最近项目需要实现PDF下载的功能，由于没有这方面的经验，从网上花了很长时间查找了相关的资料。整理之后，发现有几个框架可以实现这个功能。
1. 开源框架支持
2. 实现方案
比较了一番后，采用了FreeMarker+docx4j+Apache PDFBox的方案：
maven依赖
<!-- pdfbox -->
<dependency>
<groupId>org.apache.pdfbox</groupId>
<artifactId>pdfbox</artifactId>
<version>2.0.11</version>
</dependency>
<!-- docx4j -->
<dependency>
<groupId>org.docx4j</groupId>
<artifactId>docx4j</artifactId>
<version>3.3.7</version>
</dependency>
<dependency>
<groupId>org.apache.xmlgraphics</groupId>
<artifactId>batik-util</artifactId>
<version>1.10</version>
</dependency>
<dependency>
<groupId>org.docx4j</groupId>
<artifactId>docx4j-export-fo</artifactId>
<version>3.3.6</version>
</dependency>
<!-- https://mvnrepository.com/artifact/dom4j/dom4j -->
<dependency>
<groupId>dom4j</groupId>
<artifactId>dom4j</artifactId>
<version>1.6.1</version>
</dependency>
<!-- image -->
<dependency>
<groupId>net.coobird</groupId>
<artifactId>thumbnailator</artifactId>
<version>0.4.8</version>
</dependency>
<!-- json -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.47</version>
</dependency>
步骤
1 把pdf文档对应的word(docx)制作出来
2 把word文档另存为xml文件
另存为xml
3 将xml文件制作为freemarker模版(ftl)文件
制作模版文件
4 将数据和ftl文件组装为xml文本
Map<String, Object> map = new HashMap<>();
map.put("name", "小明");
map.put("address", "北京市朝阳区");
map.put("email", "xiaoming@abc.com");
StringWriter stringWriter = new StringWriter();
BufferedWriter writer = new BufferedWriter(stringWriter);
template.process(map, writer);
String xmlStr = stringWriter.toString();
5 使用docx4j将xml文本加载为word文档对象
ByteArrayInputStream in = new ByteArrayInputStream(xmlStr.getBytes()); WordprocessingMLPackage wordMLPackage = WordprocessingMLPackage.load(in);
6 使用docx4j将word文档转存为pdf文档
String outputfilepath = "/Users/xiaoming/简历.pdf"; Docx4J.toPDF(wordMLPackage, new FileOutputStream(new File(outputfilepath)));
7 使用Apache PDFbox将多个pdf文档合为一个
String folderName = "/Users/xiaoming/pdfs";
String destPath = "/Users/xiaoming/all.pdf";
PDFMergerUtility mergePdf = new PDFMergerUtility();
String[] filesInFolder = getFiles(folderName);
Arrays.sort(filesInFolder, new Comparator<String>() {
@Override
public int compare(String o1, String o2) {
return o1.compareTo(o2);
}
});
for (int i = 0; i < filesInFolder.length; i++) {
mergePdf.addSource(folderName + File.separator + filesInFolder[i ]);
}
mergePdf.setDestinationFileName(destPath);
mergePdf.mergeDocuments(MemoryUsageSetting.setupMainMemoryOnly());
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
