前言
本来想写word转pdf和pdf转word的代码呢，没想到word转pdf就写了很多很多行代码才实现，为了方便大家消化理解，先写了word转pdf方法实现作为一篇文章。
word转pdf实现思路
代码实现主要依赖两个第三方jar包，一个是pdfbox，一个是aspose-words。pdfbox包完全开源免费，aspose-words免费版生成有水印，且生成数量有限制。单纯用pdfbox 实现word转pdf的话，实现非常复杂，且样式和原来样式，保持一致的的比例很低。所以，我先用aspose-words生成了带水印的pdf，再用pdfbox去除aspose-words生成的水印的，最终得到了一个无水印的pdf。
项目远程仓库
aspose-words 这个需要配置单独的仓库地址才能下载，不会配置的可以去官网直接下载jar引入项目代码中。
<repositories> <repository> <id>asposejavaapi</id> <name>aspose java api</name> <url>https://repository.aspose.com/repo/</url> </repository>
maven项目pom文件依赖
<!-- https://mvnrepository.com/artifact/org.apache.pdfbox/pdfbox --> <dependency> <groupid>org.apache.pdfbox</groupid> <artifactid>pdfbox</artifactid> <version>3.0.0-rc1</version> </dependency> <dependency> <groupid>com.github.jai-imageio</groupid> <artifactid>jai-imageio-jpeg2000</artifactid> <version>1.3.0</version> </dependency> <dependency> <groupid>com.aspose</groupid> <artifactid>aspose-words</artifactid> <version>21.9</version> <type>pom</type> </dependency>
核心代码实现
import com.aspose.words.document;
import com.aspose.words.saveformat;
import org.apache.pdfbox.loader;
import org.apache.pdfbox.contentstream.operator.operator;
import org.apache.pdfbox.cos.cosarray;
import org.apache.pdfbox.cos.cosdictionary;
import org.apache.pdfbox.cos.cosname;
import org.apache.pdfbox.cos.cosstring;
import org.apache.pdfbox.pdfparser.pdfstreamparser;
import org.apache.pdfbox.pdfwriter.contentstreamwriter;
import org.apache.pdfbox.pdmodel.pddocument;
import org.apache.pdfbox.pdmodel.pdpage;
import org.apache.pdfbox.pdmodel.pdpagetree;
import org.apache.pdfbox.pdmodel.pdresources;
import org.apache.pdfbox.pdmodel.common.pdstream;
import java.io.file;
import java.io.fileoutputstream;
import java.io.ioexception;
import java.io.outputstream;
import java.util.arraylist;
import java.util.iterator;
import java.util.list;
public class pdfhelper3 {
public static void main(string[] args) throws ioexception {
doc2pdf("c:\\users\\liuya\\desktop\\word\\帆软报表帮助文档.docx");
}
//替换pdf文本内容
public static void replacetext(pdpage page, string searchstring, string replacement) throws ioexception {
pdfstreamparser parser = new pdfstreamparser(page);
list<?> tokens = parser.parse();
for (int j = 0; j < tokens.size(); j++) {
object next = tokens.get(j);
if (next instanceof operator) {
operator op = (operator) next;
string pstring = "";
int prej = 0;
if (op.getname().equals("tj")) {
cosstring previous = (cosstring) tokens.get(j - 1);
string string = previous.getstring();
string = string.replacefirst(searchstring, replacement);
previous.setvalue(string.getbytes());
} else if (op.getname().equals("tj")) {
cosarray previous = (cosarray) tokens.get(j - 1);
for (int k = 0; k < previous.size(); k++) {
object arrelement = previous.getobject(k);
if (arrelement instanceof cosstring) {
cosstring cosstring = (cosstring) arrelement;
string string = cosstring.getstring();
if (j == prej) {
pstring += string;
} else {
prej = j;
pstring = string;
}
}
}
if (searchstring.equals(pstring.trim())) {
cosstring cosstring2 = (cosstring) previous.getobject(0);
cosstring2.setvalue(replacement.getbytes());
int total = previous.size() - 1;
for (int k = total; k > 0; k--) {
previous.remove(k);
}
}
}
}
}
list<pdstream> contents = new arraylist<>();
iterator<pdstream> streams = page.getcontentstreams();
while (streams.hasnext()) {
pdstream updatedstream = streams.next();
outputstream out = updatedstream.createoutputstream(cosname.flate_decode);
contentstreamwriter tokenwriter = new contentstreamwriter(out);
tokenwriter.writetokens(tokens);
contents.add(updatedstream);
out.close();
}
page.setcontents(contents);
}
//移除图片水印
public static void removeimage(pdpage page, string cosname) {
pdresources resources = page.getresources();
cosdictionary dict1 = resources.getcosobject();
resources.getxobjectnames().foreach(e -> {
if (resources.isimagexobject(e)) {
cosdictionary dict2 = dict1.getcosdictionary(cosname.xobject);
if (e.getname().equals(cosname)) {
dict2.removeitem(e);
}
}
page.setresources(new pdresources(dict1));
});
}
//移除文字水印
public static boolean removewatermark(file file) {
try {
//通过文件名加载文档
pddocument document = loader.loadpdf(file);
pdpagetree pages = document.getpages();
iterator<pdpage> iter = pages.iterator();
while (iter.hasnext()) {
pdpage page = iter.next();
//去除文字水印
replacetext(page, "evaluation only. created with aspose.words. copyright 2003-2021 aspose", "");
replacetext(page, "pty ltd.", "");
replacetext(page, "created with an evaluation copy of aspose.words. to discover the full", "");
replacetext(page, "versions of our apis please visit: https://products.aspose.com/words/", "");
replacetext(page, "this document was truncated here because it was created in the evaluation", "");
//去除图片水印
removeimage(page, "x1");
}
document.removepage(document.getnumberofpages() - 1);
file.delete();
document.save(file);
document.close();
return true;
} catch (ioexception ex) {
ex.printstacktrace();
return false;
}
}
//doc文件转pdf(目前最大支持21页)
public static void doc2pdf(string wordpath) {
long old = system.currenttimemillis();
try {
//新建一个pdf文档
string pdfpath=wordpath.substring(0,wordpath.lastindexof("."))+".pdf";
file file = new file(pdfpath);
fileoutputstream os = new fileoutputstream(file);
//address是将要被转化的word文档
document doc = new document(wordpath);
//全面支持doc, docx, ooxml, rtf html, opendocument, pdf, epub, xps, swf 相互转换
doc.save(os, saveformat.pdf);
os.close();
//去除水印
removewatermark(new file(pdfpath));
//转化用时
long now = system.currenttimemillis();
system.out.println("word 转 pdf 共耗时：" + ((now - old) / 1000.0) + "秒");
} catch (exception e) {
system.out.println("word 转 pdf 失败...");
e.printstacktrace();
}
}
}
结果分析
以一个带文字和图片，工21页的doc文件为例，word转pdf花费时长4.398秒
原word样式
转化后pdf效果图
通过对比，word原来的样式和转换pdf文件后的样式基本没有变化。
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