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; /** * CsvParser * 此类参考了网上方案,在此表示感谢 * 2013-12-10 21:43:48 */ public class CsvParser{ // Saved input CSV file pathname private String inputCsvFile; // Space mark , ; : etc. private String spaceMark=","; /** * Contructor * @param inputCsvFile */ public CsvParser(String inputCsvFile,String spaceMark){ this.inputCsvFile=inputCsvFile; this.spaceMark=spaceMark; } /** * Contructor * @param inputCsvFile */ public CsvParser(String inputCsvFile){ this.inputCsvFile=inputCsvFile; this.spaceMark=","; } /** * Get parsed array from CSV file * @return */ public Object[] getParsedArray() throws Exception{ List<List<String>> retval=new ArrayList<List<String>>(); 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<String> listTemp = new ArrayList<String>(); 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 (CsvParser.isExisted("""", str)) { str = str.replaceAll("""", """); } } if (!"".equals(str)) { listTemp.add(str); } } // Add to retval retval.add(listTemp); } in.close(); return retval.toArray(); } /** * 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 static boolean isExisted(String argChar, String argStr) { boolean blnReturnValue = false; if ((argStr.indexOf(argChar) >= 0) && (argStr.indexOf(argChar) <= argStr.length())) { blnReturnValue = true; } return blnReturnValue; } /** * Test * @param args * @throws Exception */ public static void main(String[] args) throws Exception{ CsvParser parser=new CsvParser("C:\Users\IBM_ADMIN\Desktop\Test CSV Files\dummydata_not quoted_1.csv"); //CsvParser parser=new CsvParser("C:\Users\IBM_ADMIN\Desktop\Test CSV Files\dummydata_not quoted_2.csv"); //CsvParser parser=new CsvParser("C:\Users\IBM_ADMIN\Desktop\Test CSV Files\dummydata_quoted.csv"); //CsvParser parser=new CsvParser("C:\Users\IBM_ADMIN\Desktop\Test CSV Files\dummydata_quoted_2.csv"); //CsvParser parser=new CsvParser("C:\Users\IBM_ADMIN\Desktop\Test CSV Files\dummydata_1.csv",";"); //CsvParser parser=new CsvParser("C:\Users\IBM_ADMIN\Desktop\Test CSV Files\dummydata_2.csv",":"); Object[] arr=parser.getParsedArray(); //System.out.println(arr); for(Object obj:arr){ System.out.print("["); List<String> ls=(List<String>)obj; for(String item:ls){ System.out.println(item+","); } System.out.println("],"); } } }
解析CSV文件:
Column1,Column2,Column3,Column4,Column5
Roderick Manuel,2013-02-21,59 E Brillhart Ave,67526,branch damage other impulse
Lashonda Frank,2012-11-21,418 US Hwy 100,22609,fowl house
Holly Silva,2013-09-15,16345 Old Jacksboro Hwy,13140,art sand colour tray boiling
Martin Forbes,2013-04-28,69 Spr 33,91656,bag point necessary country
Josefa Berry,2008-08-21,125 Hwy' 84 E,12604,Sort industry married safe shirt
Allyson Green,2004-11-11,425 Ranch Rd 587,35059,mother political
Tim Hopkins,2005-03-17,9559 I- 820,83598,crush. surprise station' distance from
Olen Abbott,2009-02-17,2249 Westwood Dr N,15575,acid
Ana Fowler,2011-02-19,22 State Loop 426,13409,memory poor farm adjustment
Minerva House,2009-02-18,57151 Collett Rd,45782,dry summer
将解析完得到的数组输出如下:
[Column1,
Column2,
Column3,
Column4,
Column5,
],
[Roderick Manuel,
2013-02-21,
59 E Brillhart Ave,
67526,
branch damage other impulse,
],
[Lashonda Frank,
2012-11-21,
418 US Hwy 100,
22609,
fowl house,
],
[Holly Silva,
2013-09-15,
16345 Old Jacksboro Hwy,
13140,
art sand colour tray boiling,
],
[Martin Forbes,
2013-04-28,
69 Spr 33,
91656,
bag point necessary country,
],
[Josefa Berry,
2008-08-21,
125 Hwy' 84 E,
12604,
Sort industry married safe shirt,
],
[Allyson Green,
2004-11-11,
425 Ranch Rd 587,
35059,
mother political,
],
[Tim Hopkins,
2005-03-17,
9559 I- 820,
83598,
crush. surprise station' distance from,
],
[Olen Abbott,
2009-02-17,
2249 Westwood Dr N,
15575,
acid,
],
[Ana Fowler,
2011-02-19,
22 State Loop 426,
13409,
memory poor farm adjustment,
],
[Minerva House,
2009-02-18,
57151 Collett Rd,
45782,
dry summer,
],