使用poi导出excel
Posted wang66a
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了使用poi导出excel相关的知识,希望对你有一定的参考价值。
第一步添加依赖
<dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml --> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-scratchpad --> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-scratchpad</artifactId> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml-schemas --> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml-schemas</artifactId> </dependency>
第二部编写工具类
package com.shiwen.yitihui.achievement.util; import java.util.HashMap; import java.util.Map; /** * @author wangjie * @date 2019/12/21 11:41 * @description 资料处理导出excel文件的模板 * @company 石文软件有限公司 */ public class Constants { public interface Redis { String DRILL_STATISTICS_PREFIX = "DRILL-DAILY:"; } // 模板所在位置 public static final String TEMP_LOCATION = "excel/"; public static final String EXCEL_SUFFIX = ".xlsx"; // excel模板下载映射名称 public static final Map<String, String> excelMap = new HashMap<>(); static { excelMap.put("consolidated", "综合记录列表"); } // 录井详情表头 // public static final String DETAIL_HEADER = "井生产日报"; }
package com.shiwen.yitihui.achievement.util; /** * @author wangjie * @date 2019/12/21 12:01 * @description * @company 石文软件有限公司 */ public class Enums { public enum DataReportType { CONSOLIDATED("consolidated"), SINGLE("single"); private String value; DataReportType(String value) { this.value = value; } /** * 根据值获取类型 * * @param value * @return */ public static DataReportType getType(String value) { for (DataReportType type : DataReportType.values()) { if (type.getValue().equals(value)) { return type; } } return null; } public String getValue() { return value; } } }
package com.shiwen.yitihui.achievement.util; import org.apache.poi.ss.usermodel.*; import org.apache.poi.xssf.usermodel.XSSFWorkbook; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.lang.reflect.Field; import java.lang.reflect.Method; import java.nio.file.Files; import java.nio.file.Path; import java.util.List; /** * @author wangjie * @date 2019/12/20 18:26 * @description * @company 石文软件有限公司 */ public class ExcelUtils { /** * 创建Excel文件 * * @param path 路径 * @param list 数据 * @param <T> 模板 * @return * @throws IOException */ public static <T> boolean writeExcel(Path path, List<T> list) throws IOException { boolean success = false; if (Files.notExists(path)) { throw new IllegalArgumentException("文件不存在!"); } else { Workbook workbook = new XSSFWorkbook(new FileInputStream(path.toFile())); // 获取第一个sheet Sheet sheet = workbook.getSheetAt(0); // 遍历行 Row row; Cell cell; int index = 1; Field[] fields = new Field[0]; if (list != null && list.size() > 0) { // 利用反射获取传入对象第一个元素的所有属性 fields = list.get(0).getClass().getDeclaredFields(); } for (T value : list) { row = sheet.createRow(index++); // 遍历列 for (int i = 0; i < fields.length; i++) { // 创建单元格样式 cell = row.createCell(i); // 水平居中,四边设置边框 CellStyle cellStyle = InitDataStyle.getHorizontalCenterBorder(workbook); cellStyle.setWrapText(false); // 不换行 cell.setCellStyle(cellStyle); // 获取当前行内容对象 try { String filed = fields[i].getName(); // 反射方法过去值(都设置成String) String val = getObjectValue(value, filed); // 将值写入单元格 cell.setCellValue(val); } catch (Exception e) { e.printStackTrace(); } // 设置列宽自动调整 sheet.autoSizeColumn(i); } } OutputStream os = null; try { os = new FileOutputStream(path.toFile()); workbook.write(os); success = true; } finally { if (os != null) { os.close(); } if (workbook != null) { workbook.close(); } } return success; } } /** * 反射获取值 * * @param obj 对象 * @param cellValue 字段属性 * @param <T> 泛型 * @return String * @throws Exception */ private static <T> String getObjectValue(T obj, String cellValue) throws Exception { String getName = "get" + cellValue.substring(0, 1).toUpperCase() + cellValue.substring(1); Method method = obj.getClass().getMethod(getName); return method.invoke(obj) != null ? String.valueOf(method.invoke(obj)) : ""; } /** * 样式 */ public static class InitDataStyle { // 基础样式 static CellStyle getNormal(Workbook wb) { CellStyle cellStyle = wb.createCellStyle(); Font font = wb.createFont(); font.setFontName("宋体"); font.setFontHeightInPoints((short) 11); cellStyle.setFont(font); return cellStyle; } // 水平居中 四周边框 static CellStyle getHorizontalCenterBorder(Workbook wb) { CellStyle cellStyle = getNormal(wb); cellStyle.setAlignment(HorizontalAlignment.CENTER); cellStyle.setVerticalAlignment(VerticalAlignment.CENTER); // 边框 cellStyle.setBorderBottom(BorderStyle.THIN); cellStyle.setBorderLeft(BorderStyle.THIN); cellStyle.setBorderTop(BorderStyle.THIN); cellStyle.setBorderRight(BorderStyle.THIN); return cellStyle; } } }
package com.shiwen.yitihui.achievement.util; import java.io.InputStream; /** * @Author Cwang * @Date 2019/7/12 **/ public class FileUtil { public static InputStream getResourcesFileInputStream(String fileName) { return Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName); } }
编写控制层
package com.shiwen.yitihui.achievement.controller; import com.shiwen.yitihui.achievement.service.DataReportExcelService; import com.shiwen.yitihui.achievement.util.Constants; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.http.HttpHeaders; import org.springframework.http.HttpStatus; import org.springframework.http.MediaType; import org.springframework.http.ResponseEntity; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import javax.servlet.http.HttpServletRequest; import java.io.IOException; import java.net.URLEncoder; import java.nio.file.Files; import java.nio.file.Path; /** * @author wangjie * @date 2019/12/21 11:39 * @description 资料处理导出excel * @company 石文软件有限公司 */ @RestController @RequestMapping("/data") public class DataReportExcelController { @Autowired private DataReportExcelService dataReportExcelService; /** * 导出Excel * * @param request * @return * @throws IOException */ @GetMapping("/excel/") public ResponseEntity<byte[]> exportExcel(String type, String jh, HttpServletRequest request) throws IOException { /*type="consolidated"; vo.setJm("克104"); vo.setCurPage(1); vo.setPageSize(30);*/ //创建请求头对象 HttpHeaders headers = new HttpHeaders(); //设置请求的方式二进制文件 headers.setContentType(MediaType.APPLICATION_OCTET_STREAM); //设置读取文件的名字 headers.setContentDispositionFormData("attachment", getFileNameByBrowser(request, Constants.excelMap.get(type) + Constants.EXCEL_SUFFIX)); //获取二进制的excel文件 Path path = dataReportExcelService.getExcelFile(type, jh); //将二进制的excel文件转换成字节数组 byte[] bytes = Files.readAllBytes(path); //删除获取的二进制文件 Files.delete(path); //将字节数组响应在客户端页面 return new ResponseEntity<>(bytes, headers, HttpStatus.OK); } /** * 判断客户端浏览器类型 * * @param request * @return * @throws IOException */ private String getFileNameByBrowser(HttpServletRequest request, String fileName) throws IOException { String UserAgent = request.getHeader("USER-AGENT").toLowerCase(); if (UserAgent.contains("firefox")) { return new String(fileName.getBytes("UTF-8"), "iso-8859-1"); } else { return URLEncoder.encode(fileName, "UTF-8").replaceAll("+", "%20"); } } }
server层
package com.shiwen.yitihui.achievement.service; import java.io.IOException; import java.nio.file.Path; /** * @author wangjie * @date 2019/12/21 11:45 * @description * @company 石文软件有限公司 */ public interface DataReportExcelService { /** * 获取excel的二进制文件 * @param type * @param * @return * @throws IOException */ Path getExcelFile(String type, String jh) throws IOException; }
实现类
package com.shiwen.yitihui.achievement.service.impl; import com.shiwen.yitihui.achievement.dao.basic.ConsolidatedRecordsDao; import com.shiwen.yitihui.achievement.service.DataReportExcelService; import com.shiwen.yitihui.achievement.util.Constants; import com.shiwen.yitihui.achievement.util.Enums; import com.shiwen.yitihui.achievement.util.ExcelUtils; import com.shiwen.yitihui.achievement.util.FileUtil; import com.shiwen.yitihui.domain.basic.ConsolidatedRecords; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.nio.file.StandardCopyOption; import java.util.List; import java.util.UUID; /** * @author wangjie * @date 2019/12/21 11:50 * @description * @company 石文软件有限公司 */ @Service public class DataReportExcelServiceImpl implements DataReportExcelService { private static final String TEMP_FLODAE = System.getProperty("user.dir") + File.separator + "temp_excel"; @Autowired private ConsolidatedRecordsDao consolidatedRecordsDao; @Override public Path getExcelFile(String type, String jh) throws IOException { Enums.DataReportType reportType = Enums.DataReportType.getType(type); if (reportType == null) { return null; } Path path = null; switch (reportType) { case CONSOLIDATED: List<ConsolidatedRecords> list = consolidatedRecordsDao.getListByJh(jh); path = handleExcel(type, list); break; default: break; } return path; } /** * 处理excel * * @param type * @param list * @param <T> * @throws IOException */ private <T> Path handleExcel(String type, List<T> list) throws IOException { //读取对应excel文件的模板 InputStream excel = FileUtil.getResourcesFileInputStream(Constants.TEMP_LOCATION + type + Constants.EXCEL_SUFFIX); //创建带有文件路径的path对象 Path desPath = Paths.get(TEMP_FLODAE + File.separator + UUID.randomUUID().toString() + Constants.EXCEL_SUFFIX); Path pPath = desPath.getParent(); if (Files.notExists(pPath)) { Files.createDirectory(pPath); } //将excel文件模板,拷贝到path对象中 Files.copy(excel, desPath, StandardCopyOption.REPLACE_EXISTING); // if (Enums.DataReportType.SINGLE.getValue().equals(type)) { /*LoggingDTO logging = new LoggingDTO(); if (list.size() > 0) { logging = (LoggingDTO) list.get(0); } ExcelUtils.writeExcelDetail(desPath, logging, Constants.DETAIL_HEADER);*/ System.out.println("=================================使用定制模板"); } else { ExcelUtils.writeExcel(desPath, list); } return desPath; } }
前端代码
js
/** * 下载excel */ $scope.download = function () { ToastService.confirm("下载", "确认要导出数据吗?", function () { let param = ‘‘; angular.forEach($scope.condition, function (v, k) { if (v) { if ($scope.filter[k] != null && $scope.filter[k] != ‘全部‘) { if (‘hbrq‘ === k) { param += "&" + k + "=" + $scope.filter[k].format("yyyy-MM-dd"); } else { param += "&" + k + "=" + $scope.filter[k] } } } }); $window.location.href = url.excel + ‘?‘ + param.substring(1); }) };
以上是关于使用poi导出excel的主要内容,如果未能解决你的问题,请参考以下文章