当我试图将我的xlsx文件转换为csv文件时;“线程中的异常”;“主要”;java.lang.OutOfMemoryError:java堆空间;
这是密码当我试图将我的xlsx文件转换为csv文件时;“线程中的异常”;“主要”;java.lang.OutOfMemoryError:java堆空间;,java,Java,这是密码 package com.simplecode.excel; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.util.Iterator; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.Row; import org.ap
package com.simplecode.excel;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Iterator;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class XlstoCSV {
static void xlsx(File inputFile, File outputFile) {
// For storing data into CSV files
StringBuffer data = new StringBuffer();
try {
FileOutputStream fos = new FileOutputStream(outputFile);
// Get the workbook object for XLSX file
XSSFWorkbook wBook = new XSSFWorkbook(new FileInputStream(inputFile));
// Get first sheet from the workbook
XSSFSheet sheet = wBook.getSheetAt(0);
Row row;
Cell cell;
// Iterate through each rows from first sheet
Iterator<Row> rowIterator = sheet.iterator();
while (rowIterator.hasNext()) {
row = rowIterator.next();
// For each row, iterate through each columns
Iterator<Cell> cellIterator = row.cellIterator();
data.append("\r\n");
while (cellIterator.hasNext()) {
cell = cellIterator.next();
switch (cell.getCellType()) {
case Cell.CELL_TYPE_BOOLEAN:
data.append(cell.getBooleanCellValue() + ",");
break;
case Cell.CELL_TYPE_NUMERIC:
data.append(cell.getNumericCellValue() + ",");
break;
case Cell.CELL_TYPE_STRING:
data.append(cell.getStringCellValue() + ",");
break;
case Cell.CELL_TYPE_BLANK:
data.append("\r\n" + ",");
break;
default:
data.append(cell + ",");
}
}
}
fos.write(data.toString().getBytes());
fos.close();
} catch (Exception ioe) {
ioe.printStackTrace();
}
}
//testing the application
public static void main(String[] args) {
//reading file from desktop
File inputFile = new File("C:/Users/1479420/Desktop/Book1.xlsx");
//writing excel data to csv
File outputFile = new File("C:/Users/1479420/Desktop/Book.csv");
xlsx(inputFile, outputFile);
}
}
package com.simplecode.excel;
导入java.io.File;
导入java.io.FileInputStream;
导入java.io.FileOutputStream;
导入java.util.Iterator;
导入org.apache.poi.ss.usermodel.Cell;
导入org.apache.poi.ss.usermodel.Row;
导入org.apache.poi.xssf.usermodel.xssfheet;
导入org.apache.poi.xssf.usermodel.xssf工作簿;
公共类XlstoCSV{
静态void xlsx(文件输入文件、文件输出文件){
//用于将数据存储到CSV文件中
StringBuffer数据=新的StringBuffer();
试一试{
FileOutputStream fos=新的FileOutputStream(outputFile);
//获取XLSX文件的工作簿对象
XSSF工作簿wBook=新XSSF工作簿(新文件InputStream(inputFile));
//从工作簿中获取第一张工作表
XSSFSheet sheet=wBook.getSheetAt(0);
行行;
细胞;
//从第一张图纸开始遍历每行
迭代器rowIterator=sheet.Iterator();
while(roweiterator.hasNext()){
行=行迭代器。下一步();
//对于每一行,遍历每一列
迭代器cellIterator=row.cellIterator();
data.append(“\r\n”);
while(cellIterator.hasNext()){
cell=cellIterator.next();
开关(cell.getCellType()){
case Cell.Cell\u类型\u布尔值:
data.append(cell.getBooleanCellValue()+“,”);
打破
case Cell.Cell\u类型\u数值:
data.append(cell.getNumericCellValue()+“,”);
打破
case Cell.Cell\u类型\u字符串:
data.append(cell.getStringCellValue()+“,”);
打破
case Cell.Cell\u类型\u空白:
data.append(“\r\n”+“,”);
打破
违约:
数据。追加(单元格+“,”);
}
}
}
fos.write(data.toString().getBytes());
fos.close();
}捕获(异常ioe){
ioe.printStackTrace();
}
}
//测试应用程序
公共静态void main(字符串[]args){
//从桌面读取文件
File inputFile=新文件(“C:/Users/1479420/Desktop/Book1.xlsx”);
//将excel数据写入csv
File outputFile=新文件(“C:/Users/1479420/Desktop/Book.csv”);
xlsx(输入文件,输出文件);
}
}
使用BufferedWriter而不是FileOutputStream,直接将数据写入BufferedWriter,不要使用StringBuffer而不是数据。append
打印内容并查看是否结束,如果结束,则表示数据太大,无法使用StringBuffer
(您可以尝试StringBuilder
,顺便说一句,这是更推荐的)。如果它没有结束-您将从打印中看到它被卡住的地方。如果我将删除数据。追加它将打印在同一行中因此您得到了答案,您失败了,因为您使用的是StringBuffer
@alfasin,因为我有一个3MB大小的文件。即使将StringBuffer更改为stringbuilder,它也会说同样的例外:不要使用这两个:)