment data" }); dataLines.add(new String[] { "John", "Doe", "38", "Comment Data\nAnother line of comment data" });
dataLines.add(new String[] { "Jane", "Doe, Jr.", "19", "She said \"I'm being quoted\"" }); dataLines.add(new String[] { "Jane", "Doe, Jr.", "19", "She said \"I'm being quoted\"" });