註解反射導出Excel自定義中文表頭，數據庫查出數據

註解 ：

import java.lang.annotation.*;
/**
 * @author jly Exce註解
 * @date 2018-11-30
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD})
@Documented
public @interface ExceDataName {
    /**
     * 字段名稱
     * @return
     */
    String name() default "未命名";

}

 要導出vo，

public class OverdueData extends BaseQuery {
    @ExceDataName(name = "註冊時間")
    private String create_time;
    @ExceDataName(name = "用戶來源")
    private String source;
    @ExceDataName(name = "用戶姓名")
    private String real_name;
    @ExceDataName(name = "用戶手機")

反射/導出核心代碼：

/**
     * 導出下載Excel
     *
     * @param response
     * @param fileName  文件名稱
     * @param ExcelName 表名稱
     * @param ts        數據 vo集合
     * @throws Exception
     */
    public static void exportExcel(HttpServletResponse response, String fileName, String ExcelName, List<Object> ts) throws Exception {
        if (!ts.isEmpty()) {//表頭
            Object t = ts.get(0);
            Class cls = t.getClass();
            ExcelData data = new ExcelData();
            data.setName(ExcelName);
            Field[] fieldlist = cls.getDeclaredFields();
            //添加表頭
            List<String> titles = new ArrayList();
            for (int i = 0; i < fieldlist.length; i++) {
                String fieldName = null;
                Field fld = fieldlist[i];
                //打開私有訪問
                fld.setAccessible(true);
                Annotation[] allAnnotations = fld.getAnnotations();
                for (Annotation an : allAnnotations) {//字段上的所有註解，沒有加該註解的字段直接跳過
                    Class annotationType = an.annotationType();
                    ExceDataName name = fld.getAnnotation(ExceDataName.class);
                    if (name != null) {
                        fieldName = name.name();
                    } else {
                        continue;
                    }
                }
                if (null == fieldName) {
                    continue;
                }
                titles.add(fieldName);
            }
            data.setTitles(titles);
            //添加列
            List<List<Object>> rows = new ArrayList();
            for (Object o : ts) {
                Class clss = o.getClass();
                Field[] fieldlists = clss.getDeclaredFields();
                List<Object> row = new ArrayList<>();
                for (int i = 0; i < fieldlists.length; i++) {
                    Field fld = fieldlists[i];
                    //打開私有訪問
                    fld.setAccessible(true);
                    String fieldName = null;
                    //打開私有訪問
                    fld.setAccessible(true);
                    Annotation[] allAnnotations = fld.getAnnotations();
                    for (Annotation an : allAnnotations) {
                        Class annotationType = an.annotationType();
                        ExceDataName name = fld.getAnnotation(ExceDataName.class);
                        if (name != null) {
                            fieldName = name.name();
                        } else {
                            continue;
                        }
                    }
                    if (null == fieldName) {
                        continue;
                    }
                    //獲取屬性值
                    Object value = fld.get(o);
                    row.add(fld.get(o));
                }
                rows.add(row);
            }
            data.setRows(rows);
            SimpleDateFormat fdate = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
            if (null == fileName) {//沒有名稱默認成日期
                fileName = fdate.format(new Date()) + ".xls";
            } else {
                fileName = fileName + ".xls";
            }
            ExportExcelUtils.exportExcel(response, fileName, data);
        }
    }


public static void exportExcel(HttpServletResponse response, String fileName, ExcelData data) throws Exception {
        // 告訴瀏覽器用什麼軟件可以打開此文件
        response.setHeader("content-Type", "application/vnd.ms-excel");
        // 下載文件的默認名稱
        response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "utf-8"));
        exportExcel(data, response.getOutputStream());
    }

    public static void exportExcel(ExcelData data, OutputStream out) throws Exception {

        XSSFWorkbook wb = new XSSFWorkbook();
        try {
            String sheetName = data.getName();
            if (null == sheetName) {
                sheetName = "Sheet1";
            }
            XSSFSheet sheet = wb.createSheet(sheetName);
            writeExcel(wb, sheet, data);

            wb.write(out);
        } finally {
            wb.close();
        }
    }

    private static void writeExcel(XSSFWorkbook wb, Sheet sheet, ExcelData data) {

        int rowIndex = 0;

        rowIndex = writeTitlesToExcel(wb, sheet, data.getTitles());
        writeRowsToExcel(wb, sheet, data.getRows(), rowIndex);
        autoSizeColumns(sheet, data.getTitles().size() + 1);

    }

    private static int writeTitlesToExcel(XSSFWorkbook wb, Sheet sheet, List<String> titles) {
        int rowIndex = 0;
        int colIndex = 0;

        Font titleFont = wb.createFont();
        titleFont.setFontName("simsun");
        titleFont.setBold(true);
        // titleFont.setFontHeightInPoints((short) 14);
        titleFont.setColor(IndexedColors.BLACK.index);

        XSSFCellStyle titleStyle = wb.createCellStyle();
        titleStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
        titleStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
        titleStyle.setFillForegroundColor(new XSSFColor(new Color(182, 184, 192)));
        titleStyle.setFillPattern(XSSFCellStyle.SOLID_FOREGROUND);
        titleStyle.setFont(titleFont);
        setBorder(titleStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));

        Row titleRow = sheet.createRow(rowIndex);
        // titleRow.setHeightInPoints(25);
        colIndex = 0;

        for (String field : titles) {
            Cell cell = titleRow.createCell(colIndex);
            cell.setCellValue(field);
            cell.setCellStyle(titleStyle);
            colIndex++;
        }

        rowIndex++;
        return rowIndex;
    }

    private static int writeRowsToExcel(XSSFWorkbook wb, Sheet sheet, List<List<Object>> rows, int rowIndex) {
        int colIndex = 0;

        Font dataFont = wb.createFont();
        dataFont.setFontName("simsun");
        // dataFont.setFontHeightInPoints((short) 14);
        dataFont.setColor(IndexedColors.BLACK.index);

        XSSFCellStyle dataStyle = wb.createCellStyle();
        dataStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
        dataStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
        dataStyle.setFont(dataFont);
        setBorder(dataStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));

        for (List<Object> rowData : rows) {
            Row dataRow = sheet.createRow(rowIndex);
            // dataRow.setHeightInPoints(25);
            colIndex = 0;

            for (Object cellData : rowData) {
                Cell cell = dataRow.createCell(colIndex);
                if (cellData != null) {
                    cell.setCellValue(cellData.toString());
                } else {
                    cell.setCellValue("");
                }

                cell.setCellStyle(dataStyle);
                colIndex++;
            }
            rowIndex++;
        }
        return rowIndex;
    }
private static void autoSizeColumns(Sheet sheet, int columnNumber) {

        for (int i = 0; i < columnNumber; i++) {
            int orgWidth = sheet.getColumnWidth(i);
            sheet.autoSizeColumn(i, true);
            int newWidth = (int) (sheet.getColumnWidth(i) + 100);
            if (newWidth > orgWidth) {
                sheet.setColumnWidth(i, newWidth);
            } else {
                sheet.setColumnWidth(i, orgWidth);
            }
        }
    }

 private static void setBorder(XSSFCellStyle style, BorderStyle border, XSSFColor color) {
        style.setBorderTop(border);
        style.setBorderLeft(border);
        style.setBorderRight(border);
        style.setBorderBottom(border);
        style.setBorderColor(BorderSide.TOP, color);
        style.setBorderColor(BorderSide.LEFT, color);
        style.setBorderColor(BorderSide.RIGHT, color);
        style.setBorderColor(BorderSide.BOTTOM, color);
    }

 

控制層方法：
數據庫查出要導出的數據---導出
ExportExcelUtils.exportExcel(response, "逾期數據", "逾期數據", queryDataMapper.queryOverdueData(overdueData));

 

 

代碼下載地址：https://download.csdn.net/download/jialiuyang/10821394