Category Archives: 程式語言

public static final String UTF8_BOM = “\uFEFF”; public ByteArrayInputStream createFile(Object object) { try { CSV csv = (CSV) object; StringBuffer sb = new StringBuffer(); sb.append(UTF8_BOM); if (csv.getHeaderList() != null) { sb.append(StringUtils.join(csv.getHeaderList().toArray(new String[0]), “,”)).append(“\n”); } for (List<String> row : csv.getDataList()) { … Continue reading →

Source: CSDN: InputStream类available和read方法可能读取不到完整的流数据 stackoverflow: How to read a http file inmemory without saving on local drive? private static InputStream download(String sourceURL) throws Exception { InputStream inputStream = new URL(sourceURL).openStream(); ByteArrayOutputStream output = new ByteArrayOutputStream(); byte[] buffer = new byte[4096]; int … Continue reading →

Reference public static void main(String[] args) throws Exception { String number = “1000500000”; double amount = Double.parseDouble(number); DecimalFormat intFormatter = new DecimalFormat(“#,###”); DecimalFormat floatFormatter = new DecimalFormat(“#,###.00”); System.out.println(“==int==”); System.out.println(intFormatter.format(amount)); System.out.println(String.format(“%,d”, Integer.parseInt((number)))); System.out.println(number.replaceAll(“(\\d)(?=(\\d{3})+$)”, “$1,”)); System.out.println(“==float==”); System.out.println(floatFormatter.format(amount)); System.out.println(String.format(“%,.2f”, Float.parseFloat((number)))); } ==int== 1,000,500,000 … Continue reading →

Reference: [stackoverflow] Mask some part of String return String.replaceAll(“\\b(\\d{3})\\d+(\\d{3})”, “$1****$2”); # 1234567890 => 123****890