Java采用opencsv解析csv文件以及解析中文乱码问题

参考资料: opencsv文档
写下本文时最新版的opencsv版本为4.0, maven坐标如下:

    <dependency>
      <groupId>com.opencsv</groupId>
      <artifactId>opencsv</artifactId>
      <version>4.0</version>
    </dependency>

测试用test.csv

id,date,name
1,2017-10-11,amy
2,2017-10-12,啊

与csv文件对应的java bean

public class TestBean {
    // 通过属性名绑定csv列名, 属性名必须与csv列名相同
    @CsvBindByName
    private Integer id;

    // 解析Date格式
    @CsvBindByName
    @CsvDate("yyyy-MM-dd")
    private Date date;

    // csv列名与字段名不同时
    @CsvBindByName(column = "name")
    private String name;

    // csv不存在列名时也可通过位置绑定, 如 `@CsvBindByPosition(position = 0)   `

    // getter, setter and toString() ...
}

使用opencsv解析

public class CsvParser {
    public static void main(String[] args) throws IOException {
        String path = "test.csv";
        List<TestBean> beans = new CsvToBeanBuilder<TestBean>(new FileReader(path))
            .withType(TestBean.class).build().parse();
        System.out.println(beans);
    }
}

结果中中文显示乱码

[TestBean [id=1, date=Wed Oct 11 00:00:00 CST 2017, name=amy], 
TestBean [id=2, date=Thu Oct 12 00:00:00 CST 2017, name=��]]

由于FileReader无法指定字符编码, 此时应当使用InputStreamReader设置字符编码

public class CsvParser {
    public static void main(String[] args) throws IllegalStateException, IOException {
        String path = "test.csv";
        String charset = "utf-8";
        FileInputStream fileInputStream = new FileInputStream(path);
        Reader reader = new InputStreamReader(fileInputStream, charset);
        List<TestBean> beans = new CsvToBeanBuilder<TestBean>(reader)
            .withType(TestBean.class).build().parse();
        System.out.println(beans);
    }
}

从结果来看, 中文解析以及正常了

[TestBean [id=1, date=Wed Oct 11 00:00:00 CST 2017, name=amy], 
TestBean [id=2, date=Thu Oct 12 00:00:00 CST 2017, name=啊]]

实际上csv列名为中文时, 只要在bean中对应属性配置了@CsvBindByName(column = "中文列名")也是可以解析的