Importing CSV data with Apache POI

Question

How can I efficiently import CSV data with Apache POI? If I have a very large CSV file that I would like to store in my Excel spreadsheet, then I don't imagine that going cell-by-cell is the best way to import...?

Answer 1

We write the java code based on the file extension. Here we are dealing with .csv extension and here is the Apache POI code to handle it. We split the content and store in Array and then use it down the line.

CSVParser parser = new CSVParser(new FileReader("D:/your_file.csv"), CSVFormat.DEFAULT);
List<CSVRecord> list = parser.getRecords();
for (CSVRecord record : list) {
    String[] arr = new String[record.size()];
    int i = 0;
    for (String str : rec) {
        arr[i++] = str;
    }
}  
parser.close();    

Related Maven Dependency:

<dependency>
    <groupId>commons-collections</groupId>
    <artifactId>commons-collections</artifactId>
    <version>3.2.2</version>
</dependency>
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-csv</artifactId>
    <version>1.5</version>
</dependency>
<dependency>
    <groupId>com.opencsv</groupId>
    <artifactId>opencsv</artifactId>
    <version>4.2</version>
</dependency>