门面模式（Facade）

public class Facade {
    /**
     * 传入数据，生成 PDF 文件
     */
    public static DataPdf getPdfData(Data data) {
        // 数据通过模板引擎生成 word
        // 即数据通过模板引擎，套用模板文件（模板.docx）生成出一个新的word文件
        DataWord dataWord = new DataWord(data, "./xxx/xxxx/模板.docx");
        // word 转换成 PDF
        DataPdf dataPdf = new DataPdf(dataWord);
        // PDF 进行加密处理
        dataPdf.encrypt("asd123!@#");

        return dataPdf;
    }
}

public class Data {
    private String title;
    private String content;
    // ... 省略 get set
}

public class DataWord {
    private String title;
    private String content;
    private String template;

    public DataWord(Data data,String template) {
        this.title = data.getTitle();
        this.content = data.getContent();
        this.template = template;
    }
    //... 省略 get
}

public class DataPdf {

    private String title;
    private String content;
    private String pwd;

    public DataPdf(DataWord word) {
        this.title = word.getTitle();
        this.content = word.getContent();
    }

    public void encrypt(String pwd) {
        this.pwd = pwd;
        System.out.println("对当前文档进行加密，密码：" + pwd);
    }

    //... 省略 get
}

public class FacadeTest {

    @Test
    public void test() {

        Data data = new Data();
        data.setTitle("标题");
        data.setContent("内容");

        DataPdf pdfData = Facade.getPdfData(data);

        Assertions.assertEquals("标题",pdfData.getTitle());
        Assertions.assertEquals("内容",pdfData.getContent());
        Assertions.assertEquals("asd123!@#",pdfData.getPwd());
    }
}