WEB下载数据量大的EXCEL解决方案

2019独角兽企业重金招聘Python工程师标准>>>

思路:需要2次请求，第一次ajax请求把数据查询出来，按照1000条数据一个sheet，在后台生成临时文件，并把文件名称返回给web，第二次请求直接下载临时文件下载完成后，删除临时文件

代码如下web端：

// 导出 function cmd_toExcel() {$.messager.progress({ title: '请等待', msg: "<span style='color:green'>人生若只如初见</span>", text: '努力下载中.......' });$.ajax({type : "post",url : cmd.toexport,data : formToObject('.searchBox'),dataType : "json",success : function(data) {location.href = _ctx + "/rest/download/getfile?name=" + data + "&originFileName=" + "车辆统计.xls";$.messager.progress('close');}}); }

 后台服务端，生成临时文件接口：

/*** 导出* * @throws Exception*/@RequestMapping(value = "/toexport", method = { RequestMethod.POST, RequestMethod.GET })@ResponseBodypublic String export(HttpServletRequest request, String area, Integer trans, String org, String no,AnalysisDate analysisdate, @RequestParam(required = false, defaultValue = "VEH_ID") String sort,@RequestParam(required = false, defaultValue = "asc") String order) throws Exception {Pageable pageable = new PageRequest(0, 1000000, new Sort("asc".equalsIgnoreCase(order) ? Direction.ASC: Direction.DESC, sort, "VEH_ID"));List<Map<String, Object>> list = manager.statistics(area, trans, org, no, analysisdate,SpringSecurityUtils.getCurrentUserArea(), pageable).getContent();String title = "车辆统计表";String[] rowsName = new String[] {"序号", "道路运输证号", "车牌", "企业名称", "所属区域", "运输行业分类", "车辆类型", "上线时长", "断开时长", "报警次数"};List<Object[]> dataList = new ArrayList<Object[]>();Object[] objs = null;for (int i = 0; i < list.size(); i++) {Map<String, Object> man = list.get(i);objs = new Object[rowsName.length];objs[0] = i;objs[1] = man.get("RTPN");objs[2] = man.get("VEH_ID") == null ? "" : man.get("VEH_ID");objs[3] = man.get("ORG_NAME") == null ? "" : man.get("ORG_NAME");objs[4] = man.get("AREANAME");objs[5] = man.get("TRANS_TYPE");objs[6] = man.get("VTYPE");objs[7] = durationFormatter(((BigDecimal)man.get("ONLINE_TIME")).intValue());objs[8] = durationFormatter(((BigDecimal)man.get("OFF_TIME")).intValue());objs[9] = man.get("WARN_AMOUNT");dataList.add(objs);}ExportExcel ex = new ExportExcel(title, rowsName, dataList, request);return ex.export();} package com.wttech.gnss.utils;import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.util.ArrayList; import java.util.List; import java.util.UUID;import javax.servlet.http.HttpServletRequest;import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFCellStyle; import org.apache.poi.hssf.usermodel.HSSFFont; import org.apache.poi.hssf.usermodel.HSSFRichTextString; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.hssf.util.CellRangeAddress; import org.apache.poi.hssf.util.HSSFColor;/*** 导出Excel公共方法* **/ public class ExportExcel {// 显示的导出表的标题private String title;// 导出表的列名private String[] rowName;private List<Object[]> dataList = new ArrayList<Object[]>();HttpServletRequest request;// 构造方法，传入要导出的数据public ExportExcel(String title, String[] rowName, List<Object[]> dataList, HttpServletRequest request) {this.request = request;this.dataList = dataList;this.rowName = rowName;this.title = title;}/** 导出数据*/@SuppressWarnings("deprecation")public String export() throws Exception {String uuid = "/temp_" + UUID.randomUUID().toString() + ".xls";String filename = Properties.UPLOAD_ADDRESS + uuid;try {HSSFWorkbook workbook = new HSSFWorkbook(); // 创建工作簿对象int sheets = dataList.size() / 50000 + 1;for (int m = 0; m < sheets; m++) {HSSFSheet sheet = workbook.createSheet(title + m); // 创建工作表// 产生表格标题行HSSFRow rowm = sheet.createRow(0);HSSFCell cellTiltle = rowm.createCell(0);// sheet样式定义【getColumnTopStyle()/getStyle()均为自定义方法 - 在下面 - 可扩展】HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);// 获取列头样式对象HSSFCellStyle style = this.getStyle(workbook); // 单元格样式对象HSSFCellStyle headerStyle = getHeaderStyle(workbook);sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length - 1)));cellTiltle.setCellStyle(headerStyle);cellTiltle.setCellValue(title);// 定义所需列数int columnNum = rowName.length;HSSFRow rowRowName = sheet.createRow(2); // 在索引3的位置创建行(最顶端的行开始的第3行)// 将列头设置到sheet的单元格中for (int n = 0; n < columnNum; n++) {HSSFCell cellRowName = rowRowName.createCell(n); // 创建列头对应个数的单元格cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING); // 设置列头单元格的数据类型HSSFRichTextString text = new HSSFRichTextString(rowName[n]);cellRowName.setCellValue(text); // 设置列头单元格的值cellRowName.setCellStyle(columnTopStyle); // 设置列头单元格样式}// 将查询出的数据设置到sheet对应的单元格中List<Object[]> sub = dataList.subList(m * 50000, (m + 1) * 50000 < dataList.size() ? (m + 1) * 50000: dataList.size());for (int i = 0; i < sub.size(); i++) {Object[] obj = sub.get(i);// 遍历每个对象HSSFRow row = sheet.createRow(i + 3);// 创建所需的行数for (int j = 0; j < obj.length; j++) {HSSFCell cell = null; // 设置单元格的数据类型if (j == 0) {cell = row.createCell(j, HSSFCell.CELL_TYPE_NUMERIC);cell.setCellValue(i + 1);} else {cell = row.createCell(j, HSSFCell.CELL_TYPE_STRING);if (obj[j] != null) {cell.setCellValue(obj[j].toString()); // 设置单元格的值} else {cell.setCellValue(""); // 设置单元格的值}}cell.setCellStyle(style); // 设置单元格样式}}// 让列宽随着导出的列长自动适应for (int colNum = 0; colNum < columnNum; colNum++) {switch (colNum) {case 0:sheet.setColumnWidth(colNum, 6 * 256);break;default:sheet.setColumnWidth(colNum, 20 * 256);break;}}}if (workbook != null) {try {File file = new File(filename);// 以流的形式下载文件。BufferedOutputStream fis = new BufferedOutputStream(new FileOutputStream(file));workbook.write(fis);fis.flush();// 刷新流fis.close();// 关闭流} catch (IOException e) {e.printStackTrace();}}} catch (Exception e) {e.printStackTrace();}return uuid;}/** 表头单元格样式*/public HSSFCellStyle getHeaderStyle(HSSFWorkbook workbook) {// 设置字体HSSFFont font = workbook.createFont();// 设置字体大小font.setFontHeightInPoints((short) 11);// 字体加粗font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);// 设置字体名字font.setFontName("Courier New");// 设置样式;HSSFCellStyle style = workbook.createCellStyle();// 在样式用应用设置的字体;style.setFont(font);// 设置自动换行;style.setWrapText(false);// 设置水平对齐的样式为居中对齐;style.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 设置垂直对齐的样式为居中对齐;style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);return style;}/** 表头单元格样式*/public HSSFCellStyle getRightStyle(HSSFWorkbook workbook) {// 设置字体HSSFFont font = workbook.createFont();// 设置字体大小font.setFontHeightInPoints((short) 11);// 字体加粗font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);// 设置字体名字font.setFontName("Courier New");// 设置样式;HSSFCellStyle style = workbook.createCellStyle();// 在样式用应用设置的字体;style.setFont(font);// 设置自动换行;style.setWrapText(false);// 设置水平对齐的样式为居中对齐;style.setAlignment(HSSFCellStyle.ALIGN_RIGHT);// 设置垂直对齐的样式为居中对齐;style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);return style;}/** 列头单元格样式*/public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) {// 设置字体HSSFFont font = workbook.createFont();// 设置字体大小font.setFontHeightInPoints((short) 11);// 字体加粗font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);// 设置字体名字font.setFontName("Courier New");// 设置样式;HSSFCellStyle style = workbook.createCellStyle();// 设置底边框;style.setBorderBottom(HSSFCellStyle.BORDER_THIN);// 设置底边框颜色;style.setBottomBorderColor(HSSFColor.BLACK.index);// 设置左边框;style.setBorderLeft(HSSFCellStyle.BORDER_THIN);// 设置左边框颜色;style.setLeftBorderColor(HSSFColor.BLACK.index);// 设置右边框;style.setBorderRight(HSSFCellStyle.BORDER_THIN);// 设置右边框颜色;style.setRightBorderColor(HSSFColor.BLACK.index);// 设置顶边框;style.setBorderTop(HSSFCellStyle.BORDER_THIN);// 设置顶边框颜色;style.setTopBorderColor(HSSFColor.BLACK.index);// 在样式用应用设置的字体;style.setFont(font);// 设置自动换行;style.setWrapText(false);// 设置水平对齐的样式为居中对齐;style.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 设置垂直对齐的样式为居中对齐;style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);return style;}/** 表头单元格样式*/public HSSFCellStyle getFootStyle(HSSFWorkbook workbook) {// 设置字体HSSFFont font = workbook.createFont();// 设置字体大小font.setFontHeightInPoints((short) 11);// 字体加粗font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);// 设置字体名字font.setFontName("Courier New");// 设置样式;HSSFCellStyle style = workbook.createCellStyle();// 在样式用应用设置的字体;style.setFont(font);// 设置自动换行;style.setWrapText(false);// 设置水平对齐的样式为居中对齐;style.setAlignment(HSSFCellStyle.ALIGN_RIGHT);// 设置垂直对齐的样式为居中对齐;style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);return style;}/** 列数据信息单元格样式*/public HSSFCellStyle getStyle(HSSFWorkbook workbook) {// 设置字体HSSFFont font = workbook.createFont();// 设置字体大小// font.setFontHeightInPoints((short)10);// 字体加粗// font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);// 设置字体名字font.setFontName("Courier New");// 设置样式;HSSFCellStyle style = workbook.createCellStyle();// 设置底边框;style.setBorderBottom(HSSFCellStyle.BORDER_THIN);// 设置底边框颜色;style.setBottomBorderColor(HSSFColor.BLACK.index);// 设置左边框;style.setBorderLeft(HSSFCellStyle.BORDER_THIN);// 设置左边框颜色;style.setLeftBorderColor(HSSFColor.BLACK.index);// 设置右边框;style.setBorderRight(HSSFCellStyle.BORDER_THIN);// 设置右边框颜色;style.setRightBorderColor(HSSFColor.BLACK.index);// 设置顶边框;style.setBorderTop(HSSFCellStyle.BORDER_THIN);// 设置顶边框颜色;style.setTopBorderColor(HSSFColor.BLACK.index);// 在样式用应用设置的字体;style.setFont(font);// 设置自动换行;style.setWrapText(false);// 设置水平对齐的样式为居中对齐;style.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 设置垂直对齐的样式为居中对齐;style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);return style;} }

接口2下载临时文件，并删除

@RequestMapping(value = "/getfile")@ResponseBodypublic void getfile(HttpServletRequest request,HttpServletResponse response,String name,String originFileName) throws ParseException {String path = Properties.UPLOAD_ADDRESS + name ;File file = new File(path);// 以流的形式下载文件。InputStream fis;try {fis = new BufferedInputStream(new FileInputStream(path));byte[] buffer = new byte[fis.available()];fis.read(buffer);fis.close();response.reset();response.addHeader("Content-Disposition", "attachment;filename=" +URLEncoder.encode(originFileName, "UTF-8"));response.setCharacterEncoding("utf-8");response.addHeader("Content-Length", "" + file.length());OutputStream toClient = new BufferedOutputStream(response.getOutputStream());response.setContentType("application/octet-stream");toClient.write(buffer);toClient.flush();toClient.close();if (name.contains("temp")) {file.delete();}} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}

 

转载于:https://my.oschina.net/chuibilong/blog/845053

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