ConvertUtil

1. word2pdf
- 1.1 aspose-word插件
- 1.2 word转pdf
- - 1.2.1 添加license文件
  - 1.2.2 具体实现
2. pdf2imgByPage
- 2.1 icepdf插件
- - 2.1.1 安装插件
  - 2.1.2 ImageIO missing required plug-in to read JPEG 2000 images
- 2.2 pdf按页转换成图片
- - 2.2.1 方法
  - 2.2.2 与Controller层的交互
3. 完整代码实现
- 3.1 ConvertUtil
- 2.2 FileController

需求如标题。

1. word2pdf

1.1 aspose-word插件

首先要解决在linux下将word转换成pdf，使用aspose-words。
插件地址：java实现Word转Pdf（Windows、Linux通用）
附在maven项目中导入已有jar包的方法：
在idea中执行mvn命令：IDEA执行maven命令
安装命令：

模板：
mvn install:install-file -Dfile=<path-to-file> -DgroupId=<group-id> -DartifactId=<artifact-id> -Dversion=<version> -Dpackaging=<packaging>

mvn install:install-file -DgroupId=com.aspose -DartifactId=aspose-words -Dversion=15.8.0 -Dpackaging=jar -Dfile=aspose-words-15.8.0-jdk16.jar

.xml中添加依赖

<dependency><groupId>com.aspose</groupId><artifactId>aspose-words</artifactId><version>15.8.0</version>
</dependency>

1.2 word转pdf

1.2.1 添加license文件

license.xml在resources根目录下，防止转换出来的pdf有水印

<?xml version="1.0" encoding="UTF-8" ?>
<License><Data><Products><Product>Aspose.Total for Java</Product><Product>Aspose.Words for Java</Product></Products><EditionType>Enterprise</EditionType><SubscriptionExpiry>20991231</SubscriptionExpiry><LicenseExpiry>20991231</LicenseExpiry><SerialNumber>8bfe198c-7f0c-4ef8-8ff0-acc3237bf0d7</SerialNumber></Data><Signature>sNLLKGMUdF0r8O1kKilWAGdgfs2BvJb/2Xp8p5iuDVfZXmhppo+d0Ran1P9TKdjV4ABwAgKXxJ3jcQTqE/2IRfqwnPf8itN8aFZlV3TJPYeD3yWE7IT55Gz6EijUpC7aKeoohTb4w2fpox58wWoF3SNp6sK6jDfiAUGEHYJ9pjU=</Signature>
</License>

1.2.2 具体实现

 public static boolean getLicense() {boolean result = false;InputStream is = null;try {Resource resource = new ClassPathResource("license.xml");is = resource.getInputStream();//InputStream is = Word2PdfAsposeUtil.class.getClassLoader().getResourceAsStream("license.xml"); // license.xml应放在..\WebRoot\WEB-INF\classes路径下License aposeLic = new License();aposeLic.setLicense(is);result = true;} catch (Exception e) {e.printStackTrace();}finally {if (is != null) {try {is.close();} catch (IOException e) {e.printStackTrace();}}}return result;}public static boolean doc2pdf(String inPath, String outPath) {if (!getLicense()) { // 验证License 若不验证则转化出的pdf文档会有水印产生return false;}FileOutputStream os = null;try {long old = System.currentTimeMillis();File file = new File(outPath); // 新建一个空白pdf文档os = new FileOutputStream(file);com.aspose.words.Document doc = new com.aspose.words.Document(inPath); // Address是将要被转化的word文档doc.save(os, SaveFormat.PDF);// 全面支持DOC, DOCX, OOXML, RTF HTML, OpenDocument, PDF,// EPUB, XPS, SWF 相互转换long now = System.currentTimeMillis();System.out.println("pdf转换成功，共耗时：" + ((now - old) / 1000.0) + "秒"); // 转化用时} catch (Exception e) {e.printStackTrace();return false;}finally {if (os != null) {try {os.flush();os.close();} catch (IOException e) {e.printStackTrace();}}}return true;}

2. pdf2imgByPage

2.1 icepdf插件

2.1.1 安装插件

pom.xml中添加依赖：

     <dependency><groupId>org.icepdf.os</groupId><artifactId>icepdf-core</artifactId><version>6.1.2</version><exclusions><exclusion><groupId>javax.media</groupId><artifactId>jai-core</artifactId></exclusion></exclusions></dependency>

2.1.2 ImageIO missing required plug-in to read JPEG 2000 images

添加依赖：

 <dependency><groupId>com.github.jai-imageio</groupId><artifactId>jai-imageio-core</artifactId><version>1.3.1</version></dependency><dependency><groupId>com.github.jai-imageio</groupId><artifactId>jai-imageio-jpeg2000</artifactId><version>1.3.0</version></dependency>

2.2 pdf按页转换成图片

2.2.1 方法

 public static BufferedImage pdf2ImgByPage(String pdfPath, float zoom, int page) throws PDFSecurityException, PDFException, IOException {org.icepdf.core.pobjects.Document document = null;float rotation = 0f;document = new org.icepdf.core.pobjects.Document();document.setFile(pdfPath);BufferedImage img = (BufferedImage) document.getPageImage(page,GraphicsRenderingHints.SCREEN,Page.BOUNDARY_CROPBOX,rotation,zoom);document.dispose();return img;}

2.2.2 与Controller层的交互

 @RequestMapping("/previewFile")public void previewFileByPage(HttpServletRequest request, HttpServletResponse response) throws IOException, PDFSecurityException, PDFException {int id = Integer.parseInt(request.getParameter("id"));int page = Integer.parseInt(request.getParameter("page"));File file = fileService.getFileByID(id);BufferedImage img = ConvertUtil.pdf2ImgByPage(file.getPath(), 1, page);ByteArrayOutputStream os = new ByteArrayOutputStream();ImageIO.write(img, "png", os);InputStream in = new ByteArrayInputStream(os.toByteArray());ServletOutputStream sos = null;try {sos = response.getOutputStream();byte[] b = new byte[1024];while (in.read(b) != -1) {sos.write(b);    //输出}sos.flush();           //刷新} catch (Exception e) {e.printStackTrace();} finally {try {in.close();        //关闭文件读取流，输出流sos.close();} catch (IOException e) {e.printStackTrace();}}}

3. 完整代码实现

3.1 ConvertUtil

package com.main.datainfo.utils;import com.aspose.words.License;
import com.aspose.words.SaveFormat;
import org.icepdf.core.exceptions.PDFException;
import org.icepdf.core.exceptions.PDFSecurityException;
import org.icepdf.core.pobjects.Page;
import org.icepdf.core.util.GraphicsRenderingHints;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriter;
import javax.imageio.stream.ImageOutputStream;
import java.awt.image.BufferedImage;
import java.io.*;
import java.text.DecimalFormat;
import java.util.Iterator;public class ConvertUtil {public static final String FILETYPE_JPG = "jpg";public static boolean getLicense() {boolean result = false;InputStream is = null;try {Resource resource = new ClassPathResource("license.xml");is = resource.getInputStream();//InputStream is = Word2PdfAsposeUtil.class.getClassLoader().getResourceAsStream("license.xml"); // license.xml应放在..\WebRoot\WEB-INF\classes路径下License aposeLic = new License();aposeLic.setLicense(is);result = true;} catch (Exception e) {e.printStackTrace();}finally {if (is != null) {try {is.close();} catch (IOException e) {e.printStackTrace();}}}return result;}public static boolean doc2pdf(String inPath, String outPath) {if (!getLicense()) { // 验证License 若不验证则转化出的pdf文档会有水印产生return false;}FileOutputStream os = null;try {long old = System.currentTimeMillis();File file = new File(outPath); // 新建一个空白pdf文档os = new FileOutputStream(file);com.aspose.words.Document doc = new com.aspose.words.Document(inPath); // Address是将要被转化的word文档doc.save(os, SaveFormat.PDF);// 全面支持DOC, DOCX, OOXML, RTF HTML, OpenDocument, PDF,// EPUB, XPS, SWF 相互转换long now = System.currentTimeMillis();System.out.println("pdf转换成功，共耗时：" + ((now - old) / 1000.0) + "秒"); // 转化用时} catch (Exception e) {e.printStackTrace();return false;}finally {if (os != null) {try {os.flush();os.close();} catch (IOException e) {e.printStackTrace();}}}return true;}/**** 将指定的pdf文件转换为指定路径的图片** @param pdfPath 原文件路径，例如d:/test/test.pdf** @param imgPath 图片生成路径，例如 d:/test/** @param zoom 缩略图显示倍数，1表示不缩放，0.3则缩小到30%**/public static void pdf2Img(String pdfPath, String imgPath, float zoom) throws PDFException, PDFSecurityException, IOException {org.icepdf.core.pobjects.Document document = null;float rotation = 0f;document = new org.icepdf.core.pobjects.Document();document.setFile(pdfPath);int maxPages = document.getPageTree().getNumberOfPages();for (int i = 0; i < maxPages; i++) {BufferedImage img = (BufferedImage) document.getPageImage(i, GraphicsRenderingHints.SCREEN, Page.BOUNDARY_CROPBOX, rotation, zoom);Iterator iter = ImageIO.getImageWritersBySuffix(FILETYPE_JPG);ImageWriter writer = (ImageWriter) iter.next();File outFile = new File(imgPath + new File(pdfPath).getName() + "_" + new DecimalFormat("000").format(i) + "." + FILETYPE_JPG);FileOutputStream out = new FileOutputStream(outFile);ImageOutputStream outImage = ImageIO.createImageOutputStream(out);writer.setOutput(outImage);writer.write(new IIOImage(img, null, null));}System.out.println("转换完成");}public static int getPageSize(String pdfPath) throws PDFSecurityException, PDFException, IOException {org.icepdf.core.pobjects.Document document = null;document = new org.icepdf.core.pobjects.Document();document.setFile(pdfPath);return document.getPageTree().getNumberOfPages();}public static BufferedImage pdf2ImgByPage(String pdfPath, float zoom, int page) throws PDFSecurityException, PDFException, IOException {org.icepdf.core.pobjects.Document document = null;float rotation = 0f;document = new org.icepdf.core.pobjects.Document();document.setFile(pdfPath);BufferedImage img = (BufferedImage) document.getPageImage(page,GraphicsRenderingHints.SCREEN,Page.BOUNDARY_CROPBOX,rotation,zoom);document.dispose();return img;}
}

2.2 FileController

package com.main.datainfo.controller;import com.main.datainfo.entity.File;
import com.main.datainfo.service.FileService;
import com.main.datainfo.utils.ConvertUtil;
import org.icepdf.core.exceptions.PDFException;
import org.icepdf.core.exceptions.PDFSecurityException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.*;@RestController
@RequestMapping("/file")
public class FileController {@Autowiredprivate FileService fileService;@RequestMapping("/previewFile")public void previewFileByPage(HttpServletRequest request, HttpServletResponse response) throws IOException, PDFSecurityException, PDFException {int id = Integer.parseInt(request.getParameter("id"));int page = Integer.parseInt(request.getParameter("page"));File file = fileService.getFileByID(id);BufferedImage img = ConvertUtil.pdf2ImgByPage(file.getPath(), 1, page);ByteArrayOutputStream os = new ByteArrayOutputStream();ImageIO.write(img, "png", os);InputStream in = new ByteArrayInputStream(os.toByteArray());ServletOutputStream sos = null;try {sos = response.getOutputStream();byte[] b = new byte[1024];while (in.read(b) != -1) {sos.write(b);    //输出}sos.flush();           //刷新} catch (Exception e) {e.printStackTrace();} finally {try {in.close();        //关闭文件读取流，输出流sos.close();} catch (IOException e) {e.printStackTrace();}}}}

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