文件上传测试案例的一些修改

easyexcel-test/src/test/java/com/alibaba/easyexcel/test/demo/web/UploadDataListener.java

@@ -8,14 +8,19 @@ import com.alibaba.excel.util.ListUtils;
 import com.alibaba.fastjson.JSON;
 
 import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.config.ConfigurableBeanFactory;
+import org.springframework.context.annotation.Scope;
+import org.springframework.stereotype.Component;
 
 /**
  * 模板的读取类
  *
  * @author Jiaju Zhuang
  */
-// 有个很重要的点 DemoDataListener 不能被spring管理，要每次读取excel都要new,然后里面用到spring可以构造方法传进去
 @Slf4j
+@Component
+@Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
 public class UploadDataListener implements ReadListener<UploadData> {
     /**
      * 每隔5条存储数据库，实际使用中可以100条，然后清理list ，方便内存回收
@@ -25,22 +30,9 @@ public class UploadDataListener implements ReadListener<UploadData> {
     /**
      * 假设这个是一个DAO，当然有业务逻辑这个也可以是一个service。当然如果不用存储这个对象没用。
      */
+    @Autowired
     private UploadDAO uploadDAO;
 
-    public UploadDataListener() {
-        // 这里是demo，所以随便new一个。实际使用如果到了spring,请使用下面的有参构造函数
-        uploadDAO = new UploadDAO();
-    }
-
-    /**
-     * 如果使用了spring,请使用这个构造方法。每次创建Listener的时候需要把spring管理的类传进来
-     *
-     * @param uploadDAO
-     */
-    public UploadDataListener(UploadDAO uploadDAO) {
-        this.uploadDAO = uploadDAO;
-    }
-
     /**
      * 这个每一条数据解析都会来调用
      *
@@ -54,8 +46,6 @@ public class UploadDataListener implements ReadListener<UploadData> {
         // 达到BATCH_COUNT了，需要去存储一次数据库，防止数据几万条数据在内存，容易OOM
         if (cachedDataList.size() >= BATCH_COUNT) {
             saveData();
-            // 存储完成清理 list
-            cachedDataList = ListUtils.newArrayListWithExpectedSize(BATCH_COUNT);
         }
     }
 
@@ -67,7 +57,9 @@ public class UploadDataListener implements ReadListener<UploadData> {
     @Override
     public void doAfterAllAnalysed(AnalysisContext context) {
         // 这里也要保存数据，确保最后遗留的数据也存储到数据库
-        saveData();
+        if (cachedDataList.size() > 0) {
+            saveData();
+        }
         log.info("所有数据解析完成！");
     }
 
@@ -77,6 +69,19 @@ public class UploadDataListener implements ReadListener<UploadData> {
     private void saveData() {
         log.info("{}条数据，开始存储数据库！", cachedDataList.size());
         uploadDAO.save(cachedDataList);
+        cachedDataList = ListUtils.newArrayListWithExpectedSize(BATCH_COUNT);
         log.info("存储数据库成功！");
     }
+
+    /**
+     * 保证在invoke解析数据或者写入数据库发生异常都能将cachedDataList清理
+     * @param exception
+     * @param context
+     * @throws Exception
+     */
+    @Override
+    public void onException(Exception exception, AnalysisContext context) throws Exception {
+        cachedDataList.clear();
+        ReadListener.super.onException(exception, context);
+    }
 }

easyexcel-test/src/test/java/com/alibaba/easyexcel/test/demo/web/WebTest.java

@@ -17,6 +17,7 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.ResponseBody;
 import org.springframework.web.multipart.MultipartFile;
 
@@ -29,7 +30,7 @@ import org.springframework.web.multipart.MultipartFile;
 public class WebTest {
 
     @Autowired
-    private UploadDAO uploadDAO;
+    private UploadDataListener uploadDataListener;
 
     /**
      * 文件下载（失败了会返回一个有部分数据的Excel）
@@ -93,7 +94,7 @@ public class WebTest {
     @PostMapping("upload")
     @ResponseBody
     public String upload(MultipartFile file) throws IOException {
-        EasyExcel.read(file.getInputStream(), UploadData.class, new UploadDataListener(uploadDAO)).sheet().doRead();
+        EasyExcel.read(file.getInputStream(), UploadData.class, uploadDataListener).sheet().doRead();
         return "success";
     }