CsvParser.java import java.io.BufferedReader;import java.io.FileReader;import java.util.ArrayList;import java.util.List;import java.util.regex.Matcher;import java.util.regex.Pattern;public class CsvParser {// Saved input CSV file pathnamepr
import java.io.BufferedReader; import java.io.FileReader; import java.util.ArrayList; import java.util.List; import java.util.regex.Matcher; import java.util.regex.Pattern; public class CsvParser { // Saved input CSV file pathname private String inputCsvFile; // Space mark , ; : etc. private String spaceMark=","; private Object[] arr = null; /** * Constructor * @param inputCsvFile * @param spaceMark */ public CsvParser(String inputCsvFile,String spaceMark){ this.inputCsvFile=inputCsvFile; this.spaceMark=spaceMark; } /** * Constructor * @param inputCsvFile */ public CsvParser(String inputCsvFile){ this.inputCsvFile=inputCsvFile; this.spaceMark=","; } /** * Get parsed array from CSV file * @return */ public Object[] getParsedArray() { List> retval=new ArrayList
>(); try { String regExp = getRegExp(); BufferedReader in = new BufferedReader(new FileReader(this.inputCsvFile)); String strLine; String str = ""; while ((strLine = in.readLine()) != null) { Pattern pattern = Pattern.compile(regExp); Matcher matcher = pattern.matcher(strLine); List
listTemp = new ArrayList (); while (matcher.find()) { str = matcher.group(); str = str.trim(); if (str.endsWith(spaceMark)) { str = str.substring(0, str.length() - 1); str = str.trim(); } if (str.startsWith("\"") && str.endsWith("\"")) { str = str.substring(1, str.length() - 1); if (isExisted("\"\"", str)) { str = str.replaceAll("\"\"", "\""); } } if (!"".equals(str)) { listTemp.add(str); } } // Add to retval retval.add(listTemp); } in.close(); } catch (Exception e) { e.printStackTrace(); } arr = retval.toArray(); return arr; } public void printArr() { if (arr != null) { for(Object obj : arr) { List list = (List ) obj; StringBuffer sb = new StringBuffer(); for(String item : list) { sb.append(item + ","); } sb.setLength(sb.length() - 1); System.out.println("[" + sb + "]"); } } } /** * Regular Expression for CSV parse * @return */ private String getRegExp() { final String SPECIAL_CHAR_A = "[^\",\\n ]"; final String SPECIAL_CHAR_B = "[^\""+spaceMark+"\\n]"; StringBuffer strRegExps = new StringBuffer(); strRegExps.append("\"(("); strRegExps.append(SPECIAL_CHAR_A); strRegExps.append("*["+spaceMark+"\\n ])*("); strRegExps.append(SPECIAL_CHAR_A); strRegExps.append("*\"{2})*)*"); strRegExps.append(SPECIAL_CHAR_A); strRegExps.append("*\"[ ]*"+spaceMark+"[ ]*"); strRegExps.append("|"); strRegExps.append(SPECIAL_CHAR_B); strRegExps.append("*[ ]*"+spaceMark+"[ ]*"); strRegExps.append("|\"(("); strRegExps.append(SPECIAL_CHAR_A); strRegExps.append("*["+spaceMark+"\\n ])*("); strRegExps.append(SPECIAL_CHAR_A); strRegExps.append("*\"{2})*)*"); strRegExps.append(SPECIAL_CHAR_A); strRegExps.append("*\"[ ]*"); strRegExps.append("|"); strRegExps.append(SPECIAL_CHAR_B); strRegExps.append("*[ ]*"); return strRegExps.toString(); } /** * If argChar is exist in argStr * @param argChar * @param argStr * @return */ private boolean isExisted(String argChar, String argStr) { boolean blnReturnValue = false; if ((argStr.indexOf(argChar) >= 0) && (argStr.indexOf(argChar) <= argStr.length())) { blnReturnValue = true; } return blnReturnValue; } }