导出Excel，@Excel注解使用dictType属性时，如果有大量的字典数据，就会有大量的查询redis(打开、关闭)，导致特别慢。于是使用map存储字典数据，相同的key就不需要再次去查询redis，大大提高了导出效率。

ruoyi-common/src/main/java/com/ruoyi/common/utils/poi/ExcelUtil.java

@@ -1,74 +1,5 @@
 package com.ruoyi.common.utils.poi;
 
-import java.io.File;
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-import java.lang.reflect.Field;
-import java.lang.reflect.Method;
-import java.lang.reflect.ParameterizedType;
-import java.math.BigDecimal;
-import java.text.DecimalFormat;
-import java.time.LocalDate;
-import java.time.LocalDateTime;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Collection;
-import java.util.Comparator;
-import java.util.Date;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-import java.util.UUID;
-import java.util.stream.Collectors;
-import javax.servlet.http.HttpServletResponse;
-import org.apache.commons.lang3.ArrayUtils;
-import org.apache.commons.lang3.RegExUtils;
-import org.apache.commons.lang3.reflect.FieldUtils;
-import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
-import org.apache.poi.hssf.usermodel.HSSFPicture;
-import org.apache.poi.hssf.usermodel.HSSFPictureData;
-import org.apache.poi.hssf.usermodel.HSSFShape;
-import org.apache.poi.hssf.usermodel.HSSFSheet;
-import org.apache.poi.hssf.usermodel.HSSFWorkbook;
-import org.apache.poi.ooxml.POIXMLDocumentPart;
-import org.apache.poi.ss.usermodel.BorderStyle;
-import org.apache.poi.ss.usermodel.Cell;
-import org.apache.poi.ss.usermodel.CellStyle;
-import org.apache.poi.ss.usermodel.CellType;
-import org.apache.poi.ss.usermodel.ClientAnchor;
-import org.apache.poi.ss.usermodel.DataValidation;
-import org.apache.poi.ss.usermodel.DataValidationConstraint;
-import org.apache.poi.ss.usermodel.DataValidationHelper;
-import org.apache.poi.ss.usermodel.DateUtil;
-import org.apache.poi.ss.usermodel.Drawing;
-import org.apache.poi.ss.usermodel.FillPatternType;
-import org.apache.poi.ss.usermodel.Font;
-import org.apache.poi.ss.usermodel.HorizontalAlignment;
-import org.apache.poi.ss.usermodel.IndexedColors;
-import org.apache.poi.ss.usermodel.Name;
-import org.apache.poi.ss.usermodel.PictureData;
-import org.apache.poi.ss.usermodel.Row;
-import org.apache.poi.ss.usermodel.Sheet;
-import org.apache.poi.ss.usermodel.VerticalAlignment;
-import org.apache.poi.ss.usermodel.Workbook;
-import org.apache.poi.ss.usermodel.WorkbookFactory;
-import org.apache.poi.ss.util.CellRangeAddress;
-import org.apache.poi.ss.util.CellRangeAddressList;
-import org.apache.poi.util.IOUtils;
-import org.apache.poi.xssf.streaming.SXSSFWorkbook;
-import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
-import org.apache.poi.xssf.usermodel.XSSFDataValidation;
-import org.apache.poi.xssf.usermodel.XSSFDrawing;
-import org.apache.poi.xssf.usermodel.XSSFPicture;
-import org.apache.poi.xssf.usermodel.XSSFShape;
-import org.apache.poi.xssf.usermodel.XSSFSheet;
-import org.apache.poi.xssf.usermodel.XSSFWorkbook;
-import org.openxmlformats.schemas.drawingml.x2006.spreadsheetDrawing.CTMarker;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 import com.ruoyi.common.annotation.Excel;
 import com.ruoyi.common.annotation.Excel.ColumnType;
 import com.ruoyi.common.annotation.Excel.Type;
@@ -84,6 +15,32 @@ import com.ruoyi.common.utils.file.FileTypeUtils;
 import com.ruoyi.common.utils.file.FileUtils;
 import com.ruoyi.common.utils.file.ImageUtils;
 import com.ruoyi.common.utils.reflect.ReflectUtils;
+import org.apache.commons.lang3.ArrayUtils;
+import org.apache.commons.lang3.RegExUtils;
+import org.apache.commons.lang3.reflect.FieldUtils;
+import org.apache.poi.hssf.usermodel.*;
+import org.apache.poi.ooxml.POIXMLDocumentPart;
+import org.apache.poi.ss.usermodel.*;
+import org.apache.poi.ss.util.CellRangeAddress;
+import org.apache.poi.ss.util.CellRangeAddressList;
+import org.apache.poi.util.IOUtils;
+import org.apache.poi.xssf.streaming.SXSSFWorkbook;
+import org.apache.poi.xssf.usermodel.*;
+import org.openxmlformats.schemas.drawingml.x2006.spreadsheetDrawing.CTMarker;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.servlet.http.HttpServletResponse;
+import java.io.*;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.lang.reflect.ParameterizedType;
+import java.math.BigDecimal;
+import java.text.DecimalFormat;
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.util.*;
+import java.util.stream.Collectors;
 
 /**
  * Excel相关处理
@@ -99,6 +56,12 @@ public class ExcelUtil<T>
     public static final String[] FORMULA_STR = { "=", "-", "+", "@" };
 
     /**
+     * 导出Excel时，如果有大量的字典数据，就会有大量的查询redis(打开、关闭)，导致特别慢。
+     * 于是使用map存储字典数据，相同的key就不需要再次去查询redis
+     */
+    public Map<String,String> sysDictMap = new HashMap<String,String>();
+
+    /**
      * Excel sheet最大行数，默认65536
      */
     public static final int sheetSize = 65536;
@@ -1034,7 +997,11 @@ public class ExcelUtil<T>
                 }
                 else if (StringUtils.isNotEmpty(dictType) && StringUtils.isNotNull(value))
                 {
-                    cell.setCellValue(convertDictByExp(Convert.toStr(value), dictType, separator));
+                    if (!sysDictMap.containsKey(dictType+value)){
+                        String lable = convertDictByExp(Convert.toStr(value), dictType, separator);
+                        sysDictMap.put(dictType+value,lable);
+                    }
+                    cell.setCellValue(sysDictMap.get(dictType+value));
                 }
                 else if (value instanceof BigDecimal && -1 != attr.scale())
                 {