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https://gitee.com/kekingcn/file-online-preview.git
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231 lines
8.2 KiB
Java
231 lines
8.2 KiB
Java
package cn.keking.utils;
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import com.lowagie.text.Document;
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import com.lowagie.text.Image;
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import com.lowagie.text.Rectangle;
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import com.lowagie.text.pdf.PdfWriter;
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import com.lowagie.text.pdf.RandomAccessFileOrArray;
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import com.lowagie.text.pdf.codec.TiffImage;
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import com.sun.media.jai.codec.*;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import javax.media.jai.JAI;
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import javax.media.jai.RenderedOp;
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import java.awt.image.RenderedImage;
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import java.awt.image.renderable.ParameterBlock;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.List;
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public class ConvertPicUtil {
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private final static Logger logger = LoggerFactory.getLogger(ConvertPicUtil.class);
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/**
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* Tif 转 JPG。
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*
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* @param strInputFile 输入文件的路径和文件名
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* @param strOutputFile 输出文件的路径和文件名
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* @return boolean 是否转换成功
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*/
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public static List<String> convertTif2Jpg(String strInputFile, String strOutputFile) {
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List<String> listImageFiles = new ArrayList<>();
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if (strInputFile == null || "".equals(strInputFile.trim())) {
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return null;
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}
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if (!new File(strInputFile).exists()) {
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logger.info("找不到文件【" + strInputFile + "】");
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return null;
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}
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strInputFile = strInputFile.replaceAll("\\\\", "/");
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strOutputFile = strOutputFile.replaceAll("\\\\", "/");
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FileSeekableStream fileSeekStream = null;
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try {
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JPEGEncodeParam jpegEncodeParam = new JPEGEncodeParam();
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TIFFEncodeParam tiffEncodeParam = new TIFFEncodeParam();
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tiffEncodeParam.setCompression(TIFFEncodeParam.COMPRESSION_GROUP4);
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tiffEncodeParam.setLittleEndian(false);
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String strFilePrefix = strInputFile.substring(strInputFile.lastIndexOf("/") + 1, strInputFile.lastIndexOf("."));
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fileSeekStream = new FileSeekableStream(strInputFile);
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ImageDecoder imageDecoder = ImageCodec.createImageDecoder("TIFF", fileSeekStream, null);
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int intTifCount = imageDecoder.getNumPages();
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logger.info("该tif文件共有【" + intTifCount + "】页");
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String strJpgPath;
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String strJpgUrl;
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if (intTifCount == 1) {
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// 如果是单页tif文件,则转换的目标文件夹就在指定的位置
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strJpgPath = strOutputFile.substring(0, strOutputFile.lastIndexOf("/"));
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} else {
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// 如果是多页tif文件,则在目标文件夹下,按照文件名再创建子目录,将转换后的文件放入此新建的子目录中
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strJpgPath = strOutputFile.substring(0, strOutputFile.lastIndexOf("."));
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}
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// 处理目标文件夹,如果不存在则自动创建
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File fileJpgPath = new File(strJpgPath);
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if (!fileJpgPath.exists() && !fileJpgPath.mkdirs()) {
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logger.error("{} 创建失败", strJpgPath);
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}
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// 循环,处理每页tif文件,转换为jpg
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for (int i = 0; i < intTifCount; i++) {
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String strJpg;
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if (intTifCount == 1) {
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strJpg = strJpgPath + "/" + strFilePrefix + ".jpg";
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strJpgUrl = strFilePrefix + ".jpg";
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} else {
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strJpg = strJpgPath + "/" + i + ".jpg";
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strJpgUrl = strFilePrefix + "/" + i + ".jpg";
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}
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File fileJpg = new File(strJpg);
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// 如果文件不存在,则生成
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if (!fileJpg.exists()) {
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RenderedImage renderedImage = imageDecoder.decodeAsRenderedImage(i);
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ParameterBlock pb = new ParameterBlock();
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pb.addSource(renderedImage);
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pb.add(fileJpg.toString());
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pb.add("JPEG");
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pb.add(jpegEncodeParam);
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RenderedOp renderedOp = JAI.create("filestore", pb);
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renderedOp.dispose();
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logger.info("每页分别保存至: " + fileJpg.getCanonicalPath());
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} else {
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logger.info("JPG文件已存在: " + fileJpg.getCanonicalPath());
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}
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listImageFiles.add(strJpgUrl);
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}
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return listImageFiles;
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} catch (IOException e) {
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e.printStackTrace();
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return null;
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} finally {
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if (fileSeekStream != null) {
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try {
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fileSeekStream.close();
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} catch (IOException e) {
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logger.error(e.getMessage(), e);
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}
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}
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}
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}
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/**
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* 将Jpg图片转换为Pdf文件
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*
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* @param strJpgFile 输入的jpg的路径和文件名
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* @param strPdfFile 输出的pdf的路径和文件名
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*/
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public static void convertJpg2Pdf(String strJpgFile, String strPdfFile) {
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Document document = new Document();
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// 设置文档页边距
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document.setMargins(0, 0, 0, 0);
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FileOutputStream fos = null;
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try {
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fos = new FileOutputStream(strPdfFile);
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PdfWriter.getInstance(document, fos);
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// 打开文档
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document.open();
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// 获取图片的宽高
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Image image = Image.getInstance(strJpgFile);
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float floatImageHeight = image.getScaledHeight();
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float floatImageWidth = image.getScaledWidth();
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// 设置页面宽高与图片一致
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Rectangle rectangle = new Rectangle(floatImageWidth, floatImageHeight);
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document.setPageSize(rectangle);
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// 图片居中
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image.setAlignment(Image.ALIGN_CENTER);
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//新建一页添加图片
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document.newPage();
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document.add(image);
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} catch (Exception ioe) {
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ioe.printStackTrace();
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} finally {
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//关闭文档
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document.close();
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try {
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assert fos != null;
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fos.flush();
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fos.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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/**
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* 将Tif图片转换为Pdf文件(支持多页Tif)
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*
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* @param strTifFile 输入的tif的路径和文件名
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* @param strPdfFile 输出的pdf的路径和文件名
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* @return File
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*/
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public static File convertTif2Pdf(String strTifFile, String strPdfFile) {
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try {
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RandomAccessFileOrArray rafa = new RandomAccessFileOrArray(strTifFile);
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Document document = new Document();
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// 设置文档页边距
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document.setMargins(0, 0, 0, 0);
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PdfWriter.getInstance(document, new FileOutputStream(strPdfFile));
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document.open();
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int intPages = TiffImage.getNumberOfPages(rafa);
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Image image;
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File filePDF;
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if (intPages == 1) {
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String strJpg = strTifFile.substring(0, strTifFile.lastIndexOf(".")) + ".jpg";
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File fileJpg = new File(strJpg);
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List<String> listPic2Jpg = convertTif2Jpg(strTifFile, strJpg);
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if (listPic2Jpg != null && fileJpg.exists()) {
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convertJpg2Pdf(strJpg, strPdfFile);
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}
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} else {
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for (int i = 1; i <= intPages; i++) {
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image = TiffImage.getTiffImage(rafa, i);
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// 设置页面宽高与图片一致
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Rectangle pageSize = new Rectangle(image.getScaledWidth(), image.getScaledHeight());
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document.setPageSize(pageSize);
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// 图片居中
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image.setAlignment(Image.ALIGN_CENTER);
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//新建一页添加图片
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document.newPage();
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document.add(image);
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}
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document.close();
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}
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rafa.close();
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filePDF = new File(strPdfFile);
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return filePDF;
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} catch (Exception e) {
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logger.error(e.getMessage(), e);
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}
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return null;
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}
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} |