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package wiki.xsx.core.pdf.doc;

import lombok.SneakyThrows;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageTree;
import wiki.xsx.core.pdf.util.XEasyPdfConvertUtil;
import wiki.xsx.core.pdf.util.XEasyPdfFileUtil;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.OutputStream;
import java.io.Serializable;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;

/**
 * pdf文档拆分器
 *
 * @author xsx
 * @date 2020/5/24
 * @since 1.8
 * 

* Copyright (c) 2020-2022 xsx All Rights Reserved. * x-easypdf is licensed under Mulan PSL v2. * You can use this software according to the terms and conditions of the Mulan PSL v2. * You may obtain a copy of Mulan PSL v2 at: * http://license.coscl.org.cn/MulanPSL2 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE. * See the Mulan PSL v2 for more details. *

*/ public class XEasyPdfDocumentSplitter implements Serializable { private static final long serialVersionUID = -1959028511245585789L; /** * pdfbox文档 */ private final PDDocument document; /** * pdf文档 */ private final XEasyPdfDocument pdfDocument; /** * 拆分文档列表 */ private final List> documentList = new ArrayList<>(10); /** * 构造方法私有化 */ XEasyPdfDocumentSplitter(XEasyPdfDocument pdfDocument) { this.pdfDocument = pdfDocument; this.document = this.pdfDocument.build(true); } /** * 添加拆分文档 * * @param pageIndex 拆分页面索引 * @return 返回pdf文档拆分器 */ public XEasyPdfDocumentSplitter addDocument(int... pageIndex) { this.documentList.add(XEasyPdfConvertUtil.toInteger(pageIndex)); return this; } /** * 拆分文档 * * @param outputPath 输出路径(目录) * @return 返回pdf文档 */ public XEasyPdfDocumentSplitter split(String outputPath) { return this.split(outputPath, null); } /** * 拆分文档 * * @param outputPath 输出路径(目录) * @param prefix 文档名称前缀 * @return 返回pdf文档 */ @SneakyThrows public XEasyPdfDocumentSplitter split(String outputPath, String prefix) { // 如果文档名称前缀为空,则设置默认值为"x-easypdf" if (prefix == null) { // 初始化文档名称前缀 prefix = "x-easypdf"; } // 文件名称构造器 StringBuilder fileNameBuilder; // 如果拆分文档列表不为空,则使用拆分文档列表进行拆分,否则按单页面拆分 if (!this.documentList.isEmpty()) { // 遍历拆分页面列表 for (int i = 0, count = this.documentList.size(); i < count; i++) { // 新建文件名称构造器 fileNameBuilder = new StringBuilder(); // 构建文件名称 fileNameBuilder.append(outputPath).append(File.separator).append(prefix).append(i + 1).append(".pdf"); // 获取输出流 try (OutputStream outputStream = new BufferedOutputStream(Files.newOutputStream(XEasyPdfFileUtil.createDirectories(Paths.get(fileNameBuilder.toString()))))) { // 拆分文档 this.split(outputStream, XEasyPdfConvertUtil.toInt(this.documentList.get(i))); } } } // 按单页面拆分 else { // 定义拆分文档列表索引 int index = 1; // 获取pdfbox页面树 PDPageTree pageTree = this.document.getPages(); // 遍历页面树 for (PDPage sourcePage : pageTree) { // 创建任务 PDDocument target = new PDDocument(); // 添加页面 PDPage importPage = target.importPage(sourcePage); // 添加页面资源 importPage.setResources(sourcePage.getResources()); // 新建文件名称构造器 fileNameBuilder = new StringBuilder(); // 构建文件名称 fileNameBuilder.append(outputPath).append(File.separator).append(prefix).append(index).append(".pdf"); // 获取输出流 try (OutputStream outputStream = new BufferedOutputStream(Files.newOutputStream(XEasyPdfFileUtil.createDirectories(Paths.get(fileNameBuilder.toString()))))) { // 替换总页码占位符 this.pdfDocument.replaceTotalPagePlaceholder(target, false); // 设置基础信息(文档信息、保护策略、版本、xmp信息及书签) this.pdfDocument.setBasicInfo(target); // 保存文档 target.save(outputStream); // 关闭文档 target.close(); } // 拆分文档列表索引自增 index++; } } return this; } /** * 拆分文档 * * @param outputStream 输出流 * @param pageIndex 页面索引 * @return 返回pdf文档 */ @SneakyThrows public XEasyPdfDocumentSplitter split(OutputStream outputStream, int... pageIndex) { // 新建任务文档 try (PDDocument target = new PDDocument()) { // 获取源文档页面树 PDPageTree sourcePages = this.document.getPages(); // 遍历页面索引 for (int index : pageIndex) { // 获取源文档页面 PDPage pdPage = sourcePages.get(index); // 任务文档添加页面 PDPage importPage = target.importPage(pdPage); // 设置页面资源缓存 importPage.setResources(pdPage.getResources()); } // 替换总页码占位符 this.pdfDocument.replaceTotalPagePlaceholder(target, false); // 设置基础信息(文档信息、保护策略、版本、xmp信息及书签) this.pdfDocument.setBasicInfo(target); // 保存任务文档 target.save(outputStream); // 关闭文档 } return this; } /** * 完成操作 * * @return 返回pdf文档 */ public XEasyPdfDocument finish() { return this.pdfDocument; } }




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