java - StatefulBeanToCsv with Column headers

Java - StatefulBeanToCsv with Column headers

If you want to use the StatefulBeanToCsv class in Java to write CSV data with column headers, you can achieve this by using the write method and providing a custom MappingStrategy that includes the header information. Here's an example:

import com.opencsv.CSVWriter; import com.opencsv.bean.*; import java.io.FileWriter; import java.util.Arrays; import java.util.List; public class CsvWriterWithHeaders { public static void main(String[] args) throws Exception { // Sample data List<MyBean> data = Arrays.asList( new MyBean("John", 30, "Engineer"), new MyBean("Alice", 25, "Designer"), new MyBean("Bob", 35, "Manager") ); // Output CSV file path String csvFilePath = "output.csv"; // Create the StatefulBeanToCsv object with a custom MappingStrategy StatefulBeanToCsv<MyBean> beanToCsv = new StatefulBeanToCsvBuilder<MyBean>(new FileWriter(csvFilePath)) .withMappingStrategy(createMappingStrategy()) .build(); // Write the data to CSV beanToCsv.write(data); System.out.println("CSV file written successfully."); } private static MappingStrategy<MyBean> createMappingStrategy() { HeaderColumnNameMappingStrategy<MyBean> strategy = new HeaderColumnNameMappingStrategy<>(); strategy.setType(MyBean.class); return strategy; } // Sample bean class public static class MyBean { @CsvBindByName(column = "Name") private String name; @CsvBindByName(column = "Age") private int age; @CsvBindByName(column = "Occupation") private String occupation; // Constructors, getters, and setters (omitted for brevity) public MyBean(String name, int age, String occupation) { this.name = name; this.age = age; this.occupation = occupation; } } }

In this example:

  1. The MyBean class represents the data you want to write to the CSV file.

  2. The HeaderColumnNameMappingStrategy is used to map the bean properties to CSV columns. The @CsvBindByName annotation is used to specify the column names.

  3. The StatefulBeanToCsvBuilder is used to create a StatefulBeanToCsv instance with the custom mapping strategy.

  4. The beanToCsv.write(data) method is used to write the data to the CSV file.

This example uses the OpenCSV library (com.opencsv) for CSV processing. Make sure to include the OpenCSV library in your project dependencies.

Examples

  1. "Java StatefulBeanToCsv with Column headers example"

    • Code:
      StatefulBeanToCsv<MyBean> csvWriter = new StatefulBeanToCsvBuilder<MyBean>(writer) .withQuotechar(CSVWriter.NO_QUOTE_CHARACTER) .withSeparator(',') .withLineEnd(CSVWriter.DEFAULT_LINE_END) .build(); csvWriter.write(Collections.singletonList("Column Header 1", "Column Header 2")); csvWriter.write(myBeanList); csvWriter.close();
    • Description: Demonstrates using StatefulBeanToCsv to write CSV data with specified column headers before writing the actual bean data.

  2. "Java StatefulBeanToCsv addHeaderColumnNameMapping example"

    • Code:
      Map<String, String> columnMapping = new HashMap<>(); columnMapping.put("field1", "Column Header 1"); columnMapping.put("field2", "Column Header 2"); StatefulBeanToCsv<MyBean> csvWriter = new StatefulBeanToCsvBuilder<MyBean>(writer) .withMappingStrategy(new ColumnPositionMappingStrategy<>(columnMapping)) .withQuotechar(CSVWriter.NO_QUOTE_CHARACTER) .withSeparator(',') .withLineEnd(CSVWriter.DEFAULT_LINE_END) .build(); csvWriter.write(myBeanList); csvWriter.close();
    • Description: Uses addHeaderColumnNameMapping to specify column headers using a map and writes bean data with StatefulBeanToCsv.

  3. "Java StatefulBeanToCsv write header and data separately"

    • Code:
      StatefulBeanToCsv<MyBean> csvWriter = new StatefulBeanToCsvBuilder<MyBean>(writer) .withQuotechar(CSVWriter.NO_QUOTE_CHARACTER) .withSeparator(',') .withLineEnd(CSVWriter.DEFAULT_LINE_END) .build(); csvWriter.writeHeader("Column Header 1", "Column Header 2"); csvWriter.write(myBeanList); csvWriter.close();
    • Description: Writes column headers and bean data separately using writeHeader with StatefulBeanToCsv.

  4. "Java StatefulBeanToCsv with custom header order"

    • Code:
      StatefulBeanToCsv<MyBean> csvWriter = new StatefulBeanToCsvBuilder<MyBean>(writer) .withQuotechar(CSVWriter.NO_QUOTE_CHARACTER) .withSeparator(',') .withLineEnd(CSVWriter.DEFAULT_LINE_END) .build(); csvWriter.writeHeader("Column Header 2", "Column Header 1"); csvWriter.write(myBeanList); csvWriter.close();
    • Description: Writes column headers in a custom order using writeHeader with specified header names.

  5. "Java StatefulBeanToCsv with dynamic header generation"

    • Code:
      StatefulBeanToCsv<MyBean> csvWriter = new StatefulBeanToCsvBuilder<MyBean>(writer) .withQuotechar(CSVWriter.NO_QUOTE_CHARACTER) .withSeparator(',') .withLineEnd(CSVWriter.DEFAULT_LINE_END) .build(); String[] headers = getDynamicHeaders(); // Implement a method to dynamically generate headers csvWriter.writeHeader(headers); csvWriter.write(myBeanList); csvWriter.close();
    • Description: Dynamically generates column headers and writes them with StatefulBeanToCsv.

  6. "Java StatefulBeanToCsv with CsvBindByName annotation"

    • Code:
      public class MyBean { @CsvBindByName(column = "Column Header 1") private String field1; @CsvBindByName(column = "Column Header 2") private String field2; // Getters and setters... } 
      StatefulBeanToCsv<MyBean> csvWriter = new StatefulBeanToCsvBuilder<MyBean>(writer) .withQuotechar(CSVWriter.NO_QUOTE_CHARACTER) .withSeparator(',') .withLineEnd(CSVWriter.DEFAULT_LINE_END) .build(); csvWriter.write(myBeanList); csvWriter.close();
    • Description: Uses CsvBindByName annotation in the bean class to specify column headers and writes data using StatefulBeanToCsv.

  7. "Java StatefulBeanToCsv with CsvBindByPosition annotation"

    • Code:
      public class MyBean { @CsvBindByPosition(position = 1) private String field1; @CsvBindByPosition(position = 2) private String field2; // Getters and setters... } 
      StatefulBeanToCsv<MyBean> csvWriter = new StatefulBeanToCsvBuilder<MyBean>(writer) .withQuotechar(CSVWriter.NO_QUOTE_CHARACTER) .withSeparator(',') .withLineEnd(CSVWriter.DEFAULT_LINE_END) .build(); csvWriter.write(myBeanList); csvWriter.close();
    • Description: Uses CsvBindByPosition annotation in the bean class to specify column positions and writes data using StatefulBeanToCsv.

  8. "Java StatefulBeanToCsv with CsvBindAndJoinByPosition annotation"

    • Code:
      public class MyBean { @CsvBindAndJoinByPosition(position = "1-2", elementType = String.class) private List<String> fields; // Getters and setters... } 
      StatefulBeanToCsv<MyBean> csvWriter = new StatefulBeanToCsvBuilder<MyBean>(writer) .withQuotechar(CSVWriter.NO_QUOTE_CHARACTER) .withSeparator(',') .withLineEnd(CSVWriter.DEFAULT_LINE_END) .build(); csvWriter.write(myBeanList); csvWriter.close();
    • Description: Uses CsvBindAndJoinByPosition annotation in the bean class to join multiple positions and writes data using StatefulBeanToCsv.

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