图片Base64列表转PDFBase64

最近接到一个需求，要求多张图片合并成一个PDF并且以Base64当出入参，来直接上干货。

需要用到的包：

        <dependency>
			<groupId></groupId>
			<artifactId>itextpdf</artifactId>
			<version>5.4.2</version>
		</dependency>
        <!-- hutool测试用 -->
        <dependency>
            <groupId></groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.8.5</version>
        </dependency>

代码：

    /**
	 * 图片转pdf
	 * @param imgStrList 图片base64
	 * @param target
	 */
	public static String ImgChangePDF(List<String> imgStrList, String target) {
		String result = "";
		//创建一个文档对象
		Document doc = new Document();
		try {
			//定义输出文件的位置
			(doc, new FileOutputStream(target));
			//开启文档
			();
			// 循环获取图片文件夹内的图片
			for (String imgStr : imgStrList) {
				if(imgStr == null) {
					continue;
				}
				//路径
				MultipartFile multipartFile = base64MultipartFile(imgStr);
				Image  img = (());
				//获得宽高
				Float h = ();
				Float w = ();
				//统一压缩
				Integer percent = getPercent(h, w);
				//图片居中
				();
				//百分比显示图
				(percent);
				//设置高和宽的比例
				(img);
			}
			// 关闭文档
			if(doc != null){
				();
			}
			//转Base64
			File pdfFile = new File(target);
			FileInputStream fileInputStream = new FileInputStream(pdfFile);
			byte[] byteBuff = new byte[(int) ()];
			(byteBuff);
			();
			result =  new BASE64Encoder().encode(byteBuff);
			if(pdfFile!=null){
				();
			}
		} catch (IOException e) {
			();
		} catch (BadElementException e) {
			();
		} catch (DocumentException e) {
			();
		}
		return result;
	}

	/**
	 * 压缩
	 * @param h
	 * @param w
	 * @return
	 */
	public static Integer getPercent(Float h,Float w) {
		Integer g = 0;
		Float g2 = 0.0f;
		g2 = 480 / w * 100;
		g = (g2);
		return g;
	}

    public static MultipartFile base64MultipartFile(String base64) {
		try {
			String[] baseStr = (",");
			BASE64Decoder base64Decoder = new BASE64Decoder();
			byte[] b;
			b = (baseStr[0]);
			for (int i = 0; i < ; ++i) {
				if (b[i] < 0) {
					b[i] += 256;
				}
			}
			return new BASE64DecodedMultipartFile(b, baseStr[0]);
		} catch (Exception e) {
			();
			return null;
		}
	}


	public static void main(String[] args) throws Exception{

		List<String> source = new ArrayList<String>();
        //这里我把图片base64存txt里面了，具体你们自己改
		(new ("F://").readString());
		(new ("F://").readString());
		String str = ImgChangePDF(source, ()+".pdf");
		(str);


	}