fixes output folder in zip file

modules/swagger-generator/src/main/java/io/swagger/v3/generator/online/GeneratorController.java

@@ -386,7 +386,7 @@ private ResponseContext downloadFile(File outputRootFolder, File outputContentFo
 
         final ZipUtil zipUtil = new ZipUtil();
         try {
-            zipUtil.compressFiles(Arrays.asList(outputContentFolder.listFiles()), outputFile.getAbsolutePath());
+            zipUtil.compressFiles(Arrays.asList(outputRootFolder.listFiles()), outputFile.getAbsolutePath());
         } catch (IOException e) {
             return new ResponseContext()
                     .status(500)

modules/swagger-generator/src/test/java/io/swagger/v3/generator/online/GeneratorControllerTest.java

@@ -0,0 +1,42 @@
+package io.swagger.v3.generator.online;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import io.swagger.codegen.v3.service.GenerationRequest;
+import io.swagger.codegen.v3.service.Options;
+import io.swagger.oas.inflector.models.RequestContext;
+import io.swagger.oas.inflector.models.ResponseContext;
+import io.swagger.v3.core.util.Json;
+import org.apache.commons.io.FileUtils;
+import org.testng.Assert;
+import org.testng.annotations.Test;
+
+import javax.ws.rs.core.MediaType;
+import java.io.File;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public class GeneratorControllerTest {
+    @Test
+    public void generateJava() throws Exception {
+        String json = FileUtils.readFileToString(new File("src/test/resources/petstore-oas3.json"));
+        JsonNode node = Json.mapper().readTree(json);
+        Map<String, Object> spec = Json.mapper().convertValue(node, LinkedHashMap.class);
+
+
+        GenerationRequest generationRequest = new GenerationRequest()
+                .spec(spec)
+                .lang("java")
+                .options(new Options()
+                        .outputDir("testout")
+                        .addAdditionalProperty("outputFolder", "testoutputFolder")
+                        .addAdditionalProperty("useRuntimeException", true)
+                        .addAdditionalProperty("useRxJava", true));
+
+        GeneratorController g = new GeneratorController();
+        RequestContext r = new RequestContext();
+        ResponseContext rr = g.generate(r, generationRequest);
+        Assert.assertEquals(rr.getStatus(), 200);
+        Assert.assertEquals(rr.getContentType(), MediaType.APPLICATION_OCTET_STREAM_TYPE);
+        Assert.assertTrue(rr.getHeaders().getFirst("Content-Disposition").contains(" filename=\"java-client-generated.zip\""));
+    }
+}