Java使用Apache Commons高效处理CSV文件的操作指南

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-csv</artifactId>
    <version>1.10.0</version>
</dependency>

package com.lm.csv.example;

import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVPrinter;

import java.io.FileWriter;
import java.io.IOException;

public class CsvWriterExample {
    public static void main(String[] args) throws IOException {
        // 创建 CSV 文件
        try (FileWriter writer = new FileWriter("e:\\csv\\output.csv");
             CSVPrinter printer = new CSVPrinter(writer, CSVFormat.DEFAULT
                     .withHeader("ID", "Name", "Age", "Email"))) {

            printer.printRecord("1", "Alice", "25", "alice@example.com");
            printer.printRecord("2", "Bob", "30", "bob@example.com");
            printer.printRecord("3", "Charlie", "35", "charlie@example.com");
        }
    }
}

package com.lm.csv.example;

import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVPrinter;

import java.io.FileWriter;

public class CustomDelimiterExample {
    public static void main(String[] args) throws Exception {
        try (FileWriter writer = new FileWriter("e:\\csv\\custom_delimiter.csv");
             CSVPrinter printer = new CSVPrinter(writer, CSVFormat.DEFAULT
                     .withHeader("ID", "Name", "Age", "Email")
                     .withDelimiter(':'))) {

            printer.printRecord("1", "Diana", "40", "diana@example.com");
            printer.printRecord("2", "Eve", "22", "eve@example.com");
        }
    }
}

package com.lm.csv.example;

import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVParser;

import java.io.StringReader;

public class SpecialCharacterExample {
    public static void main(String[] args) throws Exception {
        String csvData = "ID,Name,Notes\n" +
                "1,\"John\",\"Loves coding\nand teaching\"\n" +
                "2,\"Jane\",\"Enjoys reading\"";

        try (CSVParser parser = CSVFormat.DEFAULT
                .withFirstRecordAsHeader()
                .parse(new StringReader(csvData))) {

            parser.forEach(record -> {
                String id = record.get("ID");
                String name = record.get("Name");
                String notes = record.get("Notes");

                System.out.printf("ID: %s, Name: %s, Notes: %s%n", id, name, notes);
            });
        }
    }
}

package com.lm.csv.example;

import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVParser;
import org.apache.commons.csv.CSVRecord;

import java.io.FileReader;

public class EnumFieldExample {
    enum Header {
        ID, Name, Age, Email
    }

    public static void main(String[] args) throws Exception {
        try (FileReader reader = new FileReader("e:\\csv\\output.csv");
             CSVParser parser = CSVFormat.DEFAULT
                     .withFirstRecordAsHeader()
                     .parse(reader)) {

            for (CSVRecord record : parser) {
                String id = record.get(Header.ID);
                String name = record.get(Header.Name);
                String age = record.get(Header.Age);
                String email = record.get(Header.Email);

                System.out.printf("ID: %s, Name: %s, Age: %s, Email: %s%n", id, name, age, email);
            }
        }
    }
}