feat: Implement external job import logging functionality with independent log files

ruoyi-bussiness/src/test/java/com/ruoyi/cms/externalimport/ExternalJobImportRunLogTest.java

@@ -0,0 +1,43 @@
+package com.ruoyi.cms.externalimport;
+
+import org.junit.jupiter.api.Test;
+
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class ExternalJobImportRunLogTest {
+    @Test
+    void createsIndependentUtf8LogForEachRun() throws Exception {
+        Path directory = Files.createTempDirectory("external-job-import-run-log-");
+        Path firstFile = null;
+        Path secondFile = null;
+        try {
+            try (ExternalJobImportRunLog first = ExternalJobImportRunLog.open(directory.toString())) {
+                first.info("第一份任务日志");
+                firstFile = first.getFile();
+            }
+            try (ExternalJobImportRunLog second = ExternalJobImportRunLog.open(directory.toString())) {
+                second.error("第二份任务日志异常", new IllegalStateException("test failure"));
+                secondFile = second.getFile();
+            }
+
+            assertTrue(Files.exists(firstFile));
+            assertTrue(Files.exists(secondFile));
+            assertNotEquals(firstFile, secondFile);
+            assertTrue(new String(Files.readAllBytes(firstFile), StandardCharsets.UTF_8).contains("第一份任务日志"));
+            assertTrue(new String(Files.readAllBytes(secondFile), StandardCharsets.UTF_8).contains("test failure"));
+        } finally {
+            if (firstFile != null) {
+                Files.deleteIfExists(firstFile);
+            }
+            if (secondFile != null) {
+                Files.deleteIfExists(secondFile);
+            }
+            Files.deleteIfExists(directory);
+        }
+    }
+}