Menggunakan Java SpringBoot untuk menyepadukan POI untuk mengeksport dokumen Word

Persediaan pengetahuan

Anda perlu memahami piawaian yang dipatuhi Apache POI (standard Office Open XML (OOXML) dan Format Dokumen Komposit OLE 2 Microsoft (OLE2)), yang sepadan dengan kebergantungan pakej API.

Apakah itu POI

Apache POI ialah API Java merentas platform sumber terbuka yang ditulis dalam Java Apache POI menyediakan API untuk program Java untuk membaca Microsoft Office memformat fail dan menulis fungsi. POI ialah singkatan "Pelaksanaan Kekeliruan Lemah", yang bermaksud "versi ringkas pelaksanaan kabur".

Apache POI ialah API Java yang mencipta dan mengekalkan operasi yang mematuhi piawaian Office Open XML (OOXML) dan Format Dokumen Kompaun OLE 2 (OLE2) Microsoft. Sila rujuk kepada dokumentasi rasmi untuk maklumat lanjut.

Kes Pelaksanaan

Berikut ialah contoh Word SpringBoot menyepadukan POI untuk mengeksport maklumat pengguna.

Kebergantungan Pom

Perkenalkan pakej kebergantungan poi

<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>5.2.2</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>5.2.2</version>
</dependency>

Eksport Word

Kaedah yang dieksport dalam UserController

package tech.pdai.springboot.file.word.poi.controller;


import java.io.OutputStream;

import javax.servlet.http.HttpServletResponse;

import io.swagger.annotations.ApiOperation;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import tech.pdai.springboot.file.word.poi.service.IUserService;

/**
* @author pdai
*/
@RestController
@RequestMapping("/user")
public class UserController {

@Autowired
private IUserService userService;

@ApiOperation("Download Word")
@GetMapping("/word/download")
public void download(HttpServletResponse response){
try {
XWPFDocument document = userService.generateWordXWPFDocument();
response.reset();
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-disposition",
"attachment;filename=user_world_" + System.currentTimeMillis() + ".docx");
OutputStream os = response.getOutputStream();
document.write(os);
os.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}

🎜>Kaedah Eksport Word dalam UserServiceImple

package tech.pdai.springboot.file.word.poi.service.impl;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.List;

import lombok.extern.slf4j.Slf4j;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.util.Units;
import org.apache.poi.xwpf.usermodel.BreakType;
import org.apache.poi.xwpf.usermodel.Document;
import org.apache.poi.xwpf.usermodel.ParagraphAlignment;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFParagraph;
import org.apache.poi.xwpf.usermodel.XWPFRun;
import org.apache.poi.xwpf.usermodel.XWPFTable;
import org.apache.poi.xwpf.usermodel.XWPFTableCell;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTTblPr;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTTblWidth;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.stereotype.Service;
import tech.pdai.springboot.file.word.poi.entity.User;
import tech.pdai.springboot.file.word.poi.service.IUserService;

/**
* @author pdai
*/
@Slf4j
@Service
public class UserServiceImpl implements IUserService {

@Override
public XWPFDocument generateWordXWPFDocument(){
XWPFDocument doc = new XWPFDocument();

// Title
createTitle(doc, "Java 全栈知识体系");

// Chapter 1
createChapterH1(doc, "1. 知识准备");
createChapterH2(doc, "1.1 什么是POI");
createParagraph(doc, "Apache POI 是创建和维护操作各种符合Office Open XML（OOXML）标准和微软的OLE 2复合文档格式（OLE2）的Java API。用它可以使用Java读取和创建,修改MS Excel文件.而且,还可以使用Java读取和创建MS Word和MSPowerPoint文件。更多请参考[官方文档](https://poi.apache.org/index.html)");
createChapterH2(doc, "1.2 POI中基础概念");
createParagraph(doc, "生成xls和xlsx有什么区别？POI对Excel中的对象的封装对应关系？");

// Chapter 2
createChapterH1(doc, "2. 实现案例");
createChapterH2(doc, "2.1 用户列表示例");
createParagraph(doc, "以导出用户列表为例");

// 表格
List<User> userList = getUserList();
XWPFParagraph paragraph = doc.createParagraph();
XWPFTable table = paragraph.getDocument().createTable(userList.size(), 5);
table.setWidth(500);
table.setCellMargins(20, 20, 20, 20);

//表格属性
CTTblPr tablePr = table.getCTTbl().addNewTblPr();
//表格宽度
CTTblWidth width = tablePr.addNewTblW();
width.setW(BigInteger.valueOf(8000));

for(int i = 0; i< userList.size(); i++) {
List<XWPFTableCell> tableCells = table.getRow(i).getTableCells();
tableCells.get(0).setText(userList.get(i).getId()+"");
tableCells.get(1).setText(userList.get(i).getUserName());
tableCells.get(2).setText(userList.get(i).getEmail());
tableCells.get(3).setText(userList.get(i).getPhoneNumber()+"");
tableCells.get(4).setText(userList.get(i).getDescription());
}

createChapterH2(doc, "2.2 图片导出示例");
createParagraph(doc, "以导出图片为例");
// 图片
InputStream stream = null;
try {
XWPFParagraph paragraph3 = doc.createParagraph();
Resource resource = new ClassPathResource("pdai-guli.png");
stream = new FileInputStream(resource.getFile());
XWPFRun run = paragraph3.createRun();
run.addPicture(stream, Document.PICTURE_TYPE_PNG, "Generated", Units.toEMU(256), Units.toEMU(256));
} catch (IOException | InvalidFormatException e) {
e.printStackTrace();
}

return doc;
}

private void createTitle(XWPFDocument doc, String content){
XWPFParagraph title = doc.createParagraph();
title.setAlignment(ParagraphAlignment.CENTER);
XWPFRun r1 = title.createRun();
r1.setBold(true);
r1.setFontFamily("宋体");
r1.setText(content);
r1.setFontSize(22);
}

private void createChapterH1(XWPFDocument doc, String content){
XWPFParagraph actTheme = doc.createParagraph();
actTheme.setAlignment(ParagraphAlignment.LEFT);
XWPFRun runText1 = actTheme.createRun();
runText1.setBold(true);
runText1.setText(content);
runText1.setFontSize(18);
}
private void createChapterH2(XWPFDocument doc, String content){
XWPFParagraph actType = doc.createParagraph();
XWPFRun runText2 = actType.createRun();
runText2.setBold(true);
runText2.setText(content);
runText2.setFontSize(15);
}

private void createParagraph(XWPFDocument doc, String content){
XWPFParagraph actType = doc.createParagraph();
XWPFRun runText2 = actType.createRun();
runText2.setText(content);
runText2.setFontSize(11);
}

private List<User> getUserList(){
List<User> userList = new ArrayList<>();
for (int i = 0; i < 5; i++) {
userList.add(User.builder()
.id(Long.parseLong(i + "")).userName("pdai" + i).email("pdai@pdai.tech" + i).phoneNumber(121231231231L)
.description("hello world" + i)
.build());
}
return userList;
}
}

Eksport:

Perkataan yang dieksport:

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