apache commons csv写文件demo

1.简介

csv处理开源的工具有不少，比如：super csv 和 Apache commons csv，本文使用Apache Commons csv，其提供了非常简单的接口来读写csv文件。

本文是针对csv文件的写示例。

2.依赖

 <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-csv</artifactId>
      <version>1.1</version>
    </dependency>

3.pojo对象

将需要保存的数据映射到对象中，然后将该对象信息写入csv 文件中。

package test.csv;

import java.math.BigDecimal;

/**
 * 城市房价模型
 *
 * Created by qunzer on 2015/3/3.
 */
public class CityPrice {
    private Integer id;
    private String city;
    private BigDecimal price;

    public CityPrice(Integer id, String city, BigDecimal price) {
        this.id = id;
        this.city = city;
        this.price = price;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public BigDecimal getPrice() {
        return price;
    }

    public void setPrice(BigDecimal price) {
        this.price = price;
    }
}

4.csv写入代码示例

package test.csv;

import com.google.common.collect.Lists;
import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVPrinter;

import java.io.FileWriter;
import java.io.IOException;
import java.math.BigDecimal;
import java.util.List;

/**
 * Created by qunzer on 2015/3/3.
 */
public class CsvFileWriter {
    private static final String LINE_SEPARATOR = "\n";
    private static final String[] File_HEAND = {"编号", "城市", "房价"};

    /**
     * 初始化数据，比如从数据库取值等
     *
     * @return
     */
    private static List<CityPrice> preCityPriceData() {
        List<CityPrice> cityPriceList = Lists.newArrayList();
        CityPrice cityPrice = new CityPrice(1, "beijing", BigDecimal.valueOf(350000));
        cityPriceList.add(cityPrice);
        return cityPriceList;
    }

    /**
     * 写入csv文件
     *
     * @param fileName 传入文件的路径，包含文件名
     */
    private static void csvWriter(String fileName) {
        FileWriter fileWriter;
        CSVPrinter csvPrinter = null;
        CSVFormat csvFormat = CSVFormat.DEFAULT.withRecordSeparator(LINE_SEPARATOR);
        try {
            fileWriter = new FileWriter(fileName);
            csvPrinter = new CSVPrinter(fileWriter, csvFormat);
            csvPrinter.printRecord(File_HEAND);
            for (CityPrice cityPrice : preCityPriceData()) {
                List<String> cityPriceRecord = Lists.newArrayList();
                cityPriceRecord.add(String.valueOf(cityPrice.getId()));
                cityPriceRecord.add(cityPrice.getCity());
                cityPriceRecord.add(String.valueOf(cityPrice.getPrice()));
                csvPrinter.printRecord(cityPriceRecord);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (csvPrinter != null) {
                    csvPrinter.flush();
                    csvPrinter.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}