在线程“main”中获取exceptionjava.lang.OutOfMemoryError：Java堆空间
如果我把超过5个Excel文件在一个文件夹我得到这个
java.lang.OutOfMemoryError: Java heap space. 完全我有40个Excel文件，每个文件可能包含5到10张。 我的代码将找出excel文件中的错误并将其写入Error.txt文件中。
public class Hvd { public static int getExcelColumnNumber(String column) { int result = 0; for (int i = 0; i < column.length(); i++) { result *= 26; result += column.charAt(i) - 'A' + 1; } return result; } public static String getExcelColumnName(int number) { final StringBuilder sb = new StringBuilder(); int num = number - 1; while (num >= 0) { int numChar = (num % 26) + 65; sb.append((char)numChar); num = (num / 26) - 1; } return sb.reverse().toString(); } public static void main(String[] args) { try { //File directory = new File("C://Users//zkuwscr//Documents//new practice tests//Regression_Dev_Dec12th"); File directory = new File("C://Users//kondeti.venkatarao//Documents//Regresion_sheets"); File[] files = directory.listFiles(); //File errorBW = new File("C://Users//zkuwscr//Documents//new practice tests//Regression_Dev_Dec12th//ErrorBW.txt"); File errors = new File("C://Users//kondeti.venkatarao//Documents//Regresion_sheets//Error.txt"); FileOutputStream errorsFileOutputStream = new FileOutputStream(errors); BufferedWriter errorsBufferedWriter = new BufferedWriter(new OutputStreamWriter(errorsFileOutputStream)); File mismatch = new File("C://Users//kondeti.venkatarao//Documents//Regresion_sheets//Mismatch.txt"); FileOutputStream mismatchFileOutputStream = new FileOutputStream(mismatch); BufferedWriter mismatchBufferedWriter = new BufferedWriter(new OutputStreamWriter(mismatchFileOutputStream)); for (File file : files) { if (file.getName().endsWith(".xlsx")) { //FileInputStream fis = new FileInputStream(file); // Create Workbook instance holding reference to .xlsx file OPCPackage pkg = OPCPackage.open(file); XSSFWorkbook workbook = new XSSFWorkbook(pkg); int i = 1; while (i < workbook.getNumberOfSheets()) { // System.out.println(workbook.getNumberOfSheets()); // Get first/desired sheet from the workbook XSSFSheet sheet = workbook.getSheetAt(i); // Iterate through each rows one by one Iterator<Row> rowIterator = sheet.iterator(); while (rowIterator.hasNext()) { Row row = rowIterator.next(); // For each row, iterate through all the columns Iterator<Cell> cellIterator = row.cellIterator(); while (cellIterator.hasNext()) { Cell cell = cellIterator.next(); // Check the cell type and format accordingly switch (cell.getCellType()) { /* * case Cell.CELL_TYPE_NUMERIC: * System.out.print(cell.getNumericCellValue()); * break; case Cell.CELL_TYPE_STRING: * System.out.print(cell.getStringCellValue()); * break; */ // case Cell.CELL_TYPE_FORMULA: case Cell.CELL_TYPE_FORMULA: if (cell.getCellFormula().startsWith("IF(")) if (sheet.getRow(row.getRowNum()) .getCell(cell.getColumnIndex()) .getRawValue().equals("1")) { HashSet<Integer> number= new HashSet<Integer>(); ArrayList<String> alphas=new ArrayList<String>(); String formula=sheet.getRow(row.getRowNum()).getCell(cell.getColumnIndex()).toString(); Matcher digitMatcher = Pattern.compile("\\d+").matcher(formula); Matcher alphabetMatcher = Pattern.compile("[a-zA-Z]+").matcher(formula); while(alphabetMatcher.find()) { if(!alphabetMatcher.group().equals("TYPE")) alphas.add(alphabetMatcher.group()); } int countIF = Collections.frequency(alphas, "IF"); int countABS = Collections.frequency(alphas, "ABS"); HashSet<String> alphaSet=new HashSet<String>(alphas); if(countIF!=5 && countIF!=6) alphaSet.remove("IF"); if(countABS != 3 && countABS!=4) alphaSet.remove("ABS"); while(digitMatcher.find()) { if(!digitMatcher.group().equals("0") && !digitMatcher.group().equals("1") && !digitMatcher.group().equals("01")) number.add(Integer.parseInt(digitMatcher.group())); } ArrayList<Integer> numberList = new ArrayList<Integer>(number); ArrayList<String> alphaList = new ArrayList<String>(alphaSet); System.out.println("alphaSet"+alphaSet); System.out.println("numberList"+numberList); int rowIndex=numberList.get(0)-1; int originalColumnIndex = getExcelColumnNumber(alphaList.get(0))-1; int referenceColumnIndex = getExcelColumnNumber(alphaList.get(1))-1; if(originalColumnIndex > referenceColumnIndex){ int temp = referenceColumnIndex; referenceColumnIndex =originalColumnIndex; originalColumnIndex=temp; } //System.out.println(sheet.getRow(row.getRowNum())); System.out.println("File Name: "+ file.getName()); System.out.println("Sheet Name: "+ sheet.getSheetName()); System.out.println(sheet.getRow(row.getRowNum()).getCell(cell.getColumnIndex()).toString()); if(sheet.getRow(rowIndex).getCell(originalColumnIndex).getCellFormula().equals("")) System.out.println("please help me out"); System.out.println("Function Name: "+ sheet.getRow(rowIndex).getCell(originalColumnIndex).getCellFormula()); System.out.println("row indext"+rowIndex); System.out.println("original column index"+originalColumnIndex); System.out.println("ref column index"+referenceColumnIndex); /*System.out.println("File Name: " + file.getName()); System.out.println("Sheet Name: " + sheet.getSheetName()); System.out.println(cell .getCellFormula());*/ if(sheet.getRow(rowIndex).getCell(originalColumnIndex).getCellFormula().contains("qCRA_") && sheet.getRow(rowIndex).getCell(originalColumnIndex).getRawValue().contains("Error:")){ errorsBufferedWriter.newLine(); errorsBufferedWriter.write("File Name: "+ file.getName()); errorsBufferedWriter.newLine(); errorsBufferedWriter.write("Sheet Name: "+ sheet.getSheetName()); errorsBufferedWriter.newLine(); errorsBufferedWriter.write("Function Name: "+ sheet.getRow(rowIndex).getCell(originalColumnIndex).getCellFormula()); errorsBufferedWriter.newLine(); errorsBufferedWriter.write("Cell Number: "+getExcelColumnName(originalColumnIndex+1)+numberList.get(0)); errorsBufferedWriter.newLine(); errorsBufferedWriter.write("Orginal Value : "+sheet.getRow(rowIndex).getCell(originalColumnIndex).getRawValue()); errorsBufferedWriter.newLine(); errorsBufferedWriter.write("Reference Value : "+sheet.getRow(rowIndex).getCell(referenceColumnIndex)); errorsBufferedWriter.newLine(); } else { mismatchBufferedWriter.newLine(); mismatchBufferedWriter.write("File Name: "+ file.getName()); mismatchBufferedWriter.newLine(); mismatchBufferedWriter.write("Sheet Name: "+ sheet.getSheetName()); mismatchBufferedWriter.newLine(); mismatchBufferedWriter.write("Function Name: "+ sheet.getRow(rowIndex).getCell(originalColumnIndex).getCellFormula()); mismatchBufferedWriter.newLine(); mismatchBufferedWriter.write("Cell Number: "+getExcelColumnName(originalColumnIndex+1)+numberList.get(0)); mismatchBufferedWriter.newLine(); mismatchBufferedWriter.write("Orginal Value : "+sheet.getRow(rowIndex).getCell(originalColumnIndex).getRawValue()); mismatchBufferedWriter.newLine(); mismatchBufferedWriter.write("Reference Value : "+sheet.getRow(rowIndex).getCell(referenceColumnIndex)); mismatchBufferedWriter.newLine(); } } break; } cell=null; } row=null; } i++; //fis.close(); pkg.close(); sheet=null; } workbook=null; } } errorsBufferedWriter.close(); errorsFileOutputStream.close(); } catch (Exception e) { e.printStackTrace(); } } }
- 如果你得到OOM，使用-Xmx …来增加堆的大小。
- 抛出你的StringBuffers并直接写入文件（
BufferedWriter甚至PrintStream）。 不需要将所有的输出保存在内存中。 只有这一点可以解决你的问题。