模擬業務場景：假設有一個OA系統，員工在里面填了請假申請，填好后可以通過下載自動生成一個word文檔的請假條。比如數據表有姓名，請假原因，時間等字段，將這些字段填充到一個word模板中。

1. 準備word模板

?注意：模板是通過 {{}} 雙括號的格式來表明哪些字段是代碼實現自動填充的，比如我表里面的請假原因字段名叫 reason ,那么在模板中就寫 {{reason}}，這樣就可以識別了，其他格式暫未測試。

將模板放到項目中resources下面的template文件夾中

位置如下：

?

2. maven依賴（某些版本有沖突）

<dependency><groupId>com.deepoove</groupId><artifactId>poi-tl</artifactId><version>1.5.1</version></dependency><!-- 1.5.1版本對應poi 3.16版本--><dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>3.16</version></dependency>

3. 代碼實現

3.1 實體類

import java.io.Serializable; import java.util.Date;/*** @author YuePeng* @date 2022/12/28 15:12* 這里只是模擬部分字段，并非真實表結構*/ public class LeaveForm implements Serializable {private static final long serialVersionUID = -5652177874505967327L;private String id;// 請假人private String name;// 請假原因private String reason;// 請假時間private Date leaveDate;public String getId() {return id;}public void setId(String id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getReason() {return reason;}public void setReason(String reason) {this.reason = reason;}public Date getLeaveDate() {return leaveDate;}public void setLeaveDate(Date leaveDate) {this.leaveDate = leaveDate;} }

3.2?實現類

public byte[] downloadWord(String id) {LeaveForm query = new LeaveForm();query.setId(id);//根據id查找數據LeaveForm leaveForm = leaveFormDao.selectByPrimaryKey(query);// 獲取文件流InputStream stream = LeaveFormServiceImpl.class.getClassLoader().getResourceAsStream("template/downloadWord.docx");// 填充數據Map<String, String> data = new HashMap<>();data.put("name", leaveForm.getName());data.put("reason", leaveForm.getReason());data.put("date", new SimpleDateFormat("yyyy年MM月dd日").format(leaveForm.getLeaveDate()));XWPFTemplate template = XWPFTemplate.compile(stream).render(data);//輸出流ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); return getBytes(template, outputStream);}private byte[] getBytes(XWPFTemplate template, ByteArrayOutputStream os) {byte[] bytes = new byte[0];try {template.write(os);bytes = os.toByteArray();} catch (IOException e) {e.printStackTrace();} finally {try {template.close();os.close();} catch (IOException e) {e.printStackTrace();}}return bytes;}

3.3 Controller層

@ApiOperation(value = "下載word", notes = "下載word")@RequestMapping(value = "/downloadWord", method = RequestMethod.GET)public ResponseEntity downloadWord(@ApiParam(value = "id") @RequestParam(required = true) String id) {byte[] bytes = leaveFormService.downloadWord(id);String fileName = "downloadWord.docx";HttpHeaders headers = new HttpHeaders();headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);headers.setContentDispositionFormData("attachment", fileName, StandardCharsets.UTF_8);return new ResponseEntity(bytes, headers, HttpStatus.OK);}

總結

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