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public static void main(String args[]) {  File file = null;  BufferedReader br = null;  StringBuffer buffer = null;  String childPath = "src/endlist.txt";  String data = "";  try {   file = new File(childPath);   buffer = new StringBuffer();   InputStreamReader isr = new InputStreamReader(new FileInputStream(file), "utf-8");   br = new BufferedReader(isr);   int s;   while ((s = br.read()) != -1) {    buffer.append((char) s);   }   data = buffer.toString();  } catch (Exception e) {   e.printStackTrace();  }  Map<String, ArrayList<String>> resultMap = new HashMap<String, ArrayList<String>>();  for (int i = 0; i < 10; i++) {   resultMap.put("13" + i, new ArrayList<String>());  }  Pattern pattern = Pattern.compile("(//d{3})(//d{4},[/u4e00-/u9fa5]*//n)");  Matcher matcher = pattern.matcher(data);   while (matcher.find()) {   resultMap.get(matcher.group(1)).add(matcher.group(2));  }  for (int i = 0; i < 10; i++) {   if (resultMap.get("13" + i).size() > 0) {    try {     File outFile = new File("src/13" + i + ".txt");     FileOutputStream outputStream = new FileOutputStream(outFile);     OutputStreamWriter writer = new OutputStreamWriter(outputStream, "utf-8");     ArrayList<String> tempList = resultMap.get("13" + i);     for (int j = 0; j < tempList.size(); j++) {      writer.append(resultMap.get("13" + i).get(j));     }     writer.close();     outputStream.close();    } catch (Exception e) {     // TODO Auto-generated catch block     e.printStackTrace();    }   }  } }