fix: 增加综合导出工具类
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tangwei
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deac23c517
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521
backend/src/main/java/com/yfd/platform/utils/ExportZipUtil.java
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521
backend/src/main/java/com/yfd/platform/utils/ExportZipUtil.java
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package com.yfd.platform.utils;
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import lombok.AllArgsConstructor;
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import lombok.Data;
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import lombok.NoArgsConstructor;
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import org.apache.poi.ss.usermodel.*;
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import org.apache.poi.xssf.streaming.SXSSFSheet;
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import org.apache.poi.xssf.streaming.SXSSFWorkbook;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import jakarta.servlet.ServletOutputStream;
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import jakarta.servlet.http.HttpServletResponse;
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import java.io.*;
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import java.net.URLEncoder;
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import java.util.*;
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import java.util.function.Function;
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import java.util.stream.Collectors;
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/**
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* 综合导出工具类 — 将多维度数据导出为 ZIP 压缩包，内含若干 Excel (.xlsx) 文件，每个 Excel 支持多 Sheet 页。
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*
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* <h3>使用示例</h3>
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* <pre>{@code
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* // 1. 构建 Sheet 数据
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* SheetData stationSheet = new SheetData("电站基础信息",
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* Arrays.asList("测站编码", "测站名称", "经度", "纬度"),
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* stationRows); // List<List<Object>>
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*
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* SheetData monitorSheet = new SheetData("监测数据",
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* Arrays.asList("时间", "水位", "流量"),
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* monitorRows);
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*
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* // 2. 构建 Excel 数据（一个 Excel = 多个 Sheet）
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* ExcelData excel1 = new ExcelData("电站数据", Arrays.asList(stationSheet, monitorSheet));
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* ExcelData excel2 = new ExcelData("流域数据", Arrays.asList(basinSheet));
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*
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* // 3. 导出到 HttpServletResponse
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* ExportZipUtil.exportToResponse(response, "数据导出_20260731.zip", Arrays.asList(excel1, excel2));
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*
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* // 或导出到文件
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* ExportZipUtil.exportToFile(new File("D:/export.zip"), Arrays.asList(excel1, excel2));
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*
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* // 类型安全的构建方式
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* SheetData sheet = ExportZipUtil.fromTypedData("电站信息",
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* Arrays.asList("编码", "名称", "经度"),
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* Arrays.asList(Station::getStcd, Station::getStnm, Station::getLgtd),
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* stationList);
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* }</pre>
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*
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* @author system
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* @since 2026-07-31
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*/
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public class ExportZipUtil {
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private static final Logger log = LoggerFactory.getLogger(ExportZipUtil.class);
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private ExportZipUtil() {
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// 工具类，禁止实例化
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}
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// ======================== 数据模型 ========================
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/**
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* 单个 Sheet 页数据定义
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*/
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@Data
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@NoArgsConstructor
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@AllArgsConstructor
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public static class SheetData {
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/** Sheet 页名称 */
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private String sheetName;
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/** 表头列名集合 */
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private List<String> headers;
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/** 数据行集合（每行是一个 Object 列表，与 headers 一一对应） */
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private List<List<Object>> rows;
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}
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/**
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* 单个 Excel 文件数据定义（一个 Excel = 多个 Sheet）
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*/
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@Data
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@NoArgsConstructor
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@AllArgsConstructor
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public static class ExcelData {
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/** Excel 文件名（不含 .xlsx 扩展名，在 ZIP 中自动添加） */
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private String fileName;
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/** 该 Excel 包含的所有 Sheet 页 */
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private List<SheetData> sheets;
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}
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// ======================== 核心导出方法 ========================
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/**
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* 导出 ZIP 压缩包到 HttpServletResponse（浏览器下载）
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*
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* @param response HttpServletResponse
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* @param zipFileName 下载文件名（含 .zip 扩展名）
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* @param excelList 要导出的 Excel 数据集合
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*/
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public static void exportToResponse(HttpServletResponse response, String zipFileName, List<ExcelData> excelList) {
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response.setContentType("application/zip");
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response.setCharacterEncoding("UTF-8");
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try {
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response.setHeader("Content-Disposition",
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"attachment; filename=" + URLEncoder.encode(zipFileName, "UTF-8"));
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} catch (UnsupportedEncodingException e) {
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response.setHeader("Content-Disposition", "attachment; filename=export.zip");
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}
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try (ServletOutputStream os = response.getOutputStream()) {
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exportToStream(os, excelList);
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os.flush();
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} catch (IOException e) {
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log.error("导出 ZIP 到 Response 失败", e);
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throw new RuntimeException("导出失败: " + e.getMessage(), e);
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}
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}
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/**
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* 导出 ZIP 压缩包到本地文件
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*
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* @param targetFile 目标文件
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* @param excelList 要导出的 Excel 数据集合
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*/
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public static void exportToFile(File targetFile, List<ExcelData> excelList) {
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try (FileOutputStream fos = new FileOutputStream(targetFile)) {
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exportToStream(fos, excelList);
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} catch (IOException e) {
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log.error("导出 ZIP 到文件失败: {}", targetFile.getAbsolutePath(), e);
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throw new RuntimeException("导出失败: " + e.getMessage(), e);
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}
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}
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/**
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* 导出 ZIP 压缩包到任意 OutputStream
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* <p>
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* 实现原理：先将每个 Excel 写入临时字节数组，再用内存 ZIP 打包，避免磁盘 IO。
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*
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* @param os 目标输出流
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* @param excelList 要导出的 Excel 数据集合
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*/
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public static void exportToStream(OutputStream os, List<ExcelData> excelList) throws IOException {
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if (excelList == null || excelList.isEmpty()) {
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log.warn("导出数据为空，跳过 ZIP 生成");
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return;
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}
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// 延迟创建 ZIP，累计所有 Excel 字节数组
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ByteArrayOutputStream zipBaos = new ByteArrayOutputStream();
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try (java.util.zip.ZipOutputStream zos = new java.util.zip.ZipOutputStream(zipBaos)) {
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for (ExcelData excelData : excelList) {
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if (excelData.getSheets() == null || excelData.getSheets().isEmpty()) {
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continue;
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}
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byte[] excelBytes = workbookToBytes(createWorkbook(excelData));
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String entryName = sanitizeFileName(excelData.getFileName()) + ".xlsx";
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java.util.zip.ZipEntry entry = new java.util.zip.ZipEntry(entryName);
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zos.putNextEntry(entry);
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zos.write(excelBytes);
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zos.closeEntry();
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}
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zos.finish();
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}
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os.write(zipBaos.toByteArray());
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}
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// ======================== Excel 生成方法 ========================
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/**
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* 根据 ExcelData 创建一个完整的 Excel Workbook（含所有 Sheet）
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* <p>
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* 使用 SXSSFWorkbook（流式写入），支持大数据量导出，内存占用可控。
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*
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* @param excelData 单个 Excel 的数据定义
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* @return 填充完毕的 Workbook（调用方负责关闭以释放临时文件）
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*/
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public static Workbook createWorkbook(ExcelData excelData) {
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SXSSFWorkbook workbook = new SXSSFWorkbook(100); // 内存中保留 100 行，其余写临时文件
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CellStyle headerStyle = createHeaderStyle(workbook);
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CellStyle dataStyle = createDataStyle(workbook);
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for (SheetData sheetData : excelData.getSheets()) {
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if (sheetData == null) {
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continue;
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}
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fillSheet(workbook, sheetData, headerStyle, dataStyle);
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}
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return workbook;
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}
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/**
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* 填充单个 Sheet 页的数据
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*
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* @param workbook 目标 Workbook
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* @param sheetData Sheet 数据定义
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* @param headerStyle 表头样式
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* @param dataStyle 数据行样式
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*/
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public static void fillSheet(Workbook workbook, SheetData sheetData, CellStyle headerStyle, CellStyle dataStyle) {
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String name = safeName(sheetData.getSheetName());
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Sheet sheet = workbook.createSheet(name);
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// SXSSFSheet 必须在写入数据前开启列追踪，否则 autoSizeColumn 会报错
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if (sheet instanceof SXSSFSheet) {
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((SXSSFSheet) sheet).trackAllColumnsForAutoSizing();
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}
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List<String> headers = sheetData.getHeaders();
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List<List<Object>> rows = sheetData.getRows();
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int colCount = headers != null ? headers.size() : 0;
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// 设置列宽默认值（后续在数据写入后统一自动调整）
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int currentRow = 0;
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// ---- 写表头 ----
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if (headers != null && !headers.isEmpty()) {
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Row headerRow = sheet.createRow(currentRow++);
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headerRow.setHeightInPoints(22);
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for (int i = 0; i < colCount; i++) {
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Cell cell = headerRow.createCell(i);
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cell.setCellValue(headers.get(i));
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cell.setCellStyle(headerStyle);
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}
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}
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// ---- 写数据行 ----
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if (rows != null) {
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for (List<Object> rowData : rows) {
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Row dataRow = sheet.createRow(currentRow++);
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for (int i = 0; i < Math.min(rowData.size(), colCount); i++) {
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Cell cell = dataRow.createCell(i);
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Object value = rowData.get(i);
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setCellValue(cell, value);
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cell.setCellStyle(dataStyle);
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}
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}
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}
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// ---- 自动调整列宽 ----
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autoSizeColumns(sheet, colCount);
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// 冻结首行（表头固定）
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if (currentRow > 1) {
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sheet.createFreezePane(0, 1);
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}
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}
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// ======================== 样式定义 ========================
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/**
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* 创建表头样式（蓝色背景、白色加粗字体、居中对齐、带边框）
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*/
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public static CellStyle createHeaderStyle(Workbook workbook) {
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CellStyle style = workbook.createCellStyle();
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// 背景色：深蓝
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style.setFillForegroundColor(IndexedColors.ROYAL_BLUE.getIndex());
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style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
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// 字体：白色加粗
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Font font = workbook.createFont();
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font.setBold(true);
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font.setColor(IndexedColors.WHITE.getIndex());
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font.setFontHeightInPoints((short) 11);
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style.setFont(font);
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// 对齐：居中
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style.setAlignment(HorizontalAlignment.CENTER);
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style.setVerticalAlignment(VerticalAlignment.CENTER);
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// 边框
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setThinBorder(style);
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return style;
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}
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/**
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* 创建数据行样式（无背景、正常字体、左对齐、带边框）
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*/
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public static CellStyle createDataStyle(Workbook workbook) {
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CellStyle style = workbook.createCellStyle();
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style.setAlignment(HorizontalAlignment.LEFT);
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style.setVerticalAlignment(VerticalAlignment.CENTER);
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// 自动换行
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style.setWrapText(true);
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setThinBorder(style);
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return style;
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}
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/**
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* 设置细线边框
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*/
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private static void setThinBorder(CellStyle style) {
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style.setBorderTop(BorderStyle.THIN);
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style.setBorderRight(BorderStyle.THIN);
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style.setBorderBottom(BorderStyle.THIN);
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style.setBorderLeft(BorderStyle.THIN);
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}
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// ======================== 列宽自动调整 ========================
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/**
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* 自动调整列宽（根据内容宽度）
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* <p>
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* 遍历每一列，取表头和所有数据行中最宽的内容作为列宽基准。
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*
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* @param sheet Sheet 对象
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* @param colCount 列数
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*/
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public static void autoSizeColumns(Sheet sheet, int colCount) {
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for (int i = 0; i < colCount; i++) {
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sheet.autoSizeColumn(i);
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// 自动列宽后留一点余量，避免内容紧贴边框
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int currentWidth = sheet.getColumnWidth(i);
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if (currentWidth > 0) {
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sheet.setColumnWidth(i, Math.min(currentWidth + 512, 255 * 256)); // 最大 255 字符宽
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}
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}
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}
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// ======================== 辅助方法 ========================
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/**
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* 类型安全方式构建 SheetData
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* <p>
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* 适用于已有实体类 List 的场景，通过方法引用指定字段取值，避免手动逐字段提取。
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*
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* <pre>{@code
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* SheetData data = ExportZipUtil.fromTypedData("电站信息",
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* Arrays.asList("编码", "名称", "经度", "纬度"),
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* Arrays.asList(Station::getStcd, Station::getStnm, Station::getLgtd, Station::getLttd),
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* stationList);
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* }</pre>
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*
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* @param sheetName Sheet 名称
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* @param headers 表头列表
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* @param extractors 字段取值函数（与 headers 一一对应）
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* @param data 实体数据集合
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* @param <T> 实体类型
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* @return 构建好的 SheetData
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*/
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public static <T> SheetData fromTypedData(String sheetName,
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List<String> headers,
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List<Function<T, Object>> extractors,
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List<T> data) {
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List<List<Object>> rows = data.stream()
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.map(entity -> extractors.stream()
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.map(ext -> ext.apply(entity))
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.collect(Collectors.toList()))
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.collect(Collectors.toList());
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return new SheetData(sheetName, headers, rows);
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}
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/**
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* 将 Workbook 写入字节数组并关闭 Workbook
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*/
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private static byte[] workbookToBytes(Workbook workbook) throws IOException {
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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try {
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workbook.write(baos);
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} finally {
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workbook.close();
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// SXSSFWorkbook 会清理临时文件
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if (workbook instanceof SXSSFWorkbook) {
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((SXSSFWorkbook) workbook).dispose();
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}
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}
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return baos.toByteArray();
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}
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/**
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* 文件名非法字符过滤（Windows + 通用）
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*/
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private static String sanitizeFileName(String fileName) {
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if (fileName == null || fileName.isEmpty()) {
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return "sheet";
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}
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return fileName.replaceAll("[\\\\/:*?\"<>|]", "_");
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}
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/**
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* Sheet 名称安全处理（Excel Sheet 名最长 31 字符）
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*/
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private static String safeName(String name) {
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if (name == null || name.isEmpty()) {
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return "Sheet1";
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}
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// Excel Sheet 名禁止包含 [ ] : * ? / \
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String safe = name.replaceAll("[\\[\\]:*?/\\\\]", "_");
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return safe.length() > 31 ? safe.substring(0, 31) : safe;
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}
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/**
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* 设置单元格值（自动适配类型）
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*/
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private static void setCellValue(Cell cell, Object value) {
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if (value == null) {
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cell.setCellValue("");
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} else if (value instanceof Number) {
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cell.setCellValue(((Number) value).doubleValue());
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} else if (value instanceof Boolean) {
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cell.setCellValue((Boolean) value);
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} else if (value instanceof java.util.Date) {
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cell.setCellValue((java.util.Date) value);
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} else {
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cell.setCellValue(String.valueOf(value));
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}
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}
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// ======================== 测试方法 ========================
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/**
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* 本地运行测试，生成模拟数据 ZIP 文件到 D:/export_sample.zip
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*/
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public static void main(String[] args) {
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// ---------- Excel 1：电站基础数据（1个Sheet：基础信息） ----------
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List<List<Object>> stationRows = new ArrayList<>();
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for (int i = 1; i <= 50; i++) {
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stationRows.add(Arrays.asList(
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"STCD" + String.format("%05d", i), // 测站编码
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"XX水电站" + i + "号", // 测站名称
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"长江流域", // 所在流域
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110.123456 + Math.random() * 10, // 经度
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30.654321 + Math.random() * 10, // 纬度
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"坝式水电站", // 工程类型
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Math.random() > 0.5 ? "运行中" : "在建", // 建设状态
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"省级", // 级别
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2000 + (i % 24) // 建成时间
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));
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}
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SheetData stationSheet = new SheetData("电站基础信息",
|
||||
Arrays.asList("测站编码", "测站名称", "所在流域", "经度", "纬度",
|
||||
"工程类型", "建设状态", "级别", "建成时间"),
|
||||
stationRows);
|
||||
|
||||
// ---------- Sheet 2：水位监测数据 ----------
|
||||
List<List<Object>> monitorRows = new ArrayList<>();
|
||||
String[] months = {"2026-01", "2026-02", "2026-03", "2026-04", "2026-05", "2026-06"};
|
||||
for (int i = 1; i <= 30; i++) {
|
||||
for (String month : months) {
|
||||
monitorRows.add(Arrays.asList(
|
||||
"STCD" + String.format("%05d", i),
|
||||
"XX水电站" + i + "号",
|
||||
month,
|
||||
String.format("%.2f", 100 + Math.random() * 50), // 水位(m)
|
||||
String.format("%.2f", 500 + Math.random() * 2000), // 流量(m³/s)
|
||||
String.format("%.1f", 15 + Math.random() * 20), // 水温(℃)
|
||||
Math.random() > 0.8 ? "超标" : "正常" // 水质状态
|
||||
));
|
||||
}
|
||||
}
|
||||
SheetData monitorSheet = new SheetData("水位监测数据",
|
||||
Arrays.asList("测站编码", "测站名称", "监测月份", "水位(m)", "流量(m³/s)",
|
||||
"水温(℃)", "水质状态"),
|
||||
monitorRows);
|
||||
|
||||
// ---------- Excel 2：流域概况数据 ----------
|
||||
List<List<Object>> basinRows = new ArrayList<>();
|
||||
String[] basinNames = {"长江流域", "黄河流域", "珠江流域", "淮河流域", "松花江流域", "海河流域"};
|
||||
String[] provinces = {"湖北/湖南/四川", "河南/山东/陕西", "广东/广西", "安徽/江苏", "黑龙江/吉林", "河北/天津"};
|
||||
for (int i = 0; i < basinNames.length; i++) {
|
||||
basinRows.add(Arrays.asList(
|
||||
"RV" + String.format("%03d", i + 1), // 流域编码
|
||||
basinNames[i], // 流域名称
|
||||
i == 0 ? "一级" : "二级", // 级别
|
||||
provinces[i], // 覆盖省份
|
||||
100 + Math.random() * 900, // 流域面积(万km²)
|
||||
500 + Math.random() * 5000, // 年径流量(亿m³)
|
||||
(int) (1000 + Math.random() * 2000), // 电站数量
|
||||
"良好" // 生态状态
|
||||
));
|
||||
}
|
||||
SheetData basinSheet = new SheetData("流域概况",
|
||||
Arrays.asList("流域编码", "流域名称", "级别", "覆盖省份", "流域面积(万km²)",
|
||||
"年径流量(亿m³)", "电站数量(个)", "生态状态"),
|
||||
basinRows);
|
||||
|
||||
// ---------- Sheet 4：鱼道设施数据 ----------
|
||||
List<List<Object>> fishwayRows = new ArrayList<>();
|
||||
String[] types = {"竖缝式鱼道", "池堰式鱼道", "升鱼机", "集运鱼船"};
|
||||
for (int i = 1; i <= 20; i++) {
|
||||
fishwayRows.add(Arrays.asList(
|
||||
"STCD" + String.format("%05d", i),
|
||||
"XX水电站" + i + "号",
|
||||
types[i % types.length], // 鱼道类型
|
||||
String.format("%.1f", 5 + Math.random() * 95), // 过鱼效率(%)
|
||||
String.format("%.2f", 50 + Math.random() * 200), // 鱼道长度(m)
|
||||
String.format("%.1f", 2 + Math.random() * 8), // 鱼道宽度(m)
|
||||
Math.random() > 0.3 ? "运行中" : "检修中", // 运行状态
|
||||
"2025-0" + (1 + i % 9) + "-01" // 投运日期
|
||||
));
|
||||
}
|
||||
SheetData fishwaySheet = new SheetData("鱼道设施",
|
||||
Arrays.asList("电站编码", "电站名称", "鱼道类型", "过鱼效率(%)",
|
||||
"鱼道长度(m)", "鱼道宽度(m)", "运行状态", "投运日期"),
|
||||
fishwayRows);
|
||||
|
||||
// ---------- 组装导出 ----------
|
||||
ExcelData excel1 = new ExcelData("电站综合数据", Arrays.asList(stationSheet, monitorSheet));
|
||||
ExcelData excel2 = new ExcelData("流域与鱼道数据", Arrays.asList(basinSheet, fishwaySheet));
|
||||
|
||||
String outputPath = "D:/export_sample.zip";
|
||||
try {
|
||||
log.info("开始生成测试数据...");
|
||||
exportToFile(new File(outputPath), Arrays.asList(excel1, excel2));
|
||||
log.info("导出成功！文件路径: {}", outputPath);
|
||||
System.out.println("导出成功！文件路径: " + outputPath);
|
||||
} catch (Exception e) {
|
||||
log.error("导出失败", e);
|
||||
System.err.println("导出失败: " + e.getMessage());
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user