java - java.lang.OutOfMemoryError:100000条记录的Java堆空间

尝试使用以下代码编写Excel文件

public static void main(String[] args)
    {
          XSSFWorkbook workbook = new XSSFWorkbook();

            XSSFSheet sheet = workbook.createSheet("Book Data");

            Map<String, Object[]> data = new TreeMap<String, Object[]>();
            data.put("1", new Object[] {"ID", "NAME", "LASTNAME"});
            for(int i=2;i<100000;i++)
            {
                data.put(String.valueOf(i), new Object[] {i, "Name"+i, "LastName"+i});
            }

            Set<String> keyset = data.keySet();
            int rownum = 0;
            for (String key : keyset)
            {
                Row row = sheet.createRow(rownum++);
                Object [] objArr = data.get(key);
                int cellnum = 0;
                for (Object obj : objArr)
                {
                   Cell cell = row.createCell(cellnum++);
                   if(obj instanceof String)
                        cell.setCellValue((String)obj);
                    else if(obj instanceof Integer)
                        cell.setCellValue((Integer)obj);
                }
            }
            try
            {

                FileOutputStream out = new FileOutputStream(new File("D:\\nameandlname.xlsx"));
                workbook.write(out);
                out.close();
                System.out.println("nameandlname.xlsx written successfully.");
            }
            catch (Exception e)
            {
                e.printStackTrace();
            }
    }

VM arguments -Xms512M -Xmx1024M
eclipse.ini:

-startup
plugins/org.eclipse.equinox.launcher_1.1.0.v20100507.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_1.1.1.R36x_v20100810
-product
org.eclipse.epp.package.jee.product
--launcher.defaultAction
openFile
--launcher.XXMaxPermSize
1024M
-showsplash
org.eclipse.platform
--launcher.XXMaxPermSize
256m
--launcher.defaultAction
openFile
-vmargs
-Dosgi.requiredJavaVersion=1.5
-Xms512m
-Xmx1024m
-vm
C:/Program Files (x86)/Java/jdk1.6.0_21/bin/javaw.exe

最后错误得到:

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
    at org.apache.xmlbeans.impl.store.Saver$TextSaver.resize(Saver.java:1592)
    at org.apache.xmlbeans.impl.store.Saver$TextSaver.preEmit(Saver.java:1223)
    at org.apache.xmlbeans.impl.store.Saver$TextSaver.emit(Saver.java:1144)

最佳答案

您需要的是SXSSF(流用户模型API)。

SXSSF(软件包:org.apache.poi.xssf.streaming)是XSSF的API兼容流扩展，可用于必须生成非常大的电子表格且堆空间有限的情况。

该页面上也有一个示例:您需要将XSSFWorkbook替换为SXSSFWorkbook。