解决综合浏览数据表导出数据量过大时异常的问题

shandan-browser/src/main/java/com/keyware/shandan/browser/controller/SearchController.java

@@ -32,7 +32,6 @@ import java.io.File;
 import java.io.IOException;
 import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
 
 /**
  * 组合搜索前端控制器
@@ -233,10 +232,8 @@ public class SearchController {
         String userId = auth.getPrincipal().toString();
         MetaTableExport export = ExportCache.getCache(userId, null);
         if (export == null) {
-            int count = metadataDataService.count(metadata, condition);
             MetaTableExport newExport = new MetaTableExport(userId, metadata);
-            newExport.queryData((o) -> metadataDataService.queryDataByHandler(metadata, condition, newExport));
-            newExport.setDataCount(count);
+            newExport.setQueryHandler((list) -> list.addAll(metadataDataService.list(metadata, condition)));
             export = newExport;
             ExportCache.startExport(export);
         }

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

@@ -6,6 +6,7 @@ import com.keyware.shandan.browser.entity.SearchConditionVo;
 import org.apache.ibatis.session.ResultHandler;
 
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
 /**
@@ -19,5 +20,8 @@ public interface MetadataDataService {
 
     int count(MetadataBasicVo metadata, SearchConditionVo condition);
 
+    List<Map<String, Object>> list(MetadataBasicVo metadata, SearchConditionVo condition);
+
     void queryDataByHandler(MetadataBasicVo metadata, SearchConditionVo condition, ResultHandler<HashMap<String, Object>> handler);
+
 }

shandan-browser/src/main/java/com/keyware/shandan/browser/service/impl/MetadataDataServiceImpl.java

@@ -75,6 +75,15 @@ public class MetadataDataServiceImpl implements MetadataDataService {
         return dynamicDatasourceMapper.count(sql);
     }
 
+    @Override
+    public List<Map<String, Object>> list(MetadataBasicVo metadata, SearchConditionVo condition) {
+        String sql = getQuerySql(metadata, condition);
+        sql += condition.getOrderBySql();
+        List<Map<String, Object>> list = dynamicDatasourceMapper.list(sql);
+        list.forEach(item-> item.entrySet().forEach(this::convertBigTextField));
+        return list;
+    }
+
     @Override
     public void queryDataByHandler(MetadataBasicVo metadata, SearchConditionVo condition, ResultHandler<HashMap<String, Object>> handler) {
         String sql = getQuerySql(metadata, condition);

shandan-system/src/main/java/com/keyware/shandan/bianmu/export/ExportProgress.java

@@ -60,7 +60,7 @@ public abstract class ExportProgress implements Runnable, Serializable {
      * @return
      */
     public boolean getIsDone() {
-        return currentStep == getStepTotal();
+        return currentStep >= getStepTotal() && this.currentStep > 0 && this.getStepTotal() > 0;
     }
 
     protected void setDone() {

shandan-system/src/main/java/com/keyware/shandan/bianmu/export/MetaTableExport.java

@@ -3,37 +3,32 @@ package com.keyware.shandan.bianmu.export;
 import cn.hutool.core.collection.CollUtil;
 import cn.hutool.poi.excel.BigExcelWriter;
 import cn.hutool.poi.excel.ExcelUtil;
-import cn.hutool.poi.excel.ExcelWriter;
 import com.alibaba.fastjson.JSONArray;
 import com.alibaba.fastjson.JSONObject;
 import com.keyware.shandan.bianmu.entity.MetadataBasicVo;
 import com.keyware.shandan.bianmu.service.MetadataService;
-import com.keyware.shandan.common.util.StreamUtil;
 import com.keyware.shandan.common.util.StringUtils;
 import com.keyware.shandan.frame.config.component.AppContext;
-import org.apache.ibatis.session.ResultContext;
-import org.apache.ibatis.session.ResultHandler;
 
 import java.io.File;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.function.Consumer;
 import java.util.stream.Collectors;
 
-public class MetaTableExport extends ExportProgress implements ResultHandler<HashMap<String, Object>> {
+public class MetaTableExport extends ExportProgress {
     private final MetadataBasicVo metadata;
-    private Consumer<Object> queryFunc;
     private final String fileName;
-    private JSONArray colsArray;
     private final MetadataService metadataService;
 
     // 所有行的集合
-    private List<List<String>> rowList = new ArrayList<>();
+    private final List<List<String>> rowList = new ArrayList<>();
     // 字段列名集合
-    private List<String> colNameList = new ArrayList<>();
-    private int dataTotal;
+    private final List<String> colNameList = new ArrayList<>();
+    private final List<Map<String, Object>> datas = new ArrayList<>();
+    private Consumer<List<Map<String, Object>>> queryHandler;
+    private boolean isDone = false;
 
     public MetaTableExport(String userId, MetadataBasicVo metadata) {
         super(userId);
@@ -49,7 +44,7 @@ public class MetaTableExport extends ExportProgress implements ResultHandler<Has
     @Override
     public void run() {
         this.setTitle("正在读取数据表信息");
-        colsArray = metadataService.getColumns(metadata.getId());
+        JSONArray colsArray = metadataService.getColumns(metadata.getId());
 
         // 添加第一行，字段列名注释集合，当做表格的第一行
         rowList.add(colsArray.stream().map((json) -> {
@@ -60,26 +55,37 @@ public class MetaTableExport extends ExportProgress implements ResultHandler<Has
             return colName + (StringUtils.hasText(comment) ? "[" + comment + "]" : "");
         }).collect(Collectors.toList()));
 
-        this.setTitle("正在读取数据到临时文件");
 
-        // 执行数据查询
         try {
-            queryFunc.accept(null);
+            this.setTitle("正在查询数据");
+            this.autoAddStep();
+            this.queryHandler.accept(this.datas);
+            handleResult();
+
 
             File file = new File(fileName);
-            if(file.exists()){
+            if (file.exists()) {
                 file.delete();
             }
             List<List<String>> rows = CollUtil.newArrayList(rowList);
             //通过工具类创建writer
-            ExcelWriter writer = ExcelUtil.getWriter(file);
+            BigExcelWriter writer = ExcelUtil.getBigWriter(file);
+
+            this.setTitle("正在写入缓存");
+            this.autoAddStep();
             //一次性写出内容
             writer.write(rows);
-            //关闭writer，释放内存
+
+            this.setTitle("正在写入文件");
+            this.autoAddStep();
+            //写入文件后关闭writer，释放内存
             writer.close();
+
+            this.autoAddStep();
             this.setTitle("数据文件准备完毕，开始下载");
-            this.setDone();
+            isDone = true;
         } catch (Exception e) {
+            e.printStackTrace();
             this.error = true;
             this.setTitle("准备数据时出现异常");
             this.clean();
@@ -88,7 +94,7 @@ public class MetaTableExport extends ExportProgress implements ResultHandler<Has
 
     @Override
     public long getStepTotal() {
-        return this.dataTotal;
+        return 4;
     }
 
     @Override
@@ -96,9 +102,8 @@ public class MetaTableExport extends ExportProgress implements ResultHandler<Has
         return this.fileName;
     }
 
-    @Override
-    public void handleResult(ResultContext<? extends HashMap<String, Object>> context) {
-        Map<String, Object> data = context.getResultObject();
+    public void handleResult() {
+        for (Map<String, Object> data : this.datas) {
             // 遍历字段列名，获取对应数据并拼接成列的集合
             List<String> cells = colNameList.stream().map(col -> {
                 Object value = data.get(col);
@@ -106,14 +111,15 @@ public class MetaTableExport extends ExportProgress implements ResultHandler<Has
                 return String.valueOf(value);
             }).collect(Collectors.toList());
             rowList.add(cells);
-        this.autoAddStep();
+        }
     }
 
-    public void queryData(Consumer<Object> query) {
-        this.queryFunc = query;
+    public void setQueryHandler(Consumer<List<Map<String, Object>>> handler) {
+        this.queryHandler = handler;
     }
 
-    public void setDataCount(int count) {
-        this.dataTotal = count;
+    @Override
+    public boolean getIsDone() {
+        return isDone;
     }
 }

shandan-system/src/main/java/com/keyware/shandan/datasource/mapper/DynamicDatasourceMapper.java

@@ -25,6 +25,7 @@ import java.util.Map;
 public interface DynamicDatasourceMapper {
 
     @Select("${sql}")
+    @ResultType(HashMap.class)
     List<Map<String, Object>> list(String sqlStr);
 
     @Select("${sql}")