easyexcel依赖

pom.xml

@@ -60,6 +60,11 @@
             <artifactId>commons-net</artifactId>
             <version>3.3</version>
         </dependency>
+        <dependency>
+            <groupId>com.alibaba</groupId>
+            <artifactId>easyexcel</artifactId>
+            <version>3.1.1</version>
+        </dependency>
 
 <!--        <dependency>-->
 <!--            <groupId>org.springframework.boot</groupId>-->

src/main/java/com/gunshi/project/xyt/util/ExcelUtil.java

@@ -0,0 +1,109 @@
+package com.gunshi.project.xyt.util;
+
+import cn.hutool.core.collection.CollUtil;
+import cn.hutool.core.io.resource.ClassPathResource;
+import com.alibaba.excel.EasyExcel;
+import com.alibaba.excel.ExcelWriter;
+import com.alibaba.excel.support.ExcelTypeEnum;
+import com.alibaba.excel.write.builder.ExcelWriterSheetBuilder;
+import com.alibaba.excel.write.metadata.WriteSheet;
+import jakarta.servlet.http.HttpServletResponse;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
+import java.util.List;
+import java.util.Map;
+
+public class ExcelUtil {
+
+    /**
+     * 导出excel
+     *
+     * @param list      导出数据集合,加动态表头
+     * @param filename 工作表的名称
+     * @param clazz     实体类
+     * @param response  响应体
+     */
+    public static <T> void exportExcel(List<T> list, String filename, Class<T> clazz, HttpServletResponse response,String sheetName) {
+        OutputStream out = null;
+        try {
+            out = getOutputStream(filename,response);
+            ExcelWriterSheetBuilder builder = EasyExcel.write(out, clazz)
+                    //是否自动关闭流
+                    .autoCloseStream(Boolean.FALSE)
+                    //自动列宽(不太精确)
+                    .registerWriteHandler(new VoteTitleHandler(filename))
+                    .sheet(sheetName);
+            builder.doWrite(list);
+        } finally {
+            try {
+                if (out != null){
+                    out.flush();
+                    out.close();
+                }
+            } catch (IOException e) {
+                throw new RuntimeException("导出Excel异常");
+            }
+        }
+    }
+
+
+
+    /**
+     * 单表多数据模板导出 模板格式为 {.属性}
+     *
+     * @param filename     文件名
+     * @param templatePath 模板路径 resource 目录下的路径包括模板文件名
+     *                     例如: excel/temp.xlsx
+     *                     重点: 模板文件必须放置到启动类对应的 resource 目录下
+     * @param data         模板需要的数据
+     * @param list         模板需要的集合数据
+     */
+    public static <T> void exportTemplate(Map<String, Object> data, List<T> list, String filename, String templatePath, HttpServletResponse response) {
+        OutputStream out = null;
+        try {
+            out = getOutputStream(filename,response);
+            ClassPathResource templateResource = new ClassPathResource(templatePath);
+            ExcelWriter excelWriter =  EasyExcel.write(out)
+                    .withTemplate(templateResource.getStream())
+                    .excelType(ExcelTypeEnum.XLSX)
+                    .build();
+            WriteSheet writeSheet = EasyExcel.writerSheet().build();
+            if (CollUtil.isEmpty(data)) {
+                throw new IllegalArgumentException("数据为空");
+            }
+            excelWriter.fill(list,writeSheet);
+            excelWriter.fill(data, writeSheet);
+            excelWriter.finish();
+        } finally {
+            try {
+                if (out != null){
+                    out.flush();
+                    out.close();
+                }
+            } catch (IOException e) {
+                throw new RuntimeException("导出Excel异常");
+            }
+        }
+    }
+
+    private static OutputStream getOutputStream(String fileName, HttpServletResponse response) {
+        try {
+            fileName = URLEncoder.encode(fileName, StandardCharsets.UTF_8);
+            response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=UTF-8");
+            response.setCharacterEncoding("utf8");
+            response.setHeader("Content-Disposition", "attachment; filename=" + fileName + ".xlsx");
+            response.setHeader("Pragma", "public");
+            response.setHeader("Cache-Control", "no-store");
+            response.addHeader("Cache-Control", "max-age=0");
+            return response.getOutputStream();
+        } catch (IOException e) {
+            System.out.println(e.getMessage());
+        }
+        return null;
+    }
+
+
+}

src/main/java/com/gunshi/project/xyt/util/VoteTitleHandler.java

@@ -0,0 +1,45 @@
+package com.gunshi.project.xyt.util;
+
+import com.alibaba.excel.metadata.Head;
+import com.alibaba.excel.write.handler.CellWriteHandler;
+import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
+import com.alibaba.excel.write.metadata.holder.WriteTableHolder;
+import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
+import org.apache.poi.ss.usermodel.Row;
+import org.springframework.util.PropertyPlaceholderHelper;
+
+import java.util.Date;
+import java.util.List;
+import java.util.Properties;
+
+
+public class VoteTitleHandler implements CellWriteHandler {
+
+      private String title;
+
+      private String describe;
+
+      private Date voteTime;
+
+      PropertyPlaceholderHelper placeholderHelper = new PropertyPlaceholderHelper("${", "}");
+
+      public VoteTitleHandler(String title) {
+            this.title = title;
+      }
+
+      @Override
+      public void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder,
+                                   Row row, Head head, Integer integer, Integer integer1, Boolean aBoolean) {
+            if (head != null) {
+                  List<String> headNameList = head.getHeadNameList();
+                  if (CollectionUtils.isNotEmpty(headNameList)) {
+                        Properties properties = new Properties();
+                        properties.setProperty("title", title);
+                        for (int i = 0; i < headNameList.size(); i++) {
+                              headNameList.set(i, placeholderHelper.replacePlaceholders(headNameList.get(i), properties));
+                        }
+                  }
+            }
+      }
+
+}