[Fix-17281][alert] Fix the content exceed 32767 characters will throw exception in excel (#17283)

Author: hkun0120

dolphinscheduler-alert/dolphinscheduler-alert-plugins/dolphinscheduler-alert-email/src/main/java/org/apache/dolphinscheduler/plugin/alert/email/ExcelUtils.java

@@ -21,6 +21,7 @@
 import org.apache.dolphinscheduler.plugin.alert.email.exception.AlertEmailException;
 
 import org.apache.commons.collections4.CollectionUtils;
+import org.apache.poi.ss.SpreadsheetVersion;
 import org.apache.poi.ss.usermodel.Cell;
 import org.apache.poi.ss.usermodel.CellStyle;
 import org.apache.poi.ss.usermodel.HorizontalAlignment;
@@ -108,7 +109,12 @@ public static void genExcelFile(String content, String title, String xlsFilePath
                     if (values[j] instanceof Number) {
                         cell1.setCellValue(((Number) values[j]).doubleValue());
                     } else {
-                        cell1.setCellValue(String.valueOf(values[j]));
+                        String cellValue = String.valueOf(values[j]);
+                        int maxLen = SpreadsheetVersion.EXCEL2007.getMaxTextLength();
+                        if (cellValue.length() > maxLen) {
+                            cellValue = cellValue.substring(0, maxLen - 67) + "...(truncated)";
+                        }
+                        cell1.setCellValue(cellValue);
                     }
                 }
             }

dolphinscheduler-alert/dolphinscheduler-alert-plugins/dolphinscheduler-alert-email/src/test/java/org/apache/dolphinscheduler/plugin/alert/email/ExcelUtilsTest.java

@@ -17,7 +17,16 @@
 
 package org.apache.dolphinscheduler.plugin.alert.email;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.apache.poi.ss.SpreadsheetVersion;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.ss.usermodel.Sheet;
+import org.apache.poi.ss.usermodel.Workbook;
+import org.apache.poi.ss.usermodel.WorkbookFactory;
+
 import java.io.File;
+import java.io.FileInputStream;
 import java.nio.file.Path;
 
 import org.junit.jupiter.api.Assertions;
@@ -33,7 +42,7 @@ public class ExcelUtilsTest {
     private String xlsFilePath;
 
     @BeforeEach
-    public void setUp() {
+    void setUp() {
         xlsFilePath = testFolder.toString();
     }
 
@@ -56,8 +65,9 @@ public void testGenExcelFile() {
         Assertions.assertTrue(xlsFile.exists());
 
         // Invoke genExcelFile with incorrectContent, will cause RuntimeException
-        Assertions.assertThrows(IllegalArgumentException.class,
-                () -> ExcelUtils.genExcelFile(incorrectContent1, title, xlsFilePath));
+        Assertions.assertThrows(IllegalArgumentException.class, () -> {
+            ExcelUtils.genExcelFile(incorrectContent1, title, xlsFilePath);
+        });
 
     }
 
@@ -74,4 +84,32 @@ public void testGenExcelFileByCheckDir() {
         file.delete();
         Assertions.assertFalse(file.exists());
     }
+
+    @Test
+    void testGenExcelFile_TruncateLongString() throws Exception {
+        String title = "truncate_test";
+        String longStrKey = "longStr";
+        int maxLen = SpreadsheetVersion.EXCEL2007.getMaxTextLength();
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i < maxLen + 100; i++) {
+            sb.append('X');
+        }
+        String longValue = sb.toString();
+        String content = "[{\"" + longStrKey + "\":\"" + longValue + "\"}]";
+
+        ExcelUtils.genExcelFile(content, title, xlsFilePath);
+
+        try (
+                FileInputStream fis = new FileInputStream(xlsFilePath + "/" + title + ".xlsx");
+                Workbook wb = WorkbookFactory.create(fis)) {
+
+            Sheet sheet = wb.getSheetAt(0);
+            Row headerRow = sheet.getRow(0);
+            Row dataRow = sheet.getRow(1);
+
+            assertEquals(longStrKey, headerRow.getCell(0).getStringCellValue());
+            String expected = longValue.substring(0, maxLen - 67) + "...(truncated)";
+            assertEquals(expected, dataRow.getCell(0).getStringCellValue());
+        }
+    }
 }