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implementing BAEL-6833 (#14912)

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Co-authored-by: technoddy <mail.technoddy@gmail.com>
This commit is contained in:
Sam 2023-10-06 20:00:28 -04:00 committed by GitHub
parent 77d51bcb95
commit 5dcd7e88d0
11 changed files with 211 additions and 0 deletions
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21
libraries-io/pom.xml
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@ -5,6 +5,18 @@
<modelVersion>4.0.0</modelVersion>
<artifactId>libraries-io</artifactId>
<name>libraries-io</name>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>17</source>
<target>17</target>
</configuration>
</plugin>
</plugins>
</build>
<parent>
<groupId>com.baeldung</groupId>
@ -34,6 +46,11 @@
<artifactId>zip4j</artifactId>
<version>${zip4j.version}</version>
</dependency>
<dependency>
<groupId>com.opencsv</groupId>
<artifactId>opencsv</artifactId>
<version>${opencsv.version}</version>
</dependency>
</dependencies>
<properties>
@ -42,6 +59,10 @@
<sshj.version>0.27.0</sshj.version>
<vfs.version>2.4</vfs.version>
<zip4j.version>2.9.0</zip4j.version>
<opencsv.version>5.7.1</opencsv.version>
<maven.compiler.source>17</maven.compiler.source>
<maven.compiler.target>17</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
</project>

4
libraries-io/src/main/java/com/baeldung/java/io/pojotocsv/Application.java Normal file
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@ -0,0 +1,4 @@
package com.baeldung.java.io.pojotocsv;
public record Application(String id, String name, Integer age, String created_at) {
}

8
libraries-io/src/main/java/com/baeldung/java/io/pojotocsv/ApplicationWithAnnotation.java Normal file
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@ -0,0 +1,8 @@
package com.baeldung.java.io.pojotocsv;
import com.opencsv.bean.CsvBindByName;
import com.opencsv.bean.CsvBindByPosition;
public record ApplicationWithAnnotation(@CsvBindByName(column = "id", required = true) @CsvBindByPosition(position = 1) String id, @CsvBindByName(column = "name", required = true) @CsvBindByPosition(position = 0) String name,
@CsvBindByName(column = "age", required = true) @CsvBindByPosition(position = 2) Integer age, @CsvBindByName(column = "position", required = true) @CsvBindByPosition(position = 3) String created_at) {
}

55
libraries-io/src/main/java/com/baeldung/java/io/pojotocsv/BeanToCsv.java Normal file
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@ -0,0 +1,55 @@
package com.baeldung.java.io.pojotocsv;
import java.io.FileWriter;
import java.io.IOException;
import java.util.List;
import com.opencsv.CSVWriter;
import com.opencsv.bean.StatefulBeanToCsvBuilder;
import com.opencsv.exceptions.CsvDataTypeMismatchException;
import com.opencsv.exceptions.CsvRequiredFieldEmptyException;
public class BeanToCsv {
public void beanToCSVWithDefault(List<Application> applications) throws Exception {
try (FileWriter writer = new FileWriter("src/main/resources/application.csv")) {
var builder = new StatefulBeanToCsvBuilder<Application>(writer).withQuotechar(CSVWriter.NO_QUOTE_CHARACTER)
.withSeparator(',')
.build();
builder.write(applications);
}
}
public void beanToCSVWithCustomHeaderStrategy(List<Application> applications) throws IOException, CsvRequiredFieldEmptyException, CsvDataTypeMismatchException {
try (FileWriter writer = new FileWriter("src/main/resources/application2.csv")) {
var mappingStrategy = new CustomHeaderStrategy<Application>();
mappingStrategy.setType(Application.class);
var builder = new StatefulBeanToCsvBuilder<Application>(writer).withQuotechar(CSVWriter.NO_QUOTE_CHARACTER)
.withMappingStrategy(mappingStrategy)
.build();
builder.write(applications);
}
}
public void beanToCSVWithCustomPositionStrategy(List<ApplicationWithAnnotation> applications) throws Exception {
try (FileWriter writer = new FileWriter("src/main/resources/application3.csv")) {
var builder = new StatefulBeanToCsvBuilder<ApplicationWithAnnotation>(writer).withQuotechar(CSVWriter.NO_QUOTE_CHARACTER)
.build();
builder.write(applications);
}
}
public void beanToCSVWithCustomHeaderAndPositionStrategy(List<ApplicationWithAnnotation> applications) throws IOException, CsvRequiredFieldEmptyException, CsvDataTypeMismatchException {
try (FileWriter writer = new FileWriter("src/main/resources/application4.csv")) {
var mappingStrategy = new CustomColumnPositionStrategy<ApplicationWithAnnotation>();
mappingStrategy.setType(ApplicationWithAnnotation.class);
var builder = new StatefulBeanToCsvBuilder<ApplicationWithAnnotation>(writer).withQuotechar(CSVWriter.NO_QUOTE_CHARACTER)
.withMappingStrategy(mappingStrategy)
.build();
builder.write(applications);
}
}
}

12
libraries-io/src/main/java/com/baeldung/java/io/pojotocsv/CustomColumnPositionStrategy.java Normal file
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@ -0,0 +1,12 @@
package com.baeldung.java.io.pojotocsv;
import com.opencsv.bean.ColumnPositionMappingStrategy;
import com.opencsv.exceptions.CsvRequiredFieldEmptyException;
public class CustomColumnPositionStrategy<T> extends ColumnPositionMappingStrategy<T> {
@Override
public String[] generateHeader(T bean) throws CsvRequiredFieldEmptyException {
super.generateHeader(bean);
return super.getColumnMapping();
}
}

16
libraries-io/src/main/java/com/baeldung/java/io/pojotocsv/CustomHeaderStrategy.java Normal file
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@ -0,0 +1,16 @@
package com.baeldung.java.io.pojotocsv;
import java.util.Arrays;
import com.opencsv.bean.HeaderColumnNameMappingStrategy;
import com.opencsv.exceptions.CsvRequiredFieldEmptyException;
public class CustomHeaderStrategy<T> extends HeaderColumnNameMappingStrategy<T> {
@Override
public String[] generateHeader(T bean) throws CsvRequiredFieldEmptyException {
String[] header = super.generateHeader(bean);
return Arrays.stream(header)
.map(String::toLowerCase)
.toArray(String[]::new);
}
}

4
libraries-io/src/main/resources/application.csv Normal file
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@ -0,0 +1,4 @@
AGE,CREATED_AT,ID,NAME
34,2023-08-11,123,Sam
44,2023-02-11,456,Tam
54,2023-03-11,890,Jam
1 AGE CREATED_AT ID NAME
2 34 2023-08-11 123 Sam
3 44 2023-02-11 456 Tam
4 54 2023-03-11 890 Jam

4
libraries-io/src/main/resources/application2.csv Normal file
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@ -0,0 +1,4 @@
age,created_at,id,name
34,2023-08-11,123,Sam
44,2023-02-11,456,Tam
54,2023-03-11,890,Jam
1 age created_at id name
2 34 2023-08-11 123 Sam
3 44 2023-02-11 456 Tam
4 54 2023-03-11 890 Jam

3
libraries-io/src/main/resources/application3.csv Normal file
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@ -0,0 +1,3 @@
Sam,123,34,2023-08-11
Tam,456,44,2023-02-11
Jam,789,54,2023-03-11
1 Sam 123 34 2023-08-11
2 Tam 456 44 2023-02-11
3 Jam 789 54 2023-03-11

4
libraries-io/src/main/resources/application4.csv Normal file
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@ -0,0 +1,4 @@
name,id,age,created_at
Sam,123,34,2023-08-11
Tam,456,44,2023-02-11
Jam,789,54,2023-03-11
1 name id age created_at
2 Sam 123 34 2023-08-11
3 Tam 456 44 2023-02-11
4 Jam 789 54 2023-03-11

80
libraries-io/src/test/java/com/baeldung/java/io/pojotocsv/BeanToCsvUnitTest.java Normal file
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@ -0,0 +1,80 @@
package com.baeldung.java.io.pojotocsv;
import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
import java.io.BufferedReader;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
public class BeanToCsvUnitTest {
List<Application> applications = new ArrayList<>();
List<ApplicationWithAnnotation> applicationsWithAnnotation = new ArrayList<>();
@BeforeEach
public void beforeEach() {
applications = List.of(new Application("123", "Sam", 34, "2023-08-11"), new Application("456", "Tam", 44, "2023-02-11"), new Application("890", "Jam", 54, "2023-03-11"));
applicationsWithAnnotation = List.of(new ApplicationWithAnnotation("123", "Sam", 34, "2023-08-11"), new ApplicationWithAnnotation("456", "Tam", 44, "2023-02-11"), new ApplicationWithAnnotation("789", "Jam", 54, "2023-03-11"));
}
@Test
public void givenApplicationPOJO_whenUsingDefaultStrategy_thenReceiveCSVFormatWithAscendingOrderOfField() throws Exception {
BeanToCsv beanToCsv = new BeanToCsv();
beanToCsv.beanToCSVWithDefault(applications);
try (BufferedReader bufferedReader = Files.newBufferedReader(Path.of("src/main/resources/application.csv"))) {
List<String> content = bufferedReader.lines()
.toList();
assertThat(content.get(0)).isEqualTo("AGE,CREATED_AT,ID,NAME");
assertThat(content.get(1)).isEqualTo("34,2023-08-11,123,Sam");
assertThat(content.get(2)).isEqualTo("44,2023-02-11,456,Tam");
assertThat(content.get(3)).isEqualTo("54,2023-03-11,890,Jam");
}
}
@Test
public void givenApplicationPOJO_whenUsingCustomHeaderStrategy_thenReceiveCSVFormatWithCustomHeaders() throws Exception {
BeanToCsv beanToCsv = new BeanToCsv();
beanToCsv.beanToCSVWithCustomHeaderStrategy(applications);
try (BufferedReader bufferedReader = Files.newBufferedReader(Path.of("src/main/resources/application2.csv"))) {
List<String> content = bufferedReader.lines()
.toList();
assertThat(content.get(0)).isEqualTo("age,created_at,id,name");
assertThat(content.get(1)).isEqualTo("34,2023-08-11,123,Sam");
assertThat(content.get(2)).isEqualTo("44,2023-02-11,456,Tam");
assertThat(content.get(3)).isEqualTo("54,2023-03-11,890,Jam");
}
}
@Test
public void givenApplicationPOJOWithAnnotation_whenUsingCustomPositionStrategy_thenReceiveCSVFormatWithCustomPosition() throws Exception {
BeanToCsv beanToCsv = new BeanToCsv();
beanToCsv.beanToCSVWithCustomPositionStrategy(applicationsWithAnnotation);
try (BufferedReader bufferedReader = Files.newBufferedReader(Path.of("src/main/resources/application3.csv"))) {
List<String> content = bufferedReader.lines()
.toList();
assertThat(content.get(0)).isEqualTo("Sam,123,34,2023-08-11");
assertThat(content.get(1)).isEqualTo("Tam,456,44,2023-02-11");
assertThat(content.get(2)).isEqualTo("Jam,789,54,2023-03-11");
}
}
@Test
public void givenApplicationPOJOWithAnnotation_whenUsingCustomHeaderPositionStrategy_thenReceiveCSVFormatWithCustomHeaderPosition() throws Exception {
BeanToCsv beanToCsv = new BeanToCsv();
beanToCsv.beanToCSVWithCustomHeaderAndPositionStrategy(applicationsWithAnnotation);
try (BufferedReader bufferedReader = Files.newBufferedReader(Path.of("src/main/resources/application4.csv"))) {
List<String> content = bufferedReader.lines()
.toList();
assertThat(content.get(0)).isEqualTo("name,id,age,created_at");
assertThat(content.get(1)).isEqualTo("Sam,123,34,2023-08-11");
assertThat(content.get(2)).isEqualTo("Tam,456,44,2023-02-11");
assertThat(content.get(3)).isEqualTo("Jam,789,54,2023-03-11");
}
}
}