SpringBoot2.x使用POI实现导入数据到Excel

都嫣然

一、前言

最近做一个推送服务将系统某些报表，通过邮件附件的形式推送给指定的人，首先我们需要在服务端生成报表的excel文档。生成excel文档采用的是POI的方式。

二、pom引入相应的jar包

引入三个poi相关的jar包

1. <dependency>
2. <groupId>org.apache.poi</groupId>
3. <artifactId>poi</artifactId>
4. <version>4.1.2</version>
5. </dependency>
6. <dependency>
7. <groupId>org.apache.poi</groupId>
8. <artifactId>poi-ooxml</artifactId>
9. <version>4.1.2</version>
10. </dependency>
11. <dependency>
12. <groupId>org.apache.poi</groupId>
13. <artifactId>poi-ooxml-schemas</artifactId>
14. <version>4.1.2</version>
15. </dependency>

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注意：这三个jar包的版本号一定要保持一致。否则的话会引起异常，无法创建XSSFWorkbook

三、导出方法封装类

1. import lombok.extern.slf4j.Slf4j;
2. import org.apache.http.client.utils.DateUtils;
3. import org.apache.poi.ss.usermodel.Cell;
4. import org.apache.poi.ss.usermodel.Row;
5. import org.apache.poi.ss.usermodel.Sheet;
6. import org.apache.poi.ss.usermodel.Workbook;
7. import org.apache.poi.xssf.usermodel.XSSFWorkbook;
9. import java.io.FileOutputStream;
10. import java.io.IOException;
11. import java.sql.Timestamp;
12. import java.util.*;
14. /**
15. * POI导出Excel封装
16. * @author lenny
17. * @date 20210715
18. */
19. @Slf4j
20. public class ExcelUtil {
21. /**
22. * @param fileName excel文件名
23. * @param headMap 表头map
24. * @param dataList 表格数据
25. */
26. public static String exportExcel(String fileName,Map<String, String> headMap, List<Map<String, Object>> dataList) {
27. String fullPath="";
28. Workbook workbook = exportXlsx(fileName, headMap, dataList);
29. FileOutputStream outputStream=null;
30. try {
31. //将生成的excel存储在系统根目录下excel文件夹中
32. String path=CommonUtil.getRunningDirectory()+"\\excel\";
33. fullPath=path+fileName;
34. outputStream = new FileOutputStream(path+fileName);
35. workbook.write(outputStream);
36. } catch (Exception e) {
37. e.printStackTrace();
38. } finally {
39. if (outputStream != null) {
40. try {
41. outputStream.close();
42. } catch (IOException e) {
43. e.printStackTrace();
44. }
45. }
46. }
47. //返回文件所在的目录
48. return fullPath;
49. }
51. /**
52. * 导出数据
53. *
54. * @param headMap 表头map
55. * @param dataList 导出的数据
56. */
57. public static Workbook exportXlsx(String sheetName, Map<String, String> headMap, List<Map<String, Object>> dataList) {
58. try {
59. XSSFWorkbook workbook = new XSSFWorkbook();
60. Sheet sheet = workbook.createSheet(sheetName);
61. //初始化行列索引
62. int rowIndex = 0, columnIndex = 0;
63. Set<String> keys = headMap.keySet();
64. //表头
65. Row row = sheet.createRow(rowIndex++);
66. for (String key : keys) {
67. Cell cell = row.createCell(columnIndex++);
68. cell.setCellValue(headMap.get(key));
69. }
70. //内容
71. if (dataList != null && !dataList.isEmpty()) {
72. for (Map<String, Object> map : dataList) {
73. row = sheet.createRow(rowIndex++);
74. columnIndex = 0;
75. for (String key : keys) {
76. Cell cell = row.createCell(columnIndex++);
77. setCellValue(cell, map.get(key));
78. }
79. }
80. }
81. return workbook;
82. }catch (Exception e){
83. log.error(e.toString());
84. return null;
85. }
86. }
88. /**
89. * 填充单元格内容
90. * @param cell
91. * @param obj
92. */
93. private static void setCellValue(Cell cell, Object obj) {
94. if (obj == null) {
95. return;
96. }
97. if (obj instanceof String) {
98. cell.setCellValue((String) obj);
99. } else if (obj instanceof Date) {
100. Date date = (Date) obj;
101. if (date != null) {
102. cell.setCellValue(DateUtils.formatDate(date));
103. }
104. } else if (obj instanceof Calendar) {
105. Calendar calendar = (Calendar) obj;
106. if (calendar != null) {
107. cell.setCellValue(DateUtils.formatDate(calendar.getTime()));
108. }
109. } else if (obj instanceof Timestamp) {
110. Timestamp timestamp = (Timestamp) obj;
111. if (timestamp != null) {
112. cell.setCellValue(DateUtils.formatDate(new Date(timestamp.getTime())));
113. }
114. } else if (obj instanceof Double) {
115. cell.setCellValue((Double) obj);
116. } else {
117. cell.setCellValue(obj.toString());
118. }
119. }
120. }

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其中使用到了封装的获取系统根目录的方法，方法实现如下：

1. /**
2. * 得到程序运行的根目录
3. * @return
4. */
5. public static String getRunningDirectory()
6. {
7. return System.getProperty("user.dir");
8. }

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四、调用方法执行生成excel操作

1. /**
2. * 导出Adas报警
3. * @param reportAdasList
4. * @param language
5. * @param timeDiff
6. * @return
7. */
8. public static String exportAdasReport(List<ReportAdasList> reportAdasList, int language, int timeDiff) {
9. //表头
10. Map<String, String> headNameMap = new LinkedHashMap<String, String>();
11. headNameMap.put("agentName", getHeadName("agentName",language));
12. headNameMap.put("vehicleName", getHeadName("vehicleName",language));
13. headNameMap.put("assetID", getHeadName("assetID",language));
14. headNameMap.put("alarmType", getHeadName("alarmType",language));
15. headNameMap.put("alarmLevel", getHeadName("alarmLevel",language));
16. headNameMap.put("startTime", getHeadName("startTime",language));
17. headNameMap.put("endTime", getHeadName("endTime",language));
18. headNameMap.put("driverName", getHeadName("driverName",language));
19. headNameMap.put("startAddress", getHeadName("startAddress",language));
20. headNameMap.put("endAddress", getHeadName("endAddress",language));
21. headNameMap.put("processStatus", getHeadName("processStatus",language));
22. headNameMap.put("processContext", getHeadName("processContext",language));
23. headNameMap.put("processTime", getHeadName("processTime",language));
24. //表格数据
25. List<Map<String, Object>> dataList = new ArrayList<Map<String, Object>>();
26. for(ReportAdasList item : reportAdasList){
27. Map<String, Object> map = new HashMap<String, Object>();
28. map.put("agentName", item.getAgentName());
29. map.put("vehicleName", item.getVehicleName());
30. map.put("assetID", item.getAssetID());
31. map.put("alarmType", language==1?item.getCnName():item.getEnName());
32. map.put("alarmLevel", getAlarmLevel(item.getAlarmLevel(),language));
33. map.put("startTime", CommonUtil.getLocalTime(item.getStartTime(),timeDiff));
34. map.put("endTime", CommonUtil.getLocalTime(item.getEndTime(),timeDiff));
35. map.put("driverName", item.getDriverName());
36. map.put("startAddress", CommonUtil.geoCoding(String.valueOf(item.getStartLatitude()),String.valueOf(item.getStartLongitude()),language));
37. map.put("endAddress", CommonUtil.geoCoding(String.valueOf(item.getEndLatitude()),String.valueOf(item.getEndLongitude()),language));
38. map.put("processStatus", getProcessStatus(item.getProcessStatus(),language));
39. map.put("processContext", item.getProcessContext());
40. map.put("processTime", CommonUtil.getLocalTime(item.getProcessTime(),timeDiff));
41. dataList.add(map);
42. }
43. String fileName = "";
44. if(language==1) {
45. fileName= CommonConstants.CN_REPORT_ADAS;
46. }else {
47. fileName=CommonConstants.EN_REPORT_ADAS;
48. }
49. fileName=fileName+".xlsx";
50. String fullPath = ExcelUtil.exportExcel(fileName,headNameMap,dataList);
51. return fullPath;
52. }

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这里大家可以根据自己的系统自行调整，最后封装成headMap（表头字段）与List>（数据列表）即可。

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