Java读写CSV之SuperCSV

http://rensanning.iteye.com/blog/1552053

Super CSV是一个速度奇快、免费跨平台的 CVS 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。

[url]http://supercsv.sourceforge.net/ [/url]

版本：SuperCSV-1.52.jar

1、读CSV 

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 

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();