Example usage for com.fasterxml.jackson.dataformat.csv CsvMapper writer

Introduction

In this page you can find the example usage for com.fasterxml.jackson.dataformat.csv CsvMapper writer.

Prototype

public ObjectWriter writer() 

Source Link

Document

Convenience method for constructing ObjectWriter with default settings.

Usage

From source file:hrytsenko.gscripts.io.CsvFiles.java

/**
 * Save records into file./*  w ww.j  a  v a  2  s.  c om*/
 * 
 * <p>
 * If file already exists, then it will be overridden.
 * 
 * @param records
 *            the list of records to save.
 * @param args
 *            the named arguments.
 * 
 * @throws IOException
 *             if file could not be saved.
 */
public static void saveCsv(List<Map<String, ?>> records, Map<String, ?> args) {
    if (records.isEmpty()) {
        LOGGER.info("No records to save.");
        return;
    }

    Path path = NamedArgs.findPath(args);
    LOGGER.info("Save {}.", path.getFileName());

    CsvSchema.Builder csvSchema = schemaFrom(args).setUseHeader(true);
    Records.columns(records).forEach(csvSchema::addColumn);

    try (Writer writer = Files.newBufferedWriter(path, charsetFrom(args))) {
        CsvMapper csvMapper = new CsvMapper();
        csvMapper.configure(CsvGenerator.Feature.ALWAYS_QUOTE_STRINGS, true);

        csvMapper.writer().with(csvSchema.build()).writeValue(writer, Records.normalize(records));
    } catch (IOException exception) {
        throw new AppException(String.format("Could not save file %s.", path.getFileName()), exception);
    }
}

---

From source file:hrytsenko.csv.IO.java

/**
 * Saves records into CSV file.//from  w  ww .j a va 2 s  .  c om
 * 
 * <p>
 * If file already exists, then it will be overridden.
 * 
 * @param args
 *            the named arguments {@link IO}.
 * 
 * @throws IOException
 *             if file could not be written.
 */
public static void save(Map<String, ?> args) throws IOException {
    Path path = getPath(args);
    LOGGER.info("Save: {}.", path.getFileName());

    @SuppressWarnings("unchecked")
    Collection<Record> records = (Collection<Record>) args.get("records");
    if (records.isEmpty()) {
        LOGGER.info("No records to save.");
        return;
    }

    try (Writer dataWriter = newBufferedWriter(path, getCharset(args), StandardOpenOption.CREATE,
            StandardOpenOption.TRUNCATE_EXISTING)) {
        Set<String> columns = new LinkedHashSet<>();
        List<Map<String, String>> rows = new ArrayList<>();
        for (Record record : records) {
            Map<String, String> values = record.values();
            columns.addAll(values.keySet());
            rows.add(values);
        }

        CsvSchema.Builder csvSchema = getSchema(args).setUseHeader(true);
        for (String column : columns) {
            csvSchema.addColumn(column);
        }
        CsvMapper csvMapper = new CsvMapper();
        ObjectWriter csvWriter = csvMapper.writer().withSchema(csvSchema.build());
        csvWriter.writeValue(dataWriter, rows);
    }
}

---

From source file:ro.fortsoft.dada.csv.CsvGenericDao.java

public long writeToCsv() {
    Class<T> persistentClass = getPersistentClass();

    // create mapper and schema
    CsvMapper mapper = new CsvMapper();
    CsvSchema schema = mapper.schemaFor(persistentClass).withHeader();

    // write entities
    long count = 0;
    try {/* w ww .  ja v  a  2  s.  com*/
        mapper.writer().with(schema).writeValue(new File(csvFile), entities);
        count = entities.size();
    } catch (IOException e) {
        e.printStackTrace();
    }

    return count;
}

---