openCSV是一款簡單的用於解析CSV檔案的java類庫，它封裝了CSV格式檔案的讀寫操作，可將檔案與java物件進行自動對映，自定義分隔符，使用轉義符等。

在使用時有幾點需要注意下：

        1、       生成的csv檔案用EXCEL開啟時，總是產生亂碼，但是用NOTEPAD++開啟時，顯示正常。這是因為匯出的檔案是UTF-8不含BOM格式編碼的，為了要讓EXCEL正確的顯示，需要手動的給將要輸出的內容加上BOM標識。

        2、       可通過@ CsvBindByName和@ CsvBindByPosition來CSV檔案欄位與物件屬性進行對映。@ CsvBindByName是根據表頭的名稱來對映；@

        3、       在讀CSV檔案時需要注意BOM字元，因為在寫檔案時為了能在Excel裡開啟增加了UTF-8 BOM標識，讀檔案時第一列會讀不出來。這種情況的解決方法是使用apache commons io提供的BOMInputStream。

        程式碼示例如下

public class Person {

	private String name;

	private int age;

	private int sex;

	private String phone;

	private String address;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public int getSex() {
		return sex;
	}

	public void setSex(int sex) {
		this.sex = sex;
	}

	public String getPhone() {
		return phone;
	}

	public void setPhone(String phone) {
		this.phone = phone;
	}

	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

	public String toString() {
		return ":"+name + ";" + age + ";" + sex + ";" + phone + ";" + address;
	}
}
 

public class WriteCSV {

	public void writeCSV2(List<Person> dataList, String finalPath) {
		try {
			Writer writer = new FileWriter(finalPath);
			// 手動加上BOM標識
			writer.write(new String(new byte[] { (byte) 0xEF, (byte) 0xBB, (byte) 0xBF }));

			// 設定顯示的順序
			String[] columnMapping = { "name", "age", "sex", "phone", "address" };
			ColumnPositionMappingStrategy<Person> mapper = 
					new ColumnPositionMappingStrategy<Person>();
			mapper.setType(Person.class);
			mapper.setColumnMapping(columnMapping);

			// 寫表頭
			CSVWriter csvWriter = new CSVWriter(writer, CSVWriter.DEFAULT_SEPARATOR,
					CSVWriter.NO_QUOTE_CHARACTER);
			String[] header = { "姓名", "年齡", "性別", "手機", "住址" };
			csvWriter.writeNext(header);

			StatefulBeanToCsv beanToCsv = new StatefulBeanToCsvBuilder(writer)
					.withMappingStrategy(mapper)
					.withQuotechar(CSVWriter.NO_QUOTE_CHARACTER)
					.withSeparator(CSVWriter.DEFAULT_SEPARATOR)
					.withEscapechar('\\').build();
			beanToCsv.write(dataList);
			csvWriter.close();
			writer.close();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (CsvDataTypeMismatchException e) {
			e.printStackTrace();
		} catch (CsvRequiredFieldEmptyException e) {
			e.printStackTrace();
		}
		System.out.println(finalPath + "資料匯出成功");
	}

	public void readCSV2(String finalPath) {
		try {
			// 使用BOMInputStream自動去除UTF-8中的BOM
			Reader reader = new InputStreamReader(new BOMInputStream(
					new FileInputStream(finalPath)), "utf-8");
			CSVReader csvReader = new CSVReader(reader, CSVWriter.DEFAULT_SEPARATOR,
					CSVWriter.NO_QUOTE_CHARACTER);

			// 列名的對映
			HeaderColumnNameTranslateMappingStrategy<Person> strategy = 
					new HeaderColumnNameTranslateMappingStrategy<Person>();
			strategy.setType(Person.class);
			Map<String, String> columnMapping = new HashMap<String, String>();
			columnMapping.put("姓名", "name");
			columnMapping.put("年齡", "age");
			columnMapping.put("性別", "sex");
			columnMapping.put("手機", "phone");
			columnMapping.put("住址", "address");
			strategy.setColumnMapping(columnMapping);

			CsvToBean<Person> csvToBean = new CsvToBean<Person>();

			List<Person> list = csvToBean.parse(strategy, csvReader);

			for (Person p : list) {
				System.out.println(p.toString());
			}
			csvReader.close();
			reader.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public static void main(String[] args) {
		List<Person> dataList = new ArrayList<Person>();
		Person person1 = new Person();
		person1.setName("張三");
		person1.setSex(1);
		person1.setAge(55);
		person1.setPhone("13911111111");
		person1.setAddress("北京海淀區");
		dataList.add(person1);
		Person person2 = new Person();
		person2.setName("小美");
		person2.setSex(0);
		person2.setAge(20);
		person2.setPhone("13911112222");
		person2.setAddress("北京西城區");
		dataList.add(person2);
		Person person3 = new Person();
		person3.setName("小明");
		person3.setSex(1);
		person3.setAge(25);
		person3.setPhone("13933333333");
		person3.setAddress("北京海淀區");
		dataList.add(person3);

		WriteCSV writer = new WriteCSV();
		String finalPath2 = "D:/bbb.csv";
		writer.writeCSV2(dataList, finalPath2);
		writer.readCSV2(finalPath2);
	}
}