• java 通用导出接口


    每个功能导出文件都单独写接口太过繁琐,出于方便大致讲讲通用导出功能的实现。

    导出文件配置表,该表保存导出dto和导出文件名的对应关系等信息:

    @TableName(value = "SIMPLE_COMMON_EXPORT_TAB")
    public class SimpleCommonExportTab extends BaseEntity {
    
        /**
         *
         */
        @TableId(value = "ID")
        private String id;
    
    
        /**
         *
         */
        @TableField(value = "DTO_NAME")
        private String dtoName;
    
        /**
         *
         */
        @TableField(value = "TITLE")
        private String title;
    
        /**
         *
         */
        @TableField(value = "EXCEL_NAME")
        private String excelName;
    
        /**
         *扩展1
         */
        @TableField(value = "EXPAND1")
        private String expand1;
    
        /**
         *扩展2
         */
        @TableField(value = "EXPAND2")
        private String expand2;
    
        /**
         *扩展3
         */
        @TableField(value = "EXPAND3")
        private String expand3;
    
        public String getId() {
            return id;
        }
    
        public void setId(String id) {
            this.id = id;
        }
    
        public String getDtoName() {
            return dtoName;
        }
    
        public void setDtoName(String dtoName) {
            this.dtoName = dtoName;
        }
    
        public String getTitle() {
            return title;
        }
    
        public void setTitle(String title) {
            this.title = title;
        }
    
        public String getExcelName() {
            return excelName;
        }
    
        public void setExcelName(String excelName) {
            this.excelName = excelName;
        }
    
        public String getExpand1() {
            return expand1;
        }
    
        public void setExpand1(String expand1) {
            this.expand1 = expand1;
        }
    
        public String getExpand2() {
            return expand2;
        }
    
        public void setExpand2(String expand2) {
            this.expand2 = expand2;
        }
    
        public String getExpand3() {
            return expand3;
        }
    
        public void setExpand3(String expand3) {
            this.expand3 = expand3;
        }
    
        @Override
        public String toString() {
            return "SimpleCommonExportTab{" +
                    "id='" + id + '\'' +
                    ", dtoName='" + dtoName + '\'' +
                    ", title='" + title + '\'' +
                    ", excelName='" + excelName + '\'' +
                    ", expand1='" + expand1 + '\'' +
                    ", expand2='" + expand2 + '\'' +
                    ", expand3='" + expand3 + '\'' +
                    '}';
        }
    
        @Override
        protected Serializable pkVal() {
            return this.id;
        }
    }
    
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    示例数据:
    在这里插入图片描述

    CommonAttachFile 文件类,一般文件上传或下载均会在该表生成一条记录:

    @TableName(value = "COMMON_ATTACH_FILE")
    public class CommonAttachFile extends BaseEntity {
        /**
         * 主键
         */
        @TableId(value = "ID")
        private String id;
    
        /***
         * 模块
         */
        @TableField(value = "MODULE")
        private String module;
    
        /**
         * 附件名称
         */
        @TableField(value = "FILE_NAME")
        private String fileName;
    
        /**
         * 附件路径
         */
        @TableField(value = "FILE_PATH")
        private String filePath;
    
    
        /**
         * 附件大小
         */
        @TableField(value = "FILE_SIZE")
        private String fileSize;
    
        /**
         * 附件类型
         */
        @TableField(value = "FILE_TYPE")
        private String fileType;
    
        /**
         * 关联附件的主键
         */
        @TableField(value = "COMMON_ID")
        private String commonId;
    
        /**
         * 附件所属表类型
         */
        @TableField(value = "COMMON_TYPE")
        private String commonType;
    
        /**
         * 备注
         */
        @TableField(value = "REMARK")
        private String remark;
    
        public CommonAttachFile() {
        }
    
        public CommonAttachFile(String fileName, String filePath, String fileSize, String fileType) {
            this.fileName = fileName;
            this.filePath = filePath;
            this.fileSize = fileSize;
            this.fileType = fileType;
        }
    
        public String getId() {
            return id;
        }
    
        public void setId(String id) {
            this.id = id;
        }
    
        public String getFileName() {
            return fileName;
        }
    
        public void setFileName(String fileName) {
            this.fileName = fileName;
        }
    
        public String getFilePath() {
            return filePath;
        }
    
        public void setFilePath(String filePath) {
            this.filePath = filePath;
        }
    
        public String getFileSize() {
            return fileSize;
        }
    
        public void setFileSize(String fileSize) {
            this.fileSize = fileSize;
        }
    
        public String getFileType() {
            return fileType;
        }
    
        public void setFileType(String fileType) {
            this.fileType = fileType;
        }
    
        public String getCommonId() {
            return commonId;
        }
    
        public void setCommonId(String commonId) {
            this.commonId = commonId;
        }
    
        public String getCommonType() {
            return commonType;
        }
    
        public void setCommonType(String commonType) {
            this.commonType = commonType;
        }
    
        public String getRemark() {
            return remark;
        }
    
        public void setRemark(String remark) {
            this.remark = remark;
        }
    
        public String getModule() {
            return module;
        }
    
        public void setModule(String module) {
            this.module = module;
        }
    
        @Override
        public String toString() {
            return "CommonAttachFile{" +
                    "id='" + id + '\'' +
                    ", fileName='" + fileName + '\'' +
                    ", filePath='" + filePath + '\'' +
                    ", fileSize='" + fileSize + '\'' +
                    ", fileType='" + fileType + '\'' +
                    ", commonId='" + commonId + '\'' +
                    ", commonType='" + commonType + '\'' +
                    ", remark='" + remark + '\'' +
                    '}';
        }
    
        @Override
        protected Serializable pkVal() {
            return this.id;
        }
    
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    ExportExcel类:

    public class ExportExcel {
    
        private static Logger log = LoggerFactory.getLogger(ExportExcel.class);
    
        /**
         * 工作薄对象
         */
        private SXSSFWorkbook wb;
    
        /**
         * 工作表对象
         */
        private Sheet sheet;
    
        /**
         * 样式列表
         */
        private Map styles;
    
        /**
         * 当前行号
         */
        private int rownum;
    
        /**
         * 注解列表(Object[]{ ExcelField, Field/Method })
         */
        List annotationList = Lists.newArrayList();
    
        /**
         * 构造函数
         *
         * @param title 表格标题,传“空值”,表示无标题
         * @param cls   实体对象,通过annotation.ExportField获取标题
         */
        public ExportExcel(String title, Class cls) {
            this(title, cls, 1);
        }
    
        /**
         * 构造函数
         *
         * @param title  表格标题,传“空值”,表示无标题
         * @param cls    实体对象,通过annotation.ExportField获取标题
         * @param type   导出类型(1:导出数据;2:导出模板)
         * @param groups 导入分组
         */
        public ExportExcel(String title, Class cls, int type, int... groups) {
            // Get annotation field
            Field[] fs = cls.getDeclaredFields();
            for (Field f : fs) {
                ExcelField ef = f.getAnnotation(ExcelField.class);
                if (ef != null && (ef.type() == 0 || ef.type() == type)) {
                    if (groups != null && groups.length > 0) {
                        boolean inGroup = false;
                        for (int g : groups) {
                            if (inGroup) {
                                break;
                            }
                            for (int efg : ef.groups()) {
                                if (g == efg) {
                                    inGroup = true;
                                    annotationList.add(new Object[]{ef, f});
                                    break;
                                }
                            }
                        }
                    } else {
                        annotationList.add(new Object[]{ef, f});
                    }
                }
            }
            // Get annotation method
            Method[] ms = cls.getDeclaredMethods();
            for (Method m : ms) {
                ExcelField ef = m.getAnnotation(ExcelField.class);
                if (ef != null && (ef.type() == 0 || ef.type() == type)) {
                    if (groups != null && groups.length > 0) {
                        boolean inGroup = false;
                        for (int g : groups) {
                            if (inGroup) {
                                break;
                            }
                            for (int efg : ef.groups()) {
                                if (g == efg) {
                                    inGroup = true;
                                    annotationList.add(new Object[]{ef, m});
                                    break;
                                }
                            }
                        }
                    } else {
                        annotationList.add(new Object[]{ef, m});
                    }
                }
            }
            // Field sorting
            Collections.sort(annotationList, new Comparator() {
                public int compare(Object[] o1, Object[] o2) {
                    return new Integer(((ExcelField) o1[0]).sort()).compareTo(
                            new Integer(((ExcelField) o2[0]).sort()));
                }
    
                ;
            });
            // Initialize
            List headerList = Lists.newArrayList();
            for (Object[] os : annotationList) {
                String t = ((ExcelField) os[0]).title();
                // 如果是导出,则去掉注释
                if (type == 1) {
                    String[] ss = StringUtils.split(t, "**", 2);
                    if (ss.length == 2) {
                        t = ss[0];
                    }
                }
                headerList.add(t);
            }
            initialize(title, headerList);
        }
    
        /**
         * 构造函数
         *
         * @param title   表格标题,传“空值”,表示无标题
         * @param headers 表头数组
         */
        public ExportExcel(String title, String[] headers) {
            initialize(title, Lists.newArrayList(headers));
        }
    
        /**
         * 构造函数
         *
         * @param title      表格标题,传“空值”,表示无标题
         * @param headerList 表头列表
         */
        public ExportExcel(String title, List headerList) {
            initialize(title, headerList);
        }
    
        /**
         * 初始化函数
         *
         * @param title      表格标题,传“空值”,表示无标题
         * @param headerList 表头列表
         */
        private void initialize(String title, List headerList) {
            this.wb = new SXSSFWorkbook(500);
            this.sheet = wb.createSheet("Export");
            this.styles = createStyles(wb);
            // Create title
            if (StringUtils.isNotBlank(title)) {
                Row titleRow = sheet.createRow(rownum++);
                titleRow.setHeightInPoints(30);
                Cell titleCell = titleRow.createCell(0);
                titleCell.setCellStyle(styles.get("title"));
                titleCell.setCellValue(title);
                sheet.addMergedRegion(new CellRangeAddress(titleRow.getRowNum(),
                        titleRow.getRowNum(), titleRow.getRowNum(), headerList.size() - 1));
            }
            // Create header
            if (headerList == null) {
                throw new RuntimeException("headerList not null!");
            }
            Row headerRow = sheet.createRow(rownum++);
            headerRow.setHeightInPoints(16);
            for (int i = 0; i < headerList.size(); i++) {
                Cell cell = headerRow.createCell(i);
                cell.setCellStyle(styles.get("header"));
                String[] ss = StringUtils.split(headerList.get(i), "**", 2);
                if (ss.length == 2) {
                    cell.setCellValue(ss[0]);
                    Comment comment = this.sheet.createDrawingPatriarch().createCellComment(
                            new XSSFClientAnchor(0, 0, 0, 0, (short) 3, 3, (short) 5, 6));
                    comment.setString(new XSSFRichTextString(ss[1]));
                    cell.setCellComment(comment);
                } else {
                    cell.setCellValue(headerList.get(i));
                }
                sheet.autoSizeColumn(i);
            }
            for (int i = 0; i < headerList.size(); i++) {
                int colWidth = sheet.getColumnWidth(i) * 2;
                sheet.setColumnWidth(i, colWidth < 3000 ? 3000 : colWidth);
            }
            log.debug("Initialize success.");
        }
    
        /**
         * 创建表格样式
         *
         * @param wb 工作薄对象
         * @return 样式列表
         */
        private Map createStyles(Workbook wb) {
            Map styles = new HashMap();
    
            CellStyle style = wb.createCellStyle();
            style.setAlignment(CellStyle.ALIGN_CENTER);
            style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
            Font titleFont = wb.createFont();
            titleFont.setFontName("Arial");
            titleFont.setFontHeightInPoints((short) 16);
            titleFont.setBoldweight(Font.BOLDWEIGHT_BOLD);
            style.setFont(titleFont);
            styles.put("title", style);
    
            style = wb.createCellStyle();
            style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
            style.setBorderRight(CellStyle.BORDER_THIN);
            style.setRightBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
            style.setBorderLeft(CellStyle.BORDER_THIN);
            style.setLeftBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
            style.setBorderTop(CellStyle.BORDER_THIN);
            style.setTopBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
            style.setBorderBottom(CellStyle.BORDER_THIN);
            style.setBottomBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
            Font dataFont = wb.createFont();
            dataFont.setFontName("Arial");
            dataFont.setFontHeightInPoints((short) 10);
            style.setFont(dataFont);
            styles.put("data", style);
    
            style = wb.createCellStyle();
            style.cloneStyleFrom(styles.get("data"));
            style.setAlignment(CellStyle.ALIGN_LEFT);
            styles.put("data1", style);
    
            style = wb.createCellStyle();
            style.cloneStyleFrom(styles.get("data"));
            style.setAlignment(CellStyle.ALIGN_CENTER);
            styles.put("data2", style);
    
            style = wb.createCellStyle();
            style.cloneStyleFrom(styles.get("data"));
            style.setAlignment(CellStyle.ALIGN_RIGHT);
            styles.put("data3", style);
    
            style = wb.createCellStyle();
            style.cloneStyleFrom(styles.get("data"));
    //		style.setWrapText(true);
            style.setAlignment(CellStyle.ALIGN_CENTER);
            style.setFillForegroundColor(IndexedColors.GREY_50_PERCENT.getIndex());
            style.setFillPattern(CellStyle.SOLID_FOREGROUND);
            Font headerFont = wb.createFont();
            headerFont.setFontName("Arial");
            headerFont.setFontHeightInPoints((short) 10);
            headerFont.setBoldweight(Font.BOLDWEIGHT_BOLD);
            headerFont.setColor(IndexedColors.WHITE.getIndex());
            style.setFont(headerFont);
            styles.put("header", style);
    
            return styles;
        }
    
        /**
         * 添加一行
         *
         * @return 行对象
         */
        public Row addRow() {
            return sheet.createRow(rownum++);
        }
    
    
        /**
         * 添加一个单元格
         *
         * @param row    添加的行
         * @param column 添加列号
         * @param val    添加值
         * @return 单元格对象
         */
        public Cell addCell(Row row, int column, Object val) {
            return this.addCell(row, column, val, 0, Class.class);
        }
    
        /**
         * 添加一个单元格
         *
         * @param row    添加的行
         * @param column 添加列号
         * @param val    添加值
         * @param align  对齐方式(1:靠左;2:居中;3:靠右)
         * @return 单元格对象
         */
        public Cell addCell(Row row, int column, Object val, int align, Class fieldType) {
            Cell cell = row.createCell(column);
            String cellFormatString = "@";
            try {
                if (val == null) {
                    cell.setCellValue("");
                } else if (fieldType != Class.class) {
                    cell.setCellValue((String) fieldType.getMethod("setValue", Object.class).invoke(null, val));
                } else {
                    if (val instanceof String) {
                        cell.setCellValue((String) val);
                    } else if (val instanceof Integer) {
                        cell.setCellValue((Integer) val);
                        cellFormatString = "0";
                    } else if (val instanceof Long) {
                        cell.setCellValue((Long) val);
                        cellFormatString = "0";
                    } else if (val instanceof Double) {
                        cell.setCellValue((Double) val);
                        cellFormatString = "0.00";
                    } else if (val instanceof Float) {
                        cell.setCellValue((Float) val);
                        cellFormatString = "0.00";
                    } else if (val instanceof Date) {
                        cell.setCellValue((Date) val);
                        cellFormatString = "yyyy-MM-dd HH:mm";
                    } else {
                        cell.setCellValue((String) Class.forName(this.getClass().getName().replaceAll(this.getClass().getSimpleName(),
                                "fieldtype." + val.getClass().getSimpleName() + "Type")).getMethod("setValue", Object.class).invoke(null, val));
                    }
                }
                if (val != null) {
                    CellStyle style = styles.get("data_column_" + column);
                    if (style == null) {
                        style = wb.createCellStyle();
                        style.cloneStyleFrom(styles.get("data" + (align >= 1 && align <= 3 ? align : "")));
                        style.setDataFormat(wb.createDataFormat().getFormat(cellFormatString));
                        styles.put("data_column_" + column, style);
                    }
                    cell.setCellStyle(style);
                }
            } catch (Exception ex) {
                log.info("Set cell value [" + row.getRowNum() + "," + column + "] error: " + ex.toString());
                if (val != null) {
                    cell.setCellValue(val.toString());
                }
            }
            return cell;
        }
    
        /**
         * 添加数据(通过annotation.ExportField添加数据)
         *
         * @return list 数据列表
         */
        public  ExportExcel setDataList(List list) {
            for (E e : list) {
                int colunm = 0;
                Row row = this.addRow();
                StringBuilder sb = new StringBuilder();
                for (Object[] os : annotationList) {
                    ExcelField ef = (ExcelField) os[0];
                    Object val = null;
                    // Get entity value
                    try {
                        if (StringUtils.isNotBlank(ef.value())) {
                            val = Reflections.invokeGetter(e, ef.value());
                        } else {
                            if (os[1] instanceof Field) {
                                val = Reflections.invokeGetter(e, ((Field) os[1]).getName());
                            } else if (os[1] instanceof Method) {
                                val = Reflections.invokeMethod(e, ((Method) os[1]).getName(), new Class[]{}, new Object[]{});
                            }
                        }
                        // If is dict, get dict label
                        //todo 现在没有字典工具类
    //                    if (StringUtils.isNotBlank(ef.dictType())) {
    //                        val = DictUtils.getDictLabel(val == null ? "" : val.toString(), ef.dictType(), "");
    //                    }
                    } catch (Exception ex) {
                        // Failure to ignore
                        log.info(ex.toString());
                        val = "";
                    }
                    this.addCell(row, colunm++, val, ef.align(), ef.fieldType());
                    sb.append(val + ", ");
                }
                log.debug("Write success: [" + row.getRowNum() + "] " + sb.toString());
            }
            return this;
        }
    
        /**
         * 输出数据流
         *
         * @param os 输出数据流
         */
        public ExportExcel write(OutputStream os) throws IOException {
            wb.write(os);
            return this;
        }
    
        /**
         * 输出到客户端
         *
         * @param fileName 输出文件名
         */
        public ExportExcel write(HttpServletResponse response, String fileName) throws Exception {
            response.reset();
            response.setContentType("application/octet-stream; charset=utf-8");
            response.setHeader("Content-Disposition", "attachment; filename=" + Encodes.urlEncode(fileName));
            write(response.getOutputStream());
            return this;
        }
    
        /**
         * 输出到文件
         *
         * @param name 输出文件名
         */
        public ExportExcel writeFile(String name) throws FileNotFoundException, IOException {
            FileOutputStream os = new FileOutputStream(name);
            this.write(os);
            return this;
        }
    
        /**
         * 清理临时文件
         */
        public ExportExcel dispose() {
            wb.dispose();
            return this;
        }
    
    
    }
    
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    接下来讲讲通用导出接口的具体实现,传入参数为tabId。本项目为微服务架构,当tabId=5时,先去对应服务将要导出的数据查询出来,然后导出。

    具体导出通用接口:

    	@PostMapping(value = "commonExport/exportFileByParams")
        public Result commonExportFileByParams(@RequestParam Map params) {
            //第一步:根据类型或者表名判断是哪个列表的导出,调用服务查询数据( todo 此处自行根据类型扩展)
            CommonAttachFile dataFile = null;
            if (params != null) {
                String type = String.valueOf(params.get("tabId"));
                // 获取登录用户
                String userId = UserUtils.getUserInfo().getLoginName();
                //根据传入参数tabId决定导出某个文件
                SimpleCommonExportTab simpleCommonExportTab = simpleCommonExportTabService.selectById(type);
                switch (type) {
                    case "5":
                        Result> priceNoticeExportDtos = quotationsManageClient.getPriceNoticeListDtos(params);
                        if (CommonConstant.SUCCESS_CODE == priceNoticeExportDtos.getCode() && priceNoticeExportDtos.getData() != null && priceNoticeExportDtos.getData().size() > 0) {
                            ExportDto dto = new ExportDto();
                            dto.setPriceNoticeDtos(priceNoticeExportDtos.getData());
                            dataFile = listNewExport(simpleCommonExportTab, dto, type, PriceNoticeExportDto.class);
                        }
                        break;
                        /***
                        ,,,
                        ***/
                        default:
                }
            }
            return Res.makeOKRsp(dataFile);
        }
    
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    listNewExport()方法:

    private CommonAttachFile listNewExport(SimpleCommonExportTab simpleCommonExportTab, ExportDto dto, String dataId, Class cls) {
            CommonAttachFile dataFile = null;
            //存储的附件名称
            String fileName = DateUtils.getNowTimes() + ".xlsx";
            String path = "export/" + fileName;
            try {
                String filePath = Export + File.separator + path;
                ExportExcel exportExcel = new ExportExcel(simpleCommonExportTab.getTitle(), cls);
                switch (dataId) {
                    case "5":
                        //价格通知列表导出
                        exportExcel.setDataList(dto.getPriceNoticeDtos());
                        break;
                    case "6":
                        //价格查询列表
                        exportExcel.setDataList(dto.getPriceAllNoticeDtos());
                        break;
                    
                    case "50":
                        // 询报价清单导出
                        exportExcel.setDataList(dto.getRequestForQuotationsMainDtoList());
                        break;
                    default:
                }
                FileUtils.createDirectory(Export + File.separator + "export/");
                exportExcel.writeFile(filePath);
                dataFile = new CommonAttachFile(simpleCommonExportTab.getExcelName(),
                        path, "", ".xlsx");
                dataFile.setModule("export");
                dataFile.setCommonType("export");
                commonAttachFileService.save(dataFile);
                return dataFile;
            } catch (Exception e) {
                e.printStackTrace();
                logger.error("[commonExport]", e.getMessage());
            }
            return dataFile;
        }
    
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    上述代码为基础版本可正常运行,但是不够完善,如果导出数据为空未反馈提示给前端,之后再做优化。

    大批量数据导出可参考我的另一篇文章
    java实现数据导出为excel文件

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  • 原文地址:https://blog.csdn.net/qq_37713521/article/details/133960504