工作中经常遇到导出Ecxel功能，这里就给出完整示例代码，可以直接使用。

1.引入依赖

org.apache.poi poi-ooxml 3.17

2. ExcelSheetSettingEnum

定义Excel的一些配置信息

public enum ExcelSheetSettingEnum { REPORT_TEST("report_test", "Excel文件名称", new String[]{"Sheet名称1", "Sheet名称2"}, new String[]{"标题1", "标题2"}, new String[][]{ {"字段名称A", "字段名称B", "字段名称C", "字段名称D"}, {"字段名称A", "字段名称B", "字段名称C", "字段名称D"} }), REPORT_TEST2("report_test2", "Excel文件名称", new String[]{"标题1", "标题2"}), REPORT_TEST3("report_test3", "Excel文件名称") ; ExcelSheetSettingEnum(String code, String filename) { this.code = code; this.filename = filename; } ExcelSheetSettingEnum(String code, String filename, String[] titles) { this.code = code; this.filename = filename; this.titles = titles; } ExcelSheetSettingEnum(String code, String filename, String[] sheetnames, String[] titles, String[][] headers) { this.code = code; this.filename = filename; this.sheetnames = sheetnames; this.titles = titles; this.headers = headers; } /** 代码标识(必选) */ private String code; /** 代码标识(必选) */ private String filename; /** Sheet名称(可选) */ private String[] sheetnames; /** Sheet标题(可选) */ private String[] titles; /** 表头名称(可选) */ private String[][] headers; // Getter & Setter}

3. ExcelView

定义Excel视图，继承自AbstractXlsxView或者AbstractXlsView, 需要实现一个abstract方法buildExcelDocument用于创建Sheet，构造Excel数据。

继承关系如下：

/** * Excel视图 * * 支持多个Sheet, Sheet名称、标题和表头不是必须的 * AbstractPdfView和AbstractXlsxView原理大致相同 *  * @author mengday zhang */public class ExcelView extends AbstractXlsxView { @Override protected void buildExcelDocument(Map map, Workbook workbook, HttpServletRequest request, HttpServletResponse response) throws Exception { ExcelSheetSettingEnum setting = (ExcelSheetSettingEnum) map.get("ExcelSheetSetting"); // 设置文件名称 String filename = setting.getFilename(); filename = new String(filename.getBytes("UTF-8"),"ISO8859-1"); response.setHeader(HttpHeaders.CONTENT_DISPOSITION,"attachment;filename=" + filename + ".xlsx"); List>> sheets = (List>>) map.get("data"); for (int i = 0; i < sheets.size(); i++) { // 创建sheet String[] sheetNames = setting.getSheetnames(); String sheetName = "Sheet" + (i + 1); if (sheetNames != null && sheetNames.length > 0) { sheetName = sheetNames[i]; } Sheet sheet = workbook.createSheet(sheetName); // 如果标题不为空的话，将表格的第一行作为标题行，并合并第一行的N个单元格 int index = 0; String[] titles = setting.getTitles(); String[][] headerss = setting.getHeaders(); List> rowsForTable = sheets.get(i); if (titles != null && titles.length > 0) { // 合并标题单元格 下标从0开始 起始行号，终止行号， 起始列号，终止列号 CellRangeAddress region = new CellRangeAddress(0, 0, 0, rowsForTable.get(0).size() - 1); sheet.addMergedRegion(region); Row titleRow = sheet.createRow(index++); Cell titleCell = titleRow.createCell(0); CellStyle cellStyle = workbook.createCellStyle(); cellStyle.setAlignment(HorizontalAlignment.CENTER); Font font = workbook.createFont(); font.setFontName("黑体"); font.setBold(true); font.setFontHeightInPoints((short) 15); cellStyle.setFont(font); titleCell.setCellStyle(cellStyle); titleCell.setCellValue(titles[i]); } // 创建表头行 if (headerss != null && headerss.length > 0) { Row headerRow = sheet.createRow(index++); String[] headers = headerss[i]; for(int j = 0; j < headers.length; j++) { headerRow.createCell(j).setCellValue(headers[j]); } } // 创建数据行 AtomicInteger rowIndex = new AtomicInteger(index); rowsForTable.forEach(rowList -> { Row row = sheet.createRow(rowIndex.getAndIncrement()); AtomicInteger x = new AtomicInteger(); rowList.forEach(cell -> row.createCell(x.getAndIncrement()).setCellValue(cell) ); }); } }}

4.controller

mvc方法中方法的返回值是ModelAndView, 当代码执行new ModelAndView(excelView, map)时会执行ExcelView#buildExcelDocument的方法

@RestController@RequestMapping("/excel")public class ExcelController { @RequestMapping("/export") public ModelAndView export(){ List> sheet1 = Arrays.asList( Arrays.asList("1", "11", "111", "1111"), Arrays.asList("2", "22", "222", "2222"), Arrays.asList("3", "33", "333", "3333") ); List> sheet2 = Arrays.asList( Arrays.asList("4", "44", "444", "4444"), Arrays.asList("5", "55", "555", "5555"), Arrays.asList("6", "66", "666", "6666") ); List>> sheets = Arrays.asList(sheet1, sheet2); Map map = new HashMap<>(); map.put("ExcelSheetSetting", ExcelSheetSettingEnum.REPORT_TEST2); map.put("data", sheets); ExcelView excelView = new ExcelView(); return new ModelAndView(excelView, map); }}