StyleTang commented on a change in pull request #37:
URL: https://github.com/apache/rocketmq-dashboard/pull/37#discussion_r741161796



##########
File path: 
src/main/java/org/apache/rocketmq/dashboard/service/impl/DlqMessageServiceImpl.java
##########
@@ -65,4 +68,16 @@ public MessagePage queryDlqMessageByPage(MessageQuery query) 
{
         }
         return messageService.queryMessageByPage(query);
     }
+
+    @Override
+    public ConsumeMessageDirectlyResult 
batchResendDlqMessage(List<DlqMessageRequest> dlqMessages) {
+        List<ConsumeMessageDirectlyResult> consumeMessageDirectlyResults = new 
LinkedList<>();
+        for (DlqMessageRequest dlqMessage : dlqMessages) {
+            ConsumeMessageDirectlyResult consumeMessageDirectlyResult = 
messageService.consumeMessageDirectly(dlqMessage.getTopicName(),
+                dlqMessage.getMsgId(), dlqMessage.getConsumerGroup(),
+                dlqMessage.getClientId());
+            consumeMessageDirectlyResults.add(consumeMessageDirectlyResult);
+        }
+        return consumeMessageDirectlyResults.get(0);

Review comment:
       Batch resend the message but just get the first result. If we do a batch 
operation, we should get all the results.

##########
File path: 
src/main/java/org/apache/rocketmq/dashboard/model/DlqMessageRequest.java
##########
@@ -0,0 +1,60 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.rocketmq.dashboard.model;
+

Review comment:
       getters/setters can be generated by `@Data`

##########
File path: 
src/main/java/org/apache/rocketmq/dashboard/controller/DlqMessageController.java
##########
@@ -70,4 +76,30 @@ public void exportDlqMessage(HttpServletResponse response, 
@RequestParam String
             throw new ServiceException(-1, String.format("export dlq message 
failed!"));
         }
     }
+
+    @PostMapping(value = "/batchResendDlqMessage.do")
+    @ResponseBody
+    public Object batchResendDlqMessage(@RequestBody List<DlqMessageRequest> 
dlqMessages) {
+        return dlqMessageService.batchResendDlqMessage(dlqMessages);
+    }
+
+    @PostMapping(value = "/batchExportDlqMessage.do")
+    public void batchExportDlqMessage(HttpServletResponse response, 
@RequestBody List<DlqMessageRequest> dlqMessages) {
+        List<DlqMessageExcelModel> dlqMessageExcelModelList = new 
ArrayList<>(dlqMessages.size());
+        for (DlqMessageRequest dlqMessage : dlqMessages) {
+            try {
+                String topic = MixAll.DLQ_GROUP_TOPIC_PREFIX + 
dlqMessage.getConsumerGroup();
+                MessageExt messageExt = mqAdminExt.viewMessage(topic, 
dlqMessage.getMsgId());
+                DlqMessageExcelModel excelModel = new 
DlqMessageExcelModel(messageExt);
+                dlqMessageExcelModelList.add(excelModel);
+            } catch (Exception e) {
+                log.error("Failed to query message by Id:{}", 
dlqMessage.getMsgId());

Review comment:
       Maybe returning the failed record with message-id and fail reason is 
better than just ignoring the exception.
   ```java
   DlqMessageExcelModel excelModel = new DlqMessageExcelModel();
   excelModel.setMessageId(messageId);
   excelModel.setException(error);
   dlqMessageExcelModelList.add(excelModel);
   ```




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