Add excel-export module: Apache POI 6.0.0 XSSF vs SXSSF under a fixed heap, 1,000,000 rows streamed with StreamingResponseBody, OpenCSV, sheet rolling, temp-file cleanup

Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_017ic4b4VQVEJWetTT1dYzyJ
2026-10-29 06:18:42 +00:00
parent bded24d929
commit 9b1da079c6
29 changed files with 1113 additions and 0 deletions
@@ -0,0 +1,18 @@
+first bytes: EF BB BF (UTF-8 BOM so Excel reads UTF-8)
+rows written: 3
+  Order id,Order date,Region,Product,Qty,Unit price,Amount,Status,Note
+  1,2025-05-30,Chennai,Product-384,20,464.83,9296.60,RETURNED,INV/2025-26/0000001 dispatched via hub 71
+  2,2025-07-29,Pune,Product-121,20,596.20,11924.00,RETURNED,INV/2025-26/0000002 dispatched via hub 46
+  3,2025-11-22,Kolkata,Product-6,11,61.05,671.55,SHIPPED,INV/2025-26/0000003 dispatched via hub 51
+
+comma, quote and newline inside fields: "Pune, MH","said ""hi""","line1\nline2"\n
+
+  =HYPERLINK("http://x","pay")     -> '=HYPERLINK("http://x","pay")
+  +91 98200 00000                  -> '+91 98200 00000
+  -2+3                             -> '-2+3
+  @SUM(A1)                         -> '@SUM(A1)
+  Mumbai                           -> Mumbai
+
+raw CSVWriter into a broken stream: writeNext called 10,000 times, none threw
+  checkError() = true, getException() = java.io.IOException: Broken pipe
+CsvExporter into the same stream: IOException: CSV write failed (cause: java.io.IOException: Broken pipe)