正文
Base64转PDF、PDF转IMG（使用pdfbox插件）
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--添加依赖
<!-- https://mvnrepository.com/artifact/org.apache.pdfbox/pdfbox -->
<dependency>
<groupId>org.apache.pdfbox</groupId>
<artifactId>pdfbox</artifactId>
<version>2.0.12</version>
</dependency>
--最佳实践
package com.dhht.wechat.util;
import org.apache.commons.io.FileUtils;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPageTree;
import org.apache.pdfbox.rendering.PDFRenderer;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.*;
/**
* @Author: sh
* @Description: PDFUtil
* @Date: 11:35 2019/7/1
*/
public class PDFUtil {
/**
* 将base64字符串转换为PDF在显示到页面中
* @param base64String
* @param httpServletResponse
*/
public static void base64StringToPDFToPage(String base64String, HttpServletResponse httpServletResponse){
BASE64Decoder decoder = new BASE64Decoder();
ByteArrayOutputStream baos = null;
ServletOutputStream sos = null;
try {
byte[] bytes = decoder.decodeBuffer(base64String);
baos = new ByteArrayOutputStream();
baos.write(bytes); //把byte写进输出流里
if (baos != null) {
httpServletResponse.setContentType("application/pdf");
httpServletResponse.setContentLength(baos.size());
httpServletResponse.setHeader("Expires", "0");
httpServletResponse.setHeader("Cache-Control", "must-revalidate, post-check=0, pre-check=0");
httpServletResponse.setHeader("Pragma", "public");
// 设置打印PDF的文件名
String fileName = "社保证明文件.pdf";
fileName = new String(fileName.getBytes("UTF-8"), "ISO-8859-1");
httpServletResponse.setHeader("Content-Disposition", "filename=" + fileName);
sos = httpServletResponse.getOutputStream();
baos.writeTo(sos); //byte输出流写入servlet输出流
sos.flush();
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
sos.close();
baos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 将base64编码转换成PDF
* @param base64String
* 1.使用BASE64Decoder对编码的字符串解码成字节数组
* 2.使用底层输入流ByteArrayInputStream对象从字节数组中获取数据；
* 3.建立从底层输入流中读取数据的BufferedInputStream缓冲输出流对象；
* 4.使用BufferedOutputStream和FileOutputSteam输出数据到指定的文件中
*/
public static void base64StringToPDF(String base64String, String pdfPath/*File file*/){
File file = new File(pdfPath);// 将原来参数修改为字符串
BASE64Decoder decoder = new BASE64Decoder();
BufferedInputStream bin = null;
FileOutputStream fout = null;
BufferedOutputStream bout = null;
try {
//将base64编码的字符串解码成字节数组
byte[] bytes = decoder.decodeBuffer(base64String);
//创建一个将bytes作为其缓冲区的ByteArrayInputStream对象
ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
//创建从底层输入流中读取数据的缓冲输入流对象
bin = new BufferedInputStream(bais);
//创建到指定文件的输出流
fout = new FileOutputStream(file);
//为文件输出流对接缓冲输出流对象
bout = new BufferedOutputStream(fout);
byte[] buffers = new byte[1024];
int len = bin.read(buffers);
while(len != -1){
bout.write(buffers, 0, len);
len = bin.read(buffers);
}
//刷新此输出流并强制写出所有缓冲的输出字节，必须这行代码，否则有可能有问题
bout.flush();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
bout.close();
fout.close();
bin.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* PDF转换为Base64编码
* @param file
* @return
*/
public static String pdfToBase64(File file) {
BASE64Encoder encoder = new BASE64Encoder();
FileInputStream fin =null;
BufferedInputStream bin =null;
ByteArrayOutputStream baos = null;
BufferedOutputStream bout =null;
try {
fin = new FileInputStream(file);
bin = new BufferedInputStream(fin);
baos = new ByteArrayOutputStream();
bout = new BufferedOutputStream(baos);
byte[] buffer = new byte[1024];
int len = bin.read(buffer);
while(len != -1){
bout.write(buffer, 0, len);
len = bin.read(buffer);
}
//刷新此输出流并强制写出所有缓冲的输出字节
bout.flush();
byte[] bytes = baos.toByteArray();
return encoder.encodeBuffer(bytes).trim();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
fin.close();
bin.close();
baos.close();
bout.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
/**
* pdf转jpg
* @param pdfPath
* @param jpgPath
*/
public static void pdfToJpg(String pdfPath,String jpgPath){
long start = System.currentTimeMillis();
//pdf路径
InputStream stream = null;
try {
stream = new FileInputStream(new File(pdfPath));//URLUtil.getStream(url);
// 加载解析PDF文件
PDDocument doc = PDDocument.load(stream);
PDFRenderer pdfRenderer = new PDFRenderer(doc);
PDPageTree pages = doc.getPages();
int pageCount = pages.getCount();
for (int i = 0; i < pageCount; i++) {
BufferedImage bim = pdfRenderer.renderImageWithDPI(i, 200);
ByteArrayOutputStream os = new ByteArrayOutputStream();
ImageIO.write(bim, "jpg", os);
byte[] datas = os.toByteArray();
FileUtils.writeByteArrayToFile(new File(jpgPath),datas);
}
long end = System.currentTimeMillis();
long time = (end - start) / 1000;
System.out.println("pdf转jpg耗时： {}s"+time);
}catch (Exception e){
}
}
/**
* base64转jpg
* @param val
* @param pdfFile
* @param jpgFile
*/
public static void base64ToJPG(String val,String pdfFile,String jpgFile){
base64StringToPDF(val,pdfFile);
pdfToJpg(pdfFile,jpgFile);
}
}
