Java上传下载文件并实现加密解密

使用 Jersey 服务器实现上传，使用 HTTP 请求实现下载

引入依赖

在 pom.xml 中添加 Jersey 相关依赖

<dependency> <groupId>com.sun.jersey</groupId> <artifactId>jersey-client</artifactId> <version>1.18.1</version></dependency>

创建工具类

import com.sun.jersey.api.client.Client;import com.sun.jersey.api.client.ClientHandlerException;import com.sun.jersey.api.client.UniformInterfaceException;import com.sun.jersey.api.client.WebResource;import org.springframework.web.context.request.RequestContextHolder;import org.springframework.web.context.request.ServletRequestAttributes;import org.springframework.web.multipart.MultipartFile;import javax.servlet.http.HttpServletRequest;import java.io.*;import java.net.HttpURLConnection;import java.net.URL;import java.util.UUID;public class FileUtils { // 加密/解密文件的密钥 public static final int CRYPTO_SECRET_KEY = 0x99; public static int FILE_DATA = 0; /** * 加密/解密 文件 * @param srcFile 原文件 * @param encFile 加密/解密后的文件 * @throws Exception */ public static void cryptoFile(File srcFile, File encFile) throws Exception { InputStream inputStream = new FileInputStream(srcFile); OutputStream outputStream = new FileOutputStream(encFile); while ((FILE_DATA = inputStream.read()) > -1) { outputStream.write(FILE_DATA ^ CRYPTO_SECRET_KEY); } inputStream.close(); outputStream.flush(); outputStream.close(); } /** * MultipartFile 生成临时文件 * @param multipartFile * @param tempFilePath 临时文件路径 * @return File 临时文件 */ public static File multipartFileToFile(MultipartFile multipartFile, String tempFilePath) { File file = new File(tempFilePath); // 获取文件原名 String originalFilename = multipartFile.getOriginalFilename(); // 获取文件后缀 String suffix = originalFilename.substring(originalFilename.lastIndexOf('.')); if (!file.exists()) { file.mkdirs(); } // 创建临时文件 File tempFile = new File(tempFilePath + '' + UUID.randomUUID().toString().replaceAll('-', '') + suffix); try { if (!tempFile.exists()) {// 写入临时文件multipartFile.transferTo(tempFile); } } catch (IOException e) { e.printStackTrace(); } return tempFile; } /** * 上传文件 * @param fileServerPath文件服务器地址 * @param folderPath 存放的文件夹路径（比如存放在文件服务器的 upload 文件夹下，即 ”/upload“） * @param uploadFile需要上传的文件 * @param isCrypto是否加密 * @return String文件上传后的全路径 */ public static String uploadByJersey(String fileServerPath, String folderPath, File uploadFile, boolean isCrypto) { String suffix = uploadFile.getName().substring(uploadFile.getName().lastIndexOf('.')); String randomFileName = UUID.randomUUID().toString().replaceAll('-', '') + suffix; String fullPath = fileServerPath + folderPath + '/' + randomFileName; try { if (isCrypto) {// 创建加密文件File cryptoFile = new File(uploadFile.getPath().substring(0, uploadFile.getPath().lastIndexOf('.')) + 'crypto' + uploadFile.getPath().substring(uploadFile.getPath().lastIndexOf('.')));// 执行加密cryptoFile(uploadFile, cryptoFile);// 保存加密后的文件uploadFile = cryptoFile; } // 创建 Jersey 服务器 Client client = Client.create(); WebResource wr = client.resource(fullPath); // 上传文件 wr.put(String.class, fileToByte(uploadFile)); } catch (Exception e) { e.printStackTrace(); } return fullPath; } /** * 下载文件 * @param url 文件路径 * @param filePath 文件保存路径 * @param fileName文件名称（包含文件后缀） * @param isCrypto 是否解密 * @return File */ public static File downloadByURL(String url, String filePath, String fileName, boolean isCrypto) { File file = new File(filePath); if (!file.exists()) { file.mkdirs(); } FileOutputStream fileOut; HttpURLConnection httpURLConnection; InputStream inputStream; try { URL httpUrl = new URL(url); httpURLConnection = (HttpURLConnection) httpUrl.openConnection(); httpURLConnection.setDoInput(true); httpURLConnection.setDoOutput(true); httpURLConnection.setUseCaches(false); httpURLConnection.connect(); inputStream = httpURLConnection.getInputStream(); BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream); if (!filePath.endsWith('')) {filePath += ''; } file = new File(filePath + fileName); fileOut = new FileOutputStream(file); BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(fileOut); byte[] bytes = new byte[4096]; int length = bufferedInputStream.read(bytes); //保存文件 while (length != -1) {bufferedOutputStream.write(bytes, 0, length);length = bufferedInputStream.read(bytes); } bufferedOutputStream.close(); bufferedInputStream.close(); httpURLConnection.disconnect(); } catch (Exception e) { e.printStackTrace(); } if (isCrypto) { try {// 创建解密文件File cryptoFile = new File(((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest().getServletContext().getRealPath('/') + 'temp' + UUID.randomUUID().toString().replaceAll('-', '') + file.getName().substring(file.getName().lastIndexOf('.')));// 执行解密cryptoFile(file, cryptoFile);// 删除下载的原文件file.delete();// 保存解密后的文件file = cryptoFile; } catch (Exception e) {e.printStackTrace(); } } return file; } /** * 删除文件服务器上的文件 * @param url 文件路径 * @return boolean */ public static boolean deleteByJersey(String url) { try { Client client = new Client(); WebResource webResource = client.resource(url); webResource.delete(); return true; } catch (UniformInterfaceException e) { e.printStackTrace(); } catch (ClientHandlerException e) { e.printStackTrace(); } return false; } /** * File转Bytes * @param file * @return byte[] */ public static byte[] fileToByte(File file) { byte[] buffer = null; try { FileInputStream fileInputStream = new FileInputStream(file); ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); byte[] bytes = new byte[1024]; int n; while ((n = fileInputStream.read(bytes)) != -1) {byteArrayOutputStream.write(bytes, 0, n); } fileInputStream.close(); byteArrayOutputStream.close(); buffer = byteArrayOutputStream.toByteArray(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return buffer; }}

测试上传

/** * @param multipartFile 上传文件 * @param isCrypto 是否加密文件 * @return */@Testpublic String upload(MultipartFile multipartFile, boolean isCrypto) { HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest(); // 生成临时文件 File tempFile = FileUtil.multipartFileToFile(multipartFile, request.getServletContext().getRealPath('/') + 'statictemp'); // 上传文件并返回文件路径 String uploadFilePath = FileUtil.uploadByJersey('http://localhost:8080', '/upload', tempFile, isCrypto); if (uploadFilePath != null) { return '上传成功'; } else { return '上传失败'; }}

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