修复：综合浏览导出数据时，因数据表数据包含null值时，导致后台报错的问题

shandan-browser/src/main/java/com/keyware/shandan/browser/service/ExportComponent.java

@@ -21,14 +21,12 @@ import com.keyware.shandan.system.service.SysFileService;
 import com.keyware.shandan.system.utils.SysSettingUtil;
 import lombok.AllArgsConstructor;
 
-import java.io.ByteArrayOutputStream;
 import java.io.File;
-import java.io.IOException;
-import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
 import java.util.Map;
+import java.util.stream.Collectors;
 
 public class ExportComponent {
     private final String exportId;
@@ -107,9 +105,8 @@ public class ExportComponent {
             JSONObject col = (JSONObject) json;
             String comment = col.getString("comment");
             String colName = col.getString("columnName");
-            String name = StringUtils.hasTextByDefault(comment, colName);
             colNameList.add(colName);
-            return name;
+            return colName + (StringUtils.hasText(comment) ? "[" + comment + "]" : "");
         }).toList();
 
         // 添加第一行
@@ -118,7 +115,13 @@ public class ExportComponent {
         // 遍历数据
         datas.forEach(data -> {
             // 遍历字段列名，获取对应数据并拼接成列的集合
-            List<String> cells = StreamUtil.as(colNameList).map(col -> data.get(col).toString()).toList();
+            List<String> cells = colNameList.stream().map(col -> {
+                Object value = data.get(col);
+                if (value == null) {
+                    return "";
+                }
+                return String.valueOf(value);
+            }).collect(Collectors.toList());
             rowList.add(cells);
         });
 
@@ -189,7 +192,7 @@ public class ExportComponent {
 
     private void delete(String path) {
         File file = new File(path);
-        if(file.exists()){
+        if (file.exists()) {
             file.delete();
         }
     }