Java读写CSV之SuperCSV

Super CSV是一个速度奇快、免费跨平台的 CSV 格式数据的读写库，可以方便的处理对象、Map、列表的读写操作，以及自动化的类型转换和数据检查功能。

http://supercsv.sourceforge.net/

版本：SuperCSV-1.52.jar

1、读CSV（CsvBeanReader/CsvListReader/CsvMapReader）

InputStreamReader freader = new InputStreamReader(new FileInputStream(
		new File("csv/test1.csv")), "GB2312");

ICsvBeanReader reader = new CsvBeanReader(freader,
		CsvPreference.EXCEL_PREFERENCE);

//获取头部信息
String[] headers = reader.getCSVHeader(true);

//获取数据部分
UserBean bean = null;
while ((bean = reader.read(UserBean.class, headers, UserBean.readProcessors)) != null) {
	System.out.print(bean.getName() + "\t");
	System.out.print(bean.getAge() + "\t");
	System.out.print(bean.getBirthday() + "\t");
	System.out.println(bean.getAddress());
}

2、写CSV（CsvBeanWriter/CsvListWriter/CsvMapWriter）

OutputStreamWriter fwriter = new OutputStreamWriter(
		new FileOutputStream(new File("csv/test2.csv")), "GB2312");

SimpleDateFormat format = new SimpleDateFormat("yyyy/M/d");

ICsvBeanWriter writer = new CsvBeanWriter(fwriter,
		CsvPreference.EXCEL_PREFERENCE);

//做3条数据
UserBean bean1 = new UserBean();
bean1.setName("赵,四");		//特殊字符：逗号
bean1.setAge(26);
bean1.setBirthday(format.parse("1984/10/30"));
bean1.setAddress("辽宁");

UserBean bean2 = new UserBean();
bean2.setName("刘\n能");		//特殊字符：换行
bean2.setAge(24);
bean2.setBirthday(format.parse("1986/5/13"));
bean2.setAddress("吉林");

UserBean bean3 = new UserBean();
bean3.setName("谢\"广坤");	//特殊字符：双引号
bean3.setAge(22);
bean3.setBirthday(format.parse("1988/10/8"));
bean3.setAddress("黑龙江");

//输出头部
String headers[] = { "name", "age", "birthday", "address" };		
writer.writeHeader(headers);

//按顺序输出数据
writer.write(bean1, headers, UserBean.writeProcessors);
writer.write(bean2, headers, UserBean.writeProcessors);
writer.write(bean3, headers, UserBean.writeProcessors);

writer.close();

3、自定义CellProcessor

InputStreamReader freader = new InputStreamReader(new FileInputStream(
		new File("csv/test5.csv")), "GB2312");

ICsvBeanReader reader = new CsvBeanReader(freader,
		CsvPreference.EXCEL_PREFERENCE);

//获取头部信息
String[] headers = reader.getCSVHeader(true);

CellProcessor[] readProcessors = new CellProcessor[] {
		new StrMinMax(2, 10),
		new ParseInt(),
		new ParseDate("yyyy/M/d"),
		new CellProcessorAdaptor() {
			@Override
			public Object execute(final Object value, final CSVContext context) {
				String v = (String) value;
				if (v.length() > 5) {
					v = v.substring(0,5) + "......";
				}
		        return next.execute(v, context);
			}
		}};

//获取数据部分
UserBean bean = null;
while ((bean = reader.read(UserBean.class, headers, readProcessors)) != null) {
	System.out.print(bean.getName() + "\t");
	System.out.print(bean.getAge() + "\t");
	System.out.print(bean.getBirthday() + "\t");
	System.out.println(bean.getAddress());
}
System.out.println();

reader.close();

其他的CSV解析器还有：
Commons CSV：http://commons.apache.org/proper/commons-csv/
OpenCSV：http://opencsv.sourceforge.net/
OrangeSignal CSV：http://orangesignal.github.io/orangesignal-csv/

CSV Library Features Matrix
http://orangesignal.github.io/orangesignal-csv/csv_library_feature_matrix.html
https://github.com/uniVocity/csv-parsers-comparison