Springboot使用pdfbox提取PDF图片

package com.zhouquan.utils; import org.apache.commons.io.IOUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import javax.servlet.http.HttpServletRequest; import java.io.*; import java.net.URLEncoder; import java.nio.charset.StandardCharsets; /** * 文件处理工具类 */ public class FileUtils { private static final Logger log = LoggerFactory.getLogger(FileUtils.class); public static String FILENAME_PATTERN = "[a-zA-Z0-9_\\-\\|\\.\\u4e00-\\u9fa5]+"; private static final String[] IEBrowserSignals = {"MSIE", "Trident", "Edge"}; /** * 输出指定文件的byte数组 * * @param filePath 文件路径 * @param os 输出流 * @return */ public static void writeBytes(String filePath, OutputStream os) throws IOException { FileInputStream fis = null; try { File file = new File(filePath); if (!file.exists()) { throw new FileNotFoundException(filePath); } fis = new FileInputStream(file); byte[] b = new byte[1024]; int length; while ((length = fis.read(b)) > 0) { os.write(b, 0, length); } } catch (IOException e) { throw e; } finally { IOUtils.close(os); IOUtils.close(fis); } } /** * 删除文件 * * @param filePath 文件 * @return */ public static boolean deleteFile(String filePath) { boolean flag = false; File file = new File(filePath); // 路径为文件且不为空则进行删除 if (file.isFile() && file.exists()) { file.delete(); flag = true; } return flag; } /** * 文件名称验证 * * @param filename 文件名称 * @return true 正常 false 非法 */ public static boolean isValidFilename(String filename) { return filename.matches(FILENAME_PATTERN); } /** * 下载文件名重新编码 * * @param request 请求对象 * @param fileName 文件名 * @return 编码后的文件名 */ public static String setFileDownloadHeader(HttpServletRequest request, String fileName) throws UnsupportedEncodingException { final String agent = request.getHeader("USER-AGENT"); String filename = fileName; if (agent.contains("MSIE")) { // IE浏览器 filename = URLEncoder.encode(filename, "utf-8"); filename = filename.replace("+", " "); } else if (agent.contains("Firefox")) { // 火狐浏览器 filename = new String(fileName.getBytes(), "ISO8859-1"); } else if (agent.contains("Chrome")) { // google浏览器 filename = URLEncoder.encode(filename, "utf-8"); } else { // 其它浏览器 filename = URLEncoder.encode(filename, "utf-8"); } return filename; } /** * 百分号编码工具方法 * * @param s 需要百分号编码的字符串 * @return 百分号编码后的字符串 */ public static String percentEncode(String s) throws UnsupportedEncodingException { String encode = URLEncoder.encode(s, StandardCharsets.UTF_8.toString()); return encode.replaceAll("\\+", "%20"); } /** * 获取图像后缀 * * @param photoByte 图像数据 * @return 后缀名 */ public static String getFileExtendName(byte[] photoByte) { String strFileExtendName = "jpg"; if ((photoByte[0] == 71) && (photoByte[1] == 73) && (photoByte[2] == 70) && (photoByte[3] == 56) && ((photoByte[4] == 55) || (photoByte[4] == 57)) && (photoByte[5] == 97)) { strFileExtendName = "gif"; } else if ((photoByte[6] == 74) && (photoByte[7] == 70) && (photoByte[8] == 73) && (photoByte[9] == 70)) { strFileExtendName = "jpg"; } else if ((photoByte[0] == 66) && (photoByte[1] == 77)) { strFileExtendName = "bmp"; } else if ((photoByte[1] == 80) && (photoByte[2] == 78) && (photoByte[3] == 71)) { strFileExtendName = "png"; } return strFileExtendName; } }