First time with Apache Commons CSV

1. New Java project csvexample in Eclipse.

2. Add a CSV file:
Create a new CSV file under the "\CSVEXAMPLE\SRC" directory, or copy the CSV file elsewhere to this directory.

The contents are as follows:

3. Download the source and extract the Apache Commons CSV:
https://commons.apache.org/proper/commons-csv/download_csv.cgi
Binaries or source, whichever is OK. I've got two of them.

4. Add the Org.apache.commons.csv package to the project (two ways):
First Type:
Copy the Org directory under the "\commons-csv-1.4-src\src\main\java" directory to the SRC directory of the Csvexample project and refresh the Csvexample project. You can see a org.apache.commons.csv package below the directory.

The second type:
Introduction of third party libraries
Open eclipse–> Item Right-click –> build path–> Add External archives–> Select Jar file

5. Create a new Csvdemo package, write code in this package, and practice using Apache. Read CSV

Package Csvdemo;

Import java.io.FileNotFoundException;
Import Java.io.FileReader;
Import java.io.IOException;
Import Java.io.Reader;

Import Org.apache.commons.csv.CSVFormat;
Import Org.apache.commons.csv.CSVRecord;

public class Csvreader {public

    static void Main (string[] args) {
        try {
            Reader in=new filereader ("c:\\users\\ TianLin liao\\workspace\\csvexample\\src\\foods.csv ");
            Iterable<csvrecord> Records=csvformat.excel.withheader (). Parse (in);
            for (Csvrecord record:records) {
                System.out.print (record.get ("Name") + "");
                System.out.print (Record.get ("Favorite Color") + "");
                System.out.println (Record.get ("Favorite Food"));
            }
        catch (FileNotFoundException e) {
            e.printstacktrace ();
        } catch (IOException e) {
            e.printstacktrace (); c20/>}}}

if there is no header:

public class Csvreader {public

    static void Main (string[] args) {
        try {
            Reader in=new filereader ("c:\\users\\ TianLin liao\\workspace\\csvexample\\src\\foods.csv ");
            Iterable<csvrecord> Records=csvformat.excel.parse (in);
            for (Csvrecord record:records) {
                System.out.print (record.get (0) + "");
                System.out.print (Record.get (1) + "");
                System.out.println (Record.get (2));
            }
        catch (FileNotFoundException e) {
            e.printstacktrace ();
        } catch (IOException e) {
            e.printstacktrace (); c13/>}}}

Write CSV:

Package Csvdemo;
Import Java.io.FileWriter;
Import java.util.ArrayList;

Import java.util.List;
Import Org.apache.commons.csv.CSVFormat;

Import Org.apache.commons.csv.CSVPrinter; public class Csvwriter {public static void main (string[] args) {final string[] file_header={"ID", "Name", "Sc
        Ore "};

        Final String file_name= "Student.csv";
        Create student Objects Student student1=new Student ("7601", "Abby", 113);
        Student student2=new Student ("7301", "Sam", 121);
        Student student3=new Student ("7101", "Yuuki", 130);
        Student student4=new Student ("7302", "Jay", 100);
        Student student5=new Student ("7500", "Zoe", 98);
        Add to a List list<student> students = new arraylist<> ();
        Students.add (STUDENT1);
        Students.add (Student2);
        Students.add (STUDENT3);
        Students.add (STUDENT4);

        Students.add (STUDENT5);
        FileWriter Filewriter=null;
        Csvprinter Csvprinter=null; CsvformAt Csvformat=csvformat.default.withheader (File_header);
            try {filewriter=new fileWriter (file_name);

            Csvprinter=new Csvprinter (FileWriter, Csvformat);
                for (Student student:students) {list<string> record=new arraylist<> ();
                Record.add (Student.getid ());
                Record.add (Student.getname ());
                Record.add (String.valueof (Student.getscore ()));
            Csvprinter.printrecord (record);
        } catch (Exception e) {e.printstacktrace ();
                }finally {try{filewriter.flush ();
                Filewriter.close ();
            Csvprinter.close ();
            }catch (Exception e) {e.printstacktrace ();
    Class student{private String ID;
    private String name;

    private int score;
        Public Student (string ID, string name, int score) {super (); This.id = ID;
        THIS.name = name;
    This.score = score;
    Public String GetId () {return id;
    public void SetId (String id) {this.id = ID;
    Public String GetName () {return name;
    public void SetName (String name) {this.name = name;
    public int Getscore () {return score;
    The public void SetScore (int score) {This.score = score; }

}

After writing, the effect is as follows:

In the code to read CSV, change the file path to "Student.csv" to read the just-written CSV.

Reader in=new FileReader ("Student.csv");

reference materials
https://examples.javacodegeeks.com/core-java/apache/commons/csv-commons/ writeread-csv-files-with-apache-commons-csv-example/