ConvertUtil
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 {
@Autowired
private 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();
}
}
}
}