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效果图：
实现
1.在pom中添加依赖：
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi --> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.17</version> </dependency>
2.ExcelUtil工具类：
package com.feicuiedu.survey.util; import org.apache.poi.hssf.usermodel.*; import org.apache.poi.hssf.util.HSSFColor; import org.apache.poi.ss.usermodel.FillPatternType; import org.apache.poi.ss.usermodel.HorizontalAlignment; import org.apache.poi.ss.usermodel.VerticalAlignment; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletResponse; import java.io.*; import java.util.List; import java.util.Map; /** * Created by Bella on 2018/2/5. */ public class ExcelUtil { /** * 创建excel文档， * list 数据 * @param keys list中map的key数组集合 * @param columnNames excel的列名 * */ public static HSSFWorkbook createWorkBook(List<Map<String, Object>> list, String []keys, String columnNames[]) { // 创建excel工作簿 HSSFWorkbook wb = new HSSFWorkbook(); // 创建第一个sheet页，并命名 HSSFSheet sheet = wb.createSheet(list.get(0).get("sheetName").toString()); // 设置列宽 for(int i=0;i<keys.length;i++){ //最后一列为附件URL地址,列宽设置大一些 if(i==(keys.length-1)){ sheet.setColumnWidth((short) i, (short) (200*120)); }else{ sheet.setColumnWidth((short) i, (short) (50*60)); } } // 创建第一行，并设置其单元格格式 HSSFRow row = sheet.createRow((short) 0); row.setHeight((short)500); // 单元格格式(用于列名) HSSFCellStyle cs = wb.createCellStyle(); HSSFFont f = wb.createFont(); f.setFontName("宋体"); f.setFontHeightInPoints((short) 10); f.setBold(true); cs.setFont(f); cs.setAlignment(HorizontalAlignment.CENTER);// 水平居中 cs.setVerticalAlignment(VerticalAlignment.CENTER);// 垂直居中 cs.setLocked(true); cs.setWrapText(true);//自动换行 //设置列名 for(int i=0;i<columnNames.length;i++){ HSSFCell cell = row.createCell(i); cell.setCellValue(columnNames[i]); cell.setCellStyle(cs); } //设置首行外,每行每列的值(Row和Cell都从0开始) for (short i = 1; i < list.size(); i++) { HSSFRow row1 = sheet.createRow((short) i); String flag = ""; //在Row行创建单元格 for(short j=0;j<keys.length;j++){ HSSFCell cell = row1.createCell(j); cell.setCellValue(list.get(i).get(keys[j]) == null?" ": list.get(i).get(keys[j]).toString()); if(list.get(i).get(keys[j])!=null){ if("优".equals(list.get(i).get(keys[j]).toString())){ flag = "优"; }else if("差".equals(list.get(i).get(keys[j]).toString())) { flag = "差"; } } } //设置该行样式 HSSFFont f2 = wb.createFont(); f2.setFontName("宋体"); f2.setFontHeightInPoints((short) 10); if("优".equals(flag)){ HSSFCellStyle cellStyle = wb.createCellStyle(); cellStyle.setFont(f2); cellStyle.setAlignment(HorizontalAlignment.CENTER);// 左右居中 cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);// 上下居中 cellStyle.setLocked(true); cellStyle.setWrapText(true);//自动换行 cellStyle.setFillForegroundColor(HSSFColor.HSSFColorPredefined.YELLOW.getIndex());// 设置背景色 cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND); //依次为每个单元格设置样式 for(int m=0;m<keys.length;m++){ HSSFCell hssfCell = row1.getCell(m); hssfCell.setCellStyle(cellStyle); } }else if("差".equals(flag)){ HSSFCellStyle cellStyle2 = wb.createCellStyle(); cellStyle2.setFont(f2); cellStyle2.setAlignment(HorizontalAlignment.CENTER);// 左右居中 cellStyle2.setVerticalAlignment(VerticalAlignment.CENTER);// 上下居中 cellStyle2.setLocked(true); cellStyle2.setWrapText(true);//自动换行 cellStyle2.setFillForegroundColor(HSSFColor.HSSFColorPredefined.RED.getIndex());// 设置背景色 cellStyle2.setFillPattern(FillPatternType.SOLID_FOREGROUND); for(int m=0;m<keys.length;m++){ HSSFCell hssfCell = row1.getCell(m); hssfCell.setCellStyle(cellStyle2); } }else{ HSSFCellStyle cs2 = wb.createCellStyle(); cs2.setFont(f2); cs2.setAlignment(HorizontalAlignment.CENTER);// 左右居中 cs2.setVerticalAlignment(VerticalAlignment.CENTER);// 上下居中 cs2.setLocked(true); cs2.setWrapText(true);//自动换行 for(int m=0;m<keys.length;m++){ HSSFCell hssfCell = row1.getCell(m); hssfCell.setCellStyle(cs2); } } } return wb; } //生成并下载Excel public static void downloadWorkBook(List<Map<String,Object>> list, String keys[], String columnNames[], String fileName, HttpServletResponse response) throws IOException{ ByteArrayOutputStream os = new ByteArrayOutputStream(); try { ExcelUtil.createWorkBook(list,keys,columnNames).write(os); } catch (IOException e) { e.printStackTrace(); } byte[] content = os.toByteArray(); InputStream is = new ByteArrayInputStream(content); // 设置response参数 response.reset(); response.setContentType("application/vnd.ms-excel;charset=utf-8"); response.setHeader("Content-Disposition", "attachment;filename="+ new String((fileName + ".xls").getBytes(), "iso-8859-1")); ServletOutputStream out = response.getOutputStream(); BufferedInputStream bis = null; BufferedOutputStream bos = null; try { bis = new BufferedInputStream(is); bos = new BufferedOutputStream(out); byte[] buff = new byte[2048]; int bytesRead; while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) { bos.write(buff, 0, bytesRead); } } catch (final IOException e) { throw e; } finally { if (bis != null) bis.close(); if (bos != null) bos.close(); } } }
3.service 接口：
String export(HttpServletResponse response,
Integer regionid,
Integer schoolid,
Integer majorid,
String beginDate,
String endDate);
4.service 接口实现类：
/** * 导出Excel表 * @param regionid 大区id * @param schoolid 校区id * @param majorid 专业id * @param beginDate 开始日期 * @param endDate 结束日期 * @return */ public String export(HttpServletResponse response, Integer regionid, Integer schoolid, Integer majorid, String beginDate, String endDate){ try { List<ProjectAuditListVo> projectAuditListVoList = projectAuditMapper.query(0,regionid,schoolid,majorid,null,beginDate,endDate,null,null); String fileName="项目审核表"; List<Map<String,Object>> list=createExcelRecord(projectAuditListVoList); String columnNames[] = {"大区","校区","专业","面授教师","在线教师","班级", "项目所处阶段","作品人次","项目提交日期","项目得分", "得分等级","原因","项目评价","附件"};//列名 String keys[] = {"regionName","schoolName","majorName","teacherName","onlineTeacherName", "className","stage","workNum", "submitTime","score","rank","reason","evaluate","attachment",};//map中的key ExcelUtil.downloadWorkBook(list,keys,columnNames,fileName,response); } catch (IOException e) { e.printStackTrace(); } return "excel"; } /** * 创建Excel表中的记录 * @param projectAuditListVoList * @return */ private List<Map<String, Object>> createExcelRecord(List<ProjectAuditListVo> projectAuditListVoList){ List<Map<String, Object>> listmap = new ArrayList<Map<String, Object>>(); try { Map<String, Object> map = new HashMap<String, Object>(); map.put("sheetName", "sheet1"); listmap.add(map); for (int j = 0; j < projectAuditListVoList.size(); j++) { ProjectAuditListVo projectAuditListVo=projectAuditListVoList.get(j); Map<String, Object> mapValue = new HashMap<String, Object>(); mapValue.put("regionName",projectAuditListVo.getRegionName()); mapValue.put("schoolName",projectAuditListVo.getSchoolName()); mapValue.put("majorName",projectAuditListVo.getMajorName()); mapValue.put("teacherName",projectAuditListVo.getTeacherName()); mapValue.put("onlineTeacherName",projectAuditListVo.getOnlineTeacherName()); mapValue.put("className",projectAuditListVo.getClassName()); mapValue.put("stage",projectAuditListVo.getStage()); mapValue.put("workNum",projectAuditListVo.getWorkNum()); mapValue.put("submitTime", DateTimeUtil.dateToStr(projectAuditListVo.getSubmitTime(),"yyyy-MM-dd")); mapValue.put("score",projectAuditListVo.getScore()); mapValue.put("rank",projectAuditListVo.getRank()); mapValue.put("reason",projectAuditListVo.getReason()); mapValue.put("evaluate",projectAuditListVo.getEvaluate()); String attachmentURL = projectAuditListVo.getAttachment()==null?"无":FileUtil.getUploadPath()+projectAuditListVo.getAttachment(); mapValue.put("attachment",attachmentURL); listmap.add(mapValue); } } catch (Exception e) { e.printStackTrace(); } return listmap; }
其中，
List<ProjectAuditListVo> projectAuditListVoList = projectAuditMapper.query(0,regionid,schoolid,majorid,null,beginDate,endDate,null,null);
为调用dao 层方法，获取 Excel中数据源。此处，dao层方法省略
5.controller层：
@RequestMapping(value = "/export",produces = {"application/vnd.ms-excel;charset=UTF-8"})
@ResponseBody
public String export(HttpServletResponse response,
@RequestParam(value = "regionid",required = false) Integer regionid,
@RequestParam(value = "schoolid",required = false) Integer schoolid,
@RequestParam(value = "majorid",required = false) Integer majorid,
@RequestParam(value = "beginDate",required = false) String beginDate,
@RequestParam(value = "endDate",required = false) String endDate){
return iProjectAuditService.export(response,regionid,schoolid,majorid,beginDate,endDate);
}
6.访问export接口，则会自动下载生成的Excel文件至本地。Excel文件效果图如上图所示。