多表导出导出到一个电子表格代码实现：

用例见ExcelUtilTool类demomain方法

ruoyi-common/ruoyi-common-core/src/main/java/com/ruoyi/common/core/utils/poi/DjpdGsA.java

@@ -26,6 +26,7 @@ import javax.validation.constraints.NotBlank;
 @NoArgsConstructor
 @TableName("zwyw_djpd_gs")
 @ApiModel("等级评定公示信息")
+
 public class DjpdGsA extends BaseEntity
 {
     private static final long serialVersionUID = 1L;

ruoyi-common/ruoyi-common-core/src/main/java/com/ruoyi/common/core/utils/poi/DjpdGsB.java

@@ -26,6 +26,7 @@ import javax.validation.constraints.NotBlank;
 @NoArgsConstructor
 @TableName("zwyw_djpd_gs")
 @ApiModel("等级评定公示信息")
+
 public class DjpdGsB extends BaseEntity
 {
     private static final long serialVersionUID = 1L;

ruoyi-common/ruoyi-common-core/src/main/java/com/ruoyi/common/core/utils/poi/ExcelUtilMTab.java

@@ -38,6 +38,7 @@ import java.util.Set;
  *
  * @author ruoyi
  */
+
 public class ExcelUtilMTab
 {
     private static final Logger log = LoggerFactory.getLogger(ExcelUtilMTab.class);

ruoyi-common/ruoyi-common-core/src/main/java/com/ruoyi/common/core/utils/poi/ExcelUtilTool.java

@@ -21,6 +21,7 @@ import java.util.stream.Collectors;
  *
  * @author ruoyi
  */
+
 public class ExcelUtilTool<T>
 {
     private static final Logger log = LoggerFactory.getLogger(ExcelUtilTool.class);

ruoyi-common/ruoyi-common-core/src/main/java/com/ruoyi/common/core/utils/poi/ExeclTempBean.java

@@ -2,6 +2,7 @@ package com.ruoyi.common.core.utils.poi;
 
 import java.util.List;
 
+
 public class ExeclTempBean {
     public List<Object[]> fields;
     public List<Object[]> rowdata;