1、安装引用Apache POI

Maven中pom.xml中添加依赖如下：

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.15</version>
</dependency>

2、读取txt文件中内容

可以读取txt文本文件中内容插入word中。

public String convertTextFileToString(String fileName) {
    try (Stream<String> stream 
      = Files.lines(Paths.get(ClassLoader.getSystemResource(fileName).toURI()))) {
        return stream.collect(Collectors.joining(" "));
    } catch (IOException | URISyntaxException e) {
        return null;
    }
}

3、格式化标题和子标题

创建标题，需要首先实例化XWPFParagraph类，并在新对象上设置对齐方式：

XWPFDocument document = new XWPFDocument();
XWPFParagraph title = document.createParagraph();
title.setAlignment(ParagraphAlignment.CENTER);
//段落的内容需要包装在XWPFRun对象中,可以配置此对象以设置文本值及其关联的样式：
XWPFRun titleRun = title.createRun();
titleRun.setText("Build Your REST API with Spring");
titleRun.setColor("009933");
titleRun.setBold(true);
titleRun.setFontFamily("Courier");
titleRun.setFontSize(20);
//创建一个XWPFParagraph实例，该实例包含子标题
XWPFParagraph subTitle = document.createParagraph();
subTitle.setAlignment(ParagraphAlignment.CENTER);
XWPFRun subTitleRun = subTitle.createRun();
subTitleRun.setText("from HTTP fundamentals to API Mastery");
subTitleRun.setColor("00CC44");
subTitleRun.setFontFamily("Courier");
subTitleRun.setFontSize(16);
subTitleRun.setTextPosition(20);
subTitleRun.setUnderline(UnderlinePatterns.DOT_DOT_DASH);

4、word中插入图片

图片也需要包装在XWPFParagraph实例中。要将图片水平居中放置在字幕下方，则需将下面代码段放在上面给出的代码下方：

XWPFParagraph image = document.createParagraph();
image.setAlignment(ParagraphAlignment.CENTER);
//设置此图像与其下方文本之间距离的方法
XWPFRun imageRun = image.createRun();
imageRun.setTextPosition(20);
//获取图像，然后将其插入具有指定尺寸的MS Word文件中
Path imagePath = Paths.get(ClassLoader.getSystemResource(logo).toURI());
imageRun.addPicture(Files.newInputStream(imagePath),
  XWPFDocument.PICTURE_TYPE_PNG, imagePath.getFileName().toString(),
  Units.toEMU(50), Units.toEMU(50));

5、通过txt文件中内容创建段落并设置格式

//通过txt中内容创建第一段
WPFParagraph para1 = document.createParagraph();
para1.setAlignment(ParagraphAlignment.BOTH);
String string1 = convertTextFileToString("./paragraph1.txt");
XWPFRun para1Run = para1.createRun();
para1Run.setText(string1);
//创建另外两个段落
XWPFParagraph para2 = document.createParagraph();
para2.setAlignment(ParagraphAlignment.RIGHT);
String string2 = convertTextFileToString("./paragraph2.txt");
XWPFRun para2Run = para2.createRun();
para2Run.setText(string2);
para2Run.setItalic(true);
XWPFParagraph para3 = document.createParagraph();
para3.setAlignment(ParagraphAlignment.LEFT);
String string3 = convertTextFileToString("./paragraph3.txt");
XWPFRun para3Run = para3.createRun();
para3Run.setText(string3);

6、创建生成word文件

//XWPFDocument document = new XWPFDocument();
FileOutputStream out = new FileOutputStream(output);
document.write(out);
out.close();
document.close();

7､word添加水印

 //添加水印  
    public void createWaterMark(XWPFDocument doc){
        XWPFHeaderFooterPolicy policy=doc.getHeaderFooterPolicy();
        policy.createWatermark("中国华西监理信息管理平台");
    }

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