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tif图片预览。根据 @gaoxingzaq 反馈和帮助，修改tif文件的jpg、pdf模式预览功能，兼容多页tif的pdf转换、jpg转换，以及jpg在线多页预览功能。

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This commit is contained in:
zhangzhen1979
2021-12-16 17:05:18 +08:00
committed by kl
parent 20f328906c
commit 48f6a507dc
2 changed files with 204 additions and 71 deletions
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198
server/src/main/java/cn/keking/utils/ConvertPicUtil.java
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@ -5,55 +5,129 @@ import com.lowagie.text.Document;
import com.lowagie.text.Image;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.PdfWriter;
import com.sun.media.jai.codec.ImageCodec;
import com.sun.media.jai.codec.ImageEncoder;
import com.sun.media.jai.codec.JPEGEncodeParam;
import com.lowagie.text.pdf.RandomAccessFileOrArray;
import com.lowagie.text.pdf.codec.TiffImage;
import com.sun.media.jai.codec.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.media.jai.JAI;
import javax.media.jai.RenderedOp;
import java.io.*;
import java.awt.image.RenderedImage;
import java.awt.image.renderable.ParameterBlock;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class ConvertPicUtil {
private final static Logger logger = LoggerFactory.getLogger(ConvertPicUtil.class);
/**
* 图片 转 JPG。
* 支持输入格式如下：BMP、GIF、FlashPix、JPEG、PNG、PMN、TIFF、WBMP
* @param strInputFile 输入文件的路径和文件名
* Tif 转 JPG。
* @param strInputFile 输入文件的路径和文件名
* @param strOutputFile 输出文件的路径和文件名
* @return
* @return boolean 是否转换成功
*/
public static File convertPic2Jpg(String strInputFile, String strOutputFile) {
// 读取源图片文件
RenderedOp roInput = JAI.create("fileload", strInputFile);
public static List<String> convertTif2Jpg(String strInputFile, String strOutputFile) {
List<String> listImageFiles = new ArrayList<>();
if (strInputFile == null || "".equals(strInputFile.trim())) {
return null;
}
if (!new File(strInputFile).exists()) {
logger.info("找不到文件【" + strInputFile + "】");
return null;
}
strInputFile = strInputFile.replaceAll("\\\\", "/");
strOutputFile = strOutputFile.replaceAll("\\\\", "/");
FileSeekableStream fileSeekStream = null;
try {
strOutputFile = strOutputFile.replaceAll("\\\\", "/");
File fileJpgPath = new File(strOutputFile.substring(0, strOutputFile.lastIndexOf("/")));
if(!fileJpgPath.exists()){
JPEGEncodeParam jpegEncodeParam = new JPEGEncodeParam();
TIFFEncodeParam tiffEncodeParam = new TIFFEncodeParam();
tiffEncodeParam.setCompression(TIFFEncodeParam.COMPRESSION_GROUP4);
tiffEncodeParam.setLittleEndian(false);
String strFilePrefix = strInputFile.substring(strInputFile.lastIndexOf("/") + 1, strInputFile.lastIndexOf("."));
fileSeekStream = new FileSeekableStream(strInputFile);
ImageDecoder imageDecoder = ImageCodec.createImageDecoder("TIFF", fileSeekStream, null);
int intTifCount = imageDecoder.getNumPages();
logger.info("该tif文件共有【" + intTifCount + "】页");
String strJpgPath = "";
String strJpgUrl = "";
if (intTifCount == 1) {
// 如果是单页tif文件，则转换的目标文件夹就在指定的位置
strJpgPath = strOutputFile.substring(0, strOutputFile.lastIndexOf("/"));
} else {
// 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
strJpgPath = strOutputFile.substring(0, strOutputFile.lastIndexOf("."));
}
// 处理目标文件夹，如果不存在则自动创建
File fileJpgPath = new File(strJpgPath);
if (!fileJpgPath.exists()) {
fileJpgPath.mkdirs();
}
File fileJpg=new File(strOutputFile);
OutputStream ops = new FileOutputStream(fileJpg);
// 文件存储输出流
JPEGEncodeParam param = new JPEGEncodeParam();
ImageEncoder image = ImageCodec.createImageEncoder("JPEG", ops,
param); // 指定输出格式
// 解析输出流进行输出
image.encode(roInput);
// 关闭流
ops.close();
// 循环，处理每页tif文件，转换为jpg
for (int i = 0; i < intTifCount; i++) {
String strJpg = "";
if(intTifCount == 1){
strJpg = strJpgPath + "/" + strFilePrefix + ".jpg";
strJpgUrl = strFilePrefix + ".jpg";
}else{
strJpg = strJpgPath + "/" + i + ".jpg";
strJpgUrl = strFilePrefix + "/" + i + ".jpg";
}
return fileJpg;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (Exception e) {
File fileJpg = new File(strJpg);
// 如果文件不存在，则生成
if(!fileJpg.exists()){
RenderedImage renderedImage = imageDecoder.decodeAsRenderedImage(i);
ParameterBlock pb = new ParameterBlock();
pb.addSource(renderedImage);
pb.add(fileJpg.toString());
pb.add("JPEG");
pb.add(jpegEncodeParam);
RenderedOp renderedOp = JAI.create("filestore", pb);
renderedOp.dispose();
logger.info("每页分别保存至： " + fileJpg.getCanonicalPath());
}else{
logger.info("JPG文件已存在： " + fileJpg.getCanonicalPath());
}
listImageFiles.add(strJpgUrl);
}
return listImageFiles;
} catch (IOException e) {
e.printStackTrace();
return null;
} finally {
if (fileSeekStream != null) {
try {
fileSeekStream.close();
} catch (IOException e) {
}
fileSeekStream = null;
}
}
return null;
}
/**
* 将Jpg图片转换为Pdf文件
*
* @param strJpgFile 输入的jpg的路径和文件名
* @param strPdfFile 输出的pdf的路径和文件名
* @return
@ -61,7 +135,8 @@ public class ConvertPicUtil {
public static File convertJpg2Pdf(String strJpgFile, String strPdfFile) {
Document document = new Document();
// 设置文档页边距
document.setMargins(0,0,0,0);
document.setMargins(0, 0, 0, 0);
FileOutputStream fos = null;
try {
fos = new FileOutputStream(strPdfFile);
@ -70,8 +145,8 @@ public class ConvertPicUtil {
document.open();
// 获取图片的宽高
Image image = Image.getInstance(strJpgFile);
float floatImageHeight=image.getScaledHeight();
float floatImageWidth=image.getScaledWidth();
float floatImageHeight = image.getScaledHeight();
float floatImageWidth = image.getScaledWidth();
// 设置页面宽高与图片一致
Rectangle rectangle = new Rectangle(floatImageWidth, floatImageHeight);
document.setPageSize(rectangle);
@ -101,5 +176,62 @@ public class ConvertPicUtil {
return null;
}
}
/**
* 将Tif图片转换为Pdf文件（支持多页Tif）
*
* @param strTifFile 输入的tif的路径和文件名
* @param strPdfFile 输出的pdf的路径和文件名
* @return
*/
public static File convertTif2Pdf(String strTifFile, String strPdfFile) {
try {
RandomAccessFileOrArray rafa = new RandomAccessFileOrArray(strTifFile);
Document document = new Document();
// 设置文档页边距
document.setMargins(0, 0, 0, 0);
PdfWriter.getInstance(document, new FileOutputStream(strPdfFile));
document.open();
int intPages = TiffImage.getNumberOfPages(rafa);
Image image;
File filePDF;
if(intPages == 1){
String strJpg = strTifFile.substring(0, strTifFile.lastIndexOf(".")) + ".jpg";
File fileJpg = new File(strJpg);
List<String> listPic2Jpg = convertTif2Jpg(strTifFile, strJpg);
if(listPic2Jpg != null && fileJpg.exists()){
filePDF = convertJpg2Pdf(strJpg, strPdfFile);
}
}else{
for (int i = 1; i <= intPages; i++) {
image = TiffImage.getTiffImage(rafa, i);
// 设置页面宽高与图片一致
Rectangle pageSize = new Rectangle(image.getScaledWidth(), image.getScaledHeight());
document.setPageSize(pageSize);
// 图片居中
image.setAlignment(Image.ALIGN_CENTER);
//新建一页添加图片
document.newPage();
document.add(image);
}
document.close();
}
rafa.close();
filePDF = new File(strPdfFile);
return filePDF;
} catch (Exception e) {
System.out.println(e.toString());
}
return null;
}
}