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260 lines
9.0 KiB
260 lines
9.0 KiB
3 years ago
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package com.ynxbd.common.helper.common;
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import org.apache.pdfbox.pdmodel.PDDocument;
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import org.apache.pdfbox.rendering.ImageType;
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import org.apache.pdfbox.rendering.PDFRenderer;
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import javax.imageio.ImageIO;
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import java.awt.image.BufferedImage;
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import java.io.ByteArrayOutputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.nio.charset.StandardCharsets;
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import java.util.Base64;
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import java.util.UUID;
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/**
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* @Author wsq
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* @Date 2020/8/3 15:37
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* @Copyright @ 2020 云南新八达科技有限公司 All rights reserved.
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*/
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public class Base64Helper {
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/**
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* BASE64解密
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*
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* @param data data
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* @return 解密后的内容
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*/
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public static String decode(String data) {
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return new String(java.util.Base64.getDecoder().decode(data), StandardCharsets.UTF_8); //
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}
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/**
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* BASE64解密
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*
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* @param data 解密
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* @return 解密后的内容
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*/
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public static byte[] decodeByte(String data) {
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try {
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return java.util.Base64.getDecoder().decode(data);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* BASE64加密
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*
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* @param data 需要加密的字符串
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* @return 加密后的字符串
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*/
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public static String encode(String data) {
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return java.util.Base64.getEncoder().encodeToString(data.getBytes(StandardCharsets.UTF_8));
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}
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/**
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* BASE64加密
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*
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* @param obj 需要加密的字符串
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* @return 加密后的字符串
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*/
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public static String encode(Object obj, Boolean isEncryption) {
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if (obj == null) return null;
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String encode;
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if (obj.getClass() != String.class) {
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encode = JsonHelper.toJsonString(obj);
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} else {
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encode = obj.toString();
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}
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if ("".equals(encode)) {
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return null;
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}
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encode = java.util.Base64.getEncoder().encodeToString(encode.getBytes(StandardCharsets.UTF_8));
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if (isEncryption) {
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String uuid = UUID.randomUUID().toString().replace("-", "");
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if (encode.length() > 25) {
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String begStr = encode.substring(0, 10);
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String endStr = encode.substring(encode.length() - 15, encode.length() - 5);
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String end = encode.substring(encode.length() - 5);
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String middle = encode.substring(10, encode.length() - 15);
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return uuid + endStr + middle + begStr + end;
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} else {
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encode = uuid + encode;
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}
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}
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return encode;
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}
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// 判断是否只有数字和字母
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public static boolean isLetterDigit(String str) {
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return str.matches("^[a-z0-9A-Z]+$");
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}
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/**
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* 解密
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*
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* @param data 需要解密的字符串
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*/
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public static String decodeEn(String data) {
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try {
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if (data == null) {
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return null;
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}
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int dataLen = data.length();
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if (dataLen > 32) { // 截取掉uuid
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data = data.substring(32);
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}
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if (dataLen > 57) { // 超过57位的需要调换前后位置
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String endStr = data.substring(0, 10);
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String begStr = data.substring(data.length() - 15, data.length() - 5);
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String middle = data.substring(10, data.length() - 15);
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String end = data.substring(data.length() - 5);
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data = begStr + middle + endStr + end;
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}
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String deData = new String(Base64.getDecoder().decode(data), StandardCharsets.UTF_8);// base64解密
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if (!isLetterDigit(deData)) {
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return null;
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}
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return deData;
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} catch (Exception e) {
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return null;
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}
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}
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/**
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* 将图片转换成Base64编码
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*
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* @param imgFile 图片文件
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* @return base64
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*/
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public static String imageToBase(File imgFile) {
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try (FileInputStream fis = new FileInputStream(imgFile)) {
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byte[] buffer = new byte[(int) imgFile.length()];
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fis.read(buffer);
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return java.util.Base64.getEncoder().encodeToString(buffer);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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public static String pdfBaseToImgBase(String base64) {
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return pdfBaseToImgBase(base64, null);
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}
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public static String pdfBaseToImgBase(String base64, Integer dpi) {
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if (base64 == null) {
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return null;
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}
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String imgBase64;
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PDDocument pdDoc = null;
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ByteArrayOutputStream bos = null;
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if (dpi == null) {
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dpi = 100;
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}
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try {
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// Base64解码
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byte[] pdfBytes = java.util.Base64.getDecoder().decode(base64);
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pdDoc = PDDocument.load(pdfBytes);
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int size = pdDoc.getNumberOfPages();
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/*图像合并使用的参数*/
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int width = 0;
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int height = 0;
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// 保存一张图片中的RGB数据
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int[] singleImgRGB;
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//保存每张图片的像素值
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BufferedImage imageResult = null;
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// 利用PdfBox生成图像
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PDFRenderer renderer = new PDFRenderer(pdDoc);
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/* 根据总页数, 按照50页生成一张长图片的逻辑, 进行拆分--每50页转成1张图片--总计循环的次数 */
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BufferedImage image;
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int imageHeight, imageWidth, pageIndex;
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int totalCount = pdDoc.getNumberOfPages() / size + 1;
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for (int m = 0; m < totalCount; m++) {
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for (int i = 0; i < size; i++) {
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pageIndex = i + (m * size);
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if (pageIndex == pdDoc.getNumberOfPages()) {
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break;
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}
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// 96为图片的dpi，dpi越大，则图片越清晰，图片越大，转换耗费的时间也越多
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image = renderer.renderImageWithDPI(pageIndex, dpi, ImageType.RGB);
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imageHeight = image.getHeight();
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imageWidth = image.getWidth();
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if (i == 0) {
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// 计算高度和偏移量 使用第一张图片宽度;
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width = imageWidth;
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// 保存每页图片的像素值
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// 加个判断：如果m次循环后所剩的图片总数小于pageLength，则图片高度按剩余的张数绘制，否则会出现长图片下面全是黑色的情况
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if ((pdDoc.getNumberOfPages() - m * size) < size) {
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imageResult = new BufferedImage(width, imageHeight * (pdDoc.getNumberOfPages() - m * size), BufferedImage.TYPE_INT_RGB);
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} else {
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imageResult = new BufferedImage(width, imageHeight * size, BufferedImage.TYPE_INT_RGB);
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}
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} else {
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// 将高度不断累加
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height += imageHeight;
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}
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singleImgRGB = image.getRGB(0, 0, width, imageHeight, null, 0, width);
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imageResult.setRGB(0, height, width, imageHeight, singleImgRGB, 0, width);
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}
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// 这个很重要，下面会有说明
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height = 0;
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}
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if (imageResult == null) {
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return null;
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}
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bos = new ByteArrayOutputStream();//io流
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ImageIO.write(imageResult, "png", bos);//写入流中
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imgBase64 = java.util.Base64.getEncoder().encodeToString(bos.toByteArray()).trim();
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imgBase64 = "data:image/png;base64," + imgBase64.replaceAll("\n", "").replaceAll("\r", ""); //删除 \r\n
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return imgBase64;
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} catch (IOException e) {
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e.printStackTrace();
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} finally {
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try {
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if (bos != null) {
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bos.flush();
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bos.close();
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}
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if (pdDoc != null) {
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pdDoc.close();
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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return null;
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}
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// public static void main(String[] args) {
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// String a = encode("123456789011121314151123123", true);
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// System.out.println(a);
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// String s = decodeEn(a);
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// System.out.println(s);
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// }
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// public static void main(String[] args) {
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// String encode = CodeHelper.get28UUID() + encode(JsonHelper.toJsonString(new ArrayList<>()));
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// System.out.println(encode);
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// }
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public static void main(String[] args) {
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}
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}
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