refactor(接口测试): 按照线程组隔离文件读取逻辑

Signed-off-by: fit2-zhao <yong.zhao@fit2cloud.com>

framework/sdk-parent/jmeter/src/main/java/org/apache/jmeter/services/FileServer.java

@@ -575,8 +575,15 @@ public class FileServer {
      * @return {@link File} instance
      */
     public File getResolvedFile(String path) {
+        log.info("getResolvedFile: {}", path);
+        String threadName = JMeterContextService.getContext().getThread().getThreadName();
+        if (!StringUtils.contains(path, threadName)) {
+            path = StringUtils.join(threadName, path);
+        }
         reserveFile(path);
-        return files.get(path).file;
+
+        FileEntry fileEntry = files.get(path);
+        return fileEntry != null ? fileEntry.file : null;
     }
 
     private static class FileEntry {